Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu1−x,Znx)2(OH)2CO3 Precursor Catalyst for Methanol Synthesis,ChemCatChem

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Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu1−x,Znx)2(OH)2CO3 Precursor Catalyst for Methanol Synthesis
ChemCatChem ( IF 3.8 ) Pub Date : 2020-02-17 , DOI: 10.1002/cctc.201902286
Huayan Zheng ₁ , Nilesh Narkhede ₁ , Huacheng Zhang ₁ , Zhong Li ₁

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A new methodology has been demonstrated for the synthesis of a series of phase pure (Cu_1−x,Zn_x)₂(OH)₂CO₃ precursors by isomorphous substitution of Zn²⁺ in the malachite structure. By following the present protocol, it was possible to synthesize the pure phase (Cu_1−x,Zn_x)₂(OH)₂CO₃ with substitution level as high as x=0.5, which is better than the maximum possible value achieved by coprecipitation method, i. e. x=0.31. The isomorphous substitution by Zn²⁺ leads to the change in the morphology of malachite crystals from flake‐like to regular needle‐like shape with high Zn dispersion. The activity of the calcined catalysts was increased by ∼1.5–1.7 fold for the hydrogenation of syngas to methanol as compared with those prepared from the traditional coprecipitation route. The synergy between Cu and ZnO was further demonstrated quantitatively by characterization of the catalysts treated with syngas at 250 °C.

中文翻译：

定向的同构取代：制备富含锌的纯（Cu1-x，Znx）2（OH）2CO3甲醇合成前体催化剂的高效替代途径

通过孔雀石结构中Zn ²⁺的同晶取代，已经证明了一种用于合成一系列相纯的（Cu _{1- x}，Zn _x）₂（OH）₂ CO ₃前体的新方法。通过遵循本协议，可以合成取代度高达x = 0.5的纯相（Cu _1-_x，Zn _x）₂（OH）₂ CO ₃，这比通过共沉淀法 e。x＝ 0.31。Zn ²⁺的同晶取代导致孔雀石晶体的形态从片状变为具有高Zn分散度的规则针状形状。与传统共沉淀法制备的催化剂相比，煅烧后的催化剂将合成气加氢制甲醇的活性提高了约1.5-1.7倍。通过表征在250°C下用合成气处理的催化剂，可以进一步定量证明Cu和ZnO之间的协同作用。

更新日期：2020-02-17

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