Catalytic oxidation of low concentration formaldehyde over Pt/TiO2 catalyst

doi:10.1016/j.cjche.2020.04.024

中国化学工程学报 ›› 2021, Vol. 29 ›› Issue (1): 190-195.DOI: 10.1016/j.cjche.2020.04.024

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst

Yuan Su^1,2, Keming Ji¹, Jiayao Xun¹, Kan Zhang¹, Ping Liu¹, Liang Zhao²

1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

收稿日期:2020-02-13 修回日期:2020-04-12 出版日期:2021-01-28 发布日期:2021-04-02
通讯作者: Keming Ji, Ping Liu, Liang Zhao
基金资助:
This work was supported by the CAS (Chinese Academy of Sciences) Strategic Priority Research Program (XDA-21020500).

Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst

Yuan Su^1,2, Keming Ji¹, Jiayao Xun¹, Kan Zhang¹, Ping Liu¹, Liang Zhao²

1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Received:2020-02-13 Revised:2020-04-12 Online:2021-01-28 Published:2021-04-02
Contact: Keming Ji, Ping Liu, Liang Zhao
Supported by:
This work was supported by the CAS (Chinese Academy of Sciences) Strategic Priority Research Program (XDA-21020500).

摘要/Abstract

摘要： Formaldehyde (HCHO) is an important indoor pollutant. Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution. In this study, a series of Pt/TiO₂ catalysts are prepared by impregnation and reduced by NaBH₄. The effects of loading amount of Pt and crystal type of TiO₂ on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are investigated. The results show that the quantity of active site and the oxygen vacancy of catalysts increased with increasing Pt content, which is beneficial to promote the further performance of catalysts. Nevertheless, with the further rises of Pt content, the specific surface area further decreases, and the proportion of Pt²⁺ species on the catalyst surface which is significant to catalytic properties also decreases, causing catalytic performance decreases. Compared with the catalyst supporting on rutile, the Pt/a-TiO₂ catalyst supporting on anatase has larger specific surface area, more Pt²⁺ phase and easier to form oxygen vacancy in the support, which cause better catalytic performance. The catalyst with Pt content of 0.1 wt% and supported by anatase TiO₂ has the best catalytic performance. The HCHO conversion efficiency reaches 98% and 100% at 50 ℃ and 100 ℃, and the stabilization time is longer than 140 h.

关键词: Catalyst support, Catalysis, Fixed-bed, Pt/TiO₂

Abstract: Formaldehyde (HCHO) is an important indoor pollutant. Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution. In this study, a series of Pt/TiO₂ catalysts are prepared by impregnation and reduced by NaBH₄. The effects of loading amount of Pt and crystal type of TiO₂ on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are investigated. The results show that the quantity of active site and the oxygen vacancy of catalysts increased with increasing Pt content, which is beneficial to promote the further performance of catalysts. Nevertheless, with the further rises of Pt content, the specific surface area further decreases, and the proportion of Pt²⁺ species on the catalyst surface which is significant to catalytic properties also decreases, causing catalytic performance decreases. Compared with the catalyst supporting on rutile, the Pt/a-TiO₂ catalyst supporting on anatase has larger specific surface area, more Pt²⁺ phase and easier to form oxygen vacancy in the support, which cause better catalytic performance. The catalyst with Pt content of 0.1 wt% and supported by anatase TiO₂ has the best catalytic performance. The HCHO conversion efficiency reaches 98% and 100% at 50 ℃ and 100 ℃, and the stabilization time is longer than 140 h.

Key words: Catalyst support, Catalysis, Fixed-bed, Pt/TiO₂

Yuan Su, Keming Ji, Jiayao Xun, Kan Zhang, Ping Liu, Liang Zhao. Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst[J]. 中国化学工程学报, 2021, 29(1): 190-195.

Yuan Su, Keming Ji, Jiayao Xun, Kan Zhang, Ping Liu, Liang Zhao. Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst[J]. Chinese Journal of Chemical Engineering, 2021, 29(1): 190-195.

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Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst

Catalytic oxidation of low concentration formaldehyde over Pt/TiO₂ catalyst

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