Surface and Subsurface Dynamics of the Intermetallic Compound ZnNi in Methanol Steam Reforming
Surface and Subsurface Dynamics of the Intermetallic Compound ZnNi in Methanol Steam Reforming
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DOI：
10.1021/jp303174h
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发表时间：
2012-07-19
影响因子：
3.7
通讯作者：
Armbruester, Marc
中科院分区：
文献类型：
--
作者：
Friedrich, Matthias;Teschner, Detre;Armbruester, Marc
金属间化合物ZnNi已被测试为非负载型粉末催化剂在甲醇蒸汽重整，在该过程中表现出严重的性能变化。原位XPS实验结果表明，Zn氧化使ZnNi表面发生分解，Ni的偏析完全消除。原位DTA/TG和XRD结果表明，ZnNi的分解甚至向体相延伸。在这些发现的基础上，最初归因于ZnNi的催化性能不能归因于金属间化合物，但必须分配到分解产物的混合物。
The intermetallic compound ZnNi has been tested as unsupported powder catalyst in methanol steam reforming, showing severe performance changes during the process. Results from in situ XPS experiments proved the decomposition of the surface of ZnNi by Zn oxidation and complete desegregation of Ni. The decomposition of ZnNi even extends toward the bulk, as proven by in situ DTA/TG and XRD. On the basis of these findings, the catalytic properties initially ascribed to ZnNi can not be attributed to the intermetallic compound but have to be assigned to a mixture of the decomposition products.