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Synthesis And Charecterization Of Novel Sorbent For Vapor Phase Mercury Removal
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Book Synopsis Synthesis and Charecterization of Novel Sorbent for Vapor Phase Mercury Removal by : Arikrishnan Chandrasekaran
Download or read book Synthesis and Charecterization of Novel Sorbent for Vapor Phase Mercury Removal written by Arikrishnan Chandrasekaran and published by . This book was released on 2004 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Nano-structured Chelating Adsorbents for the Direct Removal of Mercury Vapor from Flue Gases by :
Download or read book Synthesis and Characterization of Nano-structured Chelating Adsorbents for the Direct Removal of Mercury Vapor from Flue Gases written by and published by . This book was released on 2004 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal-Fired utility boilers are currently the largest single-known source of anthropogenic mercury emissions in the United States. In this research, the potential of gas-phase chelating sorbents for the removal of mercury vapor from flue-gases emitted from coal-fired power plants has been investigated. Chelating adsorbents are currently limited to the removal of mercury from liquid phase. The novel gas-phase chelating adsorbents that have been developed in this research uniquely combine a chelating ligand with an ionizing surface nano-layer on a mesoporous substrate. This enables selective, multidentate adsorption of mercury directly from the gas phase. Different chelating ligands including cysteine, dithizone (CPTS-DZ), 3-mercaptopropyltrimethoxysilane (MPTS-Silica), and 2-mercaptobenzothiazole (APTS-MBT), were immobilized on silica substrates. The synthesis of the adsorbents is described, and detailed characterization data are reported. The theoretical (equilibrium) capacity for mercury removal using these adsorbents is in the range of 17-117 mg Hg/g. Evaluation of the thermal stability of the chelating adsorbents showed that cysteine activated adsorbent is stable at operating temperatures lower than 135°C. The adsorbents with higher operating temperature limits (CPTS-DZ, MPTS-Silica, and APTS-MBT) can operate up to 160°C. Coating of the silica substrate with different ratios of the room-temperature molten salt, methylpolyoxyethylene(15)octadecanammonium chloride (MEC), was performed and the optimum concentration was determined to be 20-30 wt%. The capability of the MEC ionic solvent to absorb mercury vapor and ionize it has also been studied. MEC solvent has high solubility for mercuric chloride (HgCl2), but limited solubility for elemental mercury (Hg0). The capture efficiency of the chelating adsorbents for HgCl2 under simulated flue-gas conditions has been investigated. No breakthrough of the pollutant was observed in extended experiments. Formation of chelate complex between the captured HgCl2 and the chelating ligands was confirmed with Far-FTIR. It is postulated that the Hg2+ capture mechanism is a combination of solubility in the surface coating and chelate formation. Homogeneous, as well as heterogeneous reduction mechanisms of HgCl2 have been investigated. Results showed that SO2 and H2O vapor are the main factors affecting Hg2+ reduction, and that the presence of HCl is critical for maintaining Hg2+ in its oxidized form.
Book Synopsis Adsorbents for Aqueous and Vapor Phase Mercury Separation by : Ajay Makkuni
Download or read book Adsorbents for Aqueous and Vapor Phase Mercury Separation written by Ajay Makkuni and published by . This book was released on 2009 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis Characterization and Performance of Adsorbents Foe Mercury Vapor Removal by : Khairiraihanna Johari
Download or read book Synthesis Characterization and Performance of Adsorbents Foe Mercury Vapor Removal written by Khairiraihanna Johari and published by . This book was released on 2015 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Materials for Use as Adsorbents in Gas Separations by : Nick D. Hutson
Download or read book Synthesis and Characterization of Novel Materials for Use as Adsorbents in Gas Separations written by Nick D. Hutson and published by . This book was released on 2000 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal Fired Flue Gas Mercury Emission Controls by : Jiang Wu
Download or read book Coal Fired Flue Gas Mercury Emission Controls written by Jiang Wu and published by Springer. This book was released on 2015-03-17 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) is one of the most toxic heavy metals, harmful to both the environment and human health. Hg is released into the atmosphere from natural and anthropogenic sources and its emission control has caused much concern. This book introduces readers to Hg pollution from natural and anthropogenic sources and systematically describes coal-fired flue gas mercury emission control in industry, especially from coal-fired power stations. Mercury emission control theory and experimental research are demonstrated, including how elemental mercury is oxidized into oxidized mercury and the effect of flue gas contents on the mercury speciation transformation process. Mercury emission control methods, such as existing APCDs (air pollution control devices) at power stations, sorbent injection, additives in coal combustion and photo-catalytic methods are introduced in detail. Lab-scale, pilot-scale and full-scale experimental studies of sorbent injection conducted by the authors are presented systematically, helping researchers and engineers to understand how this approach reduces the mercury emissions in flue gas and to apply the methods in mercury emission control at coal-fired power stations. Readers will arrive at a comprehensive understanding of various mercury emission control methods that are suitable for industrial applications. The book is intended for scientists, researchers, engineers and graduate students in the fields of energy science and technology, environmental science and technology and chemical engineering.
Book Synopsis Advanced Adsorbents for Capture of Vapor-phase Mercury and Other Toxic Components from Flue Gas by : Juan He
Download or read book Advanced Adsorbents for Capture of Vapor-phase Mercury and Other Toxic Components from Flue Gas written by Juan He and published by . This book was released on 2013 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: During coal combustion, mercury and arsenic are volatized and are present in multiple forms in the gas phase; similarly, the formation of nitrogen oxides in flue gas depends on nitrogen content of the coal and oxygen available to react with nitrogen. New approaches for cost-effective control of mercury and other pollutants are necessary. In this work, a group of room temperature ionic liquid coated nanostructured chelating adsorbents was developed and used for gas-phase mercury and arsenic adsorption; the simultaneous removal of mercury and nitrogen oxide using ceria-modified manganese oxide/titania materials was investigated. Three thermally robust adsorbents, 25 wt% [bmim]Cl coated-MPTS-Si, 25 wt% [bmim]Cl-MPTS-MCF and 25 wt% [bmim]Cl-Ambersep[superscript TM] GT74 were synthesized and demonstrated to be effective adsorbents for simultaneous capture of oxidized and elemental mercury at 160°C. Mercury from vapor phase dissolves in the [bmim]Cl ionic liquid layer;and subsequently bonds to the chelating ligands of MPTS or directly coordinates with the sulfur-containing groups from Ambersep[superscript TM]GT74 resin. In fixed-bed adsorption experiments, the 25 wt% [bmim]Cl-MPTS-Si exhibited the largest mercury (Hg2 and Hg0) capacity in an inert atmosphere. A mathematical model was developed to describe mercury removal based on the experimental data measured at laboratory-scale. To synthesize adsorbents for both mercury and arsenic capture, both [bmim]Cl and an amino acid-based RTIL, [TBP][Tau], were supported on a silica gel with high surface area and accessible mesopores. In both fixed-bed and batch adsorption modes, all of the RTIL-coated silica adsorbents can effectively remove Hg0 and As(III) simultaneously, and exhibited high As(III) capacities. Because of the high solubility of CO2 in the [TBP][Tau] RTIL, the presence of CO2 caused a negative effect on the Hg0 and As(III) adsorption performance of [TBP][Tau]-Si. High surface area ceria-titania materials are used as supports for manganese oxide for both warm-gas mercury capture and low temperature selective catalytic reduction. Remarkably, these materials exhibit high Hg0 adsorption capacities and excellent NO removal performance both in single-component tests and in combined NO and Hg0 removal experiments at 175°C. For the Hg0 adsorption, MnOx/CeO2-TiO2 adsorbents had large Hg0 capacities up to 37 mg g−1. SO2 inhibited Hg0 adsorption on the surface of MnOx, but the CeO2-TiO2 support retained most of its Hg0 capacity in the presence of 100 ppm SO2 The simultaneous capture of Hg0 and Hg2 at 175°C was observed using CeO2-TiO2 support. Both the NO adsorption and co-adsorption of NO + CO can be found over the surface of MnOx/CeO2-TiO2 materials. The results of XPS analysis suggest that the presence of lattice oxygen play important role on the mercury and NO adsorption, with great formation of HgO and nitrate species; in the presence of CO in the feed gas, mercury adsorption doesn't inhibit the SCR activity of NO. In summary, the nanostructured, RTILs coated chelating adsorbents and manganese supported on ceria-titania oxide materials were successfully developed and studied for removal of gas-phase mercury and other toxic components. The experimental results suggest these novel adsorbents could be technically feasible for multi-pollutants control in coal combustion.
Book Synopsis Design and Development of Nanostructured Thin Films by : Antonella Macagnano
Download or read book Design and Development of Nanostructured Thin Films written by Antonella Macagnano and published by MDPI. This book was released on 2020-05-13 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their unique size-dependent physicochemical properties, nanostructured thin films are used in a wide range of applications from smart coating and drug delivery to electrocatalysis and highly-sensitive sensors. Depending on the targeted application and the deposition technique, these materials have been designed and developed by tuning their atomic-molecular 2D- and/or 3D-aggregation, thickness, crystallinity, and porosity, having effects on their optical, mechanical, catalytic, and conductive properties. Several open questions remain about the impact of nanomaterial production and use on environment and health. Many efforts are currently being made not only to prevent nanotechnologies and nanomaterials from contributing to environmental pollution but also to design nanomaterials to support, control, and protect the environment. This Special Issue aims to cover the recent advances in designing nanostructured films focusing on environmental issues related to their fabrication processes (e.g., low power and low cost technologies, the use of environmentally friendly solvents), their precursors (e.g., waste-recycled, bio-based, biodegradable, and natural materials), their applications (e.g., controlled release of chemicals, mimicking of natural processes, and clean energy conversion and storage), and their use in monitoring environment pollution (e.g., sensors optically- or electrically-sensitive to pollutants)
Book Synopsis Development and Evaluation of Low-cost Sorbents for Removal of Mercury Emissions from Coal Combustion Flue Gas by :
Download or read book Development and Evaluation of Low-cost Sorbents for Removal of Mercury Emissions from Coal Combustion Flue Gas written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Determining how physical and chemical properties of sorbents affect vapor-phase mercury adsorption has led to potential approached for tailoring the properties of sorbents for more effective mercury removal. ... Objectives: to determine how physical and chemical properties of sorbents affect mercury adsoprtion; to develop more cost-effective sorbents"--P. v.
Book Synopsis Seminari Milanesi e una data memoranda nella loro storia 12-13 maggio 1935 by :
Download or read book Seminari Milanesi e una data memoranda nella loro storia 12-13 maggio 1935 written by and published by . This book was released on 1935 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Nano-structured Sorbents for Elemental and Oxidized Mercury Removal from Flue Gas by : Lei Ji
Download or read book Novel Nano-structured Sorbents for Elemental and Oxidized Mercury Removal from Flue Gas written by Lei Ji and published by . This book was released on 2008 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermally robust chelating adsorbents, 3-mercaptopropyltrimethoxysilane silica (MPTS-silica) and 3-aminopropyltiethoxysilane 2-mercaptobenzothialzole silica (APTS-MBT-silica), were proven to be very effective in capture HgCl2 from simulated flue gas at elevated temperatures in a fixed-bed mode. For MPTS-silica, a minimum of 58 mg/g HgCl2 capacity was observed. Pore size of the silica substrate does not have significant effect while particle size was found to have a significant effect on mercury capture; this effect was believed to be due to an enhanced channeling effect for the larger particle size adsorbent. A new approach for simultaneous removal of elemental and oxidized mercury from flue gas was successfully developed by using a room temperature ionic liquid (RTIL) coating layer. Six RTILs were synthesized and tested for their potential of elemental and oxidized mercury capture. These RTIL coating layers are all thermally stable above 160°C and the coating of these RTIL does not have any negative effect on the thermal stability of the chelating ligands. 1-butyl-3-methyl-imidazolium chloride ([bmim]Cl) was identified to be the most promising RTIL for simultaneous elemental and oxidized mercury removal from flue gas. 25 wt% [bmim]Cl coated MPTS-silica showed a 10 mg/g saturated elemental mercury capacity and a minimum of 38 mg/g oxidized mercury capacity in a fixed-bed mode. A low temperature selective catalytic reduction (SCR) catalyst, manganese oxide supported on titania, was tested as a sorbent for elemental mercury capture from flue gas at high temperatures. It was shown that this material showed high mercury capacity and remained active for mercury capture even after use for NOx reduction. Water vapor and manganese loading do not have a significant effect on mercury capture. However, SO2 has a strong negative effect on mercury removal process. Bed temperature was found to have a significant effect on mercury capture process. HgO formed during the mercury adsorption process by this material and it was believed that the mercury adsorption follows Mars-Maessen mechanism.
Book Synopsis Investigation and Demonstration of Dry Carbon-Based Sorbent Injection for Mercury Control by : Terry Hunt
Download or read book Investigation and Demonstration of Dry Carbon-Based Sorbent Injection for Mercury Control written by Terry Hunt and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Public Service Company of Colorado and ADA Technologies, Inc. have performed a study of the injection of activated carbon for the removal of vapor-phase mercury from coal-fired flue gas streams. The project was completed under contract to the US Department of Energy's National Energy Technology Laboratory, with contributions from EPRI and Public Service Company. The prime contractor for the project was Public Service Company, with ADA Technologies as the major subcontractor providing technical support to all aspects of the project. The research and development effort was conducted in two phases. In Phase I a pilot facility was fabricated and tests were performed using dry carbon-based sorbent injection for mercury control on a coal-fired flue gas slipstream extracted from an operating power plant. Phase II was designed to move carbon injection technology towards commercial application on coal-fired power plants by addressing key reliability and operability concerns. Phase II field work included further development work with the Phase I pilot and mercury measurements on several of PSCo's coal-fired generating units. In addition, tests were run on collected sorbent plus fly ash to evaluate the impact of the activated carbon sorbent on the disposal of fly ash. An economic analysis was performed where pilot plant test data was used to develop a model to predict estimated costs of mercury removal from plants burning western coals. Testing in the pilot plant was undertaken to quantify the effects of plant configuration, flue gas temperature, and activated carbon injection rate on mercury removal. All three variables were found to significantly impact the mercury removal efficiency in the pilot. The trends were clear: mercury removal rates increased with decreasing flue gas temperature and with increasing carbon injection rates. Mercury removal was much more efficient with reverse-gas and pulse-jet baghouse configurations than with an ESP as the particulate control device. The native fly ash of the host unit provided significant mercury removal capacity, so that the activated carbon sorbent served as an incremental mercury removal mechanism. Tests run to characterize the waste product, a combination of fly ash and activated carbon on which mercury was present, showed that mercury and other RCRA metals of interest were all below Toxic Characteristic Leaching Procedure (TCLP) regulatory limits in the leachate. The presence of activated carbon in the fly ash was shown to have an effect on the use of fly ash as an additive in the manufacture of concrete, which could limit the salability of fly ash from a plant where activated carbon was used for mercury control.
Book Synopsis Synthesis and Characterization of Coconut Husk Based Biosorbents for Mercury Ions Removal from Liquid Phase by : Atiqah Abdul Aziz
Download or read book Synthesis and Characterization of Coconut Husk Based Biosorbents for Mercury Ions Removal from Liquid Phase written by Atiqah Abdul Aziz and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Sorbents for Enhanced Gas Separation Via [pi]-complexation by : Joel Padin
Download or read book New Sorbents for Enhanced Gas Separation Via [pi]-complexation written by Joel Padin and published by . This book was released on 2000 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of a Polymeric/inorganic Hybrid Sorbent by : John E. Greenleaf
Download or read book Synthesis and Characterization of a Polymeric/inorganic Hybrid Sorbent written by John E. Greenleaf and published by . This book was released on 2003 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Novel Materials for the Detection and Removal of Toxicants by : Daniel R. Jones
Download or read book Synthesis and Characterization of Novel Materials for the Detection and Removal of Toxicants written by Daniel R. Jones and published by . This book was released on 2019 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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