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Received July 31, 2008
Accepted November 24, 2008
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Methanol selective oxidation to dimethoxymethane on H3PMo12O40/SBA-15 supported catalysts
1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, P. R. China 2Graduate University of the Chinese Academy of Sciences, Beijing 100039, China
Korean Journal of Chemical Engineering, May 2009, 26(3), 902-906(5), 10.1007/s11814-009-0151-5
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Abstract
A series of SBA-15 supported H3PMo12O40 catalysts were prepared for the one-step oxidation of methanol to dimethoxymethane (DMM). The evaluation and characterization revealed that higher DMM selectivity obtained on the incipient wetness impregnation (IM) catalyst was related to the instability of H3PMo12O40 on it. Raman spectra showed that 12-molybdophosphoric acid was more stable on the direct synthesis (DS) catalyst than on the IM catalyst and the existence of SBA-15 support enhanced the stability of H3PMo12O40. Moreover, higher H3PMo12O40 loading resulted in more acid sites and low DMM selectivity, furthermore the thermal pretreatment on H3PMo12O40 influenced its structure and thus affected DMM selectivity.
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References
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