The Hydroisomcrization Nature of Nickel-Substituted Mica Montmorillonite and Its Silica Oligomcrs Filtered Clay in Hexane Reaction

Abstract

Abstract: Synthesis of nickel-substituted mica-montmorillonite (NiSMM) was carried out by hy-drothermal mathod. NiSMM was crosslinked with NH₂C₃H₇Si(OCH₃)₃to yield thermally stable clay (PNiSMM). The hydroisomerization of n-hexane on Pd-impregnated and PNiSMM was observed.It was found that the catalysts reduced by H₂at 386℃ are highly active for the isomerization. New strong Bronsted acid sites are formed and strong Lewis acid sites are consumed during the reduction of the catalysts. These facts imply that the highly acidic Bronsted sites are perhaps responsible for the high isomerzation activity. The amount of Pd-impregnated on the catalysts is relative to the activity and the selectivity. This fact implies that the nature of the cluster composed of Ni and Pd atoms seems to be correlative with the properties of the catalysts if metal sites are responsible for the dehydro-genation of alkane.

Key words: NiSMM, Cross-linking, Hydroisomerization

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Liu Zi-yang, Jiang Da-zhen, Cai Hui, Cai Hong-wei, Min En-ze. The Hydroisomcrization Nature of Nickel-Substituted Mica Montmorillonite and Its Silica Oligomcrs Filtered Clay in Hexane Reaction[J]. Chem. J. Chinese Universities, 1991, 12(3): 397.

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The Hydroisomcrization Nature of Nickel-Substituted Mica Montmorillonite and Its Silica Oligomcrs Filtered Clay in Hexane Reaction

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