纳米片层二硫化钼负载PtCo双金属催化甲醇水相重整制氢

Catalytic performance of bimetallic PtCo supported on nanosheets MoS₂ in aqueous-phase reforming of methanol to hydrogen

摘要: 采用水热法合成了层数只有六层的纳米片层二硫化钼（MoS₂），并进一步负载Pt和PtM双金属（M=Ru、Pd、Co和Ni），用于催化甲醇水相重整制氢反应。结果表明，PtCo/MoS₂对于甲醇水相重整具有最优异的催化性能，在220℃下产氢转换频率（TOF）为37142 h^-1。氮气吸附-脱附等温线、透射电子显微镜（TEM）、程序升温还原（H₂-TPR）以及X射线光电子能谱（XPS）等表征结果表明，PtCo/MoS₂中金属还原程度高，且Pt与载体MoS₂形成了强电子相互作用，使缺电子的Pt有利于吸附活化甲醇，并进一步促进甲醇重整反应。

Abstract: Nanosheets MoS₂ with only 6 layers have been successfully synthesized by hydrothermal method and used as support to prepare a series of Pt and PtM (M=Ru, Pd, Co and Ni) bimetallic catalysts for low temperature aqueous-phase reforming of methanol (APRM) to produce hydrogen. Among those catalysts, PtCo supported on MoS₂ nanosheets catalyst exhibited the best performance, and its turnover frequency (TOF) of H₂ formation reached 37142 h^-1 at 220℃. The N₂ adsorption-desorption, TEM, H₂-TPR and XPS results showed that PtCo/MoS₂ performed the highest reduction degree, and the strong electronic interaction between Pt and MoS₂ enhanced the adsorption and activation of methanol on the electron-deficient Pt, thus promoted the methanol reforming.