Insights into the effect of flue gas on synergistic elimination of toluene and NO over V2O5-MoO3(WO3)/TiO2 catalysts

Cu-VWT Catalysts for Synergistic Elimination of NOx and Volatile Organic Compounds from Coal-Fired Flue Gas

“…PAHs are found in coal-fired flue gas, and commercial VWT catalysts polymerize certain VOCs to PAHs . Accordingly, the effectiveness of Cu5-VWT in preventing PAH production and catalytic oxidation was studied.…”

“…In comparison, the corresponding CO x selectivities of Cu5-VWT were as high as 99, 98, and 97%, respectively. In addition, the results showed that the number of byproducts detected in the exhaust gas of toluene oxidation by VWT reached 24, 23 while no other byproducts were detected in the exhaust gas of toluene oxidation by Cu-VWT except for impurities (Figure S24), indicating that the Cu-VWT catalyst has an excellent oxidation performance and can effectively reduce the generation of various byproducts.…”

“…PAHs are found in coal-fired flue gas, and commercial VWT catalysts polymerize certain VOCs to PAHs. 23 Accordingly, the effectiveness of Cu5-VWT in preventing PAH production and catalytic oxidation was studied. Table S5 shows the concentrations of 16 PAHs on the catalyst surface in the presence of flue gas.…”

“…12,16−21 Some studies have shown that VWT catalysts not only have a certain catalytic oxidation performance toward VOCs 22 but can also promote the generation of dioxins (PCDD/F), polychlorinated byproducts, polycyclic aromatic hydrocarbons (PAHs), and other byproducts, resulting in poor CO x selectivity and even greater toxicity of the emissions. 23 Therefore, the deep oxidation of VOCs cannot be achieved with commercial VWT catalysts. At the same time, traditional catalysts for the catalytic oxidation of VOCs will be prematurely aged and inactivated in the complex flue gas atmosphere (SO 2 , NO, NH 3 , and H 2 O).…”

“…There is usually a spare space in the SCR process section. Considering the technical economy, an optimal solution would be to realize the synergistic removal of VOCs and NO x in the SCR section by using a new catalyst or combination of catalysts in the spare layer. − V 2 O 5 -WO 3 /TiO 2 (VWT) is a commercial NH 3 -SCR catalyst that has been widely used. ,− Some studies have shown that VWT catalysts not only have a certain catalytic oxidation performance toward VOCs but can also promote the generation of dioxins (PCDD/F), polychlorinated byproducts, polycyclic aromatic hydrocarbons (PAHs), and other byproducts, resulting in poor CO x selectivity and even greater toxicity of the emissions . Therefore, the deep oxidation of VOCs cannot be achieved with commercial VWT catalysts.…”