高等学校化学学报2012，Vol.33Issue(1)：96-101,6.DOI:10.3969/j.issn.0251-0790.2012.01.016
Cr/NaZSM-5催化剂上CO2氧化丙烷脱氢反应
Oxidative Dehydrogenation of Propane to Propylene with CO2 over Cr/NaZSM-5 Catalysts
摘要
Abstract
A series of Cr catalysts supported on 9ubmicro NaZSM-5 zeolite was prepared. The obtained samples were characterized by N2 adsorption, XRD, UV-Vis and H2-TPR, and tested as catalysts for dehydroge-nation of propane to propylene in the presence of C02. The highest activity was achieved on the catalyst with a Cr content of 3% and a Si/Al molar ratio of 60. In this case, the propane conversion and propylene selectivity were 48.3% , 86.0% and 30. 1% , 91. 8% , respectively after the reaction at 550 ℃ for 10 min and 8 h. There is a good relationship between the initial activity and Cr6* content of the catalysts, showing that a high content of Cr6+ species in the calcined catalyst is crucial for its high catalytic activity in dehydrogenation of propane to propylene with CO2. A higher propylene yield was obtained during propane dehydrogentaion in the presence of CO2 than N2. This can be attributed to a higher surface concentration of Cr6+ retained on the catalyst in the presence of CO2 as well as the elimination of hydrogen produced by propane dehydrogenation.关键词
Cr/NaZSM-5/丙烷/脱氢/丙烯/二氧化碳Key words
Cr/NaZSM-5/ Propane/ Dehydrogenation/ Propylene/ Carbon dioxide分类
化学化工引用本文复制引用
张帆,聂颖颖,缪长喜,乐英红,华伟明,高滋..Cr/NaZSM-5催化剂上CO2氧化丙烷脱氢反应[J].高等学校化学学报,2012,33(1):96-101,6.基金项目
国家自然科学基金(批准号:20773027)、国家"九七三"计翅项目(批准号:2006CB806103)、上海市科学技术委员会项目(批准号:08 DZ2270500)和上海石油化工研究院项目(批准号:ZC06070002)资助. （批准号:20773027）
