Magnesia flue gas desulfurization is a promising process for small to medium scale industrial coal-fired boilers in order to reduce sulfur dioxide emissions, in which oxidation control of magnesium sulfite is of great importance for the recycling of products. Effects of four inhibitors were compared by kinetic experiments indicating that ascorbic acid is the best additive, which retards the oxidation process of magnesium sulfite in trace presence. The macrokinetics of magnesium sulfite oxidation inhibited by ascorbic acid were studied. Effects of the factors, including ascorbic acid concentration, magnesium sulfite concentration, oxygen partial pressure, pH, and temperature, were investigated in a stirred reactor with bubbling. The results show that the reaction rate is -0.55 order in ascorbic acid, 0.77 in oxygen partial pressure, and zero in magnesium sulfite concentration, respectively. The apparent activation energy is 88.0 kJ mol(-1). Integrated with the kinetic model, it is concluded that the oxidation rate of magnesium sulfite inhibited by ascorbic acid is controlled by the intrinsic chemical reaction. The result provides a useful reference for sulfite recovery in magnesia desulfurization.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2013.04.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of K doping on ZnCoO spinel catalysts for low-temperature catalytic NO decomposition in the presence of inhibitors.
Chemosphere
November 2024
Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea; University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea. Electronic address:
The recent development of NH as a fuel has led to significant emissions of NO, a major greenhouse gas. Direct catalytic NO decomposition (de-NO) is a promising technology for NO emissions control because it effectively decomposes NO at low temperatures without requiring reducing agents or producing other pollutants. In marine applications, to improve the flame properties, NH is often mixed with marine diesel oil, which contains sulfur.
View Article and Find Full Text PDFIn Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation.
Environ Sci Technol
March 2023
Hebei Key Laboratory of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
Hexavalent chromium (Cr(VI)) is a highly toxic substance in wastewater, triggering grievous detriment to aquatic life and human health. Magnesium sulfite is spawned along with the desulfurization process in coal-fired power plants, which is usually disposed of as solid waste. Here, a "waste control by waste" method was proposed upon the redox of Cr(VI)-sulfite, in which highly toxic Cr(VI) is detoxicated and sequent enriched on a novel biochar-induced cobalt-based silica composite (BISC) due to the forced electron transfer from chromium to surface hydroxyl.
View Article and Find Full Text PDFZero-valent bimetallic catalyst/absorbent for simultaneous facilitation of MgSO oxidation and arsenic uptake.
Sci Total Environ
October 2022
Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China. Electronic address:
Cobalt (Co)-based catalysts can efficiently reduce the heat waste from sulfate concentration by enhancing sulfite oxidation during wet flue gas desulfurization system. However, arsenic (As) can poison such catalysts and migrate into the sulfate by-products, resulting in severe secondary pollution. In this study, a zero-valent Co/iron (Fe)-based nanoparticle (NZV-CoFe) was fabricated and applied as a bifunctional catalyst/adsorbent.
View Article and Find Full Text PDFBuffer effect of MgO on NaSO to stabilize S(IV) for the enhancement in simultaneous absorption of NO and SO from non-ferrous smelting gas.
Environ Sci Pollut Res Int
October 2022
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
Oxidation-reduction-absorption based on sulfite is a promising process for simultaneous removal of NO and SO. However, excessive oxidation of sulfite and competitive absorption between NO and SO limit its application. A matching strategy between antioxidants and alkaline agents has been proposed to solve these problems and enhance the absorption process.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!