Dr. Iswary Letchumanan, Dr. Ajaz Ahmad Wani, Dr. Norazuwana Shaari, Dr. Mahnoush Beygisangchin, Prof. Siti Kartom Kamarudin, Dr. Nabila A. Karim
The innovation of high-performance, stable electrocatalysts for clean energy systems faces significant challenges. Metal-organic frameworks (MOFs), with their porous nature, flexible structures, and homogeneous active site dispersion, have gained interest as unique precursors for carbon-based catalysts. MOFs' properties significantly enhance catalytic performance in fuel cells. This review highlights recent advancements in MOF design for oxygen electrocatalysis in fuel cells, while also discussing perspectives for future material innovations to improve catalytic activity in this emerging field.
{"title":"Metal–Organic Frameworks as a Catalyst and Catalyst Support in Fuel Cells: From Challenges to Catalytic Application","authors":"Dr. Iswary Letchumanan, Dr. Ajaz Ahmad Wani, Dr. Norazuwana Shaari, Dr. Mahnoush Beygisangchin, Prof. Siti Kartom Kamarudin, Dr. Nabila A. Karim","doi":"10.1002/ceat.202300580","DOIUrl":"10.1002/ceat.202300580","url":null,"abstract":"<p>The innovation of high-performance, stable electrocatalysts for clean energy systems faces significant challenges. Metal-organic frameworks (MOFs), with their porous nature, flexible structures, and homogeneous active site dispersion, have gained interest as unique precursors for carbon-based catalysts. MOFs' properties significantly enhance catalytic performance in fuel cells. This review highlights recent advancements in MOF design for oxygen electrocatalysis in fuel cells, while also discussing perspectives for future material innovations to improve catalytic activity in this emerging field.</p>","PeriodicalId":10083,"journal":{"name":"Chemical Engineering & Technology","volume":"47 11","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hydrogen liquefaction is essential for the efficient storage and transportation of hydrogen. In the liquefaction process, catalytic ortho-para conversion is crucial to achieve a product with at least 95 % para-hydrogen to reduce boil-off losses. The proposed hydrogen liquefaction process using a catalyst-filled heat exchanger for continuous ortho-para conversion is modeled through steady-state thermal simulations in Aspen HYSYS. Additionally, an ejector is integrated to reliquefy boil-off gas. The proposed design achieves a specific energy consumption (SEC) of 10.50 kWh ()−1 and an exergy efficiency (EXE) of 30.1 %, which is 18 % lower in SEC compared to processes with separate converters. The integrated approach enhances energy utilization and offers references for future hydrogen liquefiers.
{"title":"Energy-Efficient Hydrogen Liquefaction Process with Ortho-Para Conversion and Boil-Off Gas Recovery","authors":"Prof. Jian Wen, Haolin Xie, Xin Zhao, Ke Li","doi":"10.1002/ceat.202400150","DOIUrl":"10.1002/ceat.202400150","url":null,"abstract":"<p>Hydrogen liquefaction is essential for the efficient storage and transportation of hydrogen. In the liquefaction process, catalytic ortho-para conversion is crucial to achieve a product with at least 95 % para-hydrogen to reduce boil-off losses. The proposed hydrogen liquefaction process using a catalyst-filled heat exchanger for continuous ortho-para conversion is modeled through steady-state thermal simulations in Aspen HYSYS. Additionally, an ejector is integrated to reliquefy boil-off gas. The proposed design achieves a specific energy consumption (SEC) of 10.50 kWh (<span></span><math></math>)<sup>−1</sup> and an exergy efficiency (EXE) of 30.1 %, which is 18 % lower in SEC compared to processes with separate converters. The integrated approach enhances energy utilization and offers references for future hydrogen liquefiers.</p>","PeriodicalId":10083,"journal":{"name":"Chemical Engineering & Technology","volume":"47 10","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}