Pt/CeO_2催化分子氧氧化脱除异辛烷中有机硫化物的研究  

Studies on aerobic oxidative desulfurization of organic sulfur from isooctane over Pt/CeO_2 catalyst

作　　者：王亚[1] 高立达[1] 薛青松[1] 路勇[1] 

机构地区：[1]华东师范大学化学系上海市绿色化学与化工过程绿色化重点实验室,上海200062

出　　处：《工业催化》2009年第2期28-33,共6页Industrial Catalysis

基　　金：国家自然科学基金(20590366;20573036);国家高技术研究发展计划(863计划)(2007AA05Z101);新世纪优秀人才支持计划(06-NCET-0423);上海市曙光计划(06SG28);上海市重点学科建设项目(B409)

摘　　要：以空气作氧化剂,含硫1 000 g·g^(-1)的异辛烷为模型油,考察了Pt/CeO_2催化剂上反应温度、n(O_2):n(S)和空速对苯并噻吩氧化脱除的影响。结果表明,在300 ℃、n(O_2):n(S)=26.4和空速15.3 h^(-1)时,苯并噻吩脱除率达95%以上。300℃达到95%的硫脱除率时,Pt/CeO_2催化剂上不同硫化物的氧化脱除活性顺序为:正戊硫醇>叔丁基硫醚>苯并噻吩>噻吩>二苯并噻吩。反应后的油品及尾气经脉冲火焰光度监测器色谱(GC-PFPD)和色质联用仪(GC-MS)检测分析发现,SO_2是惟一含硫产物。在200 h的噻吩氧化反应测试中,转化率一直保持在95%,O_2利用率约40%,异辛烷损耗约0.2%,表明Pt/CeO_2催化剂在催化氧化脱硫中具有较好的活性和稳定性。Effects of reaction temperature, O2/S molar ratio and WHSV on the performance of Pt/CeO2 catalyst were investigated for aerobic oxidative desulfurization （AODS） of various organic sulfur （ benzothiophene） in isooctane with sulfur content of 1 000 mg·g^-1 Benzothiophene conversion of 95% was obtained under 300 ℃, O2/S molar ratio of 26.4 and WHSV of 15.3 h^-1. At 300 ℃ and organic sulfur conversion of 95%, the reactivity of different organic sulfur over Pt/CeO2 catalyst declined in the following order： 1-pentanthoil 〉 dibutylsulfide 〉 benzothiophene 〉 thiophene 〉 dibenzothiophene. It was found by GC-PFPD and GC-MS that SO2 was the sole sulfur-containing products in either liquid phase or gas phase effluent. Thiophene conversion remained at around 95% during a 200 h test run, with O2 utilization efficiency of 40% and isooctane loss of about 0.2% , indicating that Pt/CeO2 catalyst was a highly-active, selective and stable AODS catalyst.

关 键 词：石油化学工程 氧化脱硫催化剂 噻吩 二氧化硫 

分 类 号：TQ426.95[化学工程] O643.36[理学—物理化学]