Influence of Si/Al ratio on the catalytic properties of NiH mordenite in the disproportionation of toluene |
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| Affiliation: | 1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiang Xi, China;2. Department of Chemical and Biochemical Engineering, National Engineering Laboratory for Green Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;2. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;3. Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, PR China;4. China Shenhua Coal to Liquid and Chemical Company Limited, Beijing 100011, PR China |
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| Abstract: | ![]()
The disproportionation of toluene on dealuminated NiH mordenites has been studied in order to understand the influence of the Si/Al ratio on the activity, selectivity and stability of these catalysts.Four dealuminated H mordenites were prepared by combined treatments of calcination under wet air and boiling HC1 solution; the atomic Si/Al ratio of the framework, determined by 29Si NMR spectroscopy, varied from 5 to 29.3.A maximum of activity was obtained for a Si/Al ratio of ~12.6. This catalytic behaviour is explained by the influence of the Si/Al ratio on the acidity and also by strong diffusional limitations for the non-dealuminated catalyst.The most active catalyst is also the most selective in aromatic compounds. On the other hand, the non-dealuminated catalyst is the least selective, as explained by a strong hydrogenolysis activity.The decrease of selectivity in aromatics of the dealuminated NiH mordenites after ageing can be explained by the activation of some of the nickel which was not previously reduced, and also by the higher temperatures of the catalytic tests, which favour the hydrogenolysis and hydrocracking reactions. |
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