Abstract
Mercury pollution in the atmospheric environment is a matter of international concern. Mercury in coal-fired flue gas is the first human mercury emission source and has become the focus of national mercury pollution control. The catalytic performance of zerovalent mercury (Hg0) in coal-fired flue gas was studied by using manganese-cerium-aluminum oxide as catalyst. The effects of metal loading ratio, reaction temperature, calcination temperature, and O2 and SO2 concentration on the efficiency of Hg0 catalytic removal were investigated, and the Mn-Ce/γ-Al2O3 catalysts before and after the reaction were characterized by BET, SEM, XRD, and XPS to analyze the physicochemical properties of the samples. The results show that the mercury removal efficiency of the composite catalyst with Mn, Ce, and Al as the active component is higher than that of the single metal catalyst. The catalytic activity of Mn0.1Ce0.02Al is the best, the optimum reaction temperature is 150°C, the optimum calcination temperature is 400°C, and the O2 concentration in the conventional flue gas condition satisfies the effective oxidation of Hg0; SO2 in the flue gas can seriously inhibit the oxidation of Hg0.
Highlights
In China, the dominated energy structure is still coal currently [1]
Mercury emissions from coal-fired flue gas have become the largest source of mercury pollution [2]
Previous researches have established that chlorine is the most effective oxidant for heterogeneous mercury oxidation together with O2 and the chlorine is originated from the HCl content in flue gas via a Deacon reaction [8,9,10]
Summary
In China, the dominated energy structure is still coal currently [1]. Mercury emissions from coal-fired flue gas have become the largest source of mercury pollution [2]. E effects of metal loading, calcination temperature, and reaction conditions (flue gas temperature, O2, SO2 concentration, etc.) on the catalytic Hg0 removal efficiency were investigated experimentally. E mercury oxidation performance of the Ce0.02Mn0.1Al catalyst is shown, the calcination temperature was 100, 200, 300, 400, 500, 600, 700, and 800°C, N2 + 5%O2 flue gas condition, and the reaction temperature of mercury removal was 150°C.
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