Pillared montmorillonites modified with silver

Selective reduction of NO with NH3 over pillared clays modified with transition metals

“…The peaks at 26.5 and 28 • are attributed to a presence of quartz (Q) and crystobalite (C) impurities in the clay. The results of XRD measurements as well as their detailed description can be found in a previous paper [5]. Table 2 presents BET surface areas (S BET ) of the parent clay and its modifications.…”

“…Possibility of modification of texture parameters, surface acidity, composition, etc., allows preparing clay-based catalysts for specific applications. It is not therefore surprising that modified PILCs have been found to be active, selective and stable catalysts for reduction of NO x with ammonia and hydrocarbons [3][4][5].…”

Ammonia and water sorption properties of the mineral-layered nanomaterials used as the catalysts for NOx removal from exhaust gases

“…Chmielarz et al [6] have compared the ZrO 2 -, TiO 2 -and Al 2 O 3 -pillared montmorillonite doped with cobalt or copper as active materials. The starting material was the montmorillonite from Wyoming.…”

“…The activity of catalysts increases in the presence of these active materials. One of examples may be a montmorillonite modified by Al 2 O 3 -or a TiO 2 -pillared clay with Cu or Co studied by Chmielarz et al [6]. The best catalyst was the Al 2 O 3 -pillared clay promoted with 18% Co which had 90% NO conversion at the temperature of 750 K. The activity of the SCR for catalysts based on the TiO 2 -pillared montmorillonite was not influenced by the Co amount and all the samples had ca.…”

Thermal stability and pollutant adsorption efficiency of nanocomposites consisted of clay and polymeric quaternary ammonium salts

“…Some ions in both the tetrahedral and octahedral positions are substituted by ions with lower charge, e.g. Si 4+ by [6] or alkylammonium ions [7].…”