Citation: LIU Gang, YANG Lu-Xin, WU Shu-Jie, JIA Ming-Jun, ZHANG Wen-Xiang. Influence of Acid-Base Properties of K-Loaded Aluminophosphate Catalysts on Their Catalytic Behavior in the O-Methylation of Catechol[J]. Acta Physico-Chimica Sinica, ;2014, 30(6): 1163-1168. doi: 10.3866/PKU.WHXB201404081 shu

Influence of Acid-Base Properties of K-Loaded Aluminophosphate Catalysts on Their Catalytic Behavior in the O-Methylation of Catechol

1.
1 College of Chemistry, Jilin University, Changchun 130012, P. R. China;
2 Technical Department, Yingkou Tianyuan Chemical Research Institute Co., Ltd., Yingkou 115004, Liaoning Province, P. R. China

Received Date: 24 January 2014
Available Online: 8 April 2014
Fund Project:

K-loaded aluminophosphates prepared by impregnation were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, N₂ adsorption, and NH₃ as well as CO₂ temperatureprogramed desorption (NH₃-TPD, CO₂-TPD). The results show that potassium was highly dispersed on the surface of the aluminophosphates. The amount of surface acidic and basic sites decreased upon adding a small amount of potassium. With an increase in potassium, the amount of surface acid sites decreased and the amount of surface base sites did not obviously change. Vapor-phase O-methylation of catechol with methanol was carried out to investigate the catalytic performance of the K-loaded aluminophosphates. Selectivity toward guaiacol obviously increased when a small amount of potassium was added. With an increase in the potassium content, selectivity toward guaiacol increased further and the conversion of catechol decreased. Combined with the characterization results, the surface weak acidic sites play an important role in improving the conversion of catechol and the surface weak basic sites are suitable for improving selectivity toward guaiacol.
- Aluminophosphate,
- Catechol,
- Guaiacol,
- Weak acid and base,
- K-loading
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