화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.15, No.1, 92-97, January, 2009
DOI10.1016/j.jiec.2008.09.005  Export Citation
Preparation and characterization of the bimetallic Pt.Au/ZnO/Al2O3 catalysts: Influence of Pt.Au molar ratio on the catalytic activity for toluene oxidation
Ki-Joong Kim, Su-Il Boo1, and Ho-Geun Ahn†
  • Department of Chemical Engineering, Sunchon National University, Suncheon, Jeonnam 540-742, Republic of Korea
  • 1Department of Bio-Engineering, Seonam University, Namwon, Jeonbuk 590-711, Republic of Korea
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The bimetallic Pt-Au catalysts supported on ZnO/Al2O3 with different Pt/Au molar ratios were prepared by impregnation (IMP) method using a mixed solution of Pt and Au precursor. These were characterized by X-ray diffraction (XRD), CO chemisorption, temperature programmed reduction (TPR), and transmission electron microscopy (TEM) equipped energy dispersive spectroscopy (EDS). Catalytic activity for complete oxidation of toluene was measured using a flow reactor under atmospheric pressure. In the results, the aggregation of Au particles depended on themolar ratio in the bimetallic Pt-Au catalyst, and Pt particles was well dispersed homogeneously even by the IMP method. The Pt75Au25 and Pt67Au33 catalysts concurrently coated with Pt and Au precursors by IMP method showed higher activity than monometallic Pt and Au catalyst for toluene oxidation. Also, in order of the catalytic activity for toluene was very good agreement compare with the TPR results. The Au particles might promote the toluene oxidation over the bimetallic catalyst concurrently coated with Pt and Au particles. Therefore, the size of Pt and Au particles and catalytic activity were confirmed to be correlated to molar ratio of Pt and Au loaded.
Keywords:Bimetallic;Pt.Au catalyst;XRD;TPR;TEM;Toluene oxidation
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