Abstract The preparation by physical coating of a bifunctional core-shell-structured catalyst (CZZr@S-11), using CuO-ZnO-ZrO 2 (CZZr) as metallic function and SAPO-11 (S-11) as acid function, has been studied. The effects of calcination temperature and mass ratio between the metallic and acid functions (M/A) on their kinetic behavior for the synthesis of DME from syngas and CO 2 feeds has been assessed. The reaction indices considered have been: the conversion of CO x (CO + CO 2 ) and CO 2 ; yields and selectivities of dimethyl ether (DME), methanol and hydrocarbons; and stability. The experiments have been carried out in a fixed-bed reactor (275 °C, 30 bar). The CZZr@S-11 catalyst prepared under suitable conditions (calcination at 400 °C and M/A of 1/2), shows better reaction indices than the hybrid catalyst (CZZr/S-11), prepared by physical mixture of the individual functions, which is explained by the advantages of the core-shell structure, especially interesting for the valorization of CO 2 .

中文翻译：

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在核壳结构的 CuO-ZnO-ZrO 2 @SAPO-11 催化剂上由 CO 和 CO 2 直接合成二甲醚

摘要 以CuO-ZnO-ZrO 2 (CZZr)为金属官能团，SAPO-11(S-11)为酸官能团，通过物理包覆制备双功能核壳结构催化剂(CZZr@S-11)，具有被研究过。已经评估了煅烧温度和金属和酸官能团之间的质量比 (M/A) 对其从合成气和 CO 2 进料合成 DME 的动力学行为的影响。所考虑的反应指标是：CO x (CO + CO 2 ) 和 CO 2 的转化率；二甲醚 (DME)、甲醇和烃的产率和选择性；和稳定性。实验在固定床反应器 (275 °C, 30 bar) 中进行。CZZr@S-11 催化剂在合适的条件下（400 °C 煅烧，M/A 为 1/2），表现出比混合催化剂（CZZr/S-11）更好的反应指数，