改性β沸石负载碳化钼催化剂上正己烷的异构化  

ISOMERIZATION OF n-HEXANE OVER MODIFIED ZEOLITE β SUPPORTED MOLYBDENUM CARBIDE CATALYST

作　　者：谷峰[1] 孟禹[1] 王海彦[1] 常勇[1,2,3] 

机构地区：[1]辽宁石油化工大学,抚顺113001 [2]中国石油大学(华东)化学化工学院 [3]沈阳工业大学石油化工学院

出　　处：《石油炼制与化工》2009年第3期42-46,共5页Petroleum Processing and Petrochemicals

基　　金：辽宁省教育厅科研项目(05L221)

摘　　要：通过碱溶液适度处理β沸石来增大其孔径,以(NH4)6Mo7O24.4H2O为钼源,以正己烷为碳源,制备了改性β沸石负载碳化钼催化剂。XRD,BET,FTIR分析结果表明,制备的改性β沸石具有高比表面积和大孔径,利用正己烷作为碳源得到了对异构化具有活性的β-Mo2C催化剂。以正己烷为模型反应物,考察了反应温度、压力、空速和氢烃比对β-Mo2C/β沸石催化剂临氢异构化反应性能的影响。结果表明,β沸石负载碳化钼催化剂上的正己烷异构化的最优反应条件为:反应温度265℃,反应压力1.5 MPa,体积空速1.0 h-1,氢烃体积比200。在该条件下,当正己烷转化率为80.97%时,异构化选择性和异构产物收率分别为72.53%和58.73%。Zeolite zeolite β supported moly molybdenum source and n was modified by alkaline solution to enlarge its pore size, and a modified enum carbide catalyst was prepared using （NH4）6Mo7O24 .4H2O as exane as carbon source. The characterization results of XRD, BET, FT-IR showed that the modified zeolite β possessed high specific surface area and large pore volume;an active β-Mo2C phase of isomerization was obtained by using n-hexane as the source of carburization. The influences of reaction conditions, such as temperature, pressure, space velocity and the hydrogen to hydrocarbon ratio, on the catalytic performance of n-hexane isomerization over β-Mo2C/β-zeolite were investigated. It was found that under the optimum conditions of a reaction temperature of 265 ℃, a reaction pressure of 1.5 MPa,LHSV of 1. 0 h^-1 and a hydrogen to hydrocarbon volume ratio of 200, when the conversion of n-hexane reached 80.97% ,the selectivity to isomers and the isomers yield were 72. 53% and 58.73% ,respectively.

关 键 词：异构化 碳化钼 正己烷 Β沸石 

分 类 号：O643.32[理学—物理化学]