Article

Methanol selective oxidation to dimethoxymethane on H3PMo12O40/SBA-15 supported catalysts

Graduate University of the Chinese Academy of Sciences Beijing 100039 China
Korean Journal of Chemical Engineering (impact factor: 0.99). 05/2012; 26(3):902-906. DOI:10.1007/s11814-009-0151-5 pp.902-906

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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Keywords

acid sites
 
dimethoxymethane
 
direct synthesis
 
DMM selectivity
 
higher DMM selectivity
 
higher H3PMo12O40 loading
 
IM
 
IM catalyst
 
incipient wetness impregnation
 
low DMM selectivity
 
one-step oxidation
 
Raman spectra
 
SBA-15 support
 
thermal pretreatment
 

Heqin Guo