Surface Modification of Pd/α-Si3N4 Catalysts Through the Solvent Used During Synthesis. Implications on the CO Chemisorption Properties and Catalytic Performances

摘要: Palladium catalysts supported on α-Si3N4 were prepared by impregnation with Pd(II)-acetate dissolved either in toluene or water. The mean metal particle size of ~0.5 wt% Pd was similar (~5 nm) and independent the way preparation. Nevertheless, two present very different chemisorption behaviour chemisorptive catalytic properties. Fourier transformed infrared (FTIR) spectra adsorbed CO at temperatures (ranging from room temperature to 300 °C) show a for both catalysts. While adsorption states Pd/α-Si3N4 are those generally measured silica and/or alumina palladium catalysts, chemisorbs less strongly water sites. catalyst obtained aqueous is much efficient methane total oxidation. It active stable: it deactivates after 3 h stream 650 °C. about same activity 1,3-butadiene hydrogenation stabilisation 20 But, shows better selectivity butenes. results discussed terms possible migration silicon atoms nitride support surface particles, when This not case an organic solvent.