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Non-isothermal thermal decomposition kinetics of high iron gibbsite ore based on Popescu method 被引量:2
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作者 柳政根 王峥 +2 位作者 唐珏 王宏涛 龙红明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2415-2421,共7页
The thermal decomposition kinetics of high iron gibbsite ore was investigated under non-isothermal conditions.Popescu method was applied to analyzing the thermal decomposition mechanism.The results show that the most ... The thermal decomposition kinetics of high iron gibbsite ore was investigated under non-isothermal conditions.Popescu method was applied to analyzing the thermal decomposition mechanism.The results show that the most probable thermal decomposition mechanism is the three-dimensional diffusion model of Jander equation,and the mechanism code is D3.The activation energy and pre-exponential factor for thermal decomposition of high iron gibbsite ore calculated by the Popescu method are 75.36 kJ/mol and 1.51×10-5 s-(-1),respectively.The correctness of the obtained mechanism function is validated by the activation energy acquired by the iso-conversional method.Popescu method is a rational and reliable method for the analysis of the thermal decomposition mechanism of high iron gibbsite ore. 展开更多
关键词 high iron gibbsite ore thermal decomposition kinetics activation energy pre-exponential factor Popescu method
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Kinetics and Mechanism of Decomposition of Nano-sized Calcium Carbonate under Non-isothermal Condition 被引量:7
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作者 刘润静 陈建峰 +2 位作者 郭奋 吉米 沈志刚 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第3期302-306,共5页
Experiments on thermal decomposition of nano-sized calcium carbonate were carried out in a thermo-gravimetric analyzer under non-isothermal condition of different heating rates (5 to 20K·min-1). The Coats and Red... Experiments on thermal decomposition of nano-sized calcium carbonate were carried out in a thermo-gravimetric analyzer under non-isothermal condition of different heating rates (5 to 20K·min-1). The Coats and Redfern's equation was used to determine the apparent activation energy and the pre-exponential factors. The mechanism of thermal decomposition was evaluated using the master plots, Coats and Redfern's equation and the kinetic compensation law. It was found that the thermal decomposition property of nano-sized calcium carbonate was different from that of bulk calcite. Nano-sized calcium carbonate began to decompose at 640℃, which was 180℃lower than the reported value for calcite. The experimental results of kinetics were compatible with the mechanism of one-dimensional phase boundary movement. The apparent activation energy of nano-sized calcium carbonate was estimated to be 151kJ·mol-1 while the literature value for normal calcite was approximately 200kJ·mol-1. The order of magnitude of pre-exponential factors was estimated to be 10~9 s-1. 展开更多
关键词 nano-sized calcium carbonate non-isothermal decomposition kinetic mechanism
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Kinetics Study on the Thermal Decomposition of Europium p-methyl-benzoate Complex with 1,10-penanthroline under Non-isothermal Con-ditions 被引量:3
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作者 Huifang Yang, Jianjun Zhang, Ruifen Wang (Department of Material, Shjiazhuang Railway College, Shijiazhuang 050043, China Experimental Center, Hebei Normal University, Shijiazhuang 050016, China) 《Rare Metals》 SCIE EI CAS CSCD 2001年第2期133-136,共4页
The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition pro... The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(alpha) =(1-alpha)(2), g(alpha) = (1-alpha)(-1)-1. The activation energy for the first stage is 255.18 kJ/mol, the entropy of activation DeltaS is 227.32 J/mol and the Gibbs free energy of activation DeltaG is 128.04 W/mol. 展开更多
关键词 thermal decomposition non-isothermal kinetics MECHANISMS Eu(III) complex
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Study on Non-Isothermal Decomposition Kinetics of Ephedrini Hydrochloridum 被引量:3
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作者 TangWan-jun ChenDong-hua ShengYu-fang 《Wuhan University Journal of Natural Sciences》 CAS 2003年第02A期443-446,共4页
The thermal decomposition processes of ephedrini hydrochloridum and its kinetics are studied by TG-DTG techniques. A combined method, which includes Achar method, Coats-Redfera method, and Ozawa method, is put forward... The thermal decomposition processes of ephedrini hydrochloridum and its kinetics are studied by TG-DTG techniques. A combined method, which includes Achar method, Coats-Redfera method, and Ozawa method, is put forward for determining kinetic model under non-isothermal conditions. By applying the combined method, it is determined that the thermal decomposition of ephedrini hydrochloridum is subjected to cylindrical symmetric diffusion. And the reaction function is&#402;(&#945;)=2(1-&#945;)?, apparent activation energy (115.26±3.55) kJ·mol&#8722;1, pre-exponential factor 4.62×108 s&#8722;1. Results show that the combined method is feasible and simple. 展开更多
关键词 Key Words ephedrini hydrochloridum TG DTG technique non isothermal kinetics combined method thermal decomposition
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Non-isothermal Decomposition Mechanism and Kinetics of LiClO_4 in Nitrogen 被引量:3
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作者 DIAKITE Kahirou 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第2期300-303,共4页
The non-isothermal decomposition kinetics of LiClO4 in flow N2 atmosphere was studied. TG-DTA curves show that the decomposition proceeded through two well-defined steps below 900℃, and the mass loss was in agreement... The non-isothermal decomposition kinetics of LiClO4 in flow N2 atmosphere was studied. TG-DTA curves show that the decomposition proceeded through two well-defined steps below 900℃, and the mass loss was in agreement with the theoretical value. XRD profile demonstrates that the product of the thermal decomposition at 500℃ is LiCI. For the decomposition kinetics study, the activation energies calculated with the Friedman method were considered as the initial values for non-linear regression and were used for verifying the correctness of the fired models. The decomposition process was fitted by a two-step consecutive reaction: extended Prout-Tompkins equation[Bna, f(α) is (1-α)^nα^α] followed by a lth order reaction(F1). The activation energies were (215.6±0.2) and (251.6±3.6) kJ/mol, respectively. The exponentials n and a for Bna reaction were (0.25±0.05) and (0.795±0.005), respectively. The reaction types and activation energies were in agreement with those obtained from the isothermal method, but the exponentials were optimized for better firing and prediction. 展开更多
关键词 LICLO4 decomposition mechanism non-isothermal kinetics Non-linear regression
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Thermal Behavior, Non-isothermal Decomposition Reaction Kinetics of Copper(Ⅱ) Salt of 4-Hydroxy-3,5-dinitropyridine and Its Application in Propellant 被引量:2
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作者 CHENPei ZHAOFeng-qi +5 位作者 LUOyang HURong-zu GAOSheng-li ZHENGYu-mei DENGMin-zhi GAOYin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第1期100-103,共4页
The thermal behavior and kinetic parameters of the major exothermic decomposition reaction of the title compound in a temperature-programmed mode were studied by means of TG-DTG and DSC. The critical temperature of th... The thermal behavior and kinetic parameters of the major exothermic decomposition reaction of the title compound in a temperature-programmed mode were studied by means of TG-DTG and DSC. The critical temperature of thermal explosion was calculated. The effect of the title compound on the combustion characteristic of composition modifier double base propellant containing RDX was explored with a strand burner. The results show that the kinetic model function in differential forms, the apparent activation energy(E a) and the pre-exponential factor(A) of the major exothermic decomposition reaction are 3(1-α)[-ln(1-α)] 2/3, 190.56 kJ/mol and 10 13.39 s -1, respectively. The critical temperature of thermal explosion of the compound is 353.08 ℃. The kinetic equation of the major exothermic decomposition process of the title compound at 0.1 MPa could be expressed as dα/dT=10 14.65(1-α)[-ln(1-α)] 2/3 e -2.2920×104/T. As an auxiliary catalyzer, the title compound can help the main catalyzer of lead salt of 4-hydroxy-3,5-dinitropyridine to accelerate the burning rate and reduce the pressure exponent of RDX-CMDB propellant. 展开更多
关键词 thermal behavior decomposition kinetics Copper(Ⅱ) salt of 4-hydroxy-3 5-dinitropyridine Application PROPELLANT
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Thermal decomposition mechanism and non-isothermal kinetics of the polyoxometalate of ciprofloxacin with 12-tungstoboric acid 被引量:1
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作者 WANGDunjia FANGZhengdong HANDeyan 《Rare Metals》 SCIE EI CAS CSCD 2005年第1期15-21,共7页
The polyoxometalate complex (CPFX-HCl)(4)H5BW12O40-12H(2)O was prepared in aqueous solution for the first time, and characterized by elemental analysis, IR spectrum, and TG-DTG. The TG-DTG curves showed that its therm... The polyoxometalate complex (CPFX-HCl)(4)H5BW12O40-12H(2)O was prepared in aqueous solution for the first time, and characterized by elemental analysis, IR spectrum, and TG-DTG. The TG-DTG curves showed that its thermal decomposition was a four-step process consisting of the simultaneous collapse of Keggin anion. The intermediate and residue of the decomposition were identified by mean of TG-DTG, IR, and XRD technique. The non-isothermal kinetic data were analyzed by the Achar method and Coats-Redfern method. The apparent activation energy (E) and the pre-exponential factor (In A) of each decomposition were obtained. The most probable thermal decomposition reaction mechanisms were proposed by comparison of the kinetic parameters. The kinetic equation for both the second stage and the third stage can be expressed as d alpha/dt = Ae(-E/RT) -(1 - alpha)(2), and the fourth stage d alpha/dt = Ae(-E/RT) -(1 - alpha). And their mathematic expressions of the kinetic compensation effects of thermal decomposition reaction were also determined. 展开更多
关键词 physical chemistry thermal decomposition mechanism non-isothermal kinetics TG-DTG polyoxometalate complex CIPROFLOXACIN tungstoborate
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Non-isothermal Kinetics of the First-stage Decomposition Reaction of Cobalt Oxalate Dihydrate 被引量:1
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作者 ZHANGJian-jun RENNing BAIJi-hai 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第4期501-504,共4页
关键词 Cobalt oxalate dihydrate non-isothermal kinetics thermal decomposition TG-DTG
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Studies on Non-isothermal Kinetics of Thermal Decomposition of Strontium Chloride Hexahydrate 被引量:1
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作者 张建军 穆平 +2 位作者 刘贺喜 郭永宏 陈会兰 《Rare Metals》 SCIE EI CAS CSCD 1998年第3期13-18,共6页
The thermal decomposition of the strontium chloride hexahydrate and its kinetics were studied under non isothermal condition in nitrogen by thermogravimetric and derivative thermogravimetric techniques. The intermedi... The thermal decomposition of the strontium chloride hexahydrate and its kinetics were studied under non isothermal condition in nitrogen by thermogravimetric and derivative thermogravimetric techniques. The intermediate and residue for each decomposition were identified from TG curve. The non isothermal kinetic data were analyzed by the Achar method and the Coats Redfern method. The possible reaction mechanisms were suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as d α /d t = A exp(- E/RT)(1-α ), the second stage, d α /d t = A exp(- E/RT)3(1-α ) 2/3 , and the third stage, d α /d t = A exp(- E/RT)3/2(1-α ) 2/3 [1-(1- α ) 1/3 ] -1 . Mathematic expressions of the kinetic compensation effects of each stage of the thermal decomposition reaction were also obtained. 展开更多
关键词 thermal decomposition Strontium chloride hexahydrate Non isothermal kinetic
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Study on thermal decomposition kinetics of azobenzene-4,4′-dicarboxylic acid by using compensation parameter method and nonlinear fitting evaluation
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作者 Shuyi Shen Song Guo +1 位作者 Sining Chen Jinhua Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第6期269-279,共11页
Recently,azobenzene-4,4'-dicarboxylic acid(ADCA)has been produced gradually for use as an organic synthesis or pharmaceutical intermediate due to its eminent performance.With large quantities put into application ... Recently,azobenzene-4,4'-dicarboxylic acid(ADCA)has been produced gradually for use as an organic synthesis or pharmaceutical intermediate due to its eminent performance.With large quantities put into application in the future,the thermal stability of this substance during storage,transportation,and use will become quite important.Thus,in this work,the thermal decomposition behavior,thermal decomposition kinetics,and thermal hazard of ADCA were investigated.Experiments were conducted by using a SENSYS evo DSC device.A combination of differential iso-conversion method,compensation parameter method,and nonlinear fitting evaluation were also used to analyze thermal kinetics and mechanism of ADCA decomposition.The results show that when conversion rate α increases,the activation energies of ADCA's first and main decomposition peaks fall.The amount of heat released during decomposition varies between 182.46 and 231.16 J·g^(-1).The proposed kinetic equation is based on the Avrami-Erofeev model,which is consistent with the decomposition progress.Applying the Frank-Kamenetskii model,a calculated self-accelerating decomposition temperature of 287.0℃is obtained. 展开更多
关键词 Azobenzene-4 4′-dicarboxylic acid thermal decomposition behavior kinetic mechanism thermal hazard evaluation Compensation parameter effect
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Non-isothermal kinetics of the first-stage decomposition reaction of the complex of samarium p-methoxybenzoate with 1,10-phenanthroline
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作者 ZHANG Jianjun REN Ning +1 位作者 CHAI Xingquan WANG Yanxun 《Rare Metals》 SCIE EI CAS CSCD 2007年第3期292-298,共7页
The complex of [Sm(p-MOBA)3phen]2 (p-MOBA, p-methoxybenzoate; phen,1 10-phenanthroline) was prepared and characterized by elemental analysis, IR, and UV spectroscopy. The thermal decomposition of the [Sm(p-MOBA)... The complex of [Sm(p-MOBA)3phen]2 (p-MOBA, p-methoxybenzoate; phen,1 10-phenanthroline) was prepared and characterized by elemental analysis, IR, and UV spectroscopy. The thermal decomposition of the [Sm(p-MOBA)sphen]2 complex and its kinetics were studied under a static air atmosphere by TG-DTG methods. The intermediate and residue for each decomposition stage were identified from the TG curve. The kinetic parameters and mecha- nisms of the first decomposition stage were obtained from the analysis of the TG-DTG curves by a new method of processing the data of thermal analysis kinetics. The lifetime equation at a mass loss of 10% was deduced as lnr= - 30.6795 + 21034.56/Tby isothermal thermogravimelric analysis. 展开更多
关键词 inorganic chemistry p-methoxybenzoic acid 1 10-PHENANTHROLINE samarium complex thermal decomposition non-isothermal kinetics TG-DTG
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Synthesis Characterization Non-isothermal Kinetics of the Thermal Decomposition and Redox Properties Derived from Copper(Ⅱ) Binuclear Coordination Compound of 1,4-Bis-(1'-Phenyl-3'-Methyl-5'-Pyrazolone-4')-1,4-Butanedione
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作者 Cun SHAN Dian Zen JIA Xi XIA(Department of Chemistry,, Xinjiang University, Urumqi,830046). 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第5期455-458,共4页
The paper reports the synthetic procedure and character of Copper(II) binuclearcoordination compound of 1,4-bis-(1'-phenyl-3'-methyl-5'-pyrazolone Thenon-isothermal kinetics of thermal decomposition of the... The paper reports the synthetic procedure and character of Copper(II) binuclearcoordination compound of 1,4-bis-(1'-phenyl-3'-methyl-5'-pyrazolone Thenon-isothermal kinetics of thermal decomposition of the complex has been stUdied from the TG-DTGcurves by means of the Achar et al. and Coats-Redfern methods,the most probab1e kinetic equation canbe expressed as dofdtrAe -E / RT * l /(2Q).The corresponding kinetic compensation effect expressions arefound to be lnuA=0. 1794E+0. 1689.The non-isothermal thermal decomposition process of the complex isone-dimensional diffusion.But electrochemical studies of the complex(Cu2L'2)from cyclic voltamrnetriccurves by means of powder microelectrodes technique'',shows one two-electron irreversible process. 展开更多
关键词 Methyl-5 Phenyl-3 Pyrazolone-4 Synthesis Characterization non-isothermal kinetics of the thermal decomposition and Redox Properties Derived from Copper Binuclear Coordination Compound of 1 4-Bis
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Synthesis, Characterization, Thermal Decomposition Mechanism and Non-Isothermal Kinetics of Salicylaldehyde Salicylhydrazone and Its Complex of Erbium(Ⅲ)
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作者 吴望婷 何水样 +3 位作者 刘煜 赵宏安 胡荣祖 史启祯 《Journal of Rare Earths》 SCIE EI CAS CSCD 2004年第S1期16-20,共5页
The salicylaldehyde salicylhydrazone and its complex of Er(Ⅲ) were synthesized. The formulae K·4H_2O(HL=[C_(14)H_(10)N_2O_3]^(2-), the bivalent form of the salicylaldehyde salicylhydrazone) were determined by el... The salicylaldehyde salicylhydrazone and its complex of Er(Ⅲ) were synthesized. The formulae K·4H_2O(HL=[C_(14)H_(10)N_2O_3]^(2-), the bivalent form of the salicylaldehyde salicylhydrazone) were determined by elemental analysis and EDTA volumetric analysis. Molar conductance, IR, UV and X-ray power diffraction were carried out for the characterizations of the complex and the ligand. There are two stable five-numbered and six-numbered circles in the complex. The thermal decompositions of the ligand and the complex with the kinetic study are carried out by non-isothermal thermogravimetry. The stages of the decompositions were identified by TG-DTG curve. The non-isothermal kinetic data were analyzed by means of integral and differential methods. The possible reaction mechanism and the kinetic equation were investigated by the corresponding kinetic parameters.The activation energy value of the main step decomposition are also calculated by Kissinger′s method and Ozawa′s method. 展开更多
关键词 salicylaldehyde salicyloyhydrazone erbium(Ⅲ) complex thermal decomposition non-thermal kinetics mechanism function rare earths
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Kinetics of Thermal Decomposition of Nd[(C_5H_ (10)NS_2)_3(C_ (12)H_8N_2)] in Non-Isothermal Conditions
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作者 焦宝娟 陈三平 +1 位作者 胡荣祖 高胜利 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期82-85,共4页
The non-isothermal decomposition reaction of Nd[(C_5H_ 10NS_2)_3(C_ 12H_8N_2)] were carried out by means of TG-DTG and the thermal decomposition mechanism, and the associated kinetics was investigated. The kinetic par... The non-isothermal decomposition reaction of Nd[(C_5H_ 10NS_2)_3(C_ 12H_8N_2)] were carried out by means of TG-DTG and the thermal decomposition mechanism, and the associated kinetics was investigated. The kinetic parameters are obtained from an analysis of the TG-DTG curves at different heating rate by integral and differential methods. The most probable kinetic model function of the decomposition reaction is Maple Power of n=3/2, f(α)=2/3α -1/2 and the apparent activation energy E is 116.67 kJ·mol -1 and the pre-exponential factor lg[A/s -1] is 7.6891. 展开更多
关键词 Nd[(C_5H_ 10NS_2)_3(C_ 12H_8N_2)] non-isothermal kinetics TG-DTG thermal decomposition rare earths
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Decomposition mechanisms and non-isothermal kinetics of LiHC_2O_4·H_2O
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作者 CHOU Kuo-Chih 《Rare Metals》 SCIE EI CAS CSCD 2012年第6期615-620,共6页
The thermal decomposition process of LiHC2O4·H2O from 30 to 600 ℃ was investigated by the thermogravimetric and differential scanning calorimetry (TG-DSC). The phases decomposited at different temperature were c... The thermal decomposition process of LiHC2O4·H2O from 30 to 600 ℃ was investigated by the thermogravimetric and differential scanning calorimetry (TG-DSC). The phases decomposited at different temperature were characterized by X-ray diffraction (XRD), which indicated the decompositions at 150, 170, and 420℃, relating to LiHC2O4, Li2C2O4, Li2C2O4, and Li2CO3, respectively. Reaction mechanisms in the whole sintering process were determined, and the model fitting kinetic approaches were applied to data for non-isothermal thermal decomposition of LiHC2O4?H2O; finally, the kinetic parameters of each reaction were also calculated herein. 展开更多
关键词 apparent activation energy non-isothermal reaction mechanism thermal decomposition
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NON-ISOTHERMAL KINETICS OF THERMAL DECOMPOSITION OF A NOVEL ANTITUMOR AGENT 4-{5-[3,4-DIMETHYL-5-(3,4,5-TRIMETHOXYPHENYL)THIOPHEN-2-YL]-2-METHOXYPHENYL}MORPHOLINE
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作者 LEI Yingjie SHI Jixian YU Mei 《Transactions of Tianjin University》 EI CAS 2006年第1期46-49,共4页
The thermal decomposition of a new antitumor agent,4-{5-[3,4-dimethyl-5-(3,4,5-trimethoxyphenyl)thiophen-2-yl]-2-methoxyphenyl}morpholine was studied by Differential Scanning Calorimetry(DSC)and Thermogravimetry(TG)/D... The thermal decomposition of a new antitumor agent,4-{5-[3,4-dimethyl-5-(3,4,5-trimethoxyphenyl)thiophen-2-yl]-2-methoxyphenyl}morpholine was studied by Differential Scanning Calorimetry(DSC)and Thermogravimetry(TG)/Derivative Thermogravimetry(DTG)methods at a flow rate of nitrogen gas of 120 mL/min,The kinetic parameters were obtained from the analysis of the corresponding curves by Kissinger's method,Ozawa's method and the integral method,The results indicate that the apparent activation energy and pre-exponential constants of the decomposition reaction are 106.67 kJ/mol and 10^6.19s^(-1),respectively. 展开更多
关键词 4-{5-[3 4-Dimethyl-5-(3 4 5-Trimethoxyphenyl)Thiophen-2-yl]-2-Methoxyphenyl}morpholine thermal decomposition kinetics
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The non-isothermal gravimetric method for study the thermal decomposition kinetic of HNBB and HNS explosives 被引量:3
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作者 Hamid Reza Pouretedal Sajjad Damiri Zahra Bighamian 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2020年第1期251-256,共6页
The hexanitrostilben(HNS) is a thermally stable explosive that can be prepared from hexanitrobibenzyl(HNBB).Therefore,the investigation of thermal stability of HNBB can be important in the yield of preparation of HNS.... The hexanitrostilben(HNS) is a thermally stable explosive that can be prepared from hexanitrobibenzyl(HNBB).Therefore,the investigation of thermal stability of HNBB can be important in the yield of preparation of HNS.The decomposition kinetic of HNBB and HNS are studied by non-isothermal gravimetric method.The TG/DTG curves in non-isothermal method are obtained in range of 25℃-400℃at heating rates of 3℃/min,5℃/min,8℃/min,10℃/min and 12℃/min.The data of weighttemperature are used for calculation of activation energy(E_a) of thermal decomposition reactions by methods of Ozawa,Kissinger,Ozawa-Flynn-Wall(OFW) and Kissinger-Akahira-Sunose(KAS) as modelfree methods and Strink's equation as model-fitting method.The compensation effect is used for prediction of mechanism and determination of pre-exponential factor(InA) of the decomposition reaction.A reduction 60 kj/mol for the average of activation energy of thermal decomposition reaction of HNBB is obtained versus HNS.This result shows the lower thermal stability of HNBB in comparison to HNS,The Avrami equation(A_(3/2)) with function f(α)=3/2(1-α)[-In(1-α)]^(1/3) indicates the predicted mechanism for thermal decomposition reaction both explosives. 展开更多
关键词 HNS HNBB decomposition thermal kinetIC
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Thermal Decomposition Behavior and Kinetic Study of Jamadoba Coal and Its Density Separated Macerals: A Non-Isothermal Approach 被引量:1
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作者 Deepak Chandra Sau Amit Banerjee +3 位作者 Sanchita Chakravarty Pragyan Senapati Rabiranjan Murmu Harekrushna Sutar 《Advances in Chemical Engineering and Science》 2021年第3期203-227,共25页
This kinetic study focuses on determining the thermal gravimetric profile of a particular grade of Indian sub-bituminous coal. A thermogravimetric analyzer (TGA-1000) was employed to investigate the thermal behavior a... This kinetic study focuses on determining the thermal gravimetric profile of a particular grade of Indian sub-bituminous coal. A thermogravimetric analyzer (TGA-1000) was employed to investigate the thermal behavior and extract the kinetic parameters of Jamadoba coal and its corresponding density sepa<span style="font-family:Verdana;color:#000000;">rated macerals. The weight loss was measured in air atmosphere. The coal </span><span style="font-family:Verdana;color:#000000;">samples used in this study were obtained from Jamadoba mines, Jharkhand. Sam</span><span style="font-family:Verdana;color:#000000;">ples of 35 mg and 200 μm mean size were subjected to synthetic air atmos</span><span style="font-family:Verdana;color:#000000;">pheres (21% O</span><sub><span style="font-family:Verdana;color:#000000;">2</span></sub><span style="font-family:Verdana;color:#000000;">). Heating rates of 2, 5 and 7</span><span style="font-family:;" "=""><span style="color:#000000;font-family:Verdana;">°</span><span style="font-family:Verdana;color:#000000;"></span><span><span style="font-family:Verdana;color:#000000;">C/min were applied until the tempera</span><span style="font-family:Verdana;color:#000000;">ture reached 1400</span></span><span><span style="color:#000000;font-family:Verdana;">°</span><span style="font-family:Verdana;color:#000000;">C, which was kept constant until burnout. Low heating</span></span><span><span style="font-family:Verdana;color:#000000;"> rate was preferred so that devolatilization occurs prior to ignition and </span><span style="font-family:Verdana;color:#000000;">combust</span><span style="font-family:Verdana;color:#000000;">ion. Derivative thermogravimetry (DTG) analysis method was applied to </span><span style="font-family:Verdana;color:#000000;">measure the weight changes and rates of weight loss used for calculating the kinetic parameters. The activation energy (</span><i><span style="font-family:Verdana;color:#000000;">E</span><sub><span style="font-family:Verdana;color:#000000;">a</span></sub></i><span style="font-family:Verdana;color:#000000;">) and pre-exponential factor were obtained </span><span style="font-family:Verdana;color:#000000;">from model-free methods by applying non-isothermal thermogravimetry</span><span style="font-family:Verdana;color:#000000;"> analysis.</span></span></span> 展开更多
关键词 thermal decomposition kinetic Study Jamadoba Coal non-isothermal
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Non-Isothermal Kinetic Analysis of Thermal Decomposition of the Ca-Bentonite from Santai, China
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作者 ZHANG Xianghui HE Chuan +3 位作者 WANG Ling DENG Miao LIU Jing FENG Qian 《矿物学报》 CAS CSCD 北大核心 2013年第S1期138-138,共1页
The thermal decompositions of Ca-bentonites (CaB) from Santai ,Shichuan Province, China over the temperature rage of 30-1100℃ were investigated by simultaneous thermal analyzer. Non-isothermal Kinetic analysis were e... The thermal decompositions of Ca-bentonites (CaB) from Santai ,Shichuan Province, China over the temperature rage of 30-1100℃ were investigated by simultaneous thermal analyzer. Non-isothermal Kinetic analysis were employed to study the thermal decomposition mechanism by using Netzsch Thermokinetics software. The dependence of the activation energy on conversion degree were evaluated by isoconversional methods. The probably mechanism and the corresponding kinetic parameters were determined by multivariate non-linear regression program. 展开更多
关键词 non-isothermal kinetIC SIMULTANEOUS thermal analysis CA-BENTONITE thermal d
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Characterization and Non-isothermal Decomposition Kinetic Analysis of PS/FeNi_3 Nanocomposites
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作者 丁建旭 廖其龙 +2 位作者 王圣来 杨定明 王新强 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第10期1593-1598,共6页
Polystyrene/iron-nickel (PS/FeNi3) nanocomposites were synthesized via an in-situ polymerization route and characterized by XRD,SEM and FTIR. FeNi3 nanoparticles were characterized by TEM and XRD. The pure FeNi3 nan... Polystyrene/iron-nickel (PS/FeNi3) nanocomposites were synthesized via an in-situ polymerization route and characterized by XRD,SEM and FTIR. FeNi3 nanoparticles were characterized by TEM and XRD. The pure FeNi3 nanoparticles (100~125 nm) were highly clustered and percolated through the PS matrix. When the content of FeNi3 nanoparticles reached 5 wt%,an interaction between FeNi3 nanoparticles and PS matrix was observed. The thermal decomposition behavior of PS/FeNi3 nanocomposites was investigated by thermal analysis. The activation energies (E) and pre-exponential factors (lnA) were calculated by using Archar method. The results show that the thermal decomposition of pure PS is a one-dimensional diffusion mechanism. A three-dimensional diffusion mechanism appears when FeNi3 nanoparticles incorporate. The E of PS/FeNi3 nanocomposites with different FeNi3 contents is 217.5,225.3,180.6 and 73.0 kJ·mol-1,and the corresponding lnA is 35.6,34.9,27.5 and 10.4 S-1,respectively. 展开更多
关键词 POLYSTYRENE NANOCOMPOSITES non-isothermal decomposition kinetics
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