铂含量对微乳液法负载铂固体超强酸的特性及异构化性能的影响  

Effect of Pt content on characteristics and isomerization activity of solid superacid catalyst loaded Pt by microemulsion method

作　　者：牛瑞霞[1] 宋华林[2] 李锋[1] 张娇静[1] 柳艳修[1] 石洋[1] 宋华[1] 

机构地区：[1]东北石油大学石油与天然气化工省高校重点实验室,黑龙江大庆163318 [2]牡丹江医学院黑龙江省高校肿瘤疾病防治重点实验室,黑龙江牡丹江157011

出　　处：《中国石油大学学报（自然科学版）》2013年第4期175-180,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油天然气股份有限公司科技风险创新研究项目(07-06D-01-04-03-02)

摘　　要：采用反相微乳液法负载Pt制备出一系列Pt含量不同的Pt-S2O82-/ZrO2-Al2O3(Pt-SZA)固体超强酸催化剂,采用FT-IR、BET、TPR、TG-DTA、XRD和TEM等手段对催化剂进行表征,并考察Pt含量对正戊烷异构化催化活性的影响。结果表明,微乳液法制备的Pt-SZA-0.1催化剂中Pt粒子的粒径为4.5 nm,且其粒径分布较为均一,适量Pt的加入可以增加SZA催化剂的酸强度,提高催化剂的比表面积和热稳定性,降低还原温度;在反应温度230℃、反应压力2.0 MPa、氢烃摩尔比4∶1、质量空速1.0 h-1时Pt-SZA-0.1催化剂的异戊烷产率可达60.8%,选择性为95.2%。A series of Pt-S2O8^2-/ZrO2-Al2O3 （Pt-SZA） solid superacid catalyst were prepared by reverse microemulsion meth-od. The catalysts were characterized by means of FF-IR, BET, TPR, TG-DTA, XRD and TEM, and the effect of the Pt con- tent on the catalytic activity of Pt-SZA for n-pentane isomerization was investigated. The results show that the Pt particle size of Pt-SZA-0. 1 prepared by microemulsion method is 4. 5 nm, and the particle diameters distribute uniformly. The proper Pt addition to SZA can improve the acid strength, the specific surface area, thermal stability of the catalyst obviously and reduce the reduction temperature. Under the conditions of 230 ℃, 2. 0 MPa, hydrogen/hydrocarbon molar ratio of 4 ： 1 and weight hourly space velocity （WHSV） of 1.0 h^-1 , the isopentane yield and selectivity of Pt-SZA-0. 1ean reach 60. 8% and 95.2%, respectively.

关 键 词：催化剂 固体超强酸 微乳液 异构化 Pt含量 

分 类 号：O643.3[理学—物理化学]