FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W200506657> ?p ?o ?g. }

• W200506657 abstract "Mercury is a known pollutant that has detrimental effect on human health and environment. The anthropogenic emissions of mercury account for 10 to 30% of worldwide mercury emissions. There is a need to control/reduce anthropogenic mercury emissions. Many mercury control technologies are available but their effectiveness is dependent on the chemical form of mercury, because different chemical forms of mercury have different physical and chemical properties. Mercury leaves the boiler in its elemental form but goes through various transformations in the post-combustion zone. There is a need to understand how fly ash and flue gas composition affect speciation, partitioning, and reactions of mercury under the full range of post-combustion zone conditions. This knowledge can then be used to predict the chemical transformation of mercury (elemental, oxidized or particulate) in the post combustion zone and thus help with the control of mercury emissions from coal-burning power plants. To accomplish this goal present study was conducted using five coal fly ashes. These ashes were characterized and their catalytic activity was compared under selected reaction conditions in a fixed bed reactor. Based on the results from these fly ash experiments, three key components (carbon, iron oxide and calcium oxide) were chosen. These three components were then used to prepare model fly ashes. Silica/alumina was used as a base for these model fly ashes. One, two or three component model fly ashes were then prepared to investigate mercury transformation reactions. The third set of experiments was performed with CuO and CuCl2 catalysts to further understand the mercury oxidation process. Based on the results of these three studies the key components were predicted for different fly ash compositions under variety of flue gas conditions. A fixed bed reactor system was used to conduct this study. In all the experiments, the inlet concentration of Hg0(g) was maintained at 35 {micro}g/m3 using a diffusion tube as the source of Hg0(g). All experiments were conducted using 4% O2 in nitrogen mix as a reaction gas, and other reactants (HCl, H2O and SO2, NO2, Br2) were added as required. The fixed bed reactor was operated over a temperature range of 200 to 400 C. In each experiment, the reactor effluent was analyzed using the modified Ontario-Hydro method. After each experiment, fly ash particles were also analyzed for mercury. The results show that the ability of fly ash to adsorb and/or oxidize mercury is primarily dependent on its carbon, iron and calcium content. There can be either one or more than one key component at a particular temperature and flue gas condition. Surface area played a secondary role in effecting the mercury transformations when compared to the concentration of the key component in the fly ash. Amount of carbon and surface area played a key important role in the adsorption of mercury. Increased concentration of gases in the flue gas other than oxygen and nitrogen caused decreased the amount of mercury adsorbed on carbon surface. Mercury adsorption by iron oxide primarily depended on the crystalline structure of iron oxide. {alpha}-Iron oxide had no effect on mercury adsorption or oxidation under most of the flue gas conditions, but ?-iron oxide adsorbed mercury under most of the flue gas conditions. Bromine is a very good oxidizing agent for mercury. But in the presence of calcium oxide containing fly ashes, all the oxidized mercury would be reduced to elemental form. Among the catalysts, it was observed that presence of free lattice chlorine in the catalyst was very important for the oxidation of mercury. But instead of using the catalyst alone, using it along with carbon may better serve the purpose by providing the adsorption surface for mercury and also some extra surface area for the reaction to occur (especially for fly ashes with low surface area)." @default.
• W200506657 created "2016-06-24" @default.
• W200506657 creator A5049278639 @default.
• W200506657 creator A5050156616 @default.
• W200506657 date "2008-12-31" @default.
• W200506657 modified "2023-09-28" @default.
• W200506657 title "Fly Ash and Mercury Oxidation/Chlorination Reactions" @default.
• W200506657 doi "https://doi.org/10.2172/1009958" @default.
• W200506657 hasPublicationYear "2008" @default.
• W200506657 type Work @default.
• W200506657 sameAs 200506657 @default.
• W200506657 citedByCount "0" @default.
• W200506657 crossrefType "report" @default.
• W200506657 hasAuthorship W200506657A5049278639 @default.
• W200506657 hasAuthorship W200506657A5050156616 @default.
• W200506657 hasBestOaLocation W2005066572 @default.
• W200506657 hasConcept C107872376 @default.
• W200506657 hasConcept C127413603 @default.
• W200506657 hasConcept C178790620 @default.
• W200506657 hasConcept C185592680 @default.
• W200506657 hasConcept C199360897 @default.
• W200506657 hasConcept C2777777548 @default.
• W200506657 hasConcept C39432304 @default.
• W200506657 hasConcept C41008148 @default.
• W200506657 hasConcept C548081761 @default.
• W200506657 hasConcept C87343466 @default.
• W200506657 hasConceptScore W200506657C107872376 @default.
• W200506657 hasConceptScore W200506657C127413603 @default.
• W200506657 hasConceptScore W200506657C178790620 @default.
• W200506657 hasConceptScore W200506657C185592680 @default.
• W200506657 hasConceptScore W200506657C199360897 @default.
• W200506657 hasConceptScore W200506657C2777777548 @default.
• W200506657 hasConceptScore W200506657C39432304 @default.
• W200506657 hasConceptScore W200506657C41008148 @default.
• W200506657 hasConceptScore W200506657C548081761 @default.
• W200506657 hasConceptScore W200506657C87343466 @default.
• W200506657 hasLocation W2005066571 @default.
• W200506657 hasLocation W2005066572 @default.
• W200506657 hasOpenAccess W200506657 @default.
• W200506657 hasPrimaryLocation W2005066571 @default.
• W200506657 hasRelatedWork W2067930696 @default.
• W200506657 hasRelatedWork W2082223407 @default.
• W200506657 hasRelatedWork W2162974804 @default.
• W200506657 hasRelatedWork W2184592571 @default.
• W200506657 hasRelatedWork W2371444453 @default.
• W200506657 hasRelatedWork W2377158579 @default.
• W200506657 hasRelatedWork W2899084033 @default.
• W200506657 hasRelatedWork W2948873383 @default.
• W200506657 hasRelatedWork W3027757048 @default.
• W200506657 hasRelatedWork W2158542451 @default.
• W200506657 isParatext "false" @default.
• W200506657 isRetracted "false" @default.
• W200506657 magId "200506657" @default.
• W200506657 workType "report" @default.