Low-temperature NH_(3)-SCR performance of a novel Chlorella@Mn composite denitrification catalyst  

作　　者：Hengheng Liu Fengyu Gao Songjin Ko Ning Luo Xiaolong Tang Erhong Duan Honghong Yi Yuansong Zhou 

机构地区：[1]School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants,Beijing 100083,China [3]School of Environmental Science and Engineering,University of Science and Technology Hebei,Hebei 050018,China [4]Department of Chemistry,Pyongyang University of Architecture,Pyongyang,Democratic People’s Republic of Korea

出　　处：《Journal of Environmental Sciences》2024年第3期271-286,共16页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.U20A20130);the Fundamental Research Funds for the Central Universities (No.FRF-TP-20-03B)。

摘　　要：The synthesis process of conventional Mn-based denitrification catalysts is relatively complex and expensive.In this paper,a resource application of chlorella was proposed,and a Chlorella@Mn composite denitrification catalyst was innovatively synthesized by electrostatic interaction.The Chlorella@Mn composite denitrification catalyst prepared under the optimal conditions(0.54 g/L Mn^(2+)concentration,20 million chlorellas/mL concentration,450℃ calcination temperature)exhibited a well-developed pore structure and large specific surface area(122 m^(2)/g).Compared with MnOx alone,the Chlorella@Mn composite catalyst achieved superior performance,with~100%NH_(3)selective catalytic reduction(NH_(3)-SCR)denitrification activity at 100-225℃.The results of NH_(3)temperature-programmed desorption(NH_(3)-TPD)and H_(2)temperature-programmed reduction(H_(2)-TPR)showed that the catalyst had strong acid sites and good redox properties.Zeta potential testing showed that the electronegativity of the chlorella cell surface could be used to enrich with Mn^(2+).X-ray photoelectron spectroscopy(XPS)confirmed that Chlorella@Mn had a high content of Mn^(3+)and surface chemisorbed oxygen.In-situ diffuse refectance infrared Fourier transform spectroscopy(in-situ DRIFTS)experimental results showed that both Langmuir-Hinshelwood(L-H)and Eley-Rideal(E-R)mechanisms play a role in the denitrification process on the surface of the Chlorella@Mn catalyst,where the main intermediate nitrate species is monodentate nitrite.The presence of SO_(2)promoted the generation and strengthening of Bronsted acid sites,but also generated more sulfate species on the surface,thereby reducing the denitrification activity of the Chlorella@Mn catalyst.The Chlorella@Mn composite catalyst had the characteristics of short preparation time,simple process and low cost,making it promising for industrial application.

关 键 词：Chlorella@Mn catalyst NH_(3)-SCR Poisoning resistance Reaction mechanism Infuence of SO_(2) 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]