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박중남,박용기,김희영,이철위,홍석인 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
The methylation of 2-methylnaphthalene (2-MN) by methanol with 1,2,4-trimethylbenzene (1,2,4- TMB) as the solvent and transmethylating agent was studied over H-Beta, USY, H-mordenite (HMOR), H-ZSM-12 and H-ZSM-5 zeolite catalysts in a high-pressure fixed-bed flow reactor. For HBeta catalyst, reaction parameters, such as reaction temperature, pressure, weight hourly space velocity (WHSV), methylation agent and solvent concentration and type, were controlled to investigate the effect of reaction conditions on the catalytic activity. It is also found that as the transmethylation agent, 1,2,4-TMB plays an essential role in maintaining the catalyst at the high catalytic activity and stability, and the high reaction pressure favors to improve the catalyst stability. An attempt is made to explain the catalytic conversion, selectivity and stability in relation to the catalyst acidities, pore structures, reactant and product properties and reaction conditions.
박중남,동유양,이철위,홍석인 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Catalytic performances of various dealuminated H-mordenite, H-Beta for the methylation of 2-methylnaphthalene (2-MN) by methanol and 1,2,4-trimethylbenzene (TMB) as a solvent and methylating agent were investigated in a high-pressure fixed-bed flow reactor. It was found that dealumination of H-mordenite could substantially improve the catalytic selectivity and stability. The H-mordenite with the steam treatment at 550°C followed by acid leaching was revealed to exhibit comparatively high and stable conversion of 40% with the high 2,6-/2,7-DMN ratio of 2.4 at TOS 5h compared with H-mordenite showing conversion of 8.4% with 2,6-/2,7-DMN ratio of 1.4. On the other hand, H-Beta with the steam treatment at 800° C followed by acid leaching shows lower 2-MN conversion of 61% compared with unmodified H-Beta with 2-MN conversion of 89% at TOS 5h. The catalytic behavior has been discussed in relation with the catalyst porosity and acidity.