Experiment Study On Simultaneous Removal Of Formaldehyde And Elemental Mercury Using CuO-MnO_x Supported On Pinecone Biochar

Formaldehyde（HCHO）is one of volatile organic compounds with the mutagenicity,carcinogenicity,teratogenicity.It can cause various diseases and harm human health.Mercury（Hg）is a global pollutant with biological accumulating,volatile,persistence.Elemental mercury（Hg⁰）is difficult removal mercuty forms in coal-fired flue gas.For example,Japanese minamata disease seriously affect human health which ar oused our concern.Therefore,formaldehyde and mercury get the attention of researchers at home and abroad.The key need developed the effective adsorption-catalyst to control pollution of HCHO and Hg⁰.This paper introduces the preparation method of a series of modified pinecone biochar loaded CuO and MnO_x using impregnationmethod.A series of CuMn/HBC adsorption-catalysts remove simultaneously HCHO and Hg⁰ within the temperature range of 100-300℃.The effects of the reaction temperature,metal loading val ue,Cu/Mn molar ratio and flue gas components（O₂、NO、SO₂）were investigated to explore the simultaneous removal performance of the samples for HCHO and Hg⁰.According to the requirements of commericial application,the stability test of12%CuMn/HBC carried out.The samples were characterized by SEM,XRD,BET,XPS,ICP-AES,FTIR and H₂-TPR to analyze to analyze samples of physical and chemical properties as well as the influence factors on the influence of the structure of the sample.Finally,combined with the analysis of experimental results and characterization,we find the mechanism of removing formaldehyde and and the elemental mercury in simulated flue gas.The experimental results show that compared with Cu/HBC and Mn/HBC,samples loaded CuO-MnO_x has great removal efficiency for HCHO and Hg⁰.Optimal sample is Cu/Mn mole ratio of 1:1,12%load value,175℃reaction temperature.And12%CuMn/HBC showed highest removal efficiency of HCHO and Hg⁰ at 175°C corresponding to 89%and 83%,respectively.In the effect of gas components of tests,O₂ had positive impact on the removal of HCHO and Hg⁰.Besides,NO showed slightly positive influence and SO₂ had an inhibitive effect on the removal efficiency of Hg⁰,while NO and SO₂ both exhibited prohibitive impact on the HCHO conversion efficiency.In the part of the interrelationship between HCHO and Hg⁰,the addition of HCHO had a great influence on the removal performan ce of Hg⁰,but the presence of Hg⁰ had little effect on the removal of HCHO.12%CuMn/HBC had the highest specific surface area and pore volume from the BET characterization analysis.H₂-TPR analysis showed the presence of strong synergistic effect between Cu and Mn.MnO₂ and CuO in the CuMn/HBC sorbent-catalysts were highly dispersed or amorphous state obtained from XRD and XPS analysis.XPS results illustrated O_αand O_βtook part in the reaction.