Affiliation:
1. State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology, Box 98 15 Bei San Huan East Road Beijing 100029 China
2. Quzhou Institute for Innovation in Resource Chemical Engineering Quzhou 324000 China
3. Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical Technology Beijing 100029 China
Abstract
AbstractThe dynamic structure evolution of heterogeneous catalysts during reaction has gained great attention recently. However, controllably manipulating dynamic process and then feeding back catalyst design to extend the lifetime remains challenging. Herein, we proposed an entropy variation strategy to develop a dynamic CuZn−Co/HEOs catalyst, in which the non‐active Co nano‐islands play a crucial role in controlling thermal effect via timely capturing and utilizing reaction heat generated on the adjacent active CuZn alloys, thus solving the deactivation problem of Cu‐based catalysts. Specifically, heat sensitive Co nano‐islands experienced an entropy increasing process of slowly redispersion during the reaction. Under such heat dissipation effect, the CuZn−Co/HEOs catalyst exhibited 95.7 % ethylene selectivity and amazing long‐term stability (>530 h) in the typical exothermic acetylene hydrogenation. Aiming at cultivating it as a catalyst with promising industrial potential, we proposed a simple regeneration approach via an entropy decreasing process.