摘要
采用浸渍法制备了系列 CrO_x/SiO_2催化剂样品,采用 XRD,FT-IR,UV-vis 分析手段对催化剂样品进行表征,考察催化剂上 CrO_x 负载量及反应条件对正丁烷催化脱氢反应性能的影响。结果表明,Cr 在 SiO_3表面主要以+3价及+6价的形式存在。当催化剂中 CrO_x质量分数为12%时,在反应温度590℃、氢气与正丁烷摩尔比为1.5～2.5、重时空速为1～2 h^(-1)的反应条件下可获得较高的正丁烷转化率及正丁烯选择性。产物正丁烯中1-丁烯与2-丁烯之比受反应温度影响最为明显,而与 CrO_x负载量、氢烃摩尔比及重时空速的关系不大。
A series dehydrogenation of n-butane of CrOx/SiO2 catalyst samples with were prepared by incipient wetness various CrOx loadings for catalytic impregnation method. The catalyst samples were characterized by XRD,FT-IR and UV-Vis techniques. It was found that the chromium on the silica surface existed in the form of Cr（Ⅲ） and Cr（Ⅵ） species. The test results showed that with a catalyst having a CrOx loading of 12%,under the optimum reaction conditions of a reaction temperature of 590 ℃,mole ratios of H2 to n-C4H10 of 1. 5--2. 5, and a WHSV between 1--2 h 1,relatively high n-butane conversion and n butene selectivity could be obtained. The ratio of 2-butene to 1-butene in the product was mainly influenced by the reaction temperature, the CrOx loading, ratio of hydrogen to n-butane and the WHSV had no significant influence.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2008年第7期41-46,共6页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金(20362008)
教育部新世纪优秀人才支持计划(NCET-04-0987)
新疆大学博士科研启动资金(BS060101)
关键词
正丁烷
氧化铬
二氧化硅
催化脱氢
丁烯
n-butane
chromium oxide
silicon dioxide
catalytic dehydrogenation
butene
