Ni对Cu/ZnO基甲醇裂解催化剂的促进机制

通过XRD，BET，In-situ XPS等表征技术对Cu/ZnO基甲醇裂解制氢催化剂进行 了详细的研究。XRD结果表明，Cu-Zn合金的生成是Cu/ZnO基催化剂在反应初期快速 失活的主要原因；XRD，BET和N_2O滴定实验结果表明，Ni助剂可能是通过提高 Cu~0活性物种的分散度并维持Cu~0活性物种在催化反应过程中的稳定性而使 Cu/Zn/Ni催化剂的活性及稳定性大幅度提高。In-situ XPS结果表明，Ni助剂的加 入可以诱导Cu/Zn/Ni催化剂表面在甲醇裂解反应过程中出现Cu~+，从而由 Cu~0/Cu~+共同构成催化剂的活性中心，并最终导致Cu/Zn/Ni催化剂的高活性。

Mechanism of Cu/ZnO Based Catalysis for Methanol Decomposition Promoted by Nickel

XRD, BET and In-situ XPS techniques were used to study the performance of Cu/ZnO based catalysts for methanol decomposition. XRD studies indicated that the formation of Cu-Zn alloys was the major reason for the quickly deactivation of Cu/Zn catalyst for methanol decomposition at the initial stage of the reaction. XRD, BET and N 2O titration results confirmed that nickel additive could increase the dispersity of active Cu 0 species during the catalytic process and maintain the stability during the reaction. In-situ XPS studies confirmed that the active center in Cu/Zn/Ni catalyst was Cu 0 and/or Cu + species, in which Cu + was formed during the reaction.