功能陶瓷基限域型负载贵金属催化剂的制备与高温催化性能研究

Preparation and High-Temperature Catalytic Performance of Functional Ceramic-Based Confined Supported Noble Metal Catalysts

摘要

负载型贵金属催化剂在高温催化反应中会出现金属纳米颗粒烧结、团聚导致活性衰减问题，本文以功能陶瓷为载体系统性研究限域型负载贵金属催化剂的制备方法、结构调控及其高温催化性能。通过孔道封装、核壳包覆和纳米岛锚定等方式将贵金属纳米颗粒稳定于陶瓷载体的限域空间内，有效抑制其高温下的迁移与团聚。重点探讨了功能陶瓷的孔结构调控、贵金属的负载方式以及限域结构对催化剂高温稳定性的影响机制。研究结果表明，限域效应通过空间约束和电子结构调控双重作用，显著提升了催化剂在高温氧化反应中的活性和稳定性，为高稳定性工业催化剂的开发提供了新思路。

Abstract

In the high temperature catalytic reaction, the supported noble metal catalyst will have the problem of sintering and agglomeration of metal nanoparticles, which leads to the attenuation of activity. In this paper, the preparation method, structure control and high temperature catalytic performance of the confined supported noble metal catalyst were systematically studied with functional ceramics as the carrier. The noble metal nanoparticles are stabilized in the confined space of the ceramic carrier by means of pore encapsulation, core-shell coating and nano-island anchoring, which effectively inhibits their migration and agglomeration at high temperature. The effects of pore structure regulation of functional ceramics, loading methods of noble metals and confined structure on the high temperature stability of catalysts were discussed. The results show that the confinement effect significantly improves the activity and stability of the catalyst in the high-temperature oxidation reaction through the dual effects of spatial constraints and electronic structure regulation, which provides a new idea for the development of high-stability industrial catalysts.

关键词

负载型贵金属催化剂 / 热稳定性 / 限域效应 / 功能陶瓷 / 抗烧结

Key words

supported noble metal catalyst / thermal stability / confinement effect / functional ceramics / resistance to sintering

参考文献

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