介孔Al_2O_3、SiO_2负载MoO_3-Fe_2O_3催化甘油脱水还原制丙烯醇  

Mesoporous Al_2O_3 and SiO_2 supported MoO_3-Fe_2O_3 catalysts for glycerol conversion into allyl alcohol

作　　者：兰海[1,2] 肖熙[1,2] 袁善良 张彪[1] 蒋毅[1] Lan Hai Xiao Xi Yuan Shanliang Zhang Biao Jiang Yi(Chengdu Institute of Organic Chemistry,Chinese Academy of Science,Chengdu Sichuan 610041,China University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院成都有机化学研究所,四川成都610041 [2]中国科学院大学,北京100049

出　　处：《石油化工》2017年第7期850-856,共7页Petrochemical Technology

摘　　要：分别以商品Al_2O_3和自制SiO_2为载体,通过浸渍法制备了负载型MoFeOx/Al_2O_3和MoFeOx/SiO_2催化剂,利用XRD,BET,XPS,NH3-TPD等手段表征了催化剂的组成、结构和表面酸性,并考察了催化剂对甘油多相催化转化制丙烯醇的催化性能。实验结果表明,高比表面积Al_2O_3和SiO_2的表面均形成了高分散态MoO3和Fe_2O_3,呈弱酸性。具有发达、规整介孔结构的SiO_2更能促进MoO_3-Fe_2O_3之间的相互作用,提高催化剂表面的活性中心数。以MoFeOx/Al_2O_3为催化剂,甘油转化率为83.2%,丙烯醇选择性和收率分别为10.1%和8.4%,且催化剂易积碳而失活;而以MoFeOx/SiO_2为催化剂,甘油转化率达97.1%,丙烯醇收率和选择性分别提高到21.1%和22.7%,并展现出较高的稳定性和再生性。The MoFeOx/Al2O3 and MoFeOx/SiO2 were prepared by wet impregnation methods using commercial Al2O3 and prepared SiO2 as supports. The supported catalysts were characterized by XRD,BET,XPS and NH3-TPD,and investigated by gas glycerol catalytic conversion into allyl alcohol. The results show that the MoO3 and Fe2O3 species exist on Al2O3 and SiO2 in amorphous state,which shows weak acid property. The developed mesoporous SiO2 with high specific surface area and supported Mo-Fe oxides is exposing more surface reactive sites with interaction between MoO3 and Fe2O3. The glycerol catalytic conversion over MoFeOx/Al2O3 was 83.2 %,with the allyl alcohol yield and selectivity of 8.4% and 10.1%,respectively,but decrease badly because of coke produced. However,for the MoFeOx/SiO2,the catalytic conversion of gas glycerol reached 97.1 %,with the yield and selectivity of allyl alcohol improved to 21.1% and 22.7%,respectively,showing better stability and reproduction ability than the MoFeOx/Al2O3.

关 键 词：Fe-Mo氧化物催化剂 介孔SIO2 甘油 丙烯醇 

分 类 号：TQ324[化学工程—合成树脂塑料工业]