La2O3助剂对Rh/SiO2催化CO加氢反应性能的影响  

Effect of La2O3 addition on the catalytic performance of Rh/SiO2 for CO hydrogenation

作　　者：石张平 祁晓岚[2] 李旭光[2] 李华英 李经球[2] 孔德金[2] 俞俊 SHI Zhang-ping;QI Xiao-lan;LI Xu-guang;LI Hua-ying;LI Jing-qiu;KONG De-jin;YU Jun(Research Institute of Applied Catalysis,School of Chemical and Environmental Engineering,Shanghai Institute of Technology,Shanghai 200235,China;State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,SINOPEC Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China)

机构地区：[1]上海应用技术大学,化学与环境工程学院应用催化研究所,上海200235 [2]中国石油化工股份有限公司上海石油化工研究院,绿色化工与工业催化国家重点实验室,上海201208

出　　处：《燃料化学学报》2020年第4期483-489,I0007,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21808142)资助。

摘　　要：采用溶胶凝胶法制备了SiO2和La2O3-SiO2载体,再通过浸渍法分别引入Rh-La和Rh组分,研究考察了La引入方式对Rh/SiO2催化CO加氢反应性能的影响。结果表明,La的添加有利于提高Rh的分散度,促进Rh+中心数的增加,有效地抑制产物中CO2的生成,提高含氧化合物选择性。此外,La的引入方式会影响La与Rh间的相互作用强弱,Rh和La共浸渍制得的2Rh-5La2O3/SiO2催化剂中Rh-La相互作用较强,削弱的Rh-CO键有利于反应过程中CO的插入反应,使得产物以C2+含氧化合物为主。而La以助剂形式掺入SiO2制得的2Rh/5La2O3-SiO2催化剂具有较弱的La-Rh相互作用,其产物则以甲醇、乙醇等低碳醇为主。SiO2 and La2O3-SiO2 were synthesized via sol-gel method and used as support to prepared Rh-La or Rh doped catalysts by iso-volumic impregnation. Effects of doping mode of La on the catalytic performance of Rh/SiO2 for CO hydrogenation are investigated detailedly. The results reveal that the addition of La can improve the dispersion of Rh and increase Rh+ centers, which can effectively inhibit the formation of CO2 and improve the selectivity of oxygenates. Furthermore, the doping mode of La can affect the interaction between La and Rh. A strong La-Rh interaction is achieved over the 2 Rh-5 La2O3/SiO2 catalyst prepared by co-impregnation of Rh and La with SiO2 support. The strong interaction between La and Rh can efficiently weaken the Rh-CO bonds and enhance the CO insertion reaction in the reaction process, which makes the product dominated by C2+ oxygenates. The 2 Rh/5 La2O3-SiO2 catalyst prepared via La2O3-SiO2 composite support exhibits a weak La-Rh interaction, and methanol, ethanol and other low-carbon alcohols are obtained as the main products.

关 键 词：La2O3助剂 Rh/SiO2催化剂 CO加氢 C2含氧化合物 

分 类 号：O643.322[理学—物理化学]