SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (6): 627-632.DOI: 10.1016/S1004-9541(13)60498-X

• CATALYSIS, KINETICS AND REACTION ENGINEERING • Previous Articles     Next Articles

Surface Acidity of Aluminum Phosphate and Its Catalytic Performance in Benzene Alkylation with Long Chain Olefin

YUAN Haikuan, LIU Xuru, REN Jie, SHEN Lian   

  1. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, China
  • Received:2011-03-30 Revised:2012-12-01 Online:2013-07-03 Published:2013-06-28
  • Contact: REN Jie

Surface Acidity of Aluminum Phosphate and Its Catalytic Performance in Benzene Alkylation with Long Chain Olefin

袁海宽, 刘旭汝, 任杰, 慎炼   

  1. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, China
  • 通讯作者: REN Jie

Abstract: The acidic properties of aluminum phosphate (AlPO4-5) solid acid catalyst were characterized by temperature programmed desorption (TPD) of ammonia (NH3), n-propylamine (n-C3H7NH2), iso-propylamine [(CH3)2CHNH2] and n-dipropylamine [(C3H7)2NH] separately, and its catalytic performance in benzene alkylation with long chain olefin was studied in a fixed-bed reactor. The characterized acid amount of catalyst increased with the basicity of adsorbates. With increase of the activation temperature of catalyst, the acid amount characterized by NH3-TPD decreased, however, it increased when characterized by TPD using three other adsorbates. The desorption kinetics of TPD process and the deactivation kinetics of catalyst were investigated. The acidity and catalytic performance of catalyst was also correlated. The results showed that the acid amount and strength are well correlated with the activity and stability using NH3 as adsorbate, respectively, which indicated NH3 was a better basic adsorbate. It was also found that the catalyst with higher acid amount and lower acid strength on the surface exhibited the better catalytic performance and stability.

Key words: surface acidity, temperature programmed desorption, basic adsorbate, benzene alkylation, catalytic activity

摘要: The acidic properties of aluminum phosphate (AlPO4-5) solid acid catalyst were characterized by temperature programmed desorption (TPD) of ammonia (NH3), n-propylamine (n-C3H7NH2), iso-propylamine [(CH3)2CHNH2] and n-dipropylamine [(C3H7)2NH] separately, and its catalytic performance in benzene alkylation with long chain olefin was studied in a fixed-bed reactor. The characterized acid amount of catalyst increased with the basicity of adsorbates. With increase of the activation temperature of catalyst, the acid amount characterized by NH3-TPD decreased, however, it increased when characterized by TPD using three other adsorbates. The desorption kinetics of TPD process and the deactivation kinetics of catalyst were investigated. The acidity and catalytic performance of catalyst was also correlated. The results showed that the acid amount and strength are well correlated with the activity and stability using NH3 as adsorbate, respectively, which indicated NH3 was a better basic adsorbate. It was also found that the catalyst with higher acid amount and lower acid strength on the surface exhibited the better catalytic performance and stability.

关键词: surface acidity, temperature programmed desorption, basic adsorbate, benzene alkylation, catalytic activity