Physico-chemicals and catalytic properties of manganese-promoted vanadium phosphate (VPO) catalyst
Yap, Taufiq Yun Hin and Goh, Chee Keong and Kamiya, Yuichi (2007) Physico-chemicals and catalytic properties of manganese-promoted vanadium phosphate (VPO) catalyst. Reaction Kinetics and Catalysis Letters, 92 (2). pp. 275-284. ISSN 0133-1736; ESSN: 1588-2837
Official URL: http://dx.doi.org/10.1007/s11144-007-5191-4
The addition of 1% Mn promoter to vanadium phosphate catalyst led to doubling of the specific surface area from 20.3 (unpromoted) to 39.4 m2 g−1. The XRD pattern of the Mn-promoted catalyst gave only the characteristics of the (VO)2P2O7 phase, indicating that the Mn was incorporated into the crystal lattice of the catalyst. The Mn-promoted catalyst was also twice as active in removing the total amount of oxygen. However, since the only oxygen species related to V4+ being removed and no oxygen species associated with V5+ was observed, the n-butane conversion was not much improved as compared to the unpromoted counterpart. A necessary amount and distribution of the V5+ phase in a well crystalline V4+ phase is essential in order to enhance the catalytic performance in the mild oxidation of n-butane to maleic anhydride.
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