LAI Qunping1, YI Xiaodong1, HUA Weiqi2, WENG Weizheng1*, WAN Huilin1*
(1.State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. Yantai Wanhua Polyurethanes Co., Ltd., Yantai 264002, Shandong, China)
Abstract: Mn promoted Mo based mixed oxide catalysts were prepared by coprecipitation method and were tested for selective oxidation of isobutene to methacrolein (MAL). Catalytic reaction were carried out in a fixed-bed micro-reactor at atmospheric pressure, while the properties of the catalysts were studied by BET and XRD. It was found that, with the generation of Bi3FeMo2O12, Mn(NO3)2 as precursor to introduce Mn to Mo-Bi-Fe-Co-Cs-K based catalyst can improve the conversion of the catalyst effectively, even though the Bi3FeMo2O12 phase certainly do not play much role in improving the selectivity of MAL. However, catalyst shows superior catalytic performance when using MnMoO4 as precursor instead of Mn(NO3)2, under suitable condition, the conversion of isobutene and the selectivity of MAL reach 92.8% and 93.5%, respectively. The performance is stable after the reaction for 72 h, XRD test shows that the excellent performance is closely related with the new phase called MX which would generate when Mn added with MnMoO4 as precursor.
Key words: isobutene; selective oxidation; methacrolein (MAL); manganese; Mo-Bi based catalyst
E-mail: yxd7468@163.com
Journal of Molecular Catalysis, Vol. 26, Issue 1, 2012, 10-18
