The structure evolution of biochar from biomass pyrolysis and its correlation with gas pollutant adsorption performance

V2O5-modified Mn-Ce/AC catalyst with high SO2 tolerance for low-temperature NH3-SCR of NO

Iron doped effects on active sites formation over activated carbon supported Mn-Ce oxide catalysts for low-temperature SCR of NO

Review of arsenic behavior during coal combustion: Volatilization, transformation, emission and removal technologies

A severe problem associated with combustion of fossil fuels and biomass in the quest for heat and power generation is the release of acidic gases. This posed great health and environmental concerns, and their presence in sufficient amount in flue gas affects the performance of CO2 capture system through formation of heat resistant salts on reaction with the capture medium. Among the various alternatives, removal of the SO2 and NOx gases by adsorption on surface modified activated carbon from renewable sources has proven to be an efficient and robust technology which is attributed to the presence of immobilized chemical species on the carbon surface providing the necessary affinity with the target gaseous pollutants. Thus, the present review aimed at providing a cutting-edge critical assessment of research outputs on SO2 and NOx adsorption from flue gas by surface modified activated carbon. Conspicuously, modification mechanisms, surface characterization, surface chemistry and application of surface modification of activated carbon were discussed elaborately.

Surface modification of activated carbon for adsorption of SO2 and NOX: A review of existing and emerging technologies

In situ IR comparative study on N2O formation pathways over different valence states manganese oxides catalysts during NH3–SCR of NO

Performance impact and poisoning mechanism of arsenic over commercial V2O5–WO3/TiO2 SCR catalyst

Carbon materials have shown excellent low temperature denitrification characteristic in the flue gas. To improve the denitrification efficiency, metallurgical coke, biomass char and semi-coke were modified by steam or acid. Taguchi experimental design was used to determine the influence of carbon material type, modified time and process temperature etc. on the denitrification rates. Three carbon materials before and after modification were characterized by SEM, BET and FTIR. The results showed that a large amount of specific surface area and smaller pore size were beneficial for NO x removal with NH 3 , but the surface acidic functional groups were crucial for denitrification. For steam modification, the optimal promotion of denitrification rate was semi-coke, modified by steam at 973 K for 140 min and the nitrogen oxides removal rate was 16.0%. For acid modification, the optimal combination was biomass char, with the deashing acid treatment before oxidation acid treatment at 353 K and the nitrogen oxides removal rate was 24.0%.

Selection of carbon materials and modification methods in low-temperature sintering flue gas denitrification

The effects of Al2O3, MgO, and binary basicity on the viscosity of high alumina blast furnace slag are studied systematically at the temperatures of 1773 K and below using the orthogonal experimental design method. The results show that, at fixed binary basicity (CaO/SiO2) between 1.1 and 1.2, higher Al2O3 content increase the slag viscosity due to the polymerization of the aluminate structures. At fixed Al2O3 content between 15 and 20%, increasing the CaO/SiO2 from 1.1 to 1.2 lead to lower viscosity due to the depolymerization of the aluminate structures. At fixed MgO between 9 and 11%, both increasing Al2O3 content and CaO/SiO2 can make the melting temperature increase. In addition, the viscosity data of high alumina blast furnace slag was in accordance with the estimated values of viscosity by Riboud model. Understanding the mechanism of Al2O3, MgO, and binary basicity on the viscosity of blast furnace slag can provide a promising method for optimizing its viscosity value and improving the blast furnace operation.

Lu Yao

Papers

Iron doped effects on active sites formation over activated carbon supported Mn-Ce oxide catalysts for low-temperature SCR of NO

In situ IR comparative study on N2O formation pathways over different valence states manganese oxides catalysts during NH3–SCR of NO

Performance impact and poisoning mechanism of arsenic over commercial V2O5–WO3/TiO2 SCR catalyst

Selection of carbon materials and modification methods in low-temperature sintering flue gas denitrification

Effect of Al2O3, MgO, and CaO/SiO2 on Viscosity of High Alumina Blast Furnace Slag