High temperature reductive treatment promotes thermal stability of Pt/hexaaluminate catalysts for CO and C3H8 oxidation

Yumeng Xu; Rongzhou Chen; Hailian Tang; Lu Yan; Fei Huang; Ming Tian; Kaibao Wu; Yanliang Zhou; Jian Lin; Ying Zheng; Xiaodong Wang

doi:10.1039/D4CY00708E

High temperature reductive treatment promotes thermal stability of Pt/hexaaluminate catalysts for CO and C₃H₈ oxidation†

Yumeng Xu,^a Rongzhou Chen,^a Hailian Tang,

^b Lu Yan,^a Fei Huang,

*^a Ming Tian,^c Kaibao Wu,^a Yanliang Zhou,^d Jian Lin,

*^c Ying Zheng

^a and Xiaodong Wang

*^c

Author affiliations

* Corresponding authors

^a Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Provincial Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian, China
E-mail: feihuang@fjnu.edu.cn
Fax: +86 0591 83464353

^b School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China

^c CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
E-mail: jianlin@dicp.ac.cn, xdwang@dicp.ac.cn

^d National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, Fujian, China

Abstract

Promoting the thermal stability of supported noble metal catalysts under harsh conditions remains challenging for the modern chemistry industry. Herein, Fe-substituted hexaaluminate supported Pt catalysts (Pt/BaFeAl₁₁O₁₉) were synthesized and treated with high temperature at 800 °C under different atmospheres. The Pt particles showed severe sintering under an oxidative atmosphere but high stability under reductive conditions. Interestingly, Pt/BaFeAl₁₁O₁₉ pre-reduced at high temperature possessed improved anti-sintering ablility during oxidative annealing. The characterization results demonstrate that oxygen vacancies were facilely formed under an H₂ atmosphere to favor the formation of coating layers on Pt nanoparticles. This structure helps retain oxygen vacancies during subsequent oxidative calcination, contributing to promoted stability. The high thermal stability of Pt particles coupled with the easy generation of Fe²⁺ sites in Pt/BaFeAl₁₁O₁₉ resulted in excellent catalytic performance for CO and C₃H₈ oxidation after cycling hydrothermal aging at 800 °C.

Catalysis Science & Technology

High temperature reductive treatment promotes thermal stability of Pt/hexaaluminate catalysts for CO and C₃H₈ oxidation†

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High temperature reductive treatment promotes thermal stability of Pt/hexaaluminate catalysts for CO and C₃H₈ oxidation

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