Catalytic performance of Au-Ti active site on MWW zeolite for oxidative cyclohexane to cyclohexanol/one in oxysteam condition

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-01-21 DOI:10.1016/j.micromeso.2025.113519

Kui Xu , Sijia Liu , Xue Shao , Yuqi Yang , Xin Zhan , Guiying Wu , Ximin Wang , Meng Huang , Fang Jin

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Abstract

A mixture of cyclohexanol and cyclohexanone (KA oil) is the main raw material for caprolactam and adipic acid. The Ti and Au was sequentially introduced into the deboronated MWW zeolite by atom-planting (AP) method and deposition-.precipitation method as the catalyst for cyclohexane oxidation by molecular oxygen with higher selectivity of KA oil. The tetra-coordinated Ti species introduced by AP method in the zeolite framework can highly disperse the Au nano-particles as an active site for the cyclohexane oxidation. The flexible MWW zeolite layer structure facilities modification the pore structure of ERB-1 zeolite by introduction of mesopore and exposed the more silanol group on the external surface of the zeolite the exposed pore size structure can improve the cyclohexane conversion and cyclohexanol selectivity. The optimal Au nano-particle size for oxidation is around 2 nm. Moreover, the cyclohexane oxidation conditions can be optimised by varying the oxygen pressure, solvent polarity and reaction time and temperature teaccording to the radical reaction mechanism.

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.