Synthesis and Catalytic Activity of Ni/Ce-MCM-41 Mesoporous Catalysts for Hydrogen Production
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Synthesis of Ce-MCM-41 Mesoporous Solids and Catalytic Evaluation of Ni/Ce-MCM-41 Catalysts for Hydrogen Production J. A. Wang1,*, J. C. Guevara1, L.F. Chen1, J. Salmones1, M. A. Valenzuela1, P. Salas2, F. H. Cao3, G. X. Yu4 1 ESIQIE, Instituto Politécnico Nacional, Col. Zacatenco, 07738 México D. F., Mexico 2 Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Apartado Postal 1-1010, 76000 Querétaro, Mexico 3 Chemical Engineering School, East China University of Science and Technology, 200237 Shanghai, P. R. China 4 School of Chemistry and Environmental Engineering, Jianghan University, 430056 Wuhan, P. R. China. ABSTRACT Ce-containing MCM-41 mesoporous materials with large surface area and ordered pore structure system have been possible to be synthesized through a surfactant-assisted approach. The textural properties and structural regularity of the materials varied with the Si/Ce molar ratio. It is found that the band at 970 cm-1 in the FTIR spectrum of the Ce-MCM-41 mesoporous materials might be used as an indicator of the formation of the Ce-O-Si bond and its intensity as a measure of a degree of cerium ion substitution in the framework of Si-MCM-41. When Ni was loaded on the Ce-MCM-41 support, the Ni/Ce-MCM-41 catalysts show high catalytic activity which has strong temperature dependence. The methane conversion over these catalysts reached 60-75 % with a 100 % selectivity towards hydrogen. Keywords: Hydrogen Production; Methane Catalytic Decomposition; Carbon Nanotube; CeMCM-41, Ni-based Catalysts. 1. INTRODUCTION Fuel cell technology is believed to be environmentally benign and it becomes particularly attractive in the low-carbon economic era. The current proton-exchange membrane fuel cells utilize hydrogen as energy source; however, the Pt electrode catalyst which is the core of the fuel cell device is very sensitive to carbon monoxide in the hydrogen steam, even 1 ppm CO may lead to Pt catalyst deactivation due to poisoning. To satisfy the essential requirements of fuel cell technology, hydrogen with ultra purity needs to be supplied. Therefore, production of hydrogen free of CO has received great attention [1-4]. To date, a number of approaches or processes for hydrogen production, for example, natural gas catalytic decomposition, steam reforming, photocatalytic decomposition of water and biomass gasification etc., have been developed [5-12]. Among these, methane catalytic decomposition (MCD) is a rather simple but very attractive approach because it not only produces COx-free (CO and CO2) hydrogen at a moderately endothermic condition [13-17], which eliminates the process for COx separation in the fuel cell application, but also
simultaneously produces carbon nanomaterials which have many potential applications in electronic, rubber and pollutant control industries. The essential factors of the catalysts used for hydrogen production via MCD route are the appropriate active sites and controllable channel geometry of the support [18]. Transition metals, like nickel a
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