Improvement of intermetallic catalysts using surface segregation of third elements demonstrated by adding Cu to CoGa for selective hydrogenation of propyne

IF 4.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Sena Matsushita , Kazuyuki Iwase , Takayuki Kojima
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引用次数: 0

Abstract

Intermetallic compounds can be novel catalysts due to unique atomic-ordered arrangements and electronic structures. However, their elemental set, composition, and crystal structure cannot be freely selected, which limits the tunability of catalytic properties. In this study, we demonstrated an improvement in catalytic properties by adding a third element to intermetallic catalysts using selective hydrogenation of propyne by CoGa with Cu addition as a model reaction and catalyst. The selectivity was drastically improved by 5 %Cu addition. The surface segregation of Cu was revealed and considered to result in an ensemble effect for the selectivity improvement. The addition of NiGa to Cu does not result in segregation. Since Cu-Ni is miscible, but Cu-Co is immiscible, the third element should likely be immiscible with one component of intermetallic catalysts to utilize a segregation effect for improving catalytic properties.

Abstract Image

在CoGa中添加Cu对丙烯选择性加氢的金属间催化剂的表面分离改进
金属间化合物因其独特的原子有序排列和电子结构而成为新型催化剂。然而,它们的元素集、组成和晶体结构不能自由选择,这限制了催化性能的可调性。在本研究中,我们以CoGa选择性加氢丙炔和Cu作为模型反应和催化剂,通过在金属间催化剂中添加第三元素,证明了催化性能的改善。添加5% Cu后,选择性显著提高。发现了Cu的表面偏析,并认为这是提高选择性的系综效应。在Cu中加入NiGa不会产生偏析。由于Cu-Ni是可混溶的,而Cu-Co是不可混溶的,因此第三种元素应该可能与金属间催化剂的一种组分不混溶,以利用分离效应来改善催化性能。
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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