甘油选择性氧化成甘醇酸和草酸,用于直接甘油燃料电池

IF 2.6 4区 工程技术 Q3 ELECTROCHEMISTRY
Fuel Cells Pub Date : 2024-08-08 DOI:10.1002/fuce.202300238
P. Othman, N. Karim, Febdian Rusydi
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引用次数: 0

摘要

直接甘油燃料电池(DGFC)是一种前景广阔的应用,但催化剂存在局限性,有待改进。本研究利用密度泛函理论(DFT)计算来阐明在钯(Pd)催化剂中添加银(Ag)如何改变甘油氧化反应(GEOR)的机理。研究发现,甘油在反应开始时很容易在主碳上氧化。使用 Pd3-Ag1 (111) 时,甘油醛和甘油酸作为中间产物产生于一级碳氧化。在反应过程中,添加 Ag 有助于 C-C 裂解,将甘油酸转化为乙醇酸而不是酒石酸。由于早期的 C-C 分裂,乙醇酸和草酸等高价值分子的选择性更有可能增加。在可能的化学途径的末端,可以利用可转移的 9 个电子生成草酸或甲酸。这项研究的催化剂模型和机理可与新的合金催化剂组合和改性一起使用,也可使用不同类型的酒精或多元醇作为燃料进行测试。通过对机理进行 DFT 分析,可以更灵活地改进和设计新型催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Selective Oxidation of Glycerol to Glycolic and Oxalic Acids for Direct Glycerol Fuel Cell
The direct glycerol fuel cell (DGFC) is a promising application, although the catalyst has limits and could be improved. This study used density functional theory (DFT) calculations to elucidate how the addition of silver (Ag) to a palladium (Pd) catalyst can change the mechanism of the glycerol oxidation reaction (GEOR). It was discovered that the glycerol easily oxidized at the primary carbon at the start of the reaction. Glyceraldehyde and glyceric acid are produced as intermediary products due to primary carbon oxidation using Pd3–Ag1 (111). The addition of Ag aided C–C cleavage during the reaction, converting glyceric acid to glycolic acid rather than tartronic acid. The selectivity of high‐value molecules such as glycolic and oxalic acid was more likely to increase due to the early C–C splitting. At the end of the possible chemical pathways, oxalic acid or formic acid can be generated with the nine electrons that can be transferred. This work's catalyst model and mechanism can be employed with a new alloy catalyst combination and modification or tested with a different type of alcohol or polyol as fuel. DFT analysis of the mechanism allows for more flexible improvement and design in the search for novel and better catalysts.
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来源期刊
Fuel Cells
Fuel Cells 工程技术-电化学
CiteScore
5.80
自引率
3.60%
发文量
31
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.
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