Publication

Development of environmental benign solid catalysts for the selective alkylation of aromatics

Albert Renken, Lioubov Kiwi
1999
Conference Papers

Abstract

Vapor-phase alkylation of aroms. over environmentally benign solid catalysts is a valuable alternative to the conventional alkylation carried out traditionally over mineral acids and Friedel-Crafts type catalysts. Two examples for the development of new, simple, non-corrosive and environmentally safe processes of the selective methylation were reported: (1) the selective (80%) formation of 4,4'-dimethylbiphenyl over H-ZSM-5 zeolite, and (2) the prodn. of 3-methylcatechol over g-alumina modified with Mg2+ and Li+. Mechanistic considerations for the alkylation reactions were discussed. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/cd92d2ba-65b1-4787-b110-6d6b4dc0f7ac

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Albert Renken, Lioubov Kiwi
1999
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cd92d2ba-65b1-4787-b110-6d6b4dc0f7ac

About this result

Related concepts (25)

Mineral

In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. The geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or organic compounds in the sense of chemistry (such as mellite). Moreover, living organisms often synthesize inorganic minerals (such as hydroxylapatite) that also occur in rocks.

Zeolite

Zeolites are microporous, crystalline aluminosilicate materials commonly used as commercial adsorbents and catalysts. They mainly consist of silicon, aluminium, oxygen, and have the general formula M1/nn+(AlO2)-(SiO2)x・yH2O where M1/nn+ is either a metal ion or H+. These positive ions can be exchanged for others in a contacting electrolyte solution. H+ exchanged zeolites are particularly useful as solid acid catalysts.

Alkylation

Alkylation is a chemical reaction that entails transfer of an alkyl group. The alkyl group may be transferred as an alkyl carbocation, a free radical, a carbanion, or a carbene (or their equivalents). Alkylating agents are reagents for effecting alkylation. Alkyl groups can also be removed in a process known as dealkylation. Alkylating agents are often classified according to their nucleophilic or electrophilic character. In oil refining contexts, alkylation refers to a particular alkylation of isobutane with olefins.