Aromatization of Methanol over La/Zn/HZSM-5 Catalysts

Abstract

Abstract: Aromatization of methanol over co-impregnated La/Zn/HZSM-5 zeolite catalyst was studied.The selectivity of aromatics and BTX(benzene,toluene,and xylene)reached 64.0% and 56.6%,respectively,using La/Zn/HZSM-5 at 437℃,0.1 MPa and methanol WHSV(weight hourly space velocity)=0.8 h^-1.Catalytic results showed that the La species was a very good promoter,increased selectivity of aromatics,and prolonged the catalyst lifetime on stream.The effects of the SiO₂/Al₂O₃ ratio in zeolite,Zn and La loading,WHSV,reaction temperature, water content in the feed and H₂ pretreatment of catalysts on the catalytic performance were studied in detail. Characterizations of the catalysts by thermogravimetric analysis(TGA),NH₃-TPD(temperature programmed desorption),SEM(scanning electron micrograph),N₂ adsorption-desorption,XRD(X-ray diffraction) and XRF (X-ray fluorescence),were carried out to understand the structure and discuss the aromatization performance of La/Zn/HZSM-5 zeolite catalyst.

Key words: methanol, aromatization, La, Zn, ZSM-5

摘要： Aromatization of methanol over co-impregnated La/Zn/HZSM-5 zeolite catalyst was studied.The selectivity of aromatics and BTX(benzene,toluene,and xylene)reached 64.0% and 56.6%,respectively,using La/Zn/HZSM-5 at 437℃,0.1 MPa and methanol WHSV(weight hourly space velocity)=0.8 h^-1.Catalytic results showed that the La species was a very good promoter,increased selectivity of aromatics,and prolonged the catalyst lifetime on stream.The effects of the SiO₂/Al₂O₃ ratio in zeolite,Zn and La loading,WHSV,reaction temperature, water content in the feed and H₂ pretreatment of catalysts on the catalytic performance were studied in detail. Characterizations of the catalysts by thermogravimetric analysis(TGA),NH₃-TPD(temperature programmed desorption),SEM(scanning electron micrograph),N₂ adsorption-desorption,XRD(X-ray diffraction) and XRF (X-ray fluorescence),were carried out to understand the structure and discuss the aromatization performance of La/Zn/HZSM-5 zeolite catalyst.

关键词: methanol, aromatization, La, Zn, ZSM-5

NI Youming, SUN Aiming, WU Xiaoling, HU Jianglin, LI Tao, LI Guangxing. Aromatization of Methanol over La/Zn/HZSM-5 Catalysts[J]. , 2011, 19(3): 439-445.

倪友明, 孙爱明, 吴小岭, 胡江林, 李涛, 李光兴. Aromatization of Methanol over La/Zn/HZSM-5 Catalysts[J]. , 2011, 19(3): 439-445.

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