低碳化学与化工2025，Vol.50Issue(12)：87-94,128,9.DOI:10.12434/j.issn.2097-2547.20250098
甲醛生产尾气催化燃烧中催化剂特性及其工业应用研究
Study on characteristics and industrial application of catalysts in catalytic combustion of formaldehyde production tail gas
摘要
Abstract
Tail gas from Fe-Mo methanol-to-formaldehyde production contains multiple pollutants such as carbon monoxide(CO),formaldehyde(CH2O),methanol(CH3OH)and dimethyl ether(DME),which are difficult to remove collaboratively.Based on the characteristics of different industrial catalytic combustion catalysts,a combination loading strategy was adopted to enhance the synergistic purification efficiency of complex pollutants.The physical properties of two industrial catalysts,Cat 1#and Cat 2#,were analyzed using XRD,N2 adsorption/desorption and TEM.Combined with laboratory activity evaluation results and the operation of the industrial emission control system(ECS),the structure-activity relationships of the catalysts were clarified,and their industrial application performance was elucidated.The results show that Cat 1#has a larger specific surface area,which promotes precious metal dispersion and reduces the light-off temperature of CO,and Cat 2#has a larger average pore size,which decreases the diffusion resistance of DME and improves its conversion rate.The combination loading strategy integrates the advantages of both catalysts.Laboratory evaluation results show that the reaction start to light off at a set temperature of 150℃(bed temperature 135.4℃).After light-off,the heat released by CO catalytic combustion increases the bed temperature from 100℃to 110℃,and the DME conversion rate exceeds 90%.In industrial operation,at the initial inlet temperature of 170℃,the outlet formaldehyde mass concentration is 1.1 mg/m3 and the total non-methane hydrocarbons mass concentration is 1.7 mg/m3.At the end of operation,when the inlet temperature is increased to 183℃,the outlet formaldehyde mass concentration reaches 4.2 mg/m3 and the total non-methane hydrocarbons mass concentration is 9.8 mg/m3,still meeting the emission standards.The combination loading strategy provides a new approach for catalytic purification of complex waste gas,and its industrial application data offers important reference value for engineering scale-up.关键词
甲醛生产尾气/贵金属催化剂/多污染物/催化燃烧Key words
formaldehyde production tail gas/precious metal catalyst/multiple pollutants/catalytic combustion分类
化学化工引用本文复制引用
陆辉,乔莎,张俊,陈艺之,胡志彪,张明胜,苏敏..甲醛生产尾气催化燃烧中催化剂特性及其工业应用研究[J].低碳化学与化工,2025,50(12):87-94,128,9.基金项目
四川省重大科技专项(2023ZDZX0005). （2023ZDZX0005）
