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首页> 外文期刊>RSC Advances >Effect of zeolite pore structure on the diffusion and catalytic behaviors in the transalkylation of toluene with 1,2,4-trimethylbenzene
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Effect of zeolite pore structure on the diffusion and catalytic behaviors in the transalkylation of toluene with 1,2,4-trimethylbenzene

机译：沸石孔结构对甲苯与1,2,4-三甲基苯烷基转移反应中扩散和催化行为的影响

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摘要

Effects of pore structures of ZSM-5, MOR, Beta and USY on their catalytic properties in the transalkylation of toluene with 1,2,4-trimethylbenzene (1,2,4-TMB) were investigated by studying the catalytic mechanism and the diffusion behavior of reactants and products. The medium-pore ZSM-5 shows low catalytic activity as a result of slow decomposition of diphenylmethane (DPM) intermediates and occurrence of severe cracking of 1,2,4-TMB via the monomolecular reaction pathway. In contrast, the large-pore MOR, Beta and USY zeolites allow rapid formation and transformation of bulky DPM species, consequently exhibiting higher catalytic activity. The diffusion experiments show that 1,2,4-TMB and 1,2,4,5-tetramethylbezene (1,2,4,5-TeMB) more easily diffuse into/out of the pores of MOR zeolite than of Beta and USY. Thus, the disproportionation of 1,2,4-TMB and coking were inhibited in MOR, which makes it exhibit higher catalytic stability and xylene selectivity. A detailed analysis of the deposited coke species with GC-MS indicates that the transalkylation of toluene with 1,2,4-TMB occurs via the bimolecular intermediate mechanism.
机译：通过研究催化机理和扩散，研究了ZSM-5，MOR，Beta和USY的孔结构对其在甲苯与1,2,4-三甲基苯（1,2,4-TMB）烷基转移反应中的催化性能的影响。反应物和产物的行为。中孔ZSM-5由于二苯甲烷（DPM）中间体的缓慢分解和通过单分子反应途径发生的1,2,4-TMB严重裂解而显示出低催化活性。相反，大孔MOR，Beta和USY沸石可以快速形成和转化庞大的DPM物质，因此具有较高的催化活性。扩散实验表明，与Beta和USY相比，1,2,4-TMB和1,2,4,5-四甲基苯（1,2,4,5-TeMB）更容易扩散到MOR沸石的孔中/从其中扩散出来。 。因此，在MOR中抑制了1,2,4-TMB的歧化和焦化，这使其表现出更高的催化稳定性和二甲苯选择性。用GC-MS对沉积的焦炭种类进行的详细分析表明，甲苯与1,2,4-TMB的烷基转移是通过双分子中间机理发生的。

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