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Book
Advances in Hydrometallurgy
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ISBN: 3039289403 303928939X Year: 2020 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The development of new technologies and the increasing demand for mineral resources from emerging countries are responsible for significant tensions in the pricing of non-ferrous metals. Some metals have become strategic and critical because they are used in many technological applications such as flat panel TVs (indium), solar panel cells (indium), lithium-ion batteries for electric vehicles (lithium, cobalt), magnets (rare earth elements, such as neodymium and dysprosium), scintillators (rare earths), and aviation and medical applications (titanium); their availabilities remain limited. The secured supply of these metals is crucial to continue producing and exporting these technologies, and because the specific properties of these metals make them essential and difficult to substitute for a given industrial application. Hydrometallurgy have the advantages of being able to process low-grade ores, to allow better control of co-products, and have a lower environmental impact providing that the hydrometallurgical route is optimized and cheap. The need to develop sustainable, efficient, and cheap processes to extract metals from complex and poor polymetallic matrices is real. The aim of this book was to highlight recent advances related to hydrometallurgy to face new challenges in metal production.


Book
Emissions Control Catalysis
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The important advances achieved over the past years in all technological directions (industry, energy, and health) contributing to human well-being are unfortunately, in many cases, accompanied by a threat to the environment, with photochemical smog, stratospheric ozone depletion, acid rain, global warming, and finally climate change being the most well-known major issues. These are the results of a variety of pollutants emitted through these human activities. The indications show that we are already at a tipping point that might lead to non-linear and sudden environmental change on a global scale. Aiming to tackle these adverse effects in an attempt to mitigate any damage that has already occurred and to ensure that we are heading toward a cleaner (green) and sustainable future, scientists around the world are developing tools and techniques to understand, monitor, protect, and improve the environment. Emissions control catalysis is continuously advancing, providing novel, multifunctional, and optimally promoted using a variety of methods, nano-structured catalytic materials, and strategies (e.g., energy chemicals recycling, cyclic economy) that enable us to effectively control emissions, either of mobile or stationary sources, improving the quality of air (outdoor and indoor) and water and the energy economy. Representative cases include the abatement and/or recycling of CO2, CO, NOx, N2O, NH3, CH4, higher hydrocarbons, volatile organic compounds (VOCs), particulate matter, and specific industrial emissions (e.g., SOx, H2S, dioxins aromatics, and biogas). The “Emissions Control Catalysis” Special Issue has succeeded in collecting 22 high-quality contributions, included in this MDPI open access book, covering recent research progress in a variety of fields relevant to the above topics and/or applications, mainly on: (i) NOx catalytic reduction from cars (i.e., TWC) and industry (SCR) emissions; (ii) CO, CH4, and other hydrocarbons removal, and (iii) CO2 capture/recirculation combining emissions control with added-value chemicals production.

Keywords

LNT --- NSR --- NOx storage --- phosphorous --- deactivation --- poisoning --- electrochemical reduction --- CO2 --- CuO --- TiO2 --- ethanol --- cerium-doped titania --- sulfur-tolerant materials --- organic compounds purification --- diesel oxidation catalyst --- vehicle exhaust --- chemical looping reforming --- hydrogen --- oxygen carrier --- CeO2 --- nanorod --- selective catalytic reduction --- nitric oxide --- ammonia --- Cu/ZSM-5 --- cerium --- zirconium --- CO2 electroreduction --- CO2 valorization --- Cu catalyst --- particle size --- PEM --- acetaldehyde production --- methanol production --- Ce-based catalyst --- stepwise precipitation --- diesel exhaust --- nitrogen oxides abatement --- electrochemical promotion --- NEMCA --- palladium --- ionic promoter --- nanoparticles --- yttria-stabilized zirconia --- direct NO decomposition --- PGM oxide promotion --- PdO vs. PtO --- in-situ FT-IR --- NO adsorption properties --- redox properties --- sintered ore catalyst --- sulfate --- In-situ DRIFTS --- SCR --- copper-ceria catalysts --- hydrothermal method --- CO oxidation --- copper clusters --- nanoceria --- SOECs --- RWGS reaction kinetics --- Au–Mo–Fe-Ni/GDC electrodes --- high temperature H2O/CO2 co-electrolysis --- platinum --- Rhodium --- iridium --- NO --- N2O --- propene --- CO --- methane --- alkali --- alkaline earth --- platinum group metals --- deNOx chemistry --- lean burn conditions --- TWC --- catalyst promotion --- EPOC --- NH3-SCR --- nanostructure --- kinetics --- thermodynamics --- manganese oxides --- Co3O4 --- complete CH4 oxidation --- hydrothermal synthesis --- precipitation --- Pd/BEA --- Cold start --- Pd species --- NOx abatement --- ammonia oxidation --- response surface methodology --- desirability function --- Box-Behnken design --- carbon dioxide --- hydrogenation --- heterogeneous catalysis --- plasma catalysis --- value-added chemicals --- methanol synthesis --- methanation --- Catalyst --- (NH4)2SO4 --- deNOx --- H2O and SO2 poisoning --- low-temperature selective catalytic reduction --- de-NOx catalysis --- SO2/H2O tolerance --- transition metal-based catalysts --- perovskite --- catalytic coating --- cathodic sputtering method --- n/a --- Au-Mo-Fe-Ni/GDC electrodes

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