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Citation: Chen Zhixue,
Zhao Yaqin, Lu Kunquan*. THE STUDY OF STRUCTURE AND PHASE CONTENT IN NiO/α-Al₂O₃ CATALYST BY EXAFS[J]. Acta Physico-Chimica Sinica, ;1988, 4(03): 267-272. doi: 10.3866/PKU.WHXB19880309 shu

THE STUDY OF STRUCTURE AND PHASE CONTENT IN NiO/α-Al₂O₃ CATALYST BY EXAFS

1.
Central Laboratry; Sichuan University
Institute of Physics; Academia Sinica

Received Date: 25 October 1986
Available Online: 15 June 1988

The structure and phase content in industrial catalyst NiO/α-Al_2O_3 before and after reaction were studied by EXAFS. Part of NiO in the catalyst is reduced to Ni phase. The reducing amount is different for the samples located at different height of the reactor. The phase contents of NiO and Ni were measured and the local structure around Ni atoms was measured by using mixed phase EXAFS analysis method. The results show that the average coordination number of Ni atom in Ni phase is decreased compared with metal Ni. This is caused by more Ni atoms located at surface state. The dimension of Ni cluster is estimated. Meanwhile there is no obvious change of the environment of Ni atom in NiO phase before and after reaction.
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THE STUDY OF STRUCTURE AND PHASE CONTENT IN NiO/α-Al₂O₃ CATALYST BY EXAFS