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Comparative Study of Nickel Catalysts Supported on X ‐ and Y ‐Zeolites
Author(s) -
Chien ShuHua,
Lu KuangLieh,
Huang HsiauWen
Publication year - 1985
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198500047
Subject(s) - chemistry , catalysis , nickel , dispersion (optics) , chemisorption , ion exchange , temperature programmed reduction , incipient wetness impregnation , metal , inorganic chemistry , ion , selectivity , organic chemistry , physics , optics
We have made a comparative study of CO/H 2 reactions over the nickel catalysts supported on X ‐ and Y ‐zeolites, prepared by incipient‐wetness impregnation (W) and ion‐exchange (E) methods. The catalysts were characterized by surface area and volumetric chemisorption measurements, temperature programmed reduction profiles, and x‐ray diffraction analysis. The results show that the turnover frequency decreases in the order; NiX(W)>NiY(W)>NiY(E)>NiX(E). The metal dispersion and catalytic activity of the catalyst are mainly affected by the support materials, the preparation methods, and the activation procedures. The high activity of NiX(W) was due to its higher reducibility, smaller nickel crystalline size, and better nickel dispersion. The low activity of NiX(E) was attributed to the poor ion‐exchange of Ni with NaX, the poor reducibility, the large crystalline size, and the poor nickel dispersion.