Identification of Active Sites on High-Performance Pt/Al2O3Catalyst for Cryogenic CO Oxidation

Yang Chen; Yingxin Feng; Lin Li; Jingyue Liu; Xiaoli Pan; Wei Liu; Fenfei Wei; Yitao Cui; Botao Qiao; Xiucheng Sun; Xiaoyu Li; Jian Lin; Sen Lin; Xiaodong Wang; Tao Zhang

doi:10.1021/acscatal.0c02253

Identification of Active Sites on High-Performance Pt/Al₂O₃Catalyst for Cryogenic CO Oxidation

Yang Chen, Yingxin Feng, Lin Li, Jingyue Liu, Xiaoli Pan, Wei Liu, Fenfei Wei, Yitao Cui, Botao Qiao, Xiucheng Sun, Xiaoyu Li, Jian Lin, Sen Lin, Xiaodong Wang, Tao Zhang

Physics

Research output: Contribution to journal › Article › peer-review

54 Scopus citations

Abstract

Exclusive Pt species supported on inert substrates have not achieved satisfactory performance for cryogenic CO oxidation because of the constraint of the competitive Langmuir-Hinshelwood process in which the strongly adsorbed CO inhibits the activation of O2. Here, we develop a catalyst of Pt nanoparticles on Al2O3 that exhibits extremely high activity with 100% CO conversion at-20 °C and orders of magnitude higher specific rate than current commercial catalysts. Detailed catalyst characterizations reveal the presence of metallic Pt sites and positively charged ones associated with the OH species in Pt/Al2O3. Both experimental data and theoretical calculations suggest that CO adsorbed on Pt(OH) kink sites reacts with OH species covering Pt terrace sites to release CO2. Afterward, O2 is facilely activated on terrace sites to regenerate OH. The presence of OH species and the synergy between Pt kink and terrace sites on the Pt species lead to an ultralow reaction barrier for CO oxidation.

Original language	English (US)
Pages (from-to)	8815-8824
Number of pages	10
Journal	ACS Catalysis
Volume	10
Issue number	15
DOIs	https://doi.org/10.1021/acscatal.0c02253
State	Published - Aug 7 2020

Keywords

CO oxidation
active site
catalysis
cryogenic temperatures
platinum

ASJC Scopus subject areas

Catalysis
General Chemistry

Access to Document

10.1021/acscatal.0c02253

Cite this

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title = "Identification of Active Sites on High-Performance Pt/Al2O3Catalyst for Cryogenic CO Oxidation",

abstract = "Exclusive Pt species supported on inert substrates have not achieved satisfactory performance for cryogenic CO oxidation because of the constraint of the competitive Langmuir-Hinshelwood process in which the strongly adsorbed CO inhibits the activation of O2. Here, we develop a catalyst of Pt nanoparticles on Al2O3 that exhibits extremely high activity with 100% CO conversion at-20 °C and orders of magnitude higher specific rate than current commercial catalysts. Detailed catalyst characterizations reveal the presence of metallic Pt sites and positively charged ones associated with the OH species in Pt/Al2O3. Both experimental data and theoretical calculations suggest that CO adsorbed on Pt(OH) kink sites reacts with OH species covering Pt terrace sites to release CO2. Afterward, O2 is facilely activated on terrace sites to regenerate OH. The presence of OH species and the synergy between Pt kink and terrace sites on the Pt species lead to an ultralow reaction barrier for CO oxidation.",

keywords = "CO oxidation, active site, catalysis, cryogenic temperatures, platinum",

author = "Yang Chen and Yingxin Feng and Lin Li and Jingyue Liu and Xiaoli Pan and Wei Liu and Fenfei Wei and Yitao Cui and Botao Qiao and Xiucheng Sun and Xiaoyu Li and Jian Lin and Sen Lin and Xiaodong Wang and Tao Zhang",

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T1 - Identification of Active Sites on High-Performance Pt/Al2O3Catalyst for Cryogenic CO Oxidation

AU - Chen, Yang

AU - Feng, Yingxin

AU - Li, Lin

AU - Liu, Jingyue

AU - Pan, Xiaoli

AU - Liu, Wei

AU - Wei, Fenfei

AU - Cui, Yitao

AU - Qiao, Botao

AU - Sun, Xiucheng

AU - Li, Xiaoyu

AU - Lin, Jian

AU - Lin, Sen

AU - Wang, Xiaodong

AU - Zhang, Tao

PY - 2020/8/7

Y1 - 2020/8/7

N2 - Exclusive Pt species supported on inert substrates have not achieved satisfactory performance for cryogenic CO oxidation because of the constraint of the competitive Langmuir-Hinshelwood process in which the strongly adsorbed CO inhibits the activation of O2. Here, we develop a catalyst of Pt nanoparticles on Al2O3 that exhibits extremely high activity with 100% CO conversion at-20 °C and orders of magnitude higher specific rate than current commercial catalysts. Detailed catalyst characterizations reveal the presence of metallic Pt sites and positively charged ones associated with the OH species in Pt/Al2O3. Both experimental data and theoretical calculations suggest that CO adsorbed on Pt(OH) kink sites reacts with OH species covering Pt terrace sites to release CO2. Afterward, O2 is facilely activated on terrace sites to regenerate OH. The presence of OH species and the synergy between Pt kink and terrace sites on the Pt species lead to an ultralow reaction barrier for CO oxidation.

AB - Exclusive Pt species supported on inert substrates have not achieved satisfactory performance for cryogenic CO oxidation because of the constraint of the competitive Langmuir-Hinshelwood process in which the strongly adsorbed CO inhibits the activation of O2. Here, we develop a catalyst of Pt nanoparticles on Al2O3 that exhibits extremely high activity with 100% CO conversion at-20 °C and orders of magnitude higher specific rate than current commercial catalysts. Detailed catalyst characterizations reveal the presence of metallic Pt sites and positively charged ones associated with the OH species in Pt/Al2O3. Both experimental data and theoretical calculations suggest that CO adsorbed on Pt(OH) kink sites reacts with OH species covering Pt terrace sites to release CO2. Afterward, O2 is facilely activated on terrace sites to regenerate OH. The presence of OH species and the synergy between Pt kink and terrace sites on the Pt species lead to an ultralow reaction barrier for CO oxidation.

KW - CO oxidation

KW - active site

KW - catalysis

KW - cryogenic temperatures

KW - platinum

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