煤中方解石调控的活性炭结构对Mn-Ce/AC催化剂NH3-SCR性能的强化机制OA
Mechanism of enhancing NH3-SCR performance of Mn-Ce/AC catalyst by the structure regulation of activated carbon with calcite in coal
为了探究煤中方解石调控的活性炭结构对SCR催化剂低温脱硝性能的影响,本研究采用酸洗的方法脱除了活性炭中的含钙矿物质,采用等体积浸渍的方法制备得到Mn-Ce/De-AC-xCaCO3(x为煤中方解石的含量)催化剂.通过系列表征及低温脱硝活性测试明确了煤中方解石调控的活性炭结构对SCR催化剂脱硝性能的影响.结果表明,煤中方解石调控的活性炭结构强化了 SCR催化剂的脱硝性能.当温度为210 ℃时,SCR催化剂的脱硝率由Mn-Ce/De-AC的88.3％提高至Mn-Ce/De-AC-1CaCO3的91.7％.煤中方解石调控的活性炭结构使SCR催化剂的理化性能得到改善,具有更高的Mn4+和Ce4+/Ce3+含量、更高的化学吸附氧和丰富的酸性位点,进而在脱硝反应中强化了 SCR反应路径(丰富的NH3活化物质和双齿硝酸盐活性物质等),低温脱硝活性提高.
To elucidate the effect of calcite-regulated activated carbon(AC)structure on low-temperature denitrification performance of SCR catalysts,this work prepared a series of Mn-Ce/De-AC-xCaCO3(x is the calcite content in coal)catalysts were prepared by the incipient wetness impregnation method,followed by acid washing to remove calcium-containing minerals.Comprehensive characterization and low-temperature denitrification tests revealed that calcite-induced structural modulation of coal-derived AC significantly enhances catalytic activity.Specifically,NO conversion increased from 88.3％of Mn-Ce/De-AC to 91.7％of Mn-Ce/De-AC-1CaCO3(210 ℃).The improved SCR denitrification activity results from the enhancement of physicochemical properties including higher Mn4+content and Ce4+/Ce3+ratio,an abundance of chemisorbed oxygen and acidic sites,which could strengthen the SCR reaction pathways(richer NH3 activated species and bidentate nitrate active species).Therefore,NO removal is enhanced.
牛健;李宇航;白宝峰;文朝璐;李林波;张慧荣;郭少青
太原科技大学环境与资源学院,山西太原 030024山西大学资源与环境工程研究所国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西太原 030006山西省交通环境保护中心站(有限公司),山西太原 030032山西大学资源与环境工程研究所国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西太原 030006西安建筑科技大学冶金工程学院,陕西西安,710055山西大学资源与环境工程研究所国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西太原 030006太原科技大学环境与资源学院,山西太原 030024
化学化工
方解石活性炭结构Mn-Ce/AC催化剂NH3-SCR性能
calciteactivated carbonstructureMn-Ce/AC catalystNH3-SCR performance
《燃料化学学报（中英文）》 2026 (1)
78-88,11
Supported by the Science and Technology Cooperation and Exchange special project of Cooperation of Shanxi Province(202404041101014),the Fundamental Research Program of Shanxi Province(202403021212333),the Joint Funds of the National Natural Science Foundation of China(U24A20555),the Lvliang Key R&D of University-Local Cooperation(2023XDHZ10),the Initiation Fund for Doctoral Research of Taiyuan University of Science and Technology(20242026),and the Outstanding Doctor Funding Award of Shanxi Province(20242080).
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