MoO_(3)在In_(2)O_(3)催化剂中对CO_(2)加氢制备二甲醚的促进作用  

Facilitation of dimethyl ether preparation from CO_(2) hydrogenation by MoO_(3) in In_(2)O_(3) catalysts

作　　者：汪昊洋 苏通明[1] 罗轩[1] 谢新玲[1] 秦祖赠[1] WANG Haoyang;SU Tongming;LUO Xuan;XIE Xinling;QIN Zuzeng(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]广西大学化学化工学院,广西南宁530000

出　　处：《工业催化》2025年第1期21-28,共8页Industrial Catalysis

基　　金：国家自然科学基金项目(22078074);广西自然科学基金项目(2020GXNSFDA297007)。

摘　　要：通过浸渍法将氧化钼(MoO_(3))掺杂到氧化铟(In_(2)O_(3))中制备Mo-In_(2)O_(3)催化剂,与HZSM-5分子筛组合形成双功能催化剂,并将其用于催化CO_(2)一步法合成二甲醚。结果表明,Mo-In_(2)O_(3)催化剂中双金属氧化物间形成了独特的固溶体结构,提高了催化活性,在260℃和5.0 MPa的反应条件下,Mo-In_(2)O_(3)/HZSM-5催化剂上CO_(2)转化率和二甲醚选择性分别为24.56%和56.09%,二甲醚收率比In_(2)O_(3)/HZSM-5催化剂上二甲醚收率提升了3.2倍。MoO_(3)的掺杂显著改善了催化体系的表面结构,增加了In_(2)O_(3)的比表面积和分散度,为催化剂的表面带来更多的活性位点。同时MoO_(3)还能抑制In_(2)O_(3)的过度还原,控制催化体系的氧空位浓度,显著增强了In_(2)O_(3)对CO_(2)的吸附与活化能力。In the present work,Mo-In_(2)O_(3)catalysts were prepared by doping molybdenum oxide(MoO_(3))into indium oxide(In_(2)O_(3))by an impregnation method.Combining with HZSM-5,Mo-In_(2)O_(3)/HZSM-5 were used to catalytic synthesis of dimethyl ether(DME)from CO_(2)in one-step.The results showed that a unique solid solution structure was formed in the Mo-In_(2)O_(3)catalyst,which brought higher catalytic activity.Under the reaction conditions of 260℃and 5.0 MPa,the Mo-In_(2)O_(3)/HZSM-5 catalyst achieved 24.56%CO_(2)conversion and 56.09%DME selectivity,and the DME yield was enhanced by 3.2-fold compared with that of the In_(2)O_(3)/HZSM-5 catalyst.The doping of MoO_(3)significantly improves the surface structure of the catalytic system and increases the specific surface area and dispersion of In_(2)O_(3),thus bringing more active sites to the surface of the catalyst.At the same time,MoO_(3)can inhibit the excessive reduction of In_(2)O_(3),control the concentration of oxygen vacancies in the catalytic system,and significantly enhance the adsorption and activation ability of In_(2)O_(3)to CO_(2).

关 键 词：催化化学 氧化铟 氧化钼 CO_(2)加氢 二甲醚 固溶体 

分 类 号：O643.36[理学—物理化学] TQ223.24[理学—化学]