Synthesis of mesoporous Al2O3 macrospheres using the biopolymer chitosan as a template:: A novel active catalyst system for CO2 reforming of methane

A new and simple method to prepare alumina containing mainly mesopores is described. This alumina has a high surface area (464 m(2)/g) and a large pore volume ranging from about 0.35 to 0.65 cm(3)/g, The present method was developed using a biopolymer (chitosan) and Al solution. The Al-chitosan solution was added to NH4OH solution in the form of drops. A hybrid macrosphere compound of aluminum hydroxide and organic polymer is formed. Through polymer elimination by thermal treatment, porous Al2O3 spheres with a high specific surface area are obtained. The Ni-impregnated Al2O3 spheres showed a high catalytic activity and stability for dry reforming of methane at 650 degrees C and a CH4/CO2 = 1 molar ratio. (C) 2005 Elsevier B.V. All rights reserved.