title: Enhanced stability of CaO and/or La2O3 promoted Pd/Al2O3 egg-shell catalysts in partial oxidation of methane to syngas.
abstract: An egg-shell Pd/Al2O3 catalyst showed higher activity than a regular Pd/Al2O3 catalyst in the partial oxidation of methane to syngas, but a common problem of this reaction is the catalyst deactivation on stream. We attempted to modify the egg-shell catalyst via impregnation with some metal oxide additives. Although the addition of MgO did not show any beneficial effect, the addition of CaO and/or La2O3 significantly improved the stability due to the suppression of carbon deposition and phase transformation of the Al2O3 support. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and thermogravimetric analysis (TGA).
authors.affiliation: Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
authors.forename: Jinlong
authors.initials: J
authors.lastname: Wang
authors.forename: Hongbo
authors.initials: H
authors.lastname: Yu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Ma
authors.forename: Shenghu
authors.initials: S
authors.lastname: Zhou
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D000818:Animals; D017610:Calcium Compounds / Q000737:chemistry*; D002384:Catalysis; D004528:Egg Shell / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D007854:Lead / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry; D008697:Methane / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D007854:Lead; D008277:Magnesium Oxide; C103829:lanthanum oxide; D007811:Lanthanum; C016538:lime; D000537:Aluminum Oxide; D008697:Methane