On the characteristics and hydrogen adsorption properties of a Pd/γ-Al2O3 prepared by sol-gel method

Alumina modified palladium prepared by the sol-gel method was characterized by nitrogen adsorption, transmission electron (TEM), thermal gravimetric (TGA) and X-ray diffraction (XRD). Gamma alumina (gamma-Al2O3) modified palladium exhibited ink bottle shape mesopore characteristics with pore diameter of 15 nm. Pd particles with diameter ranging from 5 to 15 nm were well dispersed in the porous alumina matrix. The particles were well crystallized at temperature of 700 degrees C. TGA results show that Pd precursors decomposed at temperature between 300 and 400 degrees C, while copolymer was not completely removed until 500 degrees C. Adsorption of H-2 on coated Pd/gamma-Al2O3 zeolite beads was improved substantially with time at temperature of 300 degrees C. (c) 2005 Elsevier Inc. All rights reserved.