老化气氛对负载Rh催化剂三元催化性能的影响

IF 0.6 4区工程技术 Q4 ENERGY & FUELS

Journal of The Japan Petroleum Institute Pub Date : 2021-09-01 DOI:10.1627/JPI.64.219

Yasutaka Tomida, M. Haneda

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引用次数: 0

摘要

在贫/富摄动条件下，对Rh/ al2o3和CZ混合物的高温时效失活进行了清晰的观察。转化率达到50%时的起燃温度依次升高。≈rich < rich/lean < lean老化条件。CO吸附后的原位FT-IR光谱显示，Rh的分散和分离的Rh位点的存在是高发光活性的原因。贫/富摄动条件下高温区NO转化受大气老化影响。H 2 -TPR测量表明，在高温老化过程中，根据不同的大气形成了不同强度的Rh - CZ相互作用。Rh - CZ相互作用的强度被认为是在高温区域实现高NO转化率的重要因素。

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Effect of Ageing Atmosphere on Three-way Catalytic Performance of Supported Rh Catalysts

Deactivation of a mixture of Rh/Al 2 O 3 and CeO 2 _ ZrO 2 (CZ) by high-temperature ageing was clearly observed in three-way catalytic reactions under lean/rich perturbation conditions. The light-off temperature at which 50 % conversion was achieved was increased in the order of fresh ＜ stoichi. ≈ rich ＜ rich/lean ＜ lean ageing conditions. Rh dispersion and presence of isolated Rh sites, revealed from in-situ FT-IR spectroscopy following CO adsorption, were responsible for the high light-off activity. NO conversion in higher temperature regions under lean/rich perturbation conditions was inﬂuenced by the ageing atmosphere. H 2 -TPR measurements suggested the formation of Rh _ CZ interactions with different strengths depending on the atmosphere during high-tempera-ture ageing. The strength of the Rh _ CZ interaction was suspected to be important to achieve high NO conversion in higher temperature regions.

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来源期刊

Journal of The Japan Petroleum Institute 工程技术-工程：石油

CiteScore

1.70

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： “Journal of the Japan Petroleum Institute”publishes articles on petroleum exploration, petroleum refining, petrochemicals and relevant subjects (such as natural gas, coal and so on). Papers published in this journal are also put out as the electronic journal editions on the web. Topics may range from fundamentals to applications. The latter may deal with a variety of subjects, such as: case studies in the development of oil fields, design and operational data of industrial processes, performances of commercial products and others