Aluminum chloride for accelerating hydrogen generation from sodium borohydride

International audienc

Fluorinated cobalt for catalyzing hydrogen generation from sodium borohydride

International audienc

Ethanol oxidative steam reforming over Ni-based catalysts

Oxidative steam reforming of ethanol for hydrogen prodn. in order to feed a solid polymer fuel cell (SPFC) has been studied over several catalysts at on board conditions (a molar ratio of H2O/EtOH and of O2/EtOH equal to 1.6 and 0.68 resp.) and a reforming temp. between 923 and 1073 K. Two Ni (11 and 20 wt.%)/Al2O3 catalysts and five bimetallic catalysts, all of them supported on Al2O3, were tested. The bimetallic catalysts were Ni (approx. 20 wt.%) based catalysts doped with Cr (0.65 wt.%), Fe (0.6 wt.%), Zn (0.7 wt.%) or Cu (0.6 and 3.1 wt.%). The results in terms of H2 prodn. and CO2/COx ratio obtained over Ni-based catalysts supported on Al2O3 are compared with those obtained over Ni-Cu/SiO2 and Rh/Al2O3 catalysts reported in our previous works. Tendencies of the product selectivities are analyzed in the light of the reaction network proposed

Cobalt (II) salts, performing materials for generating hydrogen from sodium borohydride

International audienc

Cobalt, a controversial but efficient metal catalyst in the solvolytic hydrogen generation from sodium borohydride and ammonia borane

International audienc

Cobalt, a controversial but efficient metal catalyst in the solvolytic hydrogen generation from sodium borohydride and ammonia borane

International audienc

Enhanced redox catalysis of electrochemical alcohol oxidation in alkaline medium by using Pt-Cu/C catalyst

In electrochemical alcohol oxidation reactions catalysed by supported Pt-based nanoparticles, the catalytic performance is highly correlated with the electron density accumulated over the metal's surface. The highly electronegative nature of Pt, affects the catalytic performance by accumulating electrons generated over the oxidative reaction on the Pt surface. It was found that alloying Cu to Pt enhances greatly the catalyst's activity and robustness. This enhancement is due to the redox reaction of Cuδ+ species into Cu0 with the electrons generated during the reaction. Here, we show that an oxidative pretreatment of the carbon support XC-72R with HNO3 or H2O2 can further boost the catalysis of alcohol oxidation. This is mainly explained by the effect of enriched O-containing functional groups introduced in the support materials, which stabilize the presence of Cuδ+ species in the bimetallic Pt-Cu nanoparticles. This process increases the hydrophilic wettability, which enables more adsorption of reactant molecules and hydroxide ions over the catalyst's surface, as demonstrated by DFT calculations. The proposed catalytic system is applicable to a variety of substrates, including methanol, ethanol, isopropanol and sorbitol. Our work emphasizes the importance of support's modification in tuning the interaction within the bimetallic nanoparticles and thus enhancing the electrocatalytic oxidation reactions’ activity. © 2022 Elsevier B.V.FALS

Au-Pd Separation Enhances Bimetallic Catalysis of Alcohol Oxidation

10.1038/s41586-022-04397-7Natur