Catalytic Technology for Selective Hydrogenation of Benzene to Cyclohexene by Zhongyi Liu & Shouchang Liu & Zhongjun Li

Author:Zhongyi Liu & Shouchang Liu & Zhongjun Li
Language: eng
Format: epub
ISBN: 9789811564116
Publisher: Springer Singapore

Zhongjun Li

Email: [email protected]

Compared with the preparation technology of the third-generation catalyst for benzene-selective hydrogenation, the fourth-generation Ru–Zn@BZSS core-shell catalyst overcomes the technical bottleneck of in situ preparation method of the BZSS salt. The surface modification of the catalyst by using the non-in situ prepared BZSS improves the selectivity and yield of cyclohexene, and the controllable preparation of the catalyst can be achieved. The main technical indicators of the catalyst are as follows: benzene conversion of 70%, cyclohexene selectivity of more than 80%, cyclohexene yield of more than 56%. Compared with the third-generation catalysts, the benzene conversion of the fourth-generation catalysts increased by 10% points, and the cyclohexene yield increased by 8% points.

The Ru–Zn catalysts with the same theoretical Zn content are prepared with different Zn precursors. As long as Zn content is the same, the catalyst activity and cyclohexene selectivity can be maintained at a certain level, the structural and textural properties of the catalyst are roughly the same. Zn exists as ZnO in the Ru–Zn catalyst, and ZnO rich on the surface of the catalyst can react with ZnSO4 in the slurry to form an insoluble basic zinc sulfate complex salt. The surface adsorption of BZSS can reduce the Zn content in the catalyst, keeping the total Zn content in the surface and interior of the catalyst unchanged, and then the catalysts with high activity and selectivity can be prepared.

The main contents of this chapter are as follows: the effect of Zn precursor and Zn content on the properties of the Ru–Zn catalyst, and the research and development as well as industrial applications of the fourth-generation Ru–Zn@BZSS catalyst.

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