Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (10): 2691-2698.doi: 10.3866/PKU.WHXB20101006

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Naphthalene Hydrogenation Activity over Pd, Pt and Pd-Pt Catalysts and Their Sulfur Tolerance

ZHANG Xiao-Fei,SHAO Zheng-Feng,MAO Guo-Qiang,HE De-Min, ZHANG Qiu-Min, LIANG Chang-Hai   

  1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, Liaoning Province, P. R. China
  • Received:2010-05-06 Revised:2010-07-21 Published:2010-09-27
  • Contact: ZHANG Qiu-Min, LIANG Chang-Hai E-mail:qmzhang@chem.dlut.edu.cn, changhai@dlut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973029) and Fundamental Research Funds for the Central Universities, China.

Abstract:

Monometallic Pd and Pt as well as bimetallic Pd:Pt catalysts (Pd1Pt1, Pd1Pt4, and Pd4Pt1) with Pd/Pt molar ratios of 1:1, 1:4, and 4:1 supported on SiO2-Al2O3 were prepared by incipient-wetness impregnation and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), CO chemisorption, and X-ray photoelectron spectroscopy (XPS). Their catalytic activities toward naphthalene hydrogenation and the sulfur tolerance of these catalysts were investigated. We found that naphthalene conversion, selectivity toward decalin, and the trans-/cis-decalin yieldratio on Pd4Pt1 were 98.2%,93.6%,and 7.8,respectively,which are higher than those on Pd(97.5%,59.1%, 4.3) and Pt (96.8%, 39.9%, 2.9). The rate of naphthalene hydrogenation on the three catalysts increased according to: vPd4Pt1>vPd>vPt. In the presence of dibenzothiophene (DBT), the naphthalene conversion and selectivity toward decalin for Pd4Pt1 were still the highest. The trans-/cis-decalin ratio was not affected on the Pt catalyst, but it did decrease slightly on Pd4Pt1 and it decreased observably on the Pd catalyst. The Pd4Pt1 catalyst also presented the highest naphthalene conversion and selectivity toward decalin among the three bimetallic catalysts studied in the presence and absence of DBT.

 

Key words: Noble metal, Naphthalene, Hydrogenation, Sulfur tolerance, trans-/cis-decalin yield ratio

MSC2000: 

  • O643