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Synthesis and Crystal Structure of 3,3'-Bis(5-(N-(4-hydroxylphenyl)imidomethyl)- pyrrol-2-yl)pentane·2CH_3OH 被引量:3
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作者 徐兰 刘尚远 尹振明 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第4期613-617,共5页
3,3'-Bis(5-(N-(4-hydroxylphenyl)imidomethyl)pyrrol-2-yl)pentane 1 has been synthesized and characterized. The crystal of its methanol complex, 1·(CH3OH)2, belongs to the orthorhombic system, space group ... 3,3'-Bis(5-(N-(4-hydroxylphenyl)imidomethyl)pyrrol-2-yl)pentane 1 has been synthesized and characterized. The crystal of its methanol complex, 1·(CH3OH)2, belongs to the orthorhombic system, space group Pccn with a = 18.094(2), b = 11.6890(16), c = 13.3629(19) , V = 2826.3(7) 3, Z = 8, C14.5H18N2O2, Mr = 252.31, Dc = 1.186 g/cm3, F(000) = 1080 and μ(MoKα) = 0.080 mm-1. The final R = 0.0662 and wR = 0.1801 for 1908 observed reflections with I 2σ(I), and R = 0.0800 and wR = 0.1948 for all reflections. In the solid state, bridged by included methanol molecules, the molecules of compound 1 form interpenetrated grid structure through N–H···O and O–H···O hydrogen bonds. 展开更多
关键词 3 3‘-bis(5-(N-(4-hydroxylphenyl)imidomethyl)pyrrol-2-yl)pentane crystal structure hydrogen bonding
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Characterization ofanovel deep-seamicrobial esterase EstC 10 and its use in the generation o f(R)-methyl 2-chloropropionate 被引量:5
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作者 GONG Yanhui MA Sanmei +4 位作者 WANG Yongfei XU Yongkai SUN Aijun ZHANG Yun HU Yunfeng 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2018年第2期473-482,共10页
A novel esterase EstC10 from Bacillus sp. CX01 isolated from the deep sea of the Western Pacific Ocean and the functionalities of EstC 10 was characterized. At present, the reports about the kinetic resolution ofracem... A novel esterase EstC10 from Bacillus sp. CX01 isolated from the deep sea of the Western Pacific Ocean and the functionalities of EstC 10 was characterized. At present, the reports about the kinetic resolution ofracemic methyl 2-chloropropionate were quite rare. So we developed deep-sea microbial esterase EstC10 as a novel biocatalyst in the kinetic resolution of racemic methyl 2-chloropropionate and generate (R)-methyl 2-chloropropionate with high enantiomeric excess (〉99%) after the optimization of process parameters such as pH, temperature, organic co-solvents, surfactants, substrate concentration and reaction time. Notably, the optimal substrate concentration (80 mmol/L) of esterase EstC10 was higher than the kinetic resolution of another esterase, Estl2-7 (50 mmoFL). The novel microbial esterase EstC10 identified from the deep sea was a promising green biocatalyst in the generation of (R)-methyl 2-chloropropionate as well of many other valuable chiral chemicals in industry. 展开更多
关键词 BIOCATALYSIS deep-sea microorganisms novel esterase kinetic resolution (R)-methyl 2-chloropropionate
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Controlled Self-assembly of Two Coordination Polymers via subtly Varying Bis(2-methyl imidazole) Ligands:from 3-Connected(6,3) Net to 4-Connected sql Net 被引量:4
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作者 王桂霞 吴海霞 +1 位作者 李召好 赵邦屯 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第7期1074-1080,共7页
Two coordination polymers constructed from 3,4-thiophenedicarboxylic acid and bis(2-methyl imidazole) ligands, namely, {[Cd2(tdc)2(bip)2]·7H20}n (1) and [Cd(tdc)(bib)]n (2) (Hgtdc = 3,4-thiophenedi... Two coordination polymers constructed from 3,4-thiophenedicarboxylic acid and bis(2-methyl imidazole) ligands, namely, {[Cd2(tdc)2(bip)2]·7H20}n (1) and [Cd(tdc)(bib)]n (2) (Hgtdc = 3,4-thiophenedicarboxylic acid, bip = 1,3-bis-(imidazol-2-methyl)propane and bib = 1,4-bis(imidazol-2-methyl)butane), have been synthesized and structurally characterized by single-crystal X-ray diffraction. Structural analyses reveal that 1 exhibits a two-dimensional (2D) layered network with 3-connected (6,3) topology, which is further connected into a three- dimensional (3D) supramolecular structure by intermolecular hydrogen bonds. However, 2 features a 2D network which can be rationalized as a 4-connected sql net. The results indicate the subtle difference of auxiliary bis(imidazol-2-methyl) ligands may lead to diverse architectures. Moreover, they exhibit luminescence emission in the solid state at room temperature. 展开更多
关键词 3 4-thiophenedicarboxylic acid bis(imidazoi-2-methyl ligands crystal structure photoluminescent properties
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Theoretical Study on the Reaction Mechanism of o-Aminophenol, Acetic Acid and Phosphorus Oxytrichloride One-pot to Form 2-Methyl Benzoxazole
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作者 ZHANG Fu-Lan 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第12期1869-1877,1843,共10页
The reaction mechanism of o-aminophenol, acetic acid and phosphorus oxytrichloride in one-pot to form 2-methyl benzoxazole was studied by density functional theory. The geometries of the reactants, transition states, ... The reaction mechanism of o-aminophenol, acetic acid and phosphorus oxytrichloride in one-pot to form 2-methyl benzoxazole was studied by density functional theory. The geometries of the reactants, transition states, intermediates and products were optimized at the GGA/PW91/DNP level. Vibration analysis was carried out to confirm the transition state structure. Two possible reaction pathways were investigated in this study. The result indicates that the reaction Re→TS1→IM1→TSA2→IMA2→TSA3→IMA3→TSA4→IMA4→TSA5→P2 is the main pathway, the activation energy of which is the lowest. Re→TS1→IM1 is the rate-limiting step, with the activation energy being 221.54 kJ·mol^(-1) and the reaction heat being 10.06 kJ·mol^(-1). The dominant product predicted theoretically is in agreement with the experiment results. 展开更多
关键词 O-AMINOPHENOL acetic acid phosphorus oxytrichloride 2-methyl benzoxazole density functional reaction mechanism
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XRD Pattern of Liquid Crystal Monomer Acrylate That Conjugated with Cholesterol and p-Hydroxyphenyl-2-Methyl Butanoic
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作者 Afrlzal Muhammad Hikam +1 位作者 Bambang Soegiyono Asep Riswoko 《Journal of Chemistry and Chemical Engineering》 2012年第12期1051-1055,共5页
It was successfully synthesized liquid crystal monomer acrylate that conjugated with two mesogens were cholesterol and p-hydroxyphenyl-2-methyl Butanoat which called MA (monomer cholesteryl acrylate) and monomer (S... It was successfully synthesized liquid crystal monomer acrylate that conjugated with two mesogens were cholesterol and p-hydroxyphenyl-2-methyl Butanoat which called MA (monomer cholesteryl acrylate) and monomer (S)-(+)-4-(2-Methyl butanoat-l-butyloxy) phenyl 4-[1-(propenoyloxy) butyloxy] benzoate (MB). Two monomers were characterized by DSC (differential scanning calorimetry), POM (polarization optical microscopy) and XRD (X-ray diffraction). Mesophase temperatures of MA and MB are 81.28 ~C and 54.36~C, respectively. Textures analysis by POM shows that MA was oily streak and MB was schlieren. XRD pattern shows the strongest three peaks of MA at room temperature which are (20, deg): 2.7153, 5.2992 and 18.8500. The Strongest three peaks of MB at room temperature are (20, deg): 9.1726, 9.7707 and 12.5389. XRD pattern of MA and MB at mesophase and above mesophase temperature that each peaks disappear. 展开更多
关键词 Liquid crystal cholesteryl acrylate p-hydroxyphenyl-2-methyl butanoat.
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Interaction of N-(2-Methyl Thio Phenyl)-2-Hydroxy-1-Naphthaldimine with Tin Dioxide Nanoparticles: A Spectroscopic Approach
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作者 Suvetha Rani Jayaprakash Ramakrishnan Veerabahu 《American Journal of Analytical Chemistry》 2012年第8期518-523,共6页
The interaction of N-(2-methyl thiophenyl)-2-hydroxy-1-naphthaldimine (NMTHN) with tin dioxide nanoparticles (SnO2 NPs) has been investigated by spectroscopic tools such as absorption and fluorescence spectroscopy. Ab... The interaction of N-(2-methyl thiophenyl)-2-hydroxy-1-naphthaldimine (NMTHN) with tin dioxide nanoparticles (SnO2 NPs) has been investigated by spectroscopic tools such as absorption and fluorescence spectroscopy. Absorption spectroscopy reveals the formation of ground state complex. Fluorescence spectroscopy has been used to study the signatures of fluorescence quenching. SnO2 NPs are found to quench the intrinsic fluorescence of NMTHN via static and dynamic quenching. The deviation from linearity in the Stern-Volmer plot has been observed. 展开更多
关键词 N-(2-methyl Thiophenyl)-2-Hydroxy 1-Naphthaldimine Tindioxide NANOPARTICLES Optical Absorption Fluorescence Quenching
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S_2O_8^(2-)和SO_4^(2-)促进ZrO_2固体超强酸正戊烷反应性能差异的研究 被引量:22
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作者 宋国新 王琳 +2 位作者 薛华欣 张黎 陈建民 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2003年第1期130-134,共5页
考察了常温下 S2 O2 - 8 促进 Zr O2 ( PSZ)固体超强酸催化剂上正戊烷的反应性能 ,并与 SO2 - 4 促进 Zr O2( SZ)反应相比较 ,观察到 PSZ和 SZ对正戊烷都具有异构化和裂解的双重作用 ,主要产物分别为异戊烷和异丁烷 .正戊烷的异构化转... 考察了常温下 S2 O2 - 8 促进 Zr O2 ( PSZ)固体超强酸催化剂上正戊烷的反应性能 ,并与 SO2 - 4 促进 Zr O2( SZ)反应相比较 ,观察到 PSZ和 SZ对正戊烷都具有异构化和裂解的双重作用 ,主要产物分别为异戊烷和异丁烷 .正戊烷的异构化转化率和表观反应速率常数主要取决于样品的焙烧温度 .但对于正戊烷异构化反应 ,PSZ的最佳焙烧温度为 5 5 0℃ ,比 SZ的低 5 0℃ .在各自的最佳焙烧温度下反应 1 h后 ,前者的异戊烷生成率为后者的 1 .3倍 .通过 S含量和比表面积测定以及用 XRD和 FTIR等手段分析了 PSZ的物理化学特性 .从原位 FTIR谱图发现 ,PSZ( 5 5 0℃ )表面 S— O键的红外吸收明显比 SZ( 6 0 0℃ )的强 ;通过吡啶红外手段发现 PSZ( 5 5 0℃ )吡啶离子吸收峰的红移大于 SZ( 6 0 0℃ ) ,表明前者的 Lewis酸强于后者 . 展开更多
关键词 反应性能 固体超强酸 二氧化锆 正戊烷 异构化 裂解
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碳化钨负载S_2O_8^(2-)/ZrO_2固体超强酸催化剂上的正戊烷反应研究 被引量:13
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作者 薛华欣 宋国新 +1 位作者 王琳 陈建民 《化学学报》 SCIE CAS CSCD 北大核心 2003年第2期208-212,共5页
首次研究了碳化钨负载S2 O2 -8 ZrO2 (PSZ)固体超强酸催化剂 (WC PSZ)上正戊烷的反应情况及影响催化剂活性的各种因素 ,并用GC MS ,XRD ,BET等手段分析了正戊烷反应产物和催化剂的物理化学性质等 .结果表明 :WC PSZ对正戊烷具有异构化... 首次研究了碳化钨负载S2 O2 -8 ZrO2 (PSZ)固体超强酸催化剂 (WC PSZ)上正戊烷的反应情况及影响催化剂活性的各种因素 ,并用GC MS ,XRD ,BET等手段分析了正戊烷反应产物和催化剂的物理化学性质等 .结果表明 :WC PSZ对正戊烷具有异构化和裂解的双重催化作用 .PSZ在负载适量碳化钨后对正戊烷反应的活性和选择性显著提高 ,显示出优于Pt PSZ催化剂的效果 ,碳化钨的负载量为 2 0 %的效果最佳 .适当的焙烧。 展开更多
关键词 碳化钨 负载固体超强酸催化剂 正戊烷 催化活性 异构化 裂解
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2-甲基-2-戊烯酸的合成新工艺 被引量:8
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作者 张红 杨辉荣 丁盈红 《精细石油化工》 CAS CSCD 北大核心 2005年第2期22-24,共3页
以丙醛为原料,经自缩合合成了中间体2-甲基-2-戊烯醛,再经NaClO2氧化合成了2-甲基-2-戊烯酸。较佳反应条件为:第一步,NaOH/丙醛(摩尔比)=0.09:1,w(NaOH)=2%,40℃反应45min,收率为93%;第二步,NaClO2/醛(摩尔比)=1.6:1,H2O2/醛(摩尔比)=1.... 以丙醛为原料,经自缩合合成了中间体2-甲基-2-戊烯醛,再经NaClO2氧化合成了2-甲基-2-戊烯酸。较佳反应条件为:第一步,NaOH/丙醛(摩尔比)=0.09:1,w(NaOH)=2%,40℃反应45min,收率为93%;第二步,NaClO2/醛(摩尔比)=1.6:1,H2O2/醛(摩尔比)=1.2:1,反应时间3h,乙腈用量50mL,反式2-甲基-2-戊烯酸摩尔收率约85%,产物经IR和1HNMR确证了结构。 展开更多
关键词 2-甲基-2-戊烯醛 2-甲基-2-戊烯酸 亚氯酸钠 合成工艺 草莓酸
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正戊烷-正戊烯萃取精馏过程模拟计算
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作者 栾成昊 于盼虎 +5 位作者 李硕 陈小平 陈修英 刘国勇 王臻 田晖 《石油炼制与化工》 CAS CSCD 北大核心 2024年第3期107-112,共6页
随着乙烯工业的不断发展,对其副产物裂解C 5馏分进行分离利用以提高C 5馏分的附加值成为未来发展的趋势。以正戊烷-正戊烯体系为例,使用常见的3种萃取剂乙腈、甲乙酮和N-甲基吡咯烷酮对其进行萃取精馏过程模拟计算,在规定纯度(质量分数... 随着乙烯工业的不断发展,对其副产物裂解C 5馏分进行分离利用以提高C 5馏分的附加值成为未来发展的趋势。以正戊烷-正戊烯体系为例,使用常见的3种萃取剂乙腈、甲乙酮和N-甲基吡咯烷酮对其进行萃取精馏过程模拟计算,在规定纯度(质量分数不小于95%)与回收率(不小于90%)的条件下对不同萃取剂模拟能耗进行了对比,建立了相应的数学模型,进行了萃取过程的分析与优化,进一步考察了塔板数、原料和萃取剂进料位置、操作回流比、萃取剂用量等因素的影响。结果表明,使用N-甲基吡咯烷酮作为萃取剂更为合理,优化的操作条件为:理论塔板数65块,原料与萃取剂进料位置分别在第45块和第5块塔板处,回流比3.7,萃取剂流量1030 kg/h。在该条件下,所得正戊烷纯度在95%以上,回收率大于91%。 展开更多
关键词 正戊烷 1-戊烯 萃取精馏 乙腈 N -甲基吡咯烷酮 甲乙酮
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Pt-SO_4^(2-)/ZrO_2-Al_2O_3催化剂的制备及其催化正戊烷异构化性能 被引量:3
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作者 宋华 张旭 +1 位作者 石羊 李锋 《化学工程》 CAS CSCD 北大核心 2011年第5期31-35,共5页
制备了Pt-SO42-/ZrO2-A l2O3固体超强酸催化剂,采用XRD,TG-DTA,FT-IR,TPR,SEM,BET,ICP等表征方法对催化剂进行了表征。以正戊烷异构化反应为探针,在高压固定床-色谱联合装置上,评价了催化剂的活性,考察了空速v空、反应温度t、反应压力p... 制备了Pt-SO42-/ZrO2-A l2O3固体超强酸催化剂,采用XRD,TG-DTA,FT-IR,TPR,SEM,BET,ICP等表征方法对催化剂进行了表征。以正戊烷异构化反应为探针,在高压固定床-色谱联合装置上,评价了催化剂的活性,考察了空速v空、反应温度t、反应压力p和氢与正戊烷摩尔比对正戊烷异构化反应的影响。在t=200℃,p=2.0 MPa,v空=1.5 h-1,n(氢)/n(正戊烷)=4∶1的条件下反应时,正戊烷转化率为72.9%,异戊烷收率为67.6%,异戊烷选择性为92.8%,液收率为94.8%。 展开更多
关键词 固体超强酸 SO42- 异构化 PT ZRO2-AL2O3 正戊烷
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铝促进的SO_4^(2-)/ZrO_2催化剂上正戊烷低温异构化 被引量:3
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作者 曹崇江 陈长林 徐南平 《南京工业大学学报(自然科学版)》 CAS 2005年第1期76-77,共2页
Aluminum-promoted sulfated zirconia (ASZ) catalyst was prepared by impregnation of zirconium hydroxide with aqueous Al2(SO4)3 followed by calcinations. The characterization of these samples was carried out with va... Aluminum-promoted sulfated zirconia (ASZ) catalyst was prepared by impregnation of zirconium hydroxide with aqueous Al2(SO4)3 followed by calcinations. The characterization of these samples was carried out with various techniques such as X-ray powder diffraction (XRD), N2 adsorption (BET), NH3 temperature-programmed desorption (NH3-TPD). The results indicated that the addition of aluminum has an effect on acid properties of the catalysts. Isomerization of n-pentane was carried out at 2.0 MP, WHSV 0.5 and H2/pentane molar ration of 4. In comparison to sulfated zirconia (SZ), ASZ catalyst exhibited high catalytic activity and stability at low reaction temperature. In particular, when the reaction temperature was 120 ℃, the n-pentane conversion over ASZ remains at 80%, which is closed to its equilibrium conversion after running on stream for 6 h. 展开更多
关键词 催化剂 正戊烷 异构化 汽油 辛烷值 炼油工业
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3-(4-苯基-1,3-二硫戊环-2-亚甲基)-2,4-戊二酮的合成及其与芳醛的缩合反应 被引量:1
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作者 王艳茹 于海丰 +1 位作者 李晓芳 刘群 《华东师范大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第4期109-113,139,共6页
以碳酸钾为碱,以N,N-二甲基甲酰胺为溶剂,乙酰丙酮与二硫化碳及1,2-二溴苯乙烷反应,以中等产率(47%)合成了3-(4-苯基-1,3-二硫戊环-2-亚甲基)-2,4-戊二酮2.碱性条件下,化合物2比较稳定,通过对碱的选择和芳醛量的控制,化合物2与芳醛缩合... 以碳酸钾为碱,以N,N-二甲基甲酰胺为溶剂,乙酰丙酮与二硫化碳及1,2-二溴苯乙烷反应,以中等产率(47%)合成了3-(4-苯基-1,3-二硫戊环-2-亚甲基)-2,4-戊二酮2.碱性条件下,化合物2比较稳定,通过对碱的选择和芳醛量的控制,化合物2与芳醛缩合可分别以较高的产率合成单面和双面缩合产物1d和1e. 展开更多
关键词 3-(4-苯基-1 3-二硫戊环-2-亚甲基)-2 4戊二酮 芳醛 缩合反应
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柔性1,5-二(2-乙基咪唑)戊烷配体构筑的两个d10金属配合物的合成、结构及性质(英文)
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作者 陈满生 黄秀玉 +3 位作者 陈小利 刘琴 何湘良 曾昭建 《无机化学学报》 SCIE CAS CSCD 北大核心 2017年第6期1090-1096,共7页
利用过渡金属镉(锌)盐与1,5-二(2-乙基咪唑)戊烷(BEIP)、5-羟基间苯二甲酸(5-OHH_2IP)在水热条件下合成了配合物[Cd(BEIP)(Cl)_2]_n(1)和[Zn(BEIP)(5-OHIP)]_n(2),并对其进行了元素分析、IR及X射线衍射法表征。晶体结构研究表明:配合物... 利用过渡金属镉(锌)盐与1,5-二(2-乙基咪唑)戊烷(BEIP)、5-羟基间苯二甲酸(5-OHH_2IP)在水热条件下合成了配合物[Cd(BEIP)(Cl)_2]_n(1)和[Zn(BEIP)(5-OHIP)]_n(2),并对其进行了元素分析、IR及X射线衍射法表征。晶体结构研究表明:配合物1属于正交晶系,Pca2_1空间群。配合物2属于单斜晶系,P21/n空间群,β=100.542(4)°。配合物1是由配体1,5-二(2-乙基咪唑)戊烷连接镉离子形成一维链状结构。而配合物2是由配体间苯二甲酸连接锌离子形成一维链状结构,该一维链通过1,5-二(2-乙基咪唑)戊烷连接成二维网络结构,进而通过氢键连接成三维超分子结构。此外,配合物1和2具有较高的稳定性和较好的荧光性能,配合物2对甲基橙染料有一定的降解作用。 展开更多
关键词 1 5-二(2-乙基咪唑)戊烷 晶体结构 荧光
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1-(5,5-二甲基-2-环己烯-1-酮-3-基)-戊-2-酮的合成
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作者 龙姝 杨华武 +3 位作者 陈雄 李传生 赵国玲 曹忠 《化学试剂》 CAS CSCD 北大核心 2010年第5期390-392,430,共4页
以α-异佛尔酮为原料,在氯化锌和己二酸存在下,尝试合成氧代二氢大马酮香料,却意外得到了氧代二氢大马酮的一个异构体,即标题化合物,用气相色谱-质谱和核磁共振谱进行了结构表征,并研究优化了合成此化合物的工艺条件,即使用无水氯化锌... 以α-异佛尔酮为原料,在氯化锌和己二酸存在下,尝试合成氧代二氢大马酮香料,却意外得到了氧代二氢大马酮的一个异构体,即标题化合物,用气相色谱-质谱和核磁共振谱进行了结构表征,并研究优化了合成此化合物的工艺条件,即使用无水氯化锌、最佳反应温度为145℃、最佳反应时间为8h。 展开更多
关键词 氧代二氢大马酮 1-(5 5-二甲基-2-环己烯-1-酮-3-基)-戊-2-酮 合成工艺 合成香料
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SO_4^(2-)/Zr-SBA-15介孔材料的合成及其催化性能 被引量:5
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作者 焦卫勇 李福祥 +2 位作者 周梅梅 李瑞丰 谢克昌 《石油化工》 CAS CSCD 北大核心 2010年第6期620-624,共5页
在乙醇蒸气中以硝酸锆为原料,用浸渍晶化法合成了一系列Zr-SBA-15介孔分子筛,并采用XRD、N2吸附-脱附、元素分析和吡啶吸附红外光谱法对其进行了表征。表征结果显示,Zr-SBA-15分子筛孔道规整,ZrO2呈四方相,当n(Zr)∶n(Si)=1.34时,ZrO2... 在乙醇蒸气中以硝酸锆为原料,用浸渍晶化法合成了一系列Zr-SBA-15介孔分子筛,并采用XRD、N2吸附-脱附、元素分析和吡啶吸附红外光谱法对其进行了表征。表征结果显示,Zr-SBA-15分子筛孔道规整,ZrO2呈四方相,当n(Zr)∶n(Si)=1.34时,ZrO2质量分数达50.53%,比表面积为356m2/g。用硫酸浸渍Zr-SBA-15分子筛制得SO42-/Zr-SBA-15介孔固体超强酸,它同时具有L酸和B酸中心,且L酸量较大。以正戊烷异构化为探针反应评价了SO42-/Zr-SBA-15的催化活性,在35℃、SO42-/Zr-SBA-15(n(Zr)∶n(Si)=2.15)用量0.5g、正戊烷25μL的条件下反应3h,正戊烷转化率高达46.6%。 展开更多
关键词 浸渍晶化 氧化锆 介孔材料 固体超强酸 SO42-/Zr-SBA-15催化剂 正戊烷异构化
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水对SO_4^(2-)/ZrO_2型固体超强酸催化正戊烷异构化反应的影响 被引量:4
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作者 张锐 刘耀芳 《石油与天然气化工》 CAS CSCD 北大核心 2000年第2期53-55,共3页
本文从不同角度考察了水对SO2 -4 /ZrO2 催化正戊烷反应的影响。研究发现 ,少量水对催化剂有减活作用 ,但有可逆性 ,可以通过干燥气体吹扫重新恢复活性 ;反应中微量水对催化剂活性的影响 ,可以通过提高反应温度来消除 ;反应系统中存在... 本文从不同角度考察了水对SO2 -4 /ZrO2 催化正戊烷反应的影响。研究发现 ,少量水对催化剂有减活作用 ,但有可逆性 ,可以通过干燥气体吹扫重新恢复活性 ;反应中微量水对催化剂活性的影响 ,可以通过提高反应温度来消除 ;反应系统中存在大量水时 ,可以使催化剂的活性完全丧失 ,其原因是水降低了具有异构化活性的酸中心的强度 ,从而导致了失活。 展开更多
关键词 固体超强酸 正戊烷 催化 异构化
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Preparation, Characterization and Catalytic Properties of S_2O_8^(2-)/ZrO_2 Supported by Tungsten Carbide 被引量:2
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作者 XUEHua-xin CHENJian-min 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2004年第1期68-72,共5页
A WC-supported S_2O 2-_8/ZrO_2(PSZ) catalyst was prepared and characterized by means of XRD, BET, FTIR and XPS. The isomerization of n-pentane over the catalyst was investigated as well. The results show that the s... A WC-supported S_2O 2-_8/ZrO_2(PSZ) catalyst was prepared and characterized by means of XRD, BET, FTIR and XPS. The isomerization of n-pentane over the catalyst was investigated as well. The results show that the skeletal isomerization and the crack of n-pentane proceed simultaneously on WC-supported S_2O 2-_8/ZrO_2 catalyst. The addition of tungsten carbide showed a significant enhancement in the activity and stability of the catalyst for n-pentane isomerization. The catalyst showed evidently a better activity than S_2O 2-_8/ZrO_2 supported by Pt and WO_3. The results can be interpreted by the existence of the tungsten oxycarbide compound(WC_xO_y) with carbidic, oxide and acidic sites. 展开更多
关键词 N-pentane ISOMERIZATION S_2O 2-_8/ZrO_2 Tungsten carbide
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柔性1,5⁃二(2⁃甲基咪唑)戊烷配体构筑的两种锌配合物的合成、结构及性质 被引量:1
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作者 张春华 王莹 +2 位作者 唐海军 邓奕芳 陈满生 《无机化学学报》 SCIE CAS CSCD 北大核心 2020年第11期2197-2204,共8页
利用过渡金属锌盐与1,5⁃二(2⁃甲基咪唑)戊烷(BMIP)、5⁃羟基(或5⁃溴)间苯二甲酸(5⁃OHH2IP或5⁃BrH2IP)在水热条件下合成了配合物[Zn(5⁃OHIP)(BMIP)]n(1)和[Zn(5⁃BrIP)(BMIP)]n(2)(BMIP=1,5⁃二(2⁃甲基咪唑)戊烷,5⁃OHIP=5⁃羟基间苯二甲酸根,... 利用过渡金属锌盐与1,5⁃二(2⁃甲基咪唑)戊烷(BMIP)、5⁃羟基(或5⁃溴)间苯二甲酸(5⁃OHH2IP或5⁃BrH2IP)在水热条件下合成了配合物[Zn(5⁃OHIP)(BMIP)]n(1)和[Zn(5⁃BrIP)(BMIP)]n(2)(BMIP=1,5⁃二(2⁃甲基咪唑)戊烷,5⁃OHIP=5⁃羟基间苯二甲酸根,5⁃BrIP=5⁃溴间苯二甲酸根),对其进行了红外、元素分析表征并用单晶X射线衍射确定了其结构。晶体结构研究表明:配合物1属于单斜晶系,P21/n空间群,β角为101.363(10)°。配合物1是由配体5⁃羟基间苯二甲酸连接锌离子形成一维链状结构,然后由1,5⁃二(2⁃甲基咪唑)戊烷将其连接成二维网络结构。配合物2是由配体5⁃溴间苯二甲酸和1,5⁃二(2⁃甲基咪唑)戊烷连接锌离子形成二维层状结构,由另一方向的1,5⁃二(2⁃甲基咪唑)戊烷连接成三维层柱状结构,最终形成三重贯穿网络结构。此外,研究了配合物1和2的荧光和光降解亚甲基蓝性能,结果表明配合物1和2对亚甲基蓝染料均有较好的降解作用。 展开更多
关键词 1 5⁃二(2⁃甲基咪唑)戊烷 晶体结构 荧光 降解
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Synthesis and Structure of Chromium Complexes with New Tetradentate Schiff Base N202-Type Ligand
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《Journal of Chemistry and Chemical Engineering》 2012年第3期259-262,共4页
In this research two chromium(II][) and (VI) complexes of tetradentate Schiff bases have been prepared by condensing of salicylaldehyde with 4-methyl 1,2-phenylenediamine. Schiff base complexes of chromium(Ill) ... In this research two chromium(II][) and (VI) complexes of tetradentate Schiff bases have been prepared by condensing of salicylaldehyde with 4-methyl 1,2-phenylenediamine. Schiff base complexes of chromium(Ill) have been employed to design and synthesize polynuclear complexes. So they have played an important role in molecular magnetism. Synthesized complexes were characterized by elemental analysis, IR, molar conductivity and NMR. The free ligands were alsc characterized by 1H, 13C NMR spectra. The 13C NMR and IR spectra of free ligand and the complexes are compared and discussed. 展开更多
关键词 Tetradentate Schiffbase chromium(VI) SALICYLALDEHYDE 4-methyl 1 2-phenylene diamine.
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