A breakthrough was made in the hydroxylation reaction system of zeolite molecular sieve catalytic aromatic hydroxylation

Researchers at Nanjing University of Technology recently made important progress in the reaction of zeolite molecular sieve to catalytic hydroxylation preparation of phenolic compounds, and successfully realized the instantaneous reaction of more than 10 kinds of aromatic hydroxylated preparation phenolic compounds, including benzene.
Professor Wang Jun's team prepared an all-silicon zeolite molecular sieve catalyst using the dry glue of acid hydrolytic silicon source, which realized the instantaneous reaction of more than 10 aromatic direct hydroxylated preparation phenolic compounds, with a reaction time of <30s, well below the reaction time of 10 to dozens of hours required for previous reports, and with an ultra-high TOF (conversion frequency) value.
phenol is an important chemical raw materials, the industrial use of multi-step propylene propylene method has a low phenol yield, serious pollution, high energy consumption defects, for a long time, the use of clean oxygen sources such as hydrogen peroxide by benzene hydroxyl preparation of phenol step method by the academic community and industry wide attention
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However, benzene is an inert substrate, the product of phenol is easier to active than the substrate benzene, and for alkyl benzene, its side chain is more active, which often leads to benzene cyclooxide or side chain oxidation and a series of serious side reactions. As a result, the highly selective generation of hydrocarbon bonds directly activated by benzene rings requires targeted highly active catalysts, which has been a major challenge in the field of multiphase catalysis.
Wang Jun's team has been working on the study of synthetic helium zeolite in the source route of acid hydrolysis silicon, and the new catalytic reaction system found this time has been completed on the basis of long-term accumulation. The new molecular sieve has ultra-high TOF timely short yield, good substrate suitability and stable catalyst recycling performance, which shows important potential industrial application prospects.
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