Adsorption of methane as well as co-adsorption of methane and O2 on NirAl2O3 catalyst have been studied by in situFT-IR spectroscopy. The reaction start temperature measurements indicate that the methane partial oxidation occurs at2308C. As the reduced NirAl2O3 was exposed to pure CH4, two bands for adsorbed methane were observed at 3005 and2998 cmy1, respectively, which was confirmed by the appearance of two bands at 2242 and 2237 cmy1 when CD4 wasused. During temperature programmed _TP. dynamic process _in the presence of CH4., the intensities of the bands at 3005and 2998 cmy1 increased with increase in temperature, indicating that the amount of adsorbed methane increases withincreasing temperature, which is indicative of chemisorption of methane. During TP dynamic process _in the co-presence ofCH4 and O2., two forms of chemisorbed methane are observed. The amount of chemisorbed methane increased withincreasing temperature. At 2508C, the intensity of the band at 3015 cmy1 for gaseous methane decreased remarkably and atthe same time, CO, H2, CO2 and H2O were detected in the gas phase, indicating that the partial oxidation of CH4 occurs,which is in good agreement with the reaction start temperature observed above. These results suggest that the dissociation ofchemisorbed methane in the participation of chemisorbed oxygen is a key step for methane partial oxidation.

The adsorption of H2 as well as coadsorption of H2 and CO on Rh2Co2/A1203 catalyst has beenstudied using in situ FTIR dynamic method. The band at 1959 cm-1 for Rh--H vibration on Rh2Co2/A1203(w=3%) was observed and increased in intensity without shift to low wavenumber as Hz coverage increase. In the dynamic process of CO adsorption on Rh2Coz/AI203 preadsorbing H2-TP(in H2 and CO), the bands for the gem-dicarbonyl species, the linear CO species and the bridge earbonyl species were lost and the bands for carbonyl hydrides were observed at 293K. At about 473K, the C-O bond of rhodium carbonyl hydrides starts to break down and CO hydrogenation reaction occurs. It can be concluded that the scission of C-O bond under the conditions of CO hydrogenation is via rhodium carbonyl hydrides.

The forms of chemiso rption of H2 over Rh-V

本文报导了以高眭能稀土储氧材料为基础、制各出高眭能高耐久眭的Pt-Rh型三效催化剂，经过8万公里快速老化实验，催化剂仍保持高活眭和高稳定眭。

A new monolithic Ni/CeO2-ZrO2/γ-Al2O3 catalyst for combined partial oxidation andCO2 reforming of methane was prepared. The result shows that the addition of O2 to the feed canimprove the activity of the catalyst and adjust the H2/CO ratio of the productive gases.