Para-selectivity of SAPO-5 and mordenite catalysts in the alkylation of cumene with 2-propanol |
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| Institution: | 1. Escuela Superior de Ingeniería Química e Industriales Extractivas, Instituto Politécnico Nacional, Col. Zacatenco, 07738 Mexico City, Mexico;2. Departamento de Enegía, Universidad Autónoma Metropolitana-A, Av. San Pablo No. 180, 02200 Mexico City, Mexico;3. Dirección de Investigación, Instituto Mexicano del Petróleo, Eje Lázaro Cárdenas 152, 07730 Mexico City, Mexico;1. Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;3. Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;4. Chemical Engineering Department, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia;5. Chemistry Department, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia |
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| Abstract: | Alkylation of cumene with 2-propanol was studied on SAPO-5 and mordenite catalysts. The primary products of the alkylation on every catalyst examined here were p- and m-diisopropylbenzene (DIPB) in a ratio of 75:25. The p-DIPB fraction in DIPB isomers (para-selectivity) decreased with increasing yield of DIPB, due to the secondary reaction of p-DIPB to m-DIPB. On SAPO-5, mordenite and silica-alumina, this secondary reaction proceeds through dealkylation of p-DIPB to cumene, followed by re-alkylation of the resultant cumene to m-DIPB. The dealkylation of p-DIPB would occur preferentially over that of m-DIPB. This was due to the higher reactivity of p-DIPB and probably to the reactant molecular shape selectivity of SAPO-5 and mordenite. The para-selectivity was improved by supporting boron oxide on SAPO-5 and mordenite; this improvement was caused by suppression of the secondary dealkylation of p-DIPB. |
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