Reactions of aromatic hydrocarbons over zeolite β

• Published in: Journal of catalysis Vol. 119; no. 1; pp. 65 - 70
• Main Authors: Ratnasamy, P., Bhat, R.N., Pokhriyal, S.K., Hegde, S.G., Kumar, R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.09.1989; Elsevier
• Subjects: 02 PETROLEUM; 020400 - Petroleum- Processing; 400201 - Chemical & Physicochemical Properties; ALKYLATED AROMATICS; AROMATICS; CATALYSIS; CATALYTIC EFFECTS; CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; Chemistry; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; Exact sciences and technology; General and physical chemistry; HYDROCARBONS; INORGANIC ION EXCHANGERS; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ION EXCHANGE MATERIALS; ISOMERIZATION; KINETICS; MATERIALS; METHYLATION; MICROSTRUCTURE; MINERALS; ORGANIC COMPOUNDS; OXIDATION; POROSITY; REACTION KINETICS; REDUCTION; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TOLUENE; XYLENES; ZEOLITES; Disproportionation; Hydrocarbon; Isomerization; Zeolite; Experimental study; X ray diffraction; Molecular sieve; Benzenic compound; Methylation; Catalyst activity; Catalyst; Comparative study; Physical method
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/0021-9517(89)90134-6

The catalytic properties of zeolite β in the isomerization of metaxylene, and the methylation and disproportionation of toluene have been measured and compared with those of other zeolites like ZSM-5, -23, -48, and -50. While zeolite β does not exhibit product shape selectivity among the xylene isomers, it suppresses the formation of the bulky 1.3.5 isomer among trimethylbenzenes leading to high concentrations of the 1.2.4 isomer with the minimum cross section. The disproportionation-to-isomerization ratio in the reactions of metaxylene over these zeolites follows the order β ZSM-50 ZSM-5 ZSM-48 ZSM-23 ZSM-22. A comparison of β with ZSM-5 in the xylene isomerization process using industrial feedstock reveals similar trends. The observed shape-selective properties of β in these reactions of aromatic hydrocarbons are explained in terms of its 12-membered three-dimensional pore structure.