title: Efficient and robust reforming catalyst in severe reaction conditions by nanoprecursor reduction in confined space.
abstract: The in situ autocombustion synthesis route is shown to be an easy and efficient way to produce nanoscaled nickel oxide containing lanthanum-doped mesoporous silica composite. Through this approach, ~3 nm NiO particles homogeneously dispersed in the pores of silica are obtained, while lanthanum is observed to cover the surface of the silica pore wall. Subsequent reduction of such composite precursors under hydrogen generates Ni(0) nanoparticles of a comparable size. Control over the size and size distribution of metallic nanoparticles clearly improved catalytic activity in the methane dry reforming reaction. In addition, these composite materials exhibit excellent stability under severe reaction conditions. This was achieved through the presence of LaOx species, which reduced active-site carbon poisoning, and the confinement effect of the mesoporous support, which reduced metallic particle sintering.
authors: Université de Lille Nord de France, 59 000 Lille (France), CNRS UMR-8181, Unité de Catalyse et de Chimie du Solide, UCCS, 59655 Villeneuve d'Ascq (France).
authors: Jean-Philippe
authors: JP
authors: Dacquin
authors: Djamila
authors: D
authors: Sellam
authors: Catherine
authors: C
authors: Batiot-Dupeyrat
authors: Asma
authors: A
authors: Tougerti
authors: Daniel
authors: D
authors: Duprez
authors: Sébastien
authors: S
authors: Royer
mesh_terms: D002384:Catalysis; D007811:Lanthanum / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D010084:Oxidation-Reduction; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature
chemical_list: D007811:Lanthanum; D012822:Silicon Dioxide; D009532:Nickel; D008697:Methane
keywords: in situ crystallization; mesoporous materials; nickel nanoparticles; oxide nanoclusters; reforming catalyst