State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Centre, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China
Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, United States
Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai, China
多相催化剂的表面结构与其催化性能密切相关。目前对结构改性的努力主要集中在改进催化剂合成细节上。在这里，我们揭示了一种诱导活化策略，通过在活化阶段控制还原剂的组成来控制催化剂表面重建过程。发现在 300 °C 和大气压下将商业 Cu/ZnO/Al 2 O 3催化剂暴露于H 2 /H 2 O/CH 3 OH/N 2混合物中会加速 ZnO x物质向金属表面的迁移。铜0纳米粒子通过吸附质诱导的强金属-载体相互作用。这种形态演变将长期稳定性提高了三倍，并导致更丰富的 Cu-ZnO x界面位点对甲醇蒸汽重整反应的催化活性提高了两倍。
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Induced activation of the commercial Cu/ZnO/Al2O3 catalyst for the steam reforming of methanol
The surface structure of heterogeneous catalysts is closely associated with their catalytic performance. Current efforts for structural modification mainly focus on improving the catalyst synthesis details. Here we reveal an induced activation strategy to manipulate the catalyst surface reconstruction process by controlling the composition of reducing agents at the activation stage. Exposing the commercial Cu/ZnO/Al2O3 catalyst to a H2/H2O/CH3OH/N2 mixture at 300 °C and atmospheric pressure is found to accelerate the migration of ZnOx species onto the surface of metallic Cu0 nanoparticles via an adsorbate-induced strong metal–support interaction. Such a morphological evolution improves the long-term stability by threefold and results in more abundant Cu–ZnOx interfacial sites with catalytic activity enhanced by twofold towards the methanol steam reforming reaction.
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