Promotion effect of alkali metal added to impregnated cobalt catalysts in the gas-phase catalytic oxidation of benzyl alcohol
Promotion effect of alkali metal added to impregnated cobalt catalysts in the gas-phase catalytic oxidation of benzyl alcohol
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DOI：
10.1021/ie040078e
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发表时间：
2004-08
影响因子：
4.2
通讯作者：
Yonghao Li;D. Nakashima;Y. Ichihashi;S. Nishiyama;S. Tsuruya
中科院分区：
文献类型：
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作者：
Yonghao Li;D. Nakashima;Y. Ichihashi;S. Nishiyama;S. Tsuruya
考察了碱金属对Co/NaY、Co/SiO2等钴系催化剂催化活性的影响。研究了NaY和SiO2等无机氧化物负载的NaY/SiO2催化剂对苯甲醇的气相催化氧化反应。负载型Co催化剂的部分氧化活性，衡量苯甲醛的产率，通过添加碱金属选择性地促进，与保持低CO2产率。在浸渍钴量一定的情况下，碱金属的添加量对苯甲醛生成的催化活性有一个最佳值。考察了Co的负载方式、无机氧化物载体、负载量、碱金属种类等对催化剂部分氧化活性的影响，以探索具有高催化活性的负载型Co催化剂。瞬态响应实验表明，参与苯甲醛生成的是吸附态氧，而不是气态氧。...
The effect of the addition of alkali metals on the catalytic activity of cobalt catalysts (Co/NaY, Co/SiO2, etc.) impregnated on inorganic oxides including NaY and SiO2 was studied using the gas-phase catalytic oxidation of benzyl alcohol. The partial oxidation activities, measured by the yield of benzaldehyde, of the supported Co catalysts were selectively promoted by adding alkali metal, with keeping the yield of CO2 low. The amount of added alkali metal under a constant amount of the impregnated cobalt had an optimal value for the catalytic activity of the benzaldehyde formation. The influences of the supporting method of Co, the inorganic oxide support, the amount of supported Co, and the kind of the added alkali metal on the partial oxidation activity were investigated to explore the supported Co catalysts for high catalytic activity. The sorpted oxygen species, rather than gaseous oxygen, were suggested to participate in the formation of benzaldehyde on the basis of a transient response experiment. ...