通过层状双氢氧化物的拓扑变换在中尺度上操纵钴铜双金属结构

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-02-25 DOI:10.1002/aic.18784

Qi Ping, Yujing Hu, Jian Zhang, Zhe An, Xin Shu, Hongyan Song, Yanru Zhu, Jing He

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引用次数: 0

摘要

含有双金属成分的层状双氢氧化物（LDHs）的拓扑转化是制备双金属催化剂的一种有效方法，但由于其机理不明确，存在双金属结构不可控和催化活性位点不可控的问题。这项工作证明了通过简单地改变LDHs的长径比或Cu/Co分布（一个在层内，另一个在层间）来操纵CuCo结构，从而提供(i)纯Janus Cu-Co颗粒或良好合金的CuCo颗粒和（ii）与Janus Cu-Co，单金属Co或单金属Cu共存的CuCo合金。揭示了拓扑变换的中尺度关键因素。在合成气转化过程中，对Cu-Co位点亲和良好的Cu-Co和Janus Cu-Co颗粒的选择性分别达到49.3%和43.2%，C2+醇分数为>；94%。而单金属Co和Cu的存在分别通过促进烃类和甲醇的生成来抑制醇选择性和抑制C2+醇组分。

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Manipulating bimetal structure of CuCo at mesoscale via topological transformation of layered double hydroxides

Topological transformation of layered double hydroxides (LDHs) containing bimetal components is a powerful method for producing bimetal catalysts, but suffers from uncontrollable bimetal structures and catalytically active sites due to the indistinct mechanism. This work demonstrates the manipulation of CuCo structure by simply changing the aspect ratio or Cu/Co distribution (one in layer and the other in interlayer) of LDHs, affording (i) exclusive Janus Cu-Co particles or well-alloyed CuCo particles and (ii) CuCo alloy with Janus Cu-Co, monometallic Co, or monometallic Cu coexisting. The mesoscale key factor in the topological transformation is revealed. In the syngas conversion, the selectivity to alcohol reaches 49.3% and 43.2% with C₂₊ alcohol fraction of >94% on well-alloyed CuCo and Janus Cu-Co particles with good affinity of Cu-Co sites. But the presence of monometallic Co or Cu suppresses alcohol selectivity or C₂₊ alcohol fraction by facilitating the production of hydrocarbons or methanol, respectively.

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.