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

doi:10.1016/S1004-9541(13)60498-X

摘要/Abstract

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

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

袁海宽, 刘旭汝, 任杰, 慎炼. Surface Acidity of Aluminum Phosphate and Its Catalytic Performance in Benzene Alkylation with Long Chain Olefin[J]. Chinese Journal of Chemical Engineering, 2013, 21(6): 627-632.

YUAN Haikuan, LIU Xuru, REN Jie, SHEN Lian . Surface Acidity of Aluminum Phosphate and Its Catalytic Performance in Benzene Alkylation with Long Chain Olefin[J]. Chin.J.Chem.Eng., 2013, 21(6): 627-632.

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