1. Synthesis of a SiO 2 /Co(OH) 2 Nanocomposite Catalyst for SO X /NO X Oxidation in Flue Gas.
- Author
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Khabra, Alon, Cohen, Haim, Pinhasi, Gad A., Querol, Xavier, Córdoba Sola, Patricia, and Zidki, Tomer
- Subjects
FLUE gases ,FLUE gas desulfurization ,SCRUBBER (Chemical technology) ,OXIDATION ,ATMOSPHERIC oxygen ,NANOCOMPOSITE materials ,NITROGEN oxides ,DESULFURIZATION - Abstract
Sulfur and nitrogen oxides (SO
X /NOX ) are the primary air toxic gas pollutants emitted during fuel combustion, causing health and environmental concerns. Therefore, their emission in flue gases is strictly regulated. The existing technologies used to decrease SOX /NOX content are flue gas desulfurization, which necessitates high capital and operating costs, and selective catalytic reduction, which, in addition to these costs, requires expensive catalysts and high operating temperatures (350–400 °C). New wet scrubbing processes use O3 or H2 O2 oxidants to produce (NH4 )2 SO4 and NH4 NO3 fertilizers upon ammonia injection. However, these oxidants are expensive, corrosive, and hazardous. SiO2 /Co(OH)2 nanocomposites are presented here as potential catalysts for SOX /NOX oxidation in wet scrubber reactors to scrub these toxic gases using atmospheric oxygen as the oxidant at relatively low temperatures of 60–90 °C. Several silica-cobalt-oxide-based nanocomposites were synthesized as potential catalysts at different concentrations and temperatures. The nanocomposite catalysts were characterized and exhibited excellent catalytic properties for SOX /NOX oxidation using atmospheric oxygen as the oxidant, replacing the problematic H2 O2 /O3 . We thus propose SiO2 -supported Co(OH)2 nanoparticles (NPs) as excellent catalysts for the simultaneous scrubbing of polluting SOX /NOX gases in flue gases using atmospheric O2 as the oxidation reagent at a relatively low-temperature range. [ABSTRACT FROM AUTHOR]- Published
- 2023
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