煤炭转化2025，Vol.48Issue(5)：70-79,10.DOI:10.19726/j.cnki.ebcc.202505007
煤和生物质高温共热解中Al2O3结构性质对吸附碱金属及催化焦油裂解性能的影响
Effect of Al2O3 in coal and biomass co-pyrolysis for adsorption of alkali metals and catalytic cracking of tar
摘要
Abstract
Co-gasification of coal and biomass is an important way to realize their clean and efficient utilization.Alkali metals are known to exhibit good catalytic activity for tar cracking.Captur-ing volatile alkali metals and utilizing them to catalyze tar cracking or reforming could simultaneously address the issues caused by alkali metals and tar volatilization.In this study,Al2O3 with varying mor-phologies and structural properties was selected as a trapping agent for volatile alkali metals and a cata-lyst for tar conversion in the co-gasification process of coal and biomass.The effects of different Al2O3 morphologies on alkali metal adsorption and simultaneous catalytic tar pyrolysis at high temperature(800℃-1 000℃)were investigated via a Py-GC/MS system combined with various characterization methods.The results show that the addition of Al2O3 effectively reduces tar content,with needle-shaped spherical Al2O3 demonstrating superior catalytic tar cracking performance,reducing tar content by about 55%compared to conditions without Al2O3.The ability of needle-shaped spherical Al2O3 to adsorb alkali metals is stronger than that of commercial γ-Al2O3(H+),likely due to its larger specific surface area and unique morphology.Compared to Al2O3 without adsorbed alkali metal,Al2O3 with a small amount of adsorbed alkali metal has a less pronounced effect on overall tar cracking but pro-moted the enrichment of ketones and phenols.Physically adsorbed alkali metals reduce the acidic sites of Al2O3,thereby inhibiting direct tar cracking.This study provides important guidance for addressing tar and alkali metal corrosion issues in the process of coal and biomass co-gasification.关键词
煤和生物质/共热解/Al2O3/碱金属/焦油/催化Key words
coal and biomass/co-pyrolysis/Al2O3/alkali metals/tar/catalysis分类
化学化工引用本文复制引用
何钰,王焦飞,张玉洁,宋旭东,苏暐光,白永辉,吕鹏,于广锁..煤和生物质高温共热解中Al2O3结构性质对吸附碱金属及催化焦油裂解性能的影响[J].煤炭转化,2025,48(5):70-79,10.基金项目
国家自然科学基金项目(22008126). （22008126）
