摘要
采用挤条法制备了一系列以Al_2O_3为黏结剂的Pt-WO3/ZrO2/Al_2O_3(PtWZA)催化剂,在微型固定床装置上评价了正庚烷在PtWZA上的异构化性能。主要考察了黏结剂Al_2O_3质量分数、WO3质量分数和焙烧温度对PtWZA催化剂物化性质和异构化性能的影响,并采用XRD、氮气吸附-脱附、Py-FTIR等手段对催化剂的晶相结构、比表面积和酸性进行了表征。结果表明:Al_2O_3的引入明显影响催化剂的异构化活性,且对活性的影响不仅与Al_2O_3质量分数有关,而且与WO3质量分数也紧密相关。对于含较低WO3质量分数的Pt15WZA而言,添加少量Al_2O_3(质量分数为2%)导致催化活性大幅度提高;而WO3质量分数提高到20%时,添加质量分数为2%的Al_2O_3对Pt20WZA的活性影响不大。当Al_2O_3的质量分数提高到15%时,Pt15WZA与Pt20WZA的活性大大下降。提高WO3质量分数显著提高了PtWZ15A的异构化活性。升高焙烧温度有利于提高Pt20WZ10A催化剂活性,过高的焙烧温度导致催化剂活性大幅度下降,较为适宜的温度为800～850℃。
A series of Pt-WO3/ZrO2/Al2O3(PtWZA)catalysts were prepared by extrusion method using Al2O3as a binder.The isomerization performance of n-heptane by PtWZA catalysts was evaluated on a micro-fixed bed reactor.The influence of Al2O3mass fraction,WO3mass fraction and calcination temperature on the physico-chemical properties and isomerization performance of PtWZA catalysts were studied.The crystalline structure,specific surface area and acidity of catalysts were determined by XRD、nitrogen adsorption-desorption and Py-FTIR,respectively.The results indicated that the addition of proper amount of Al2O3had a significant effect on the isomerization performance for PtWZA catalysts.However,the effect of the catalytic performance on the isomerisation activity is not only related to the mass fraction of Al2O3,but also to the mass fraction of WO3.The catalytic activity was greatly enhanced when small mass fraction(2%)of Al2O3was introduced into PtWZA catalysts for a low mass fraction(15%)of WO3.However,the catalytic activity increased slightly when small amount of Al2O3was introduced into Pt20WZ catalysts.The n-heptane isomerization activity of Pt15WZA and Pt20WZA catalysts greatly decreased with15%Al2O3mass fraction.The isomerization activity of PtWZ15A catalysts increased significantly when the mass fraction of WO3increased.The enhancement in the calcination temperature led to an appreciable improvement in the catalytic activity of Pt20WZ10A catalysts.High calcination temperature resulted in the decrease of isomerisation activity.The suitable calcination temperature of Pt20WZ10A catalysts is in the range of800-850℃.
作者
章红艳
宋月芹
王昭晖
周晓龙
陈丽芳
ZHANG Hong-yan;SONG Yue-qin;WANG Zhao-hui;ZHOU Xiao-long;CHEN Li-fang(Research Insititute of Petroleum Processing,East China University of Science and Technology,Shanghai 200237,China;Escuela Superior de Ingeniería Química e Industrias Extractivas,Industituto Politécnico Nacional Col. Zacatenco,México D.F 07738,México)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期807-815,共9页
Journal of East China University of Science and Technology
基金
国家自然科学基金项目(21103049)
作者简介
章红艳(1994-),女,安徽滁州人,硕士生,研究方向为多相催化及燃料的清洁化。E-mail:1163125656@qq.com;通信联系人:宋月芹,E-mail:songyueqin@ecust.edu.cn
