Versatile and efficient catalysts for energy and environmental processes: Mesoporous silica containing Au, Pd and Au-Pd

JOURNAL OF POWER SOURCES

卷:285

Article

da Silva, Anderson G. M.¹  Fajardo, Humberto V.¹  Balzer, Rosana²  Probst, Luiz F. D.²  Lovon, Adriana S. P.³  Lovon-Quintana, Juan J.³  Valenca, Gustavo P.³  Schreine, Wido H.⁴  Robles-Dutenhefner, Patricia A.⁵ 

[1] Univ Fed Ouro Preto, Dept Quim, BR-35400000 Ouro Preto, MG, Brazil

[2] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil

[3] Univ Estadual Campinas, Fac Engn Quirn, BR-13083970 Campinas, SP, Brazil

[4] Univ Fed Parana, Dept Fis, BR-81531970 Curitiba, Parana, Brazil

[5] Univ Fed Minas Gerais, Dept Quim, BR-31270901 Belo Horizonte, MG, Brazil

关键词: Gold;    Palladium;    Gold-palladium;    Steam reforming of ethanol;    BTX oxidation;   

DOI  :  10.1016/j.jpowsour.2015.03.066

来源: Elsevier

【 摘 要 】

We described a versatile approach for the synthesis of Au/MCM-41, Pd/MCM-41 and Au-Pd/MCM-41 by the direct incorporation of the noble metals into the MCM-41 framework. The structural, textural and chemical properties were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), N-2-adsorption (BET and BJH methods), H-2-chemisorption, small angle X-ray scattering (SAXS), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The nanomaterials, being comprised of Au, Pd and Au-Pd nanoparticles and possessing high surface areas were applied as versatile and efficient catalysts in benzene, toluene and o-xylene (BTX) oxidation and in the steam reforming of ethanol for hydrogen production. The results revealed that the catalytic behavior in both processes was influenced by the experimental conditions and the nature of the catalyst employed. The Au-Pd/MCM-41 catalyst was the most active in the BTX total oxidation. On the basis of characterization data, it was proposed that the close contact between Pd and Au and the higher dispersion of Pd may be responsible for the enhanced activity of the bimetallic catalyst. However, the strong interaction between the noble metals did not improve the performance of the bimetallic catalyst in ethanol steart reforming, the Pd/MCM-41 catalyst being the most active and selective for hydrogen production. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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