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Chemcial Industry and Engineering 2010, Vol. 27 Issue (1) :1-6    DOI:
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Synthesis of 2,6-Diisopropylnaphthalene over H-mordenite Catalyst Modified by Nitric Acid
HE Guang-xiang~ 1,2 , GONG Yan-jun~1,LIU Yan-hong~ 1,2 ,JIN Hai-bo~2, DOU Tao~1(1. The CNPC Key Laboratory of Catalysis, China University of Petroleum (Beijing), Beijing 102249, China; 2.Department of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China)
(1. The CNPC Key Laboratory of Catalysis, China University of Petroleum (Beijing), Beijing 102249, China; 2.Department of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

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Abstract The H-mordenites (HM) was dealuminated by nitric acid leaching. The naphthalene isopropylation reaction performance of the modified HM zeolite catalyst was investigated in a fix-bed reactor. Influences of different dealuminatation methods and Si/Al ratios on catalytic performances were analyzed. The results show that the catalytic selectivity of 2, 6-DIPN is increased after dealuminated by nitric acid leaching. A combination of hydrothermal treatment with nitric acid leaching can remove acid centre effectively, change ratio of B to L acid and acid strength distribution. The selectivity of 2, 6-DIPN is increased without decreasing naphthalene conversion rate. The increase of Si/Al ratio results in a slight decrease of catalytic activity and improvement of stability, the selectivity increased firstly and then decreased with increasing of Si/Al ratio. The optimized operating conditions for zeolite dealuminatation are as follows: HM zeolites is treated in 0.5 h~ -1 steam at 500 ℃ for 1.0 h, then is processed by nitric acid leaching at 45 ℃ for 24.0 h. The corresponding Si/Al ratio is 31 and 2, 6-DIPN yield is 7.24%.
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Received 2010-01-15; published 2010-01-15
Cite this article:   
HE Guang-xiang~ 1,2 , GONG Yan-jun~1,LIU Yan-hong~ 1,2 ,JIN Hai-bo~2, DOU Tao~1.Synthesis of 2,6-Diisopropylnaphthalene over H-mordenite Catalyst Modified by Nitric Acid[J]  Chemcial Industry and Engineering, 2010,V27(1): 1-6
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