Synergistic effect of Pd/CZO catalysts and an electric field on complete combustion of lean and humid methane at low temperatures

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-04 DOI:10.1039/d4cy00699b

Kei Sugiura, Takuma Higo, Nobuki Matsumoto, Harunobu Tedzuka, Yasushi Sekine

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Abstract

The elimination of unburned methane produced by internal combustion engines is extremely important because of the strong greenhouse effect of methane. Difficulties in controlling unburned methane arise from its characteristics, such as its difficulty of adsorption, low exhaust gas temperatures in an efficient engine, low concentrations of unburned emitted methane, and the coexistence of steam and residual oxygen as coexisting substances in the exit gas. Results of the present study demonstrate that the removal activity of methane by complete combustion was improved dramatically at low temperatures by the application of a DC electric field to the Pd/Ce_xZr_1−xO₂ catalyst system, even under a humid atmosphere. Specifically, 1 wt% Pd/Ce_0.25Zr_0.75O₂ showed very higher methane conversion under humid conditions than under dry conditions at 473 K in the presence of an electric field. To elucidate the reaction mechanisms involved in this process of steam adsorption, we conducted partial pressure dependence tests and activity tests with steam under an electric field.

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Pd/CZO 催化剂和电场对低温下完全燃烧贫湿甲烷的协同效应

由于甲烷具有强烈的温室效应，因此消除内燃机产生的未燃烧甲烷极为重要。控制未燃烧甲烷的困难在于其特性，例如难以吸附、高效发动机的排气温度低、未燃烧排放甲烷的浓度低，以及排出气体中蒸汽和残余氧气作为共存物质。本研究的结果表明，通过对 Pd/CexZr1-xO2 催化剂系统施加直流电场，即使在潮湿的环境下，完全燃烧去除甲烷的活性在低温条件下也得到了显著提高。具体来说，在电场作用下，1 wt% Pd/Ce0.25Zr0.75O2 在潮湿条件下的甲烷转化率比在 473 K 下的干燥条件下高得多。为了阐明蒸汽吸附过程中的反应机制，我们进行了分压依赖性测试和电场下蒸汽活性测试。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.