物理化学学报 >> 1991, Vol. 7 >> Issue (06): 721-724.doi: 10.3866/PKU.WHXB19910617

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载镍沸石上NH3-TPD脱附峰的非酸性探讨

肖淑勇; 姚杰; 孟中岳   

  1. 南京师范大学化学系,南京 210024
  • 收稿日期:1990-06-25 修回日期:1991-01-28 发布日期:1991-12-15
  • 通讯作者: 肖淑勇

Probe Into NH3-TPD Curve of Ni-Containing Zeolite Out The View of Acidity

Xiao Shu-Yong; Yao Jie; Meng Zhong-Yue   

  1. Department of Chemistry, Nanjing Normal University, Nanjing 210024
  • Received:1990-06-25 Revised:1991-01-28 Published:1991-12-15
  • Contact: Xiao Shu-Yong

关键词: 沸石, 载镍, NH3-TPD

Abstract: Two peaks, appeared respectively at Ca. 900 K and 800 K on the NH_3-TPD curve of Ni-containing Y zeolite, have been investigated. These two peaks can't be simply explained by means of acidity.
One peak observed at Ca. 90O K, has been contributed to the water gas resulted from the dehydroxylation of zeolite. Another peak, appeared at Ca. 800 K, has been proved to be due to NH_3, formed by decomposation of a complex with the suggested formula Ni~(2+)(NH)_x(OH~-)_(6-x). This complex resulted from the interaction of adsorbed NH_3, the supported Ni~(2+) species and the skeleton OH groups under suitable conditions and decomposed at Ca. 800 K by a first order reaction with an activation energy of about 90.74 kJ·mol~(-1).

Key words: Zeolite, Supported Ni species, NH3-TPD