Supported VPO catalysts for selective oxidation of butane .2. Characterization of VPO/SiO2 catalysts

被引:39
作者
Birkeland, KE
Babitz, SM
Bethke, GK
Kung, HH
Coulston, GW
Bare, SR
机构
[1] NORTHWESTERN UNIV,IPATIEFF LAB,CTR CATALYSIS & SURFACE SCI,EVANSTON,IL 60208
[2] DUPONT CO INC,DEPT CENT RES & DEV,WILMINGTON,DE 19880
[3] DOW CHEM CO USA,DEPT CENT RES & DEV,MIDLAND,MI 48674
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 35期
关键词
D O I
10.1021/jp962571c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
SiO2-supported VPO catalysts with different P/V ratios were prepared, used in selective oxidation of butane, and characterized by X-ray diffraction (XRD), laser Raman spectroscopy (LRS), near-edge X-ray absorption spectroscopy (XANES), and P-31 magic angle spinning NMR. Similar to the SiO2-supported catalysts of lower metal loadings studied previously, the maleic anhydride selectivity increased with increasing P/V ratio, to greater than 50 mol % for P/V = 2. XRD and LRS detected predominantly alpha(1)-VOPO4 or a phase that is structurally very similar for both P/V = 1 and P/V = 2 samples. However, within the detection limit of the XANES experiment, the P/V = 1 catalyst contained mostly V5+ under reaction conditions, whereas the P/V = 2 catalyst contained 100% V4+.
引用
收藏
页码:6895 / 6902
页数:8
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