Ensembled Ptδ+ species on Beta zeolites for efficient preferential oxidation of CO in H2

IF 11.6 Q1 CHEMISTRY, PHYSICAL
Jia Shen, Qian Xiang, Lichuan Song, Yake Lou, Jiajie Ye, Xiao Yang, Yanglong Guo, Wangcheng Zhan, Li Wang, Xiao-Ming Cao, Xuan Tang, Sheng Dai, Yun Guo
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引用次数: 0

Abstract

The preferential oxidation of CO in H2-rich environments (CO-PROX) is one of the most promising strategies for purifying H2. However, developing catalysts with low noble metal loadings that can effectively operate within a wide temperature range remains a significant challenge. Here, we synthesized ensembled Ptδ+ species on Beta zeolite (0.36 wt % Pt) through a reduction treatment. This catalyst achieved 100% CO conversion in CO-PROX across the temperature range of 25°C–220°C. The outstanding performance of this catalyst originates from the temperature-dependent dual mechanisms. Specifically, the ensembled Ptδ+ species weaken the adsorption strength of CO and enhance activation in O2 at elevated temperatures. Moreover, these Ptδ+ species play a crucial role in facilitating the adsorption and dissociation of H2 at lower temperatures, enabling it to react with O2 and form –OH species. These –OH species readily react with CO, overcoming the challenges associated with O2 activation.

Abstract Image

β沸石上的Ptδ+物质对CO在H2中的有效优先氧化
富H2环境中CO的优先氧化(CO- prox)是最有前途的H2净化策略之一。然而,开发低贵金属负载且能在宽温度范围内有效工作的催化剂仍然是一个重大挑战。本文通过还原处理,在β沸石(0.36 wt % Pt)上合成了Ptδ+基团。该催化剂在25°C - 220°C的温度范围内,在CO- prox中实现了100%的CO转化。该催化剂的优异性能源于温度依赖的双机制。综上所示的Ptδ+物质在高温下降低了CO的吸附强度,增强了对O2的活化。此外,这些Ptδ+在促进H2在低温下的吸附和解离中起着至关重要的作用,使其能够与O2反应并形成-OH物质。这些-OH物质很容易与CO反应,克服了与O2活化相关的挑战。
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来源期刊
CiteScore
10.50
自引率
6.40%
发文量
0
期刊介绍: Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.
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