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Enhanced hydrodeoxygenation of lignin-derived anisole to arenes catalyzed by Mn-doped Cu/Al_(2)O_(3)
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作者 Xiaofei Wang Shixiang Feng +4 位作者 Yue Wang Yujun Zhao Shouying Huang Shengping Wang Xinbin Ma 《Green Energy & Environment》 SCIE EI CAS CSCD 2023年第3期927-937,共11页
Lignin is a renewable carbon resource to produce arenes due to its abundant aromatic structures.For the liquid-phase hydrodeoxygenation(HDO)based on metallic catalysts,the preservation of aromatic rings in lignin or i... Lignin is a renewable carbon resource to produce arenes due to its abundant aromatic structures.For the liquid-phase hydrodeoxygenation(HDO)based on metallic catalysts,the preservation of aromatic rings in lignin or its derivatives remains a challenge.Herein,we synthesized Mndoped Cu/Al_(2)O_(3) catalysts from layered double hydroxides(LDHs)for liquid-phase HDO of lignin-derived anisole.Mn doping significantly enhanced the selective deoxygenation of anisole to arenes and inhibited the saturated hydrogenation on Cu/Al_(2)O_(3).With Mn doping increasing,the surface of Cu particles was modified with MnO_(x) along with enhanced generation of oxygen vacancies(Ov).The evolution of active sites structure led to a controllable adsorption geometry of anisole,which was beneficial for increasing arenes selectivity.As a result,the arenes selectivity obtained on 4Cu/8Mn4AlO_(x) was increased to be more than 6 folds of that value on 4Cu/4Al_(2)O_(3) over the synergistic sites between metal Cu and Ov generated on MnO_(x). 展开更多
关键词 anisole HYDRODEOXYGENATION Oxygen vacancy ARENES Metal oxide
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Intrinsic kinetics of catalytic hydrogenation of 2-nitro-4-acetylamino anisole to 2-amino-4-acetylamino anisole over Raney nickel catalyst
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作者 Xiangyang Cui Xin Zhang +5 位作者 Baoju Wang Yuqi Sun Haikui Zou Guangwen Chu Yong Luo Jianfeng Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第12期1-8,共8页
The catalytic hydrogenation of 2-nitro-4-acetylamino anisole(NMA)is a less-polluting and efficient method to produce 2-amino-4-acetamino anisole(AMA).However,the kinetics of catalytic hydrogenation of NMA to AMA remai... The catalytic hydrogenation of 2-nitro-4-acetylamino anisole(NMA)is a less-polluting and efficient method to produce 2-amino-4-acetamino anisole(AMA).However,the kinetics of catalytic hydrogenation of NMA to AMA remains obscure.In this work,the kinetic models including power-law model and Langmuir-Hinshelwood-Hougen-Watson(LHHW)model of NMA hydrogenation to AMA catalyzed by Raney nickel catalyst were investigated.All experiments were carried out under the elimination of mass transfer resistance within the temperature range of 70–100°C and the hydrogen pressure of 0.8–1.5 MPa.The reaction was found to follow 0.52-order kinetics with respect to the NMA concentration and 1.10-order kinetics in terms of hydrogen pressure.Based on the LHHW model,the dual-site dissociation adsorption of hydrogen was analyzed to be the rate determining step.The research of intrinsic kinetics of NMA to AMA provides the guidance for the reactor design and inspires the catalyst modification. 展开更多
关键词 Intrinsic kinetics 2-nitro-4-acetylamino anisole Catalytic hydrogenation Raney nickel catalyst
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Synthesis of anisole by vapor phase methylation of phenol with methanol over catalysts supported on activated alumina 被引量:8
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作者 党丹 王泽 +1 位作者 林伟刚 宋文立 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第5期720-726,共7页
The synthesis of anisole by vapor phase methylation of phenol with methanol over activated alumina(AA) supported catalysts was investigated in a fixed bed reactor. KH2PO4/AA gave the best performance among the eight... The synthesis of anisole by vapor phase methylation of phenol with methanol over activated alumina(AA) supported catalysts was investigated in a fixed bed reactor. KH2PO4/AA gave the best performance among the eight tested catalysts. The catalyst was prepared by loading KH2PO4 on AA and then calcining at the optimized temperature of 700 °C for 8 h. In the vapor phase reaction, the level of anisole yield(LAY) has a maximum at 400–450 °C when the temperature varied from 300 to 500°C, which decreased slightly with increasing WHSV and increased distinctly with increasing mole fraction of methanol. On comparing O‐methylation and C‐methylation of phenol, a low temperature,high WHSV(short residence time), and a low methanol concentration over the KH2PO4/AA catalyst with higher K contents were found to increase anisole selectivity by O‐methylation of phenol. The reaction routes to the major products and the catalytic mechanism were suggested, and a ‘K‐acid'bifunctional process may be a critical factor to the formation of anisole. 展开更多
关键词 PHENOL METHANOL CATALYSIS anisole METHYLATION
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Hydrodeoxygenation of Anisole over Ni/α-Al2O3 Catalyst 被引量:1
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作者 汤文武 张兴华 +2 位作者 张琦 王铁军 马隆龙 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2016年第5期617-622,I0002,共7页
Ni-based catalysts supported on di erent supports (α-Al2O3,γ-Al2O3, SiO2, TiO2, and ZrO2) were prepared by impregnation. Effects of supports on catalytic performance were tested using hydrodeoxygenation reaction ... Ni-based catalysts supported on di erent supports (α-Al2O3,γ-Al2O3, SiO2, TiO2, and ZrO2) were prepared by impregnation. Effects of supports on catalytic performance were tested using hydrodeoxygenation reaction (HDO) of anisole as model reaction. Ni/α-Al2O3 was found to be the highest active catalyst for HDO of anisole. Under the optimal conditions, the anisole conversion is 93.25% and the hydrocarbon yield is 90.47%. Catalyst characteriza-tion using H2-TPD method demonstrates that Ni/α-Al2O3 catalyst possesses more amount of active metal Ni than those of other investigated catalysts, which can enhance the cat-alytic activity for hydrogenation. Furthermore, it is found that the Ni/α-Al2O3 catalyst has excellent repeatability, and the carbon deposited on the surface of catalyst is negligible. 展开更多
关键词 anisole HYDRODEOXYGENATION Ni/α-Al2O3 Hydrocarbons
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Effects of Current upon Electrochemical Catalytic Reforming of Anisole
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作者 熊佳星 阚涛 +2 位作者 李兴龙 叶同奇 李全新 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第6期693-700,746,共9页
The reforming of anisole (as model compound of bio-oil) was performed over the NiCuZn-Al2O3 catalyst, using a recently-developed electrochemical catalytic reforming (ECR). The influence of-the current on the aniso... The reforming of anisole (as model compound of bio-oil) was performed over the NiCuZn-Al2O3 catalyst, using a recently-developed electrochemical catalytic reforming (ECR). The influence of-the current on the anisole reforming in the ECR process has been investigated. It was observed that anisole reforming was significantly enhanced by the current approached over the catalyst in the electrochemical catalytic process, which was due to the non-uniform temperature distribution in the catalytic bed and the role of the thermal electrons originating from the electrified wire. The maximum hydrogen yield of 88.7% with a carbon conversion of 98.3% was obtained through the ECR reforming of anisole at 700℃ and 4 A. X-ray diffraction was employed to characterize catalyst features and their alterations in the anisole reforming. The apparent activation energy for the anisole reforming is calculated as 99.54 kJ/mol, which is higher than ethanol, acetic acid, and light fraction of bio-oil. It should owe to different physical and chemical properties and reforming mechanism for different hydrocarbons. 展开更多
关键词 HYDROGEN anisole NiCuZn-Al2O3 Electrochemical catalytic reforming
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Catalytic Acylation of Anisole over Some Zeolites 被引量:1
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作者 ZHAO Zhen hua (College of Chemistry and Chemical Technology, Hunan Normal University, Changsha 410081, P. R. China) (Received Sept. 22, 1999) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2000年第3期191-197,共7页
Methoxyacetophenone(4 MAP) was synthesized by the acylation of anisole with acetic anhydride in the presence of HY zeolite. The addition of an appropriate amount of some solvent such as dichloromethane, chloroform, c... Methoxyacetophenone(4 MAP) was synthesized by the acylation of anisole with acetic anhydride in the presence of HY zeolite. The addition of an appropriate amount of some solvent such as dichloromethane, chloroform, carbon disulfide or chlorobenzene to the reaction system can improve the yield of the acylated product to a certain extent. HY zeolite used can be recovered, and reused after being regenerated, obtaining almost the same yield of 4 MAP as the fresh zeolite. 展开更多
关键词 ACYLATION HY zeolite CATALYST anisole Acetic anhydride SYNTHESIS Aromatic ketone
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ZEOLITE-CATALYZED FRIEDEL-CRAFTS ACYLATION OF AROMATICS:I》.SYNTHESIS OF 4-ACYL ANISOLE WITH A HY CATALYST 被引量:1
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作者 Qi Long WANG Yu Dao MA +1 位作者 Xing Dong JI Hao YAN(Department of Chemistry,Shandong University,Jinan, 250100)and Qin QIU(Department of Environmental Engineering,Shandong University.,Jinan, 250100) 《Chinese Chemical Letters》 SCIE CAS CSCD 1996年第2期99-102,共4页
A series of aromatic ketones 4-acyl anisole were synthesized with high yield by using carboxylic acids as acylating agents and a HY zeolite as catalyst.
关键词 HY CATALYST WITH anisole ACYLATION ACYL
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Effects of indium on Ni/SiO_2 catalytic performance in hydrodeoxygenation of anisole as model bio-oil compound: Suppression of benzene ring hydrogenation and C–C bond hydrogenolysis 被引量:1
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作者 Xiaofei Wang Jixiang Chen 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第11期1818-1830,共13页
SiO2‐supported monometallic Ni and bimetallic Ni‐In catalysts were prepared and used for hydrodeoxygenation of anisole,which was used as a model bio‐oil compound,for BTX(benzene,toluene,and xylene)production.The ef... SiO2‐supported monometallic Ni and bimetallic Ni‐In catalysts were prepared and used for hydrodeoxygenation of anisole,which was used as a model bio‐oil compound,for BTX(benzene,toluene,and xylene)production.The effects of the Ni/In ratio and Ni content on the structures and performances of the catalysts were investigated.The results show that In atoms were incorporated into the Ni metal lattice.Although the Ni‐In bimetallic crystallites were similar in size to those of monometallic Ni at the same Ni content,H2uptake by the bimetallic Ni‐In catalyst was much lower than that by monometallic Ni because of dilution of Ni atoms by In atoms.Charge transfer from In to Ni was observed for the bimetallic Ni‐In catalysts.All the results indicate intimate contact between Ni and In atoms,and the In atoms geometrically and electronically modified the Ni atoms.In the hydrodeoxygenation of anisole,although the activities of the Ni‐In bimetallic catalysts in the conversion of anisole were lower than that of the monometallic Ni catalyst,they gave higher selectivities for BTX and cyclohexane as a result of suppression of benzene ring hydrogenation and C–C bond hydrogenolysis.They also showed lower methanation activity.These results will be useful for enhancing carbon yields and reducing H2consumption.In addition,the lower the Ni/In ratio was,the greater was the effect of In on the catalytic performance.The selectivity for BTX was primarily determined by the Ni/In ratio and was little affected by the Ni content.We suggest that the performance of the Ni‐In bimetallic catalyst can be ascribed to the geometric and electronic effects of In. 展开更多
关键词 Ni‐In bimetallic catalyst HYDRODEOXYGENATION C–C bond hydrogenolysis anisole BTX
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Hydrodeoxygenation of anisole over different Rh surfaces
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作者 Nhung N. Duong Darius Aruho +1 位作者 Bin Wang Daniel E. Resasco 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1721-1730,共10页
The cleavage of the alkoxy(Ar-O-R) ether bond present in anisole is an interesting hydrodeoxygenation(HDO) reaction, since this asymmetric group contains two different C–O bonds, Caryl–O or Calkyl–O, which could po... The cleavage of the alkoxy(Ar-O-R) ether bond present in anisole is an interesting hydrodeoxygenation(HDO) reaction, since this asymmetric group contains two different C–O bonds, Caryl–O or Calkyl–O, which could potentially cleave. Recent work on the HDO of anisole over Pt, Ru, and Fe catalysts has shown that a common phenoxy surface intermediate is formed on all three metals. The subsequent reaction path of this intermediate varies from metal to metal, depending on the metal oxophilicity. Over the less oxophilic Pt, phenol is the only primary product. By contrast, on the more oxophilic Fe catalyst, the sole primary product is benzene instead of phenol. On Ru, with intermediate oxophilicity, both benzene and phenol are primary products. In this contribution, we have investigated Rh catalysts of varying surface nanostructures. A combination of experimental measurements and computational calculations was used to explore the effects of varying metal coordination number, an additional parameter that can be used to control the oxophilicity of a metal. The results confirm that metal oxophilicity is a good descriptor for HDO performance of metal catalysts and it can be controlled via selection of metal type and/or metal extent of coordination. Small Rh metal clusters with low coordination metal sites are more active for the deoxygenation pathway but also quickly deactivated while large clusters with high coordination sites are more active toward hydrogenation and more stable. 展开更多
关键词 HYDRODEOXYGENATION anisole ALKOXY Oxophilicity PHENOLIC Surface defects
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GROWTH OF o-DICYANOVINYL ANISOLE(DIVA) CRYSTAL IN ORGANIC SOLVENTS
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作者 Bu Guo WANG, Cheng YE, Hui Fang ZHANG, Zhi Ming FENG aResearch Institute of Synthetic Crystals, Beijing 100018, bInstitute of Chemistry, Chinese Academy of Sciences, Beijing 100080 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第11期1013-1016,共4页
Crystal growth habits of O-Dicyanovinyl anisole (DIVA) in organic solvents are described
关键词 DIVA CRYSTAL IN ORGANIC SOLVENTS GROWTH OF o-DICYANOVINYL anisole
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An efficient bifunctional Ni-Nb_(2)O_(5)nanocatalysts for the hydrodeoxygenation of anisole
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作者 Juan Xu Ping Zhu +9 位作者 Islam HEl Azab Ben Bin Xu Zhanhu Guo Ashraf YElnaggar Gaber AMMersal Xiangyi Liu Yunfei Zhi Zhiping Lin Hassan Algadi Shaoyun Shan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第9期187-197,共11页
The Ni-Nb_(2)O_(5)nanocatalysts have been prepared by the solgel method,and the catalytic hydrodeoxygenation(HDO)performance of anisole as model compound is studied.The results show that Nb exists as amorphous Nb_(2)O... The Ni-Nb_(2)O_(5)nanocatalysts have been prepared by the solgel method,and the catalytic hydrodeoxygenation(HDO)performance of anisole as model compound is studied.The results show that Nb exists as amorphous Nb_(2)O_(5)species,which can promote Ni dispersion.The addition of Nb_(2)O_(5)increases the acidity of the catalyst.However,when the content of niobium is high,there is an inactive Nb-Ni-O mixed phase.The size and morphology of Ni grains in catalysts are different due to the difference of Nb/Ni molar ratio.The Ni_(0.9)Nb_(0.1)sample has the largest surface area of 170.8 m^(2)·g^(-1)among the catalysts prepared in different Nb/Ni molar ratios,which is mainly composed of spherical nanoparticles and crack pores.The HDO of anisole follows the reaction route of the hydrogenation HYD route.The Ni_(0.9)Nb_(0.1)catalyst displayed a higher HDO performance for anisole than Ni catalyst.The selectivity to cyclohexane over the Ni_(0.9)Nb_(0.1)sample is about 10 times that of Ni catalyst at 220℃and 3 MPa H_(2).The selectivity of cyclohexane is increased with the increase of reaction temperature.The anisole is almost completely transformed into cyclohexane at 240℃,3 MPa H_(2)and 4 h. 展开更多
关键词 Hydrodeoxygenation(HDO) Catalysts Ni-Nb_(2)O_(5) Solgel method anisole
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Design and optimization of a greener sinomenine hydrochloride preparation process considering variations among different batches of the medicinal herb 被引量:1
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作者 Dandan Ren Jiale Xie +2 位作者 Tianle Chen Haibin Qu Xingchu Gong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第7期77-90,共14页
The current methods used to industrially produce sinomenine hydrochloride involve several issues,including high solvent toxicity,long process flow,and low atomic utilization efficiency,and the greenness scores of the ... The current methods used to industrially produce sinomenine hydrochloride involve several issues,including high solvent toxicity,long process flow,and low atomic utilization efficiency,and the greenness scores of the processes are below 65 points.To solve these problems,a new process using anisole as the extractant was proposed.Anisole exhibits high selectivity for sinomenine and can be connected to the subsequent water-washing steps.After alkalization of the medicinal material,heating extraction,water washing,and acidification crystallization were carried out.The process was modeled and optimized.The design space was constructed.The recommended operating ranges for the critical process parameters were 3.0–4.0 h for alkalization time,60.0–80.0℃ for extraction temperature,2.0–3.0(volume ratio)for washing solution amount,and 2.0–2.4 mol·L^(-1) for hydrochloric acid concentration.The new process shows good robustness because different batches of medicinal materials did not greatly impact crystal purity or sinomenine transfer rate.The sinomenine transfer rate was about 20%higher than that of industrial processes.The greenness score increased to 90 points since the novel process proposed in this research solves the problems of long process flow,high solvent toxicity,and poor atomic economy,better aligning with the concept of green chemistry. 展开更多
关键词 Sinomenine hydrochloride Process optimization anisole
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三氟化硼-苯甲醚络合物的管式裂解工艺研究
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作者 李瑜哲 宗睿 吴高胜 《现代化工》 CAS CSCD 北大核心 2024年第S01期145-148,共4页
以三氟化硼-苯甲醚络合物为原料,采用管式裂解工艺,考察了裂解温度、停留时间以及预热温度对裂解反应的影响。采用气质联用仪定性分析了裂解后产物中的杂质,采用气相色谱外标法定量分析了各主要杂质的含量。通过研究获得了较优的管式裂... 以三氟化硼-苯甲醚络合物为原料,采用管式裂解工艺,考察了裂解温度、停留时间以及预热温度对裂解反应的影响。采用气质联用仪定性分析了裂解后产物中的杂质,采用气相色谱外标法定量分析了各主要杂质的含量。通过研究获得了较优的管式裂解工艺参数,其中预热温度为40℃,裂解温度为185℃,停留时间为120 s,裂解率最高达到98.06%。 展开更多
关键词 三氟化硼 苯甲醚 络合物 管式裂解 工艺
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顶空固相微萃取-气相色谱质谱法测定水体中的苯甲醚
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作者 许雪姣 《环境监控与预警》 2024年第1期64-67,共4页
建立了顶空固相微萃取-气相色谱质谱法定性定量检测水中苯甲醚的分析方法。对影响检测结果的因素如萃取头的选择、萃取时间等进行了优化。经过条件优化,方法在1~1000μg/L范围内线性良好,线性相关系数>0.999,实际水样加标质量浓度分... 建立了顶空固相微萃取-气相色谱质谱法定性定量检测水中苯甲醚的分析方法。对影响检测结果的因素如萃取头的选择、萃取时间等进行了优化。经过条件优化,方法在1~1000μg/L范围内线性良好,线性相关系数>0.999,实际水样加标质量浓度分别为10,60,300μg/L时,加标回收率为85%~120%,相对标准偏差(RSD)为3.95%~6.72%。全扫描模式下,苯甲醚的检出限为0.3μg/L。实验结果表明,该方法快速、简便、灵敏度高,方法精密度和准确度均能满足水中微量及痕量苯甲醚检测的要求。 展开更多
关键词 苯甲醚 液液萃取 吹扫捕集 固相微萃取 气相色谱质谱
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4-甲基苯甲醚催化氧化产物的液相色谱分析
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作者 赵霞榕 李敬 +4 位作者 宋红刚 冯志强 赵心如 汪敦佳 范玲 《化工技术与开发》 CAS 2024年第11期61-65,86,共6页
4-甲基苯甲醚的催化氧化产物主要有4-甲氧基苯甲醇、4-甲氧基苯甲醛、4-甲氧基苯甲酸、4-甲氧基苄基乙酸酯等。本文采用高效液相色谱法,通过C_(18)反相色谱柱和二极管阵列检测器,确定上述各催化氧化产物同时存在时,紫外检测波长为198nm... 4-甲基苯甲醚的催化氧化产物主要有4-甲氧基苯甲醇、4-甲氧基苯甲醛、4-甲氧基苯甲酸、4-甲氧基苄基乙酸酯等。本文采用高效液相色谱法,通过C_(18)反相色谱柱和二极管阵列检测器,确定上述各催化氧化产物同时存在时,紫外检测波长为198nm时各物质的吸收情况最优。对流动相组成、流动相比例、流速、柱温等色谱条件进行筛选。将体积比为55∶45的乙腈-0.1%三氟乙酸水溶液的混合溶液作为流动相,流速为0.8mL·min^(-1)进行等梯度洗脱,检测柱温为20℃时,分离效果最佳。在此条件下对4-甲基苯甲醚的催化氧化产物进行跟踪检测,结果表明,催化氧化产物在0.01~0.2 mg·mL^(-1)范围内呈良好的线性关系,相关系数为0.99。该方法简单便捷,灵敏度高,重复性好,专属性高,结果稳定,是分析4-甲基苯甲醚催化氧化产物的理想方法。 展开更多
关键词 4-甲基苯甲醚 氧化产物 高效液相色谱法 定量分析
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DETECTION OF INTERMEDIATES IN REACTION BETWEEN N , N'-DI (P-METHYL) PHENYL MONOTHIOXAMIDES AND 1, 3-DIAMINE TRIMETHYLENE USING RAMAN SPECTROSCOPY
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作者 Xiao Kun HU Ren Ao GU +2 位作者 Zhang Fei HE Ke Qian CHEN Da Qing SUN 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第7期533-534,共2页
Reman spectroscopy is used as a tool to monitor the reaction between N,N'-di(pmethyl)monothioxamides and 1,3-diamine trimethylene and to detect the reaction intermediate. By observing changes of 1024 cm^(-1) C=S b... Reman spectroscopy is used as a tool to monitor the reaction between N,N'-di(pmethyl)monothioxamides and 1,3-diamine trimethylene and to detect the reaction intermediate. By observing changes of 1024 cm^(-1) C=S band and appearance of a new bend at around 1720 cm^(-1), the reaction mechanism is discussed. 展开更多
关键词 Figure p-methyl PHENYL MONOTHIOXAMIDES AND 1 DIAMINE TRIMETHYLENE USING RAMAN SPECTROSCOPY DETECTION OF INTERMEDIATES IN REACTION BETWEEN N
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高效液相色谱法测定邻氨基苯甲醚产品或反应液中7种组分的质量分数 被引量:1
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作者 王艳 王瑞菲 +2 位作者 刘友彬 纪晓红 岳涛 《当代化工》 CAS 2023年第2期501-504,共4页
建立了高效液相色谱法同时测定邻氨基苯甲醚合成工艺中邻氨基苯酚、对氨基苯甲醚、苯胺、对氨基苯酚、邻氨基苯甲醚、邻氨基苯乙醚和邻氯苯胺质量分数的方法。优化的色谱条件为:以Inert Sustain C18色谱柱(250 mm×4.6 mm,5μm)为... 建立了高效液相色谱法同时测定邻氨基苯甲醚合成工艺中邻氨基苯酚、对氨基苯甲醚、苯胺、对氨基苯酚、邻氨基苯甲醚、邻氨基苯乙醚和邻氯苯胺质量分数的方法。优化的色谱条件为:以Inert Sustain C18色谱柱(250 mm×4.6 mm,5μm)为分析柱,以磷酸二氢钾和甲醇为流动相,采用梯度洗脱方式分离待测物和其他杂质组分,在290 nm波长下以外标法定量。结果表明:各待测物与相邻组分的分离度大于1.5;主成分邻氨基苯甲醚和其他6种杂质组分分别在质量浓度为90.0~900.0 mg·L^(-1)、0.45~4.5 mg·L^(-1)内呈线性关系,加标回收率分别为99.0%~101.0%、98.0%~102.5%,测定值的相对标准偏差(n=3)为0.13%~5.0%. 展开更多
关键词 高效液相色谱法 邻氨基苯甲醚 中控分析 质量控制
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Ni/SiO_(2)催化剂催化2-硝基-4-乙酰胺基苯甲醚加氢性能研究
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作者 丁军委 王树森 +3 位作者 徐广文 唐培龙 尚鸿瑞 赵石磊 《青岛科技大学学报(自然科学版)》 CAS 2023年第1期27-34,共8页
Ni系催化剂具有原料丰富,价格低的优点,本研究将Ni负载在SiO_(2)表面,用于2-硝基-4-乙酰胺基苯甲醚(NMA)加氢反应。Ni/SiO_(2)催化剂采用溶胶-凝胶法制备,用BET、XRD、SEM、TEM、NH_(3)-TPD、H_(2)-TPR等表征技术对催化剂结构进行表征,... Ni系催化剂具有原料丰富,价格低的优点,本研究将Ni负载在SiO_(2)表面,用于2-硝基-4-乙酰胺基苯甲醚(NMA)加氢反应。Ni/SiO_(2)催化剂采用溶胶-凝胶法制备,用BET、XRD、SEM、TEM、NH_(3)-TPD、H_(2)-TPR等表征技术对催化剂结构进行表征,考察了加氢反应性能随催化剂结构、反应温度和压力变化规律。以商用雷尼镍催化剂作为对照,考察催化剂催化NMA加氢反应性能。研究结果表明:Ni负载量为30%时,Ni/SiO_(2)催化剂适量的酸性和Ni纳米粒子之间的协同作用使得Ni/SiO_(2)表现出最高的催化活性;在100℃、加氢压力1.8 MPa条件下反应2 h, NMA转化率达到100%,目标产物2-氨基-4-乙酰氨基苯甲醚(AMA)选择性超过99.3%。 展开更多
关键词 2-氨基-4-乙酰氨基苯甲醚 催化加氢 2-硝基-4-乙酰胺基苯甲醚
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NiCu-based catalysts for the low-temperature hydrodeoxygenation of anisole:Effect of the metal ratio on SiO_(2)andγ-Al_(2)O_(3)supports 被引量:1
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作者 Tom Vandevyvere Maarten K.Sabbe +2 位作者 Pedro S.F.Mendes Joris W.Thybaut Jeroen Lauwaert 《Green Carbon》 2023年第2期170-184,共15页
The effects of the metal ratio of NiCu catalysts on the low-temperature hydrodeoxygenation(HDO)of anisole were assessed on a neutral SiO_(2) and an acidicγ-Al_(2)O_(3) support.The activity of SiO_(2)-supported cataly... The effects of the metal ratio of NiCu catalysts on the low-temperature hydrodeoxygenation(HDO)of anisole were assessed on a neutral SiO_(2) and an acidicγ-Al_(2)O_(3) support.The activity of SiO_(2)-supported catalysts increases with the Ni content in the NiCu phase,related to Ni’s hydrogenation capacity.In contrast,on aγ-Al_(2)O_(3) support,the activity decreases with the Ni content.Overall,Al_(2)O_(3)-supported catalysts,exhibiting a smaller NiCu alloy particle size,are more active than SiO_(2)-supported ones.In terms of selectivity,SiO_(2)-supported catalysts mainly hydrogenate anisole to methoxycyclohexane,while,particularly at higher conversions,γ-Al_(2)O_(3)-supported catalysts are able to further convert methoxycyclohexane to cyclohexane,demonstrating the importance of acid sites for low-temperature HDO.The Ni/Cu ratio also steers the selectivity,but not the catalyst stability.Deactivation phenomena are only support dependent:while on SiO_(2)-supported catalysts,active site sintering occurs,attributed to weak stabilization of metal particles by the support,acid catalyzed coking is the main cause of deactivation on theγ-Al_(2)O_(3)-supported catalysts. 展开更多
关键词 BIO-OIL Pyrolysis-oil anisole HYDRODEOXYGENATION Bimetallic catalyst
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不同主产区小茴香药材质量评价 被引量:2
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作者 梁焕 安岳 《中国农学通报》 2023年第19期148-152,共5页
研究旨在全面了解全国各产地小茴香药材质量情况。在小茴香的7个主要产地设置采集21批药材样本,按照《中华人民共和国药典》方法测定其挥发油、反式茴香脑、5种重金属的含量和9种有机氯类农药残留量并进行分析评价。研究表明,小茴香药... 研究旨在全面了解全国各产地小茴香药材质量情况。在小茴香的7个主要产地设置采集21批药材样本,按照《中华人民共和国药典》方法测定其挥发油、反式茴香脑、5种重金属的含量和9种有机氯类农药残留量并进行分析评价。研究表明,小茴香药材质量状况良好,各产地小茴香的挥发油和反式茴香脑指标均高于药典要求,5种重金属含量低,9种有机氯类农药残留量未检出,符合中药材安全的要求。甘肃省玉门市产挥发油和反式茴香脑含量最高,甘肃省民勤县、海原县、景泰县,山西省朔州,内蒙古等5个产地小茴香的含量差异较小;且民勤县小茴香的挥发油含量高于其他产地,甘肃省金塔县最低。 展开更多
关键词 小茴香 产地 挥发油 反式茴香脑 重金属 农药残留量 质量评价
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