Cumene disproportionation over micro/mesoporous catalysts obtained by recrystallization of mordenite

Development of hierarchical MCM-49 zeolite with intracrystalline mesopores and improved catalytic performance in liquid alkylation of benzene with ethylene

“…6B(d) and (e)). This implies that the MCM-49 framework is not destroyed significantly during the post-treatment time of 2e22 h, which is possibly attributed to the protection of the MCM-49 framework from an intensive adsorption of CTAB micelles on the external surface of the zeolites [23]. Accordingly, the external surface area of the sample rapidly increases from 116 m 2 /g of MCM-49 to 374 m 2 /g of 0.1CTAB-0.4NaOH-70T-2t, and then slowly rises to 391 m 2 /g of 0.1CTAB-0.4NaOH-70T-22t (Table 1).…”

Zeolite-Catalyzed Disproportionation of iso-Propylbenzene: Identification of Reaction Intermediates and Mechanism

“…For example, oxidation of m-DiPB and pDiPB leads to resorcinol and hydroquinone, respectively, that are valuable monomers for numerous polymers. 13 In addition, iPB disproportionation has long been known as a useful test reaction for characterizing the internal pore structure of zeolites. 14,15 It has been repeatedly shown that while medium-pore zeolites like H-ZSM-5 (framework type MFI) with two intersecting 10-ring channels inhibit the formation of diphenyl-iso-propane species during the reaction, these bulky reaction intermediates can be easily created in large-pore materials.…”

“…14,15 It has been repeatedly shown that while medium-pore zeolites like H-ZSM-5 (framework type MFI) with two intersecting 10-ring channels inhibit the formation of diphenyl-iso-propane species during the reaction, these bulky reaction intermediates can be easily created in large-pore materials. [13][14][15] Like the case of nPB disproportionation, as a result, two major types of reaction pathways have been proposed for iPB disproportionation: i) the monomolecular iso-propyltransfer mechanism and ii) the bimolecular mono-iso-propylated 2,2-diphenylpropane (mipDP)-mediated one. [14][15][16] However, no studies have provided clear evidence for the formation of mipDP species during this reaction.…”

Conversion of Straight-Run Gasoline Fraction on Combined Zeolite-Containing Catalysts

“…Greater feedstock conversion can be attained by combining into a single catalyst composition zeolites with different structural and molecular-sieve characteristics that enable the catalyst structural multi-porosity to be controlled [2]. Furthermore, catalysts with acidic centers 155 of different strengths can prolong the catalytic effect and, as a result, increase feedstock conversion if placed in a single reactor.Comprehensive searches for catalysts with combined micro-and mesoporosity are being conducted, in particular, at M. V. Lomonosov Moscow State University under the direction of I. I. Ivanova [3][4][5][6][7]. These catalysts were highly efficient for petrochemical synthesis using pure compounds [4,8,9] and for refining mixtures of hydrocarbons [3], including gasoline fractions [5].…”

“…Comprehensive searches for catalysts with combined micro-and mesoporosity are being conducted, in particular, at M. V. Lomonosov Moscow State University under the direction of I. I. Ivanova [3][4][5][6][7]. These catalysts were highly efficient for petrochemical synthesis using pure compounds [4,8,9] and for refining mixtures of hydrocarbons [3], including gasoline fractions [5].…”