Synthesis of a SiO<inf>2</inf>/Co(OH)<inf>2</inf> Nanocomposite Catalyst for SO<inf>X</inf>/NO<inf>X</inf> Oxidation in Flue Gas

Sulfur and nitrogen oxides (SOX/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 H2O2 oxidants to produce (NH4)2SO4 and NH4NO3 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 H2O2/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.

Bibliographic Details

Main Authors:	Khabra, Alon, Cohen, Haim, Pinhasi, Gad A., Querol, Xavier, Córdoba Sola, Patricia, Zidki, Tomer
Other Authors:	0000-0003-0310-1395
Format:	artículo biblioteca
Language:	English
Published:	MDPI 2023-01-01
Subjects:	Wet scrubber, Fertilizer manufacturing, Nanocomposite oxidation catalyst, NO oxidation X, SO oxidation X, Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation,
Online Access:	http://hdl.handle.net/10261/361387 https://api.elsevier.com/content/abstract/scopus_id/85146420639
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