物理化学学报 >> 1994, Vol. 10 >> Issue (10): 874-881.doi: 10.3866/PKU.WHXB19941003

研究论文 上一篇    下一篇

WO3在不同担体上的程序升温硫化研究

纪纯新, 魏昭彬, 辛勤   

  1. 中国科学院大连化学物理研究所催化基础研究国家重点实验室，大连 116023
  • 收稿日期:1993-04-20 修回日期:1993-08-09 发布日期:1994-10-15
  • 通讯作者: 魏昭彬

Study of WO3 Supported on Different Carrier by TPS

Ji Chun-Xin, Wei Zhao-Xin, Xin Qin   

  1. State Key Laboratory for Catalysis of Dalian Institute of Chemical Physics,Dalian 116023
  • Received:1993-04-20 Revised:1993-08-09 Published:1994-10-15
  • Contact: Wei Zhao-Xin

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摘要：

利用TPS（Temperature-programmed-sulfiding）方法考察了WO_3在γ－Al_1O_3TiO_2－Al_2O_3及活性碳上的硫化过程．结果发现，随着WO_3担载量的增加，表面W物种硫化峰的数目增加，表明WO_3的担载量超过一定量后，在这三种担体表面，都有几种W物种同时存在；WO_3／TiO_2－Al_2O_3与WO_3／Al_2O_3相比，当WO_3担载量低于一个单层分布时，硫化温度明显降低，而超过一个单层分布后，两者的硫化温度相接近，表明TiO_2的调变作用对低于一个单层分布的WO_3的硫化行为有较大的影响．以活性碳作为担体可明显降低W物种的硫化温度，并且活性碳在程序升温过程中，当温度超过700K后出现了气化现象．文中还就WO_3在TiO_2－Al_2O_3担体表面的结构模型提出了设想．

关键词: WO3, γ-Al2O3, TiO2-Al2O3, 活性碳, TPS

Abstract:

The sulfiding procedures of WO3 supported on 7-Al2O3, TiO2-Al2O3 and carbon were examined by TPS (Temperature-programmed-sulfiding) method. Results show that the number of sulfiding peaks of WO3 increases when the loading of WO3 is raised, it can be elucidated that there exist simultaneously various W spieces on the three different carriers when the loading of WO3 becames higher. Comparing the sulfiding temperature of Wos/Tioz-Al:O3 with that of WO3/7-Al2O3, it is found that the presence of TiO2 covered on Al2O3 surface can make WO3 sulfided at lower temperature when WO3 loading is below one monolayer. When carbon is taken as the carrier, the sulfiding temperature of WOs is greatly decreased, and the phenomenon of carbon carrier being gasified is observed when temperature is higher than 7OoK during our experiment. In addition, a structure model of WO3 carried on TiO2-Al2O3 is suggested in this issue.

Key words: WO3, γ-Al2O3, TiO2-Al2O3, Carbon, TPS