Planar growth, facet-oriented La2O3 (003) in CuLa catalysts: Enhancement in charge transport and water adsorption for methanol steam reforming

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-11 DOI:10.1016/j.fuel.2024.133612

Qingli Shu, Yujing Xiang, Qi Zhang

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Abstract

The dispersion of active components and the strong metal-support interactions (SMSI) are closely associated with the lifespans and activities of catalysts in methanol steam reforming (MSR). In this study, a copper-based (Cu-based) catalyst featuring a unique lamellar structure and (003) facet for lanthanum oxide (La₂O₃) was prepared by the molten salt impregnation method for the first time. Compared to the unmodified Cu/γ-Al₂O₃/Al catalyst, the lifetime was enhanced eightfold, reaching 150 h. La₂O₃ can lead to the formation of a fence structure, which enhances the dispersion of Cu through a domain-limiting effect. Additionally, the Cu atoms near the Cu(111)/La₂O₃(003) interface exhibit a higher degree of electron loss compared to La₂O₃ with polycrystalline facets. This characteristic contributes to the enhanced water adsorption and dissociation capacity of CuLa catalysts. These two factors lead to superior catalytic activity and lifespan of CuLa-2 h. This study offers insights into catalyst microstructure and green chemistry.

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CuLa 催化剂中的平面生长、面向切面的 La2O3 (003)：提高甲醇蒸汽转化过程中的电荷传输和水吸附能力

甲醇蒸汽转化（MSR）催化剂的寿命和活性与活性组分的分散和强金属-支撑相互作用（SMSI）密切相关。本研究首次采用熔盐浸渍法制备了一种铜基（Cu-based）催化剂，该催化剂具有独特的片层结构和氧化镧（La2O3）的（003）面。与未改性的 Cu/γ-Al2O3/Al 催化剂相比，其寿命提高了八倍，达到 150 小时。La2O3 可形成栅栏结构，通过限域效应提高铜的分散性。此外，与具有多晶面的 La2O3 相比，Cu(111)/La2O3(003) 界面附近的铜原子表现出更高的电子损耗程度。这一特性增强了 CuLa 催化剂对水的吸附和解离能力。这两个因素导致 CuLa-2 h 具有更高的催化活性和更长的使用寿命。这项研究为催化剂微观结构和绿色化学提供了新的见解。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.