Pt-TiO_(2)纳米管阵列电催化氮气合成氨  

Electrocatalytic Nitrogen Synthesis of Ammonia by Pt-TiO_(2) Nanotube Arrays

作　　者：魏国松 王梅姣 李人杰 于梦 彭彦华 Wei Guosong;Wang Meijiao;Li Renjie;Yu Meng;Peng Yanhua(School of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,China)

机构地区：[1]青岛大学化学化工学院,山东青岛266071

出　　处：《山东化工》2024年第9期58-63,共6页Shandong Chemical Industry

摘　　要：氨(NH_(3))是重要的基础化工原料。工业上氨的合成主要采用Haber-Bosch工艺,该工艺往往需要在高温高压下进行,这不仅消耗大量的燃料,每年还会产生约4.5亿t的二氧化碳,给能源和环境带来巨大的压力。电催化氮气还原合成氨因其能耗低和反应条件温和等优势成为实现“双碳目标”的可替代方案。然而,电催化固氮受到选择性差、法拉第效率低和NH_(3)产率低等问题的限制,这使其性能远远不能满足工业化的需求。因此开发具有高效电催化氮气还原合成氨催化剂是必要的且富有挑战性的。本工作采用一次阳极氧化法合成了TiO_(2)纳米管阵列,并通过光还原法在TiO_(2)表面上沉积Pt作为助催化剂来电催化氮气还原合成氨,研究结果表明Pt负载TiO_(2)纳米管阵列具有优良的电催化固氮性能,最优Pt-TiO_(2)催化剂在-0.4 V(vs RHE)下实现了48.8μg·h^(-1)·mg_(cat)^(-1)的NH_(3)产率,这为优良电催化固氮合成氨催化剂的设计提供了重要的指导。Ammonia(NH_(3))is an indispensable chemical in modern society.Industrial ammonia synthesis is largely controlled by the Haber Bosch process,which produces around 450 million tonnes of CO_(2) per year,which is incompatible with achieving"carbon peaking"and"carbon neutrality".Electrochemical nitrogen reduction to ammonia synthesis is a good alternative because of its low energy consumption and mild reaction conditions.However,electrocatalytic nitrogen fixation always has the problems of poor selectivity,low Faraday efficiency and low NH_(3) yield,which makes the performance of the catalyst far from meeting the needs of industrialization.Therefore,it is necessary and challenging to develop catalysts with high efficiency for electrochemical nitrogen reduction of synthetic ammonia.TiO_(2) nanotube arrays were synthesized by a simple anodizing method,and Pt was photodeposited on TiO_(2) as electrocatalyst to synthesize NH_(3).The final results showed that high NH_(3) yield was achieved.The optimal Pt-TiO_(2) catalyst achieved NH_(3) yield of 48.8μg·h^(-1)·mg_(cat)^(-1) at-0.4 V(vs RHE).

关 键 词：电催化固氮 TiO_(2)纳米管 电化学合成氨 光沉积 

分 类 号：TQ113.2[化学工程—无机化工]