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Citation: Zhao Bi-Ying, Xu Xian-Ping, Gao Jin-Ming, Ma Hua-Rong, Tang You-Qi. The Effect of the Preparation Methods on the Structure of WO₃/ZrO₂[J]. Acta Physico-Chimica Sinica, ;1995, 11(11): 979-984. doi: 10.3866/PKU.WHXB19951105 shu

The Effect of the Preparation Methods on the Structure of WO₃/ZrO₂

1.
Institute of Physical Chemistry,Peking University,Beijing 100871

Received Date: 16 December 1994
Available Online: 15 November 1995

WO3/ZrO2 catalysts prepared from Zr(OH)4 and crystallized ZrO2 have been characterized by means of XRD, LRS (qualitative and quantitative), and the specific sufrace area has been measured. The influence of the preparation method, the contents of WO3 in the samples and the calcination tempearture on the specific surface areas of the samples, the phase of support and the structural states of active component has been studied. The results show: (1) WO3 can disperse on ZrO2 as a monolayer; (2) WO3 dispersed on Zr(OH)4 as a monolayer retards the crystalline growth of the support on calcination, makes it crystallizing into a metastable tetra nal modification, and prevents the inter- crystalline sintering between the crystallites of ZrO2. These factors would result in an increase in the specific surface area of WO3／ZrO2 prepared from Zr(OH)4. As the content of WO3 in the sample comes up to its monolayer capacity, this effect is displayed most fully. A chemical reaction can occur between WO3 and Zr(OH)4 (or the tetra nal ZrO2) at a high temperature(800℃)，producing some superacid sites on the surface. By these views, the main experimental facts published in the literatures can been interpreted satisfactotily.
- Superacid,
- WO₃/ZrO₂,
- Raman spectroscopy,
- Monolayer dispersion,
- Quantitative LRS
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The Effect of the Preparation Methods on the Structure of WO3/ZrO2

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通讯作者: 陈斌, bchen63@163.com

The Effect of the Preparation Methods on the Structure of WO₃/ZrO₂