Acid Properties of Zinc Oxide Catalysts Prepared by Several Methods

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  • NAKAJIMA Tsuyoshi
    Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University
  • NAKAGAMA Shoji
    Itami Research Laboratories, Sumitomo Electric Industries Co.
  • MISHIMA Shozi
    Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University
  • MATSUZAKI Isao
    Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University

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Other Title
  • 酸化亜鉛触媒の調製法と酸性質の関係
  • 酸化亜鉛触媒の調整法と酸性質の関係
  • サンカ アエン ショクバイ ノ チョウセイホウ ト サン セイシツ ノ カンケ

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Description

Zinc oxide catalysts were prepared from zinc chloride, sulfate, and nitrate and diethyl zinc by several methods and subjected to acid property measurement, X-ray diffraction, DTA, TG, and chemical analysis. The catalysts were prepared by thermal decomposition of hydrolysis products which had been precipitated by ( 1 ) dropwise addition of ammonia water to zinc salt solution (method I), (2) dropwise addition of salt solution to ammonia water (method II), ( 3 ) the homogeneous precipitation method (method HP), or ( 4 ) the continuous flow method (method CF) diethyl zinc was hydorolysed by ( 5 ) dropwise addition of its hexane solution to water. The chemical analysis and x-ray diffraction showed that the hydrolysis products were mainly Zn5(OH)5C12 (from the chloride by methods I, II, and CF), Zn4(OH)6(SO4) H 20 (from the sulfate by method I), Zn5(OH)9(NO3)22 H20 (from the nitrate by method I), and Zn4(OH)6(CO3) H20 (from the chloride by method HP). Every catalyst prepared from the zinc salts was shown to contain a substantial amount of the corresponding anion and to exhibit a strong acidity of 3.3<H01.5. Especially, the catalysts prepared from the chloride according to method I contained 1.6 mmol of the salt enough to explain its anomolously large acidity as much as 2.1 mmol g-1. The catalyst prepared from diethyl zinc, however, was free from the anions and showed a weak acidity of 0.01 mmol g (3.3&lt; H04.0).

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1993 (9), 1029-1033, 1993-09-10

    The Chemical Society of Japan

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