Catalytic transformation of methyl benzenes over zeolite catalysts

0358690 - ÚFCH JH 2012 RIV NL eng J - Journal Article
Al-Khattaf, S. - Akhtar, M. N. - Odedairo, T. - Aitani, A. - Tukur, N. M. - Kubů, Martin - Musilová, Zuzana - Čejka, Jiří
Catalytic transformation of methyl benzenes over zeolite catalysts.
Applied Catalysis A - General. Roč. 394, 1-2 (2011), s. 176-190. ISSN 0926-860X. E-ISSN 1873-3875
R&D Projects: GA ČR GD203/08/H032
Institutional research plan: CEZ:AV0Z40400503
Keywords : ZSM-5 * TNU-9 * mordenite
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.903, year: 2011

Catalytic transformation of three methyl benzenes (toluene, m-xylene, and 1,2,4-trimethyl benzene) has been investigated over ZSM-5, TNU-9, mordenite and SSZ-33 catalysts in a novel riser simulator at different operating conditions. Catalytic experiments were carried out in the temperature range of 300-400 degrees C to understand the transformation of these alkyl benzenes over large pore (mordenite and SSZ-33) in contrast to medium-pore (ZSM-5 and TNU-9) zeolite-based catalysts. The effect of reaction conditions on the isomerization to disproportionation product ratio, distribution of trimethylbenzene (TMB) isomers, and p-xylene/o-xylene ratios are reported. The sequence of reactivity of the three alkyl benzenes depends upon the pore structure of zeolites. The zeolite structure controls primarily the diffusion of reactants and products while the acidity of these zeolites is of a secondary importance.
Permanent Link: http://hdl.handle.net/11104/0006408