Characterization and performance of sulfated VOx–TiO2 catalysts in the one-step oxidation of methanol to dimethoxymethane
Characterization and performance of sulfated VOx–TiO2 catalysts in the one-step oxidation of methanol to dimethoxymethane
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DOI：
10.1016/j.catcom.2009.11.009
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发表时间：
2010-01
影响因子：
3.7
通讯作者：
Heqin Guo;Debao Li;D. Jiang;Wenhuai Li;Yuhan Sun
中科院分区：
文献类型：
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作者：
Heqin Guo;Debao Li;D. Jiang;Wenhuai Li;Yuhan Sun
采用快速燃烧法合成了硫酸化VOx-TiO 2催化剂。以甲醇一步氧化制二甲氧基甲烷为反应体系，考察了该催化剂的催化性能。结果表明，硫酸根含量低于4mol%时，硫酸根在催化剂表面高度分散，高于4mol%时，硫酸根在催化剂表面发生聚集。前者有助于增加酸性中心的数量，而后者则减少了酸性中心的数量。硫酸根含量为4mol%时DMM的选择性最高（91.76%），这是由于硫酸根含量为4mol%时DMM的酸性中心最多，还原性较强。
The sulfated VOx–TiO2catalysts were synthesized by rapid combustion method. The catalytic properties were evaluated by the one-step oxidation of methanol to dimethoxymethane. It was found that the sulfate was highly dispersed on the catalyst surface as the sulfate content below 4mol%, and aggregated as it was above 4mol%. The former contributed to the increased number of acidic sites, while the latter decreased the number of acidic sites. The highest DMM selectivity (91.76%) was obtained with the sulfate content at 4mol%, which should be attributed to its largest number of acidic sites and stronger reducibility.