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Citation: CAO Chong-Jiang, CHEN Chang-Lin, XU Nan-Ping. Preparation of SO₄^2-/Al₂O₃/ZrO₂ through Digestion Modification and Its Catalytic Activity in n-Butane Isomerization[J]. Chinese Journal of Applied Chemistry, ;2007, 24(11): 1240-1244. shu

Preparation of SO₄^2-/Al₂O₃/ZrO₂ through Digestion Modification and Its Catalytic Activity in n-Butane Isomerization

1.
a College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009;
2.
b Department of Applied Chemistry, Nanjing University of Finance and Economics, Nanjing 210003

Corresponding author: CAO Chong-Jiang,
Received Date: 26 November 2006
Available Online: 10 April 2007
Fund Project: 国家自然科学基金资助项目(20476047) (20476047)

Zirconium hydroxide was produced by digestion of hydrous oxide at 100℃ with the control of reflux time. The structural information, surface area and thermal stability were characterized by means of XRD, TG-DTG, chemical analysis and N₂ adsorption-desorption techniques. The zirconium hydroxide obtained by digestion can be used to prepare SO₄^2-/Al₂O₃/ZrO₂ solid acid and the catalytic activities of these materials were examined in n-butane isomerization. The data show the crystallization and the transformation from the metastable tetragonal phase to the monoclinic phase were retarded with digestion during calcination. However, the hydroxyl of hydrous zirconia decreased with long time digestion which showed a passive effect on retaining surface sulfated and catalytic activity. With digestion time increasing, the thermal stability and surface area increased while the sulfated content was not monotonically increasing. The results show the sulfated content of catalyst was less than 1.1% after 96 h digestion and its n-butane conversion was no more than 20%. In contrast, the sulfated content of the catalyst was 1.45% after 24 h digestion refluxing. The n-butane conversion on the resulting catalyst was more than 46%, which is close to the equilibrium conversion of n-butane.
- zirconium hydroxide,
- solid acid,
- digestion,
- n-butane,
- isomerization
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通讯作者: 陈斌, bchen63@163.com

Preparation of SO₄^2-/Al₂O₃/ZrO₂ through Digestion Modification and Its Catalytic Activity in n-Butane Isomerization