Paper
RSC Advances
Table 3 Influence of calcined temperature on DMM selectivitya
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Selectivity (%)
Catalyst
FA
DME
MF
8.92
5.16
5.63
DMM
COx
0.73
0.34
0.07
VTS-673
VTS-723
VTS-773
VTS-823
VTS-873
20.35
3.23
1.98
7.26
19.90
3.36
0.94
0.57
1.10
1.23
66.64
90.33
91.76
83.21
64.46
8.28
14.09
0.15
19.90
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a
Reaction condition: Ar/O2/CH3OH ¼ 84.6/9.4/6.0 (v/v/v), 393 K, at
about 45% methanol conversions.
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Conclusion
The calcination temperature has profound inuence on catalyst
structure, which in turn affected the acidity and reducibility as
well as catalytic performance in the one-step oxidation of
methanol to DMM. The highest dispersion of vanadia and
sulfate was obtained on VTS-723 and VTS-773. The stronger
reducibility and more acidic sites were closely related to highly
dispersed vanadia and sulfate, while the poor reducibility and
small acidic sites were relate to the aggregated vanadia and
sulfate. The highest activity and DMM selectivity obtained on
VTS-723 and VTS-773 was due to the highest dispersion of
vanadia and the corresponding stronger reducibility and large
number of acidic sites.
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