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α-MoC负载Pt制备稳定的低温制H2催化剂
作者:小柯机器人 发布时间:2021/1/24 19:52:55

北京大学Ding Ma研究团队通过α-MoC负载Pt制备一种稳定的低温制H2催化剂。 相关研究成果发表在2021年出版的《自然》。

水气变换(WGS)反应是工业上重要的纯氢(H2)来源,而一氧化碳和水则是其代价。这种反应对燃料电池应用很有意义,但需要在低温下具有持久性和高活性的WGS催化剂。

该文中,研究人员证明了孤立的铂原子(Pt1)和亚纳米铂团簇(Ptn)稳定在α-碳化钼(α-MoC)上形成的(Pt1–Ptn)/α-MoC结构即使在313K也催化WGS反应,并且确定了涉及一氧化碳直接解离的制氢途径。研究人员发现,用Pt1和Ptn物种填充α-MoC表面非常关键,这可防止载体氧化而导致催化剂失活,如金/α-MoC(参考文献4)所示,同时使本系统具有高稳定性和高金属标准化周转数,即4300000摩尔氢每摩尔铂。

研究人员预计,在设计高活性和稳定的催化剂以有效活化水和一氧化碳等重要分子以生产能源方面,这里展示的策略将是关键。

附:英文原文

Title: A stable low-temperature H 2 -production catalyst by crowding Pt on α-MoC

Author: Xiao Zhang, Mengtao Zhang, Yuchen Deng, Mingquan Xu, Luca Artiglia, Wen Wen, Rui Gao, Bingbing Chen, Siyu Yao, Xiaochen Zhang, Mi Peng, Jie Yan, Aowen Li, Zheng Jiang, Xingyu Gao, Sufeng Cao, Ce Yang, A. Jeremy Kropf, Jinan Shi, Jinglin Xie, Mingshu Bi, Jeroen A. van Bokhoven, Yong-Wang Li, Xiaodong Wen, Maria Flytzani-Stephanopoulos, Chuan Shi, Wu Zhou, Ding Ma

Issue&Volume: 2021-01-20

Abstract: The water–gas shift (WGS) reaction is an industrially important source of pure hydrogen (H2) at the expense of carbon monoxide and water1,2. This reaction is of interest for fuel-cell applications, but requires WGS catalysts that are durable and highly active at low temperatures3. Here we demonstrate that the structure (Pt1–Ptn)/α-MoC, where isolated platinum atoms (Pt1) and subnanometre platinum clusters (Ptn) are stabilized on α-molybdenum carbide (α-MoC), catalyses the WGS reaction even at 313 kelvin, with a hydrogen-production pathway involving direct carbon monoxide dissociation identified. We find that it is critical to crowd the α-MoC surface with Pt1 and Ptn species, which prevents oxidation of the support that would cause catalyst deactivation, as seen with gold/α-MoC (ref. 4), and gives our system high stability and a high metal-normalized turnover number of 4,300,000 moles of hydrogen per mole of platinum. We anticipate that the strategy demonstrated here will be pivotal for the design of highly active and stable catalysts for effective activation of important molecules such as water and carbon monoxide for energy production.

DOI: 10.1038/s41586-020-03130-6

Source: https://www.nature.com/articles/s41586-020-03130-6

 

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/