Low-temperature preferential CO oxidation in a hydrogen-rich stream over Pt-NaY and modified Pt-NaY catalysts for fuel cell application

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2023-01-10 DOI:10.1002/fuce.202200134

Sachin Malwadkar, Parthasarathi Bera, Chilukuri V. V. Satyanarayana

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引用次数: 0

Abstract

Preferential oxidation of CO (CO-PROX) in the hydrogen-rich stream has been carried out over Pt-NaY catalysts containing various Pt loadings along with Fe, Co, and Au. Catalysts have been characterized with inductively coupled plasma-atomic emission spectroscopy, Brunauer, Emmett, and Teller surface area, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature programmed reduction, and Pt dispersion. CO-PROX activities and CO oxidation selectivities are observed to increase with an increase in Pt content. Pt-NaY catalyst with 0.75 wt.% Pt loading shows maximum CO-PROX activity at low temperatures. An increase in space velocity decreases the CO and O₂ conversions, but CO oxidation selectivity increases. A decrease in activity is observed when reformat gas contains around 20% H₂O. During the stability test, no change in CO and O₂ conversions is observed, but a small increase in the CO oxidation selectivity is noticed after 10 h indicating that the Pt-NaY catalyst is a promising candidate for CO-PROX reaction in a hydrogen-rich stream. The Pt-Fe-NaY catalyst shows better activity than the Pt-NaY catalyst but starts deactivating after 10 h. However, activity is observed to decrease over Pt-Co-NaY and Pt-Au-NaY catalysts. Pt-Fe-NaY catalyst with 0.75 and 0.35 wt.% Pt and Fe, respectively, shows better CO-PROX activity at a temperature of 75°C.

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富氢流中CO的低温优先氧化优于Pt - NaY和改性Pt - NaY催化剂的燃料电池应用

在富氢流中CO (CO - PROX)的优先氧化已经在含有不同Pt负载以及Fe, CO和Au的Pt - NaY催化剂上进行。用电感耦合等离子体原子发射光谱、Brunauer、Emmett和Teller表面积、X射线衍射、透射电子显微镜、X射线光电子能谱、程序升温还原和Pt色散对催化剂进行了表征。CO - PROX活性和CO氧化选择性随Pt含量的增加而增加。Pt - NaY催化剂在低温下表现出最大的CO - PROX活性，Pt负载为0.75 wt.%。空速的增加降低了CO和O2的转化率，但CO的氧化选择性增加。重整气体中H2O含量在20%左右时，活性下降。在稳定性测试中，CO和O2转化率没有变化，但10 h后CO氧化选择性有小幅增加，这表明Pt - NaY催化剂是富氢流中CO - PROX反应的有希望的候选者。Pt - Fe - NaY催化剂表现出比Pt - NaY催化剂更好的活性，但在10 h后开始失活。然而，与Pt - Co - NaY和Pt - Au - NaY催化剂相比，活性有所下降。Pt - Fe - NaY催化剂的Pt含量分别为0.75 wt.%和0.35 wt.%，在温度为75℃时表现出较好的CO - PROX活性。

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.