Catalytic oxidation and isotopic exchange of hydrogen over 12-tungstophosphoric acid
Catalytic oxidation and isotopic exchange of hydrogen over 12-tungstophosphoric acid
复制标题
12-钨磷酸催化氧化和氢同位素交换
DOI：
10.1021/j100345a089
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
M. Misono
中科院分区：
文献类型：
--
作者：
N. Mizuno;M. Misono
The reactions of H{sub 2}, such as H{sub 2}-D{sub 2} isotopic equilibration and exchange, reduction of catalyst by H{sub 2} (noncatalytic oxidation of H{sub 2} by a catalyst), and catalytic oxidation of H{sub 2}, have been studied mostly at 573 K over 12-molybdophosphoric acid (PMo{sub 12}) and its Na salt. The isotopic equilibration and exchange were apparently very slow, although the uptake of H{sub 2} proceeded at a considerable rate. This was in marked contrast to 12-tungstophosphoric acid (PW{sub 12}) studied previously, for which the equilibration and exchange were very rapid, while the H{sub 2} uptake was negligible. The present results were explained by numerical simulation, which revealed that the accumulation of protons and subsequent formation of water from proton and polyanion took place nearly uniformly in the bulk of PMo{sub 12} at a rate comparable with the H{sub 2} uptake. Due to this, the rates of reduction and the catalytic oxidation of H{sub 2} were almost independent of their specific surface area (thus called bulk-type catalysis, type II).
