Catalysis

Contents xi
4.6 Preparation of Supported Bimetallic Catalysts Containing Gold . . . 105
4.6.1 Introduction 105
4.6.2 Methods without interaction between precursors
in solution 106
4.6.2.1 Co-impregnation 106
4.6.2.2 Co-adsorption of cations 106
4.6.2.3 Co-deposition-precipitation 107
4.6.2.4 Photoreduction 107
4.6.3 Redox methods for preparing bimetallic catalysts 107
4.6.4 Use of a bimetallic precursor 108
4.6.4.1 Adsorption of bimetallic molecular clusters 108
4.6.4.2 Deposition of bimetallic colloids 109
4.6.4.3 Deposition of dendrimer-stabilised
bimetallic particles 110
4.6.4.4 Low-energy cluster deposition 110
4.7 Influence of the Thermal Treatment on Gold Particle Size 110
4.7.1 Nature of the gas Ill
4.7.2 Gas flow rate and sample weight Ill
4.7.3 Effect of the temperature of thermal treatment Ill
4.8 Effect of Conditions of Storage on Size of Gold Particles 112
4.9 Conclusion 113
References 113
Chapter 5 Chemisorption of Simple Molecules on Gold 121
5.1 Introduction: Chemisorption and Catalysis 121
5.2 Interaction of Oxygen with Gold 122
5.2.1 Interaction with gold clusters 122
5.2.2 Chemisorption of oxygen on gold surfaces 127
5.2.3 Finale 133
5.3 Chemisorption of Carbon Monoxide on Gold 134
5.3.1 Reaction of carbon monoxide with gaseous gold clusters . . 134
5.3.2 Chemisorption of carbon monoxide on massive
gold surfaces 136
5.3.3 The bonding of carbon monoxide to gold and results of
DFT calculations 139
5.3.4 Chemisorption of carbon monoxide on supported
gold catalysts 141
5.4 Chemisorption of the Oxides of Nitrogen on Gold Surfaces 149
5.5 The Chemisorption of Hydrogen and of Other Molecules on Gold . . 150
5.5.1 Hydrogen 150
5.5.2 Other molecules 153
Appendix: Introduction to Density Functional Theory 154
References 156
Chapter 6 Oxidation of Carbon Monoxide 161
6.1 Introduction 161