Metal Halide Catalyst for Reduction of Nitric Oxide with Ammonia

Abstract

Counter anions of active components on catalysts were found to affect catalytic activities for NO reduction with NH3. Halide ions promoted activity in copper and iron catalysts, but lowered it in chromium and manganese catalysts. The most favorable electronic state of a cation on catalysts was investigated by changing counter anions and/or carriers.

N‐Butyl Pyridinium Diiodido Argentate(I): A One‐Dimensional Ag‐I Network with Superior Solid‐State Ionic Conductivity at Room Temperature

“…Organic–inorganic metal halides are important materials for the next generation optoelectronic applications. [ 1–3 ] Whether the phase is perovskite or non‐perovskite, these materials have been extensively used as light emitting solid state materials, [ 4–8 ] gas sensors, [ 9,10 ] battery electrolytes, [ 11–13 ] for catalysis [ 14,15 ] etc. A further advantage is that many solid ionic conductors can easily be patterned or shaped in device fabrication processes to match certain requirements.…”

“…gas sensors, [9,10] battery electrolytes, [11][12][13] for catalysis [14,15] etc. A further advantage is that many solid ionic conductors can easily be patterned or shaped in device fabrication processes to match certain requirements.…”

Montmorillonites Modified with Carbonaceous Deposits

“…One catalytic reaction in question would be the selective catalytic reduction of nitric oxide with ammonia. Catalysts proposed for this reaction are oxides/hydroxides or salts of vanadium, chromium, copper, iron, or manganese supported on silica-aluminas (or alumina) or active carbons (1)(2)(3)(4)(5). However, in both cases the catalysts show some undesirable characteristics.…”

“…The latter have a large portion of their surface area in barely accessible narrow micropores (diameter 0.7 nm), but can, in contrast to silica-alumina-based catalysts, work at low temperature (ca. 423 K) (5) where no or very little undesirable N 2 O is produced in a side reaction. The formation of a thin stable carbonaceous layer on silica-alumina material (e.g., 1 To whom correspondence should be addressed.…”