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

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37142h^-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。

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.