Kinetic modeling of heavy reformate conversion into xylenes over mordenite-ZSM5 based catalysts

U.A. Al-Mubaiyedh; S.A. Ali; S.S. Al-Khattaf

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Kinetic modeling of heavy reformate conversion into xylenes over mordenite-ZSM5 based catalysts

机译：动力学建模的重整油转换基于对二甲苯/ mordenite-ZSM5催化剂

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Conversion of commercial heavy reformate into xylenes is investigated in a fluidized-bed batch reactor to develop a kinetic model. H-mordenite and H-ZSM5 based catalysts containing equal amounts of H-mordenite and H-ZSM-5 (SiO2/Al2O3 ratio: 27) were used. The SiO2/Al2O3 ratio of H-mordenite in the catalysts was 18 and 180, which are named as MLZ and MHZ, respectively. The MLZ catalyst resulted in higher conversion of methylethylbenzenes (MEBs) and trimethylbenzenes (TMBs) and exhibited better selectivity toward xylenes due to higher acid-site concentration. Kinetic modeling was carried out using a simplified reaction network which includes: (i) dealkylation of MEBs; (ii) dis-proportionation of TMBs; (iii) transalkylation of TMBs with toluene; and (iv) paring reaction of tetramethylbenzenes. The results of the mathematical model closely match the experimental data, based on statistically significant estimate of the kinetic parameters, which indicates that the set of assumptions made for kinetic modeling are valid. The order of apparent activation energies, E_(paring) >> E_(dealkylation) = E_(disproportionotion) >E_(transaikylation), can be ascribed to the relative size of the reactant molecules involved in these reactions.

机译：商业重型重整油转化为二甲苯是一批流化床调查反应堆建立动力学模型。和基于H-ZSM5催化剂包含平等的大量H-mordenite和H-ZSM-5(二氧化硅/氧化铝比:27)。H-mordenite催化剂是18,180,分别命名为MLZ和MHZ。MLZ催化剂导致更高的转换与methylethylbenzenes MEBs) (trimethylbenzenes(三甲),表现出更好的选择性二甲苯由于acid-site浓度。进行了动力学建模使用简化反应网络包括:(i)MEBs脱烷基化作用;三甲;及(iv)削四甲基苯的反应。数学模型的结果与实验数据,基于统计上显著的动能的估计参数,这表明的集合假设为动力学建模是有效的。明显的顺序激活能量,E_(去皮)> > E_(脱烷基化作用)=E_ (disproportionotion) > E_ (transaikylation)被归结为反应物的相对大小分子参与了这些反应。

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《Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers》 |2012年第11期|1943-1955|共13页
作者
U.A. Al-Mubaiyedh; S.A. Ali; S.S. Al-Khattaf;
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作者单位

Center of Research Excellence in Petroleum Refining and Petrochemicals, King Fahd Uniuersity of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;

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正文语种英语
中图分类国际共产主义运动;
关键词
mordenite; Transalkylation; DealkylationXylenesCatalystskinetic model;

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Kinetic modeling of heavy reformate conversion into xylenes over mordenite-ZSM5 based catalysts

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