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《Chinese Journal of Catalysis》 2006-03
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Acidity and Catalytic Performance of BEA/MOR Intergrowth Zeolites

QI Xiaolan~(1,2*),LI Bin~1,LI Shijie~1,LIU Xiyao~1,LIN Bingxiong~1(1 Institute of Physical Chemistry,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China;2 Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China)  
The acid properties of BEA/MOR(intergrowth of zeolite β and mordenite) samples with SiO_2/Al_2O_3 molar ratio of 25 were characterized by temperatureprogrammed desorption of NH_3(NH_3-TPD).There is a volcano-type relationship between the higher NH_3-TPD peak temperature and the mordenite content of the BEA/MOR samples,and the NH_3-TPD peak temperature reached the maximum at mordenite content of about 65%.In contrast,there is a linear relationship between the higher NH_3-TPD peak temperature and the mordenite content of the mechanical mixtures of zeolite β and mordenite.No obvious difference in the acid strength existed between the BEA/MOR samples and the mechanical mixtures when the mordenite content was less than 50%.However,when the mordenite content exceeded 50%,the BEA/MOR samples possessed much higher acid strength than the mechanical mixtures.The BEA/MOR sample with 65% mordenite showed the highest acid strength,which was higher than that of the mordenite.The catalytic activity measurements of all the samples for methanol dehydration were carried out in a fixed-bed reactor under atmospheric pressure,temperature of 180 ℃,and methanol space velocity of 2 h~(-1).Dimethyl ether and water were the only products for each catalyst.No coke formation and catalyst deactivation were observed in the reaction of 6 h.There is a linear relationship between the methanol conversion and the mordenite content of the mechanical mixtures.The BEA/MOR samples with mordenite content higher than 40% showed higher catalytic activity than HM,and the BEA/MOR with 65% mordenite showed the highest methanol conversion.The catalytic activity of BEA/MOR also exhibited a volcano-type behavior.Compared with the mechanical mixtures,the BEA/MOR samples displayed higher catalytic activity.The HM with SiO_2/Al_2O_3 molar ratio of 11 deactivated after 60 h reaction though it had high initial activity.The HBEA/MOR with SiO_2/Al_2O_3 molar ratio of 53 showed relatively high catalytic activity and stability.
【Fund】: 国家自然科学基金资助项目(20373002)
【CateGory Index】: O643.36
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