CrO_x/SiO_2催化剂对C_(10+)芳烃加氢脱烷基反应的催化性能  

Catalytic Performance of CrO_x/SiO_2 Catalyst for Hydrodealkylation of C_(10+) Heavy Aromatics

作　　者：石德先[1] 赵震[1] 徐春明[1] 段爱军[1] 万国赋[1] 窦涛[1] 

机构地区：[1]石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《催化学报》2005年第7期582-586,共5页

基　　金：中国石油天然气股份公司资助项目(03041421).

摘　　要：采用等体积浸渍法制备了一系列不同组成的CrOx/SiO2催化剂样品,并用XRD,FTIR,UVVis,TPR和N2吸附等技术对催化剂样品进行了表征,考察了催化剂对C10+重芳烃加氢脱烷基反应的催化性能.结果表明,CrOx/SiO2催化剂对C10+重芳烃加氢脱烷基反应的催化性能与催化剂的表面结构有关,脱烷基活性主要来自载体表面的CrOx物种.当催化剂中n(Cr)/n(Si)=1%～2%时,CrOx在SiO2表面达到单层分散;当n(Cr)/n(Si)=2%～20%时,表面CrOx物种含量的变化不大,催化剂的活性及选择性基本不变.Heavy aromatics can be lightened by hydrodealkylation to produce light aromatics. A series of CrOx/ SiO2 catalyst samples with different compositions for hydrodealkylation of C10+ heavy aromatics were prepared by incipient wetness impregnation. The samples were characterized by XRD, FT-IR, UV-Vis DRS, TPR and N-2 adsorption methods. The relationship between the catalytic performance and the structure of the catalyst samples was investigated. A small amount of Cr2O3 crystalline was detected when n(Cr)/n(Si) reached 2%. The CrOx species might exceed monolayer coverage on SiO2 surface when n(Cr)/n(Si) = 2%, i. e. the monolayer coverage of CrOx on SiO2 should be 1 % similar to 2 %. The surface CrOx species were the mainly active components in the CrOx/SiO2 catalyst for the reaction. The catalyst activity did not change greatly with Cr/Si molar ratio when Cr loading exceeded the monolayer coverage.

关 键 词：氧化铬 二氧化硅 负载型催化剂 重芳烃 加氢脱烷基 

分 类 号：O643.32[理学—物理化学]