高等学校化学学报Issue(4)：812-817,6.DOI:10.7503/cjcu20131076
Cr-13 X/K-Cr-13 X分子筛催化剂上二氯甲烷的催化燃烧
Catalytic Combustion of Dichloromethane over Cr-13 X and K-Cr-13 X Zeolites Catalysts
摘要
Abstract
Cr-13 X and K-Cr-13 X zeolites catalysts with different K and Cr contents were prepared by ion ex-change method, and their catalytic performance for catalytic combustion of dichloromethane were evaluated in a conventional fixed bed reactor. Then, these catalysts were characterized via physicochemical techniques. The results showed that, when the Cr content was less than 5.19%, crystallinity of 13X zeolite was not affec-ted by the addition of K and Cr significantly. Cr addition not only enhanced the selectivity of CO2 product, but also eliminated CH3 Cl by-products. The exchange of K with an appropriate amount enhanced the stability and activity of Cr-13X catalyst, as well as the selectivity of CO2 and HCl products. The enhancement of the cata-lytic activity and the products distribution could be accounted for the basis of oxidation and acidity of catalysts. On the condition of gas hourly space velocity of 1í104 h-1 and dichloromethane concentration of 5692 mg/m3 , an optimal 1.31%K-5.01%Cr-13X catalyst was found with t50 at 212 ℃, t98 at 298 ℃ , CO2 selectivity at 60.6% and HCl selectivity at 96.5%, and this catalyst showed relatively stable catalytic activity during 100 h reaction.关键词
二氯甲烷/催化燃烧/13X分子筛/钾/铬13X分子筛Key words
Dichloromethane/Catalytic combustion/13X zeolite/Potassium/chromium 13X zeolite分类
化学化工引用本文复制引用
张丽雷,刘绍英,李子健,姚洁,王公应..Cr-13 X/K-Cr-13 X分子筛催化剂上二氯甲烷的催化燃烧[J].高等学校化学学报,2014,(4):812-817,6.基金项目
国家“八六三”计划项目(批准号:2008AA062601)资助.@@@@Supported by the National High Technology Research and Development Program, China(No.2008AA062601) （批准号:2008AA062601）
