Oxygen vacancy regulated valence states of Pt on rutile TiO2 promote catalytic oxidation of HCHO

Yuanbo Song; Haocheng Wu; Yidan Liu; Guoli Chen; Rongrong Jia; Liyi Shi; Zheng Shen; Guanna Li; Johannes H. Bitter; Xiang Wang; Lei Huang

doi:10.1016/j.apcata.2023.119186

Oxygen vacancy regulated valence states of Pt on rutile TiO₂ promote catalytic oxidation of HCHO

Yuanbo Song, Haocheng Wu, Yidan Liu, Guoli Chen, Rongrong Jia, Liyi Shi, Zheng Shen, Guanna Li^*, Johannes H. Bitter, Xiang Wang^*, Lei Huang

^*Corresponding author for this work

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

Abstract

Anatase-TiO₂-supported Pt (Pt/TiO₂(A)) is a well-known supported catalyst for catalyzing the oxidation of formaldehyde (HCHO). However, rutile TiO₂ (TiO₂(R)) has not been widely utilized for this reaction due to its inferior performance. In this study, we have developed a novel approach involving NaBH₄-induced oxygen vacancy manipulation to regulate the valence states of Pt on TiO₂(R). By employing a large excess of NaBH₄ (n_NaBH4/n_Pt = 2000), we were able to generate an extraordinary concentration of oxygen defects and electron-rich sites on the surface of TiO₂(R), resulting in the concentration of Pt⁰ on Pt/TiO₂(R)− 2000 exceeding that on Pt/TiO₂(A)− 2000. The newly synthesized Pt/TiO₂(R)− 2000 catalyst exhibited a remarkably high turnover frequency (TOF) of 160.2 h⁻¹, which is approximately five times that of Pt/TiO₂(R)− 20. The discrepancy in the reaction mechanisms between rutile and anatase was identified as the critical factor underlying the vastly different performances observed.

Original language	English
Article number	119186
Number of pages	12
Journal	Applied Catalysis A: General
Volume	660
DOIs	https://doi.org/10.1016/j.apcata.2023.119186
Publication status	Published - 25 Jun 2023

Keywords

Catalytic oxidation
Metal-support interaction
Oxygen vacancy
Rutile
TiO

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Cite this

@article{37ddd71fec03400db6d20966b43ea67a,

title = "Oxygen vacancy regulated valence states of Pt on rutile TiO2 promote catalytic oxidation of HCHO",

abstract = "Anatase-TiO2-supported Pt (Pt/TiO2(A)) is a well-known supported catalyst for catalyzing the oxidation of formaldehyde (HCHO). However, rutile TiO2 (TiO2(R)) has not been widely utilized for this reaction due to its inferior performance. In this study, we have developed a novel approach involving NaBH4-induced oxygen vacancy manipulation to regulate the valence states of Pt on TiO2(R). By employing a large excess of NaBH4 (nNaBH4/nPt = 2000), we were able to generate an extraordinary concentration of oxygen defects and electron-rich sites on the surface of TiO2(R), resulting in the concentration of Pt0 on Pt/TiO2(R)− 2000 exceeding that on Pt/TiO2(A)− 2000. The newly synthesized Pt/TiO2(R)− 2000 catalyst exhibited a remarkably high turnover frequency (TOF) of 160.2 h−1, which is approximately five times that of Pt/TiO2(R)− 20. The discrepancy in the reaction mechanisms between rutile and anatase was identified as the critical factor underlying the vastly different performances observed.",

keywords = "Catalytic oxidation, Metal-support interaction, Oxygen vacancy, Rutile, TiO",

author = "Yuanbo Song and Haocheng Wu and Yidan Liu and Guoli Chen and Rongrong Jia and Liyi Shi and Zheng Shen and Guanna Li and Bitter, {Johannes H.} and Xiang Wang and Lei Huang",

year = "2023",

month = jun,

day = "25",

doi = "10.1016/j.apcata.2023.119186",

language = "English",

volume = "660",

journal = "Applied Catalysis A-General",

issn = "0926-860X",

publisher = "Elsevier",

}

TY - JOUR

T1 - Oxygen vacancy regulated valence states of Pt on rutile TiO2 promote catalytic oxidation of HCHO

AU - Song, Yuanbo

AU - Wu, Haocheng

AU - Liu, Yidan

AU - Chen, Guoli

AU - Jia, Rongrong

AU - Shi, Liyi

AU - Shen, Zheng

AU - Li, Guanna

AU - Bitter, Johannes H.

AU - Wang, Xiang

AU - Huang, Lei

PY - 2023/6/25

Y1 - 2023/6/25

N2 - Anatase-TiO2-supported Pt (Pt/TiO2(A)) is a well-known supported catalyst for catalyzing the oxidation of formaldehyde (HCHO). However, rutile TiO2 (TiO2(R)) has not been widely utilized for this reaction due to its inferior performance. In this study, we have developed a novel approach involving NaBH4-induced oxygen vacancy manipulation to regulate the valence states of Pt on TiO2(R). By employing a large excess of NaBH4 (nNaBH4/nPt = 2000), we were able to generate an extraordinary concentration of oxygen defects and electron-rich sites on the surface of TiO2(R), resulting in the concentration of Pt0 on Pt/TiO2(R)− 2000 exceeding that on Pt/TiO2(A)− 2000. The newly synthesized Pt/TiO2(R)− 2000 catalyst exhibited a remarkably high turnover frequency (TOF) of 160.2 h−1, which is approximately five times that of Pt/TiO2(R)− 20. The discrepancy in the reaction mechanisms between rutile and anatase was identified as the critical factor underlying the vastly different performances observed.

AB - Anatase-TiO2-supported Pt (Pt/TiO2(A)) is a well-known supported catalyst for catalyzing the oxidation of formaldehyde (HCHO). However, rutile TiO2 (TiO2(R)) has not been widely utilized for this reaction due to its inferior performance. In this study, we have developed a novel approach involving NaBH4-induced oxygen vacancy manipulation to regulate the valence states of Pt on TiO2(R). By employing a large excess of NaBH4 (nNaBH4/nPt = 2000), we were able to generate an extraordinary concentration of oxygen defects and electron-rich sites on the surface of TiO2(R), resulting in the concentration of Pt0 on Pt/TiO2(R)− 2000 exceeding that on Pt/TiO2(A)− 2000. The newly synthesized Pt/TiO2(R)− 2000 catalyst exhibited a remarkably high turnover frequency (TOF) of 160.2 h−1, which is approximately five times that of Pt/TiO2(R)− 20. The discrepancy in the reaction mechanisms between rutile and anatase was identified as the critical factor underlying the vastly different performances observed.

KW - Catalytic oxidation

KW - Metal-support interaction

KW - Oxygen vacancy

KW - Rutile

KW - TiO

U2 - 10.1016/j.apcata.2023.119186

DO - 10.1016/j.apcata.2023.119186

M3 - Article

AN - SCOPUS:85152658582

SN - 0926-860X

VL - 660

JO - Applied Catalysis A-General

JF - Applied Catalysis A-General

M1 - 119186