Dehydrogenation of Cycloalkanes on Lanthanide-Containing Bimetallic Catalyst Systems

DOI Web Site Web Site 22 References

Bibliographic Information

Other Title
  • 希土類系バイメタリック触媒によるシクロアルカンの脱水素反応
  • キドルイケイ バイメタリック ショクバイ ニ ヨル シクロアルカン ノ ダツ

Search this article

Abstract

There has been a growing interest in the surface properties, in particular as catalysts, of lanthanide-3 d intermetallic compounds and lanthanide metal overlayers. By the use of di s solution of lanthanide metals (Ln: EuYb) in liquid ammonia, we have developed metho d s for the preparation of novel lanthanide-containing bimetallic catalysts. The present in v estigation is aimed at unveiling the effects of a lanthanide overlayer on the C-H bond cle avage of cycloalkanes, which is important to determine the activity for the dehydrogenation of hydro carbon. The Ln-Co and Ln-Ni bimetallic catalysts, prepared by the reaction of Co or Ni powders with lanthanide metals dissolved in liquid ammonia, have been characterized by th e dehydrogenation of cyclohexane and methylcyclohexane combined with other catalytic action s. Their catalytic behavior varied markedly with different levels of lanthanide content. First, the rates of cycloalkane dehydrogenation decreased when the loading of lanthanide meta l s on the Co or Ni surface was low and subsequently increased with increasing loading. An analysi s of the initial decrease in the rates of reaction suggested a decrease in catalytically active transition metal sites due to coating with lanthanide metals. The surface is gradually co v ered with the lanthanide metals and simultaneously certain interactions occur to produce newly active centers in the region of high loading, resulting in acceleration of the dehydrogena t ion of cycloalkanes. The presence of lanthanide metals on Co or Ni enhanced the capacity of this surface to dissociate the C-H bond. Furthermore the effects of a lanthanide metal over layer on the catalytic reaction and related properties over an Co or Ni metal surface w ere discussed.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1993 (5), 507-512, 1993-05-10

    The Chemical Society of Japan

References(22)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top