Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (2): 334.doi: 10.7503/cjcu20180523

• Physical Chemistry • Previous Articles     Next Articles

Formaldehyde Ethynylation Reaction over Cu2O Supported on TiO2 with Different Phases

WANG Zhipeng, NIU Zhuzhu, BAN Lijun, HAO Quanai, ZHANG Hongxi, LI Haitao*(), ZHAO Yongxiang*()   

  1. Engineering Research Center of Ministry of Education for Fine Chemicals, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
  • Received:2018-07-24 Online:2019-02-10 Published:2018-12-05
  • Contact: LI Haitao,ZHAO Yongxiang E-mail:htli@sxu.edu.cn;yxzhao@sxu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.U1710221, 21503124) and the International Scientific and Technological Cooperation Project of Shanxi Province, China(No.201703D421034)

Abstract:

Cu2O/TiO2 catalysts with anatase and rutile titania as supports were prepared by liquid reduction-deposition-precipitation method and applied in 1,4-butynediol synthesis by formaldehyde ethynylation reaction. Effects of different TiO2 polymorphs on structure and catalytic performance of catalyst were investigated, combined with N2 physical adsorption-desorption, H2-temperature programmed reduction(H2-TPR), high resolution transmission electron microscopy(HRTEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and CO infrared spectroscopy(CO-IR). The results showed that the ethynylation activity of catalyst with rutile TiO2 as support was obviously higher than that of anatase TiO2 as support. This was mainly due to the different surface structures originated from the different crystalline structures of the as-prepared TiO2.The(110) planes were preferentially exposed planes for rutile TiO2. Compared with anatase TiO2, the higher density vacant sites and different coordination structures of copper species on rutile (110) planes facilitated the formation of more Cu—O—Ti structures, exhibiting stronger interaction between Cu2O and the support. Meanwhile, the stronger interaction between Cu2O and rutile efficiently retained the dispersion of active species and stablized the valence of Cu+, leading to a higher catalytic performance.

Key words: Cu2O/TiO2, Phase structure, Formaldehyde ethynylation, 1, 4-Butynediol

CLC Number: 

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