Volume 59, Issue 48 pp. 21613-21619
Research Article

High-Density and Thermally Stable Palladium Single-Atom Catalysts for Chemoselective Hydrogenations

Ying Ma

Ying Ma

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

University of Chinese Academy of Sciences, Beijing, 100049 China

These authors contributed equally in this work.

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Dr. Yujing Ren

Dr. Yujing Ren

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

These authors contributed equally in this work.

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Dr. Yanan Zhou

Dr. Yanan Zhou

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA

School of Chemical Engineering, Sichuan University, Chengdu, 610065 China

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Dr. Wei Liu

Dr. Wei Liu

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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Dr. Walid Baaziz

Dr. Walid Baaziz

Institute de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, CNRS-University of Strasbourg, 23, rue du Loess, 67037 Strasbourg Cedex 08, France

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Prof. Dr. Ovidiu Ersen

Prof. Dr. Ovidiu Ersen

Institute de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, CNRS-University of Strasbourg, 23, rue du Loess, 67037 Strasbourg Cedex 08, France

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Dr. Cuong Pham-Huu

Dr. Cuong Pham-Huu

Institute of Chemistry and Processes for Energy, Environment and Health (ICPEES), UMR 7515, CNRS-University of Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France

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Dr. Mark Greiner

Dr. Mark Greiner

Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34–36, Mülheim an der Ruhr, 45470 Germany

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Prof. Dr. Wei Chu

Prof. Dr. Wei Chu

School of Chemical Engineering, Sichuan University, Chengdu, 610065 China

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Prof. Dr. Aiqin Wang

Corresponding Author

Prof. Dr. Aiqin Wang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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Prof. Dr. Tao Zhang

Prof. Dr. Tao Zhang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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Prof. Dr. Yuefeng Liu

Corresponding Author

Prof. Dr. Yuefeng Liu

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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First published: 12 August 2020
Citations: 151

In memory of Professor Dang Sheng Su

Graphical Abstract

A Pd1/α-MoC catalyst with high mass loading could endure harsh reducing/reacting atmosphere up to 400 °C without any observable aggregation of single atoms. A pathway is thus provided to decouple the hydrogenation activity and stability of single-atom catalysts.

Abstract

Single-atom catalysts (SACs) have shown superior activity and/or selectivity for many energy- and environment-related reactions, but their stability at high site density and under reducing atmosphere remains unresolved. Herein, we elucidate the intrinsic driving force of a Pd single atom with high site density (up to 5 wt %) under reducing atmosphere, and its unique catalytic performance for hydrogenation reactions. In situ experiments and calculations reveal that Pd atoms tend to migrate into the surface vacancy-enriched MoC surface during the carburization process by transferring oxide crystals to carbide crystals, leading to the surface enrichment of atomic Pd instead of formation of particles. The Pd1/α-MoC catalyst exhibits high activity and excellent selectivity for liquid-phase hydrogenation of substituted nitroaromatics (>99 %) and gas-phase hydrogenation of CO2 to CO (>98 %). The Pd1/α-MoC catalyst could endure up to 400 °C without any observable aggregation of single atoms.

Conflict of interest

The authors declare no conflict of interest.

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