Surface modification of Ni catalysts with trace Pt for oxidative steam reforming of methane

Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

“…The temperature on Ni(N, 10.6) reached about 1350 K at W/F = 0.04 gh/mol ( Table 2, entry 1). This behavior can be explained by separation of the reaction zones for combustion and reforming in oxidative steam reforming of methane, as reported previously [10]. In the presence of gas-phase oxygen near the catalyst bed inlet, the Ni species is oxidized and is active only for methane combustion, which increased the catalyst bed temperature drastically.…”

“…This result indicates that the synergy between Pd and Ni decreases the bed temperature and suppresses the hot-spot formation. According to our previous reports, the catalytic performance and bed temperature profile on bimetallic catalysts in oxidative steam reforming of methane are strongly influenced by the structure of 6 bimetallic particles and by the preparation method [7][8][9][10][11][12]. Therefore, catalysts prepared by different methods were evaluated in oxidative steam reforming of methane.…”

“…Considering the high cost and limited availability of noble metals, the main component should be nickel. Therefore, our group has been developing Ni-based catalysts modified with a small amount of noble metal for oxidative reforming of methane with high resistance to hot-spot formation [7][8][9][10][11][12]. Here, one strategy is the combination of high reducibility of noble metals with high reforming activity of Ni.…”

“…Here, one strategy is the combination of high reducibility of noble metals with high reforming activity of Ni. The Pt-Ni and Pd-Ni bimetallic catalysts supported on γ-Al 2 O 3 were investigated and the relation between the structure of bimetallic particles and the resistance to hot-spot formation in oxidative reforming of methane has been reported [7][8][9][10][11][12]. Here, we tested the bimetallic catalysts supported on α-Al 2 O 3 with larger Ni loading amount, which will be more applicable to a practical process.…”

Preparation of Highly Dispersed Ni Catalysts for H₂ Production for Polymer Electrolyte Fuel Cells

“…X-ray absorption fine structure (XAFS) analyses of both Ru and Ni in 0.5 wt% Ru _ Ni0.5/Mg2.5(Al)O catalysts suggest that Ru metal species were finely dispersed on or in the surface layer of the Ni metal particles 46) . Similarly, surface modification of Ni catalysts with trace Pt was much more efficiently achieved by the sequential impregnation method (Pt/Ni) than the co-impregnation method (Pt Ni) on γ-Al2O3 in the oxidative reforming of CH4 47) . Therefore, the catalytic property of Ni metal was enhanced by the loading of noble metal, probably mainly due to the formation of finely dispersed Ni metal particles and also to the synergy between Ni metal and noble metal on the surface of fine Ni metal particles.…”