高温还原处理提高了用于 CO 和 C3H8 氧化的铂/六铝酸盐催化剂的热稳定性

IF 4.4 3区化学 Q2 CHEMISTRY, PHYSICAL Catalysis Science & Technology Pub Date : 2024-09-11 DOI:10.1039/d4cy00708e

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

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引用次数: 0

摘要

在苛刻的条件下提高支撑贵金属催化剂的热稳定性对现代化学工业来说仍然是一项挑战。本文合成了Fe-取代的六铝酸盐支撑铂催化剂（Pt/BaFeAl11O19），并在不同气氛下进行了800 ℃高温处理。铂颗粒在氧化气氛下出现严重烧结，但在还原条件下具有很高的稳定性。有趣的是，在高温下预还原的 Pt/BaFeAl11O19 在氧化退火过程中具有更好的抗烧结能力。表征结果表明，在 H2 气氛下很容易形成氧空位，从而有利于在铂纳米粒子上形成涂层。这种结构有助于在随后的氧化煅烧过程中保留氧空位，从而提高稳定性。铂颗粒的高热稳定性与 Pt/BaFeAl11O19 中易于生成的 Fe2+ 位点相结合，使其在 800 °C 循环水热老化后对 CO 和 C3H8 氧化具有优异的催化性能。

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

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.

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来源期刊

Catalysis Science & Technology CHEMISTRY, PHYSICAL-

CiteScore

8.70

自引率

6.00%

发文量

587

审稿时长

1.5 months

期刊介绍： A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis. Editor-in-chief: Bert Weckhuysen Impact factor: 5.0 Time to first decision (peer reviewed only): 31 days