253840 Effect of Storage Time On the Catalytic Activity of Gold for Selective CO Oxidation
253840 Effect of Storage Time On the Catalytic Activity of Gold for Selective CO Oxidation
Wednesday, October 31, 2012: 9:18 AM
302 (Convention Center )
Gold supported alumina catalysts were studied for selective CO oxidation, in order to provide appropriate H2 for PEM fuel cell. The catalysts were prepared by deposition-precipitation method using HAuCl4 as precursor of gold. The catalysts showed high activity at lower temperatures. The fresh catalysts were tested and after 1 year the activity tests were repeated. A considerable loss in the catalytic activity was observed, the maximum CO conversion decreased and the temperature to reach this conversion was higher. The loss of gold catalytic activity was attributed to the agglomeration of gold particles, which occurred spontaneously at room temperature, and may be favored to the presence of residual chloride from the preparation of the catalysts. The catalysts promoted with copper showed higher activity and a smaller loss of activity after 1 year of storage time. The interaction between gold and copper seemed to decrease to gold mobility, avoiding the agglomeration of gold particles.
See more of this Session: Fuel Processing for Hydrogen Production II
See more of this Group/Topical: Topical D: Accelerating Fossil Energy Technology Development Through Integrated Computation and Experimentation
See more of this Group/Topical: Topical D: Accelerating Fossil Energy Technology Development Through Integrated Computation and Experimentation