Catalytic NOx Reduction in Net Oxidizing Exhaust Gas

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

“…The most active catalyst in the class is Cu/ZSM-5, 237,238 where ZSM-5 is a type of zeolite with an MFI structure. Its activity is suppressed significantly by water vapor, which is present at ∼10% in engine exhaust.…”

Effect of addition of Zn on the catalytic activity of a Co/HZSM-5 catalyst for the SCR of NOx with CH4

“…Reductants such as propane, propene and ethylene have been extensively researched on zeolite-and alumina-supported catalysts [1][2][3][4][5][6][7][8][9]. Use of methane as reducing agent, pioneered by the work of Li and Armor [10], has attracted particular interest, since methane is almost present in all combustion exhausts, particularly in the gas-cogeneration system.…”

A Review on Selective Catalytic Reduction for NOX Reduction

“…Pre-Oxidation:-The selectivity for high NO 2 formation at lower temperature is the main purpose of this design. [12][13][14]  The primary effect of the pre-oxidation catalyst is to increase the NO 2 fraction of the exhaust this permitting the fast SCR reaction.  The second effect is a considerable oxidation of hydrocarbon which inhibits the SCR reaction at low temperature; this will be also help increase the NO X conversion at low temperature.…”