Selective catalytic reduction of NO with NH₃ on mixed alumina–iron (III) oxide pillared montmorillonite “Cheto” Arizona, modified with hexamminecobalt (III) chloride

Abstract

Montmorillonite intercalated with mixed alumina-iron (III) oxide pillars and promoted with hexamminecobalt (III) chloride was studied in selective catalytic reduction of NO with NH 3 . Pillaring process extended the interlayer spacing by 0.236 nm and increased specific surface area (SSA BET , without pillaring, showed no selective catalytic reduction activity, but still produced high amounts of N 2 O.

Modified Layered Silicas as Catalysts for Conversion of Nitrogen Pollutants in Flue Gases—A Review

“…Moreover, the ion exchange properties of PCHs, which depend mainly on the clay minerals used for their synthesis, favor the introduction of catalytically active metal species in highly dispersed forms. These very promising properties of PCHs have sparked great interest in these materials as potential catalysts for various processes, including selective catalytic reduction of NO with ammonia (NH 3 -SCR) [13,15,30] and selective catalytic oxidation of ammonia (NH 3 -SCO) [67]. Chmielarz et al [72] reported promising results for the NH 3 -SCR process for PCHs obtained from synthetic saponite intercalated with silica pillars and modified with copper and iron via the ion exchange method.…”

“…The porous clay heterostructure (PCH) obtained through intercalation of synthetic saponite with silica pillars was used as the catalytic support for the preparation of the NH 3 -SCO catalysts [67]. Copper and iron were deposited into the PCH support via ion exchange method in the form of highly dispersed species, namely monomeric cations and small oligomeric metal oxide aggregates.…”

“…The catalysts based on aluminaintercalated vermiculite were more active, especially at lower temperatures, however in this case intensive ammonia oxidation above 400 • C also significantly decreased the efficiency of the NH 3 -SCR process [66]. On the other hand, Ziemniński et al [67] studied montmorillonite intercalated with mixed iron-alumina pillars (Fe-Al-PILCs) as NH 3 -SCR catalysts. In this case, the NO conversion started above 200 • C and the level of 90% was obtained at about 350 • C. The drawback of the rection conducted in the presence of these catalysts was the relatively high production of N 2 O, which is the main side product of the NH 3 -SCR process.…”

SO2 Poisoning and Recovery of Copper-Based Activated Carbon Catalysts for Selective Catalytic Reduction of NO with NH3 at Low Temperature

“…The special attention of many researchers has been recently directed to the application of modified activated carbon (AC) as NH 3 -SCR catalysts [22][23][24][25]. This is mainly due to its high specific surface area, well-developed system of pores, and hydrothermal durability [26,27]. The positive influence of activated carbon used as a catalyst support for the simultaneous removal of both NO x and SO 2 was confirmed by many researchers [28,29].…”

The application of modified cenospheres in DeNOx process

“…Numerous systems have been proposed as catalyst carriers, e.g. activated carbons [8][9][10][11][12][13][14][15][16][17], aluminosilicates [18][19][20][21][22], zeolites [23][24][25][26], hydrotalcites [27][28][29], etc. Most often, delectron metals, such as Fe [20,22,[30][31][32][33], Cu [5,18,[34][35][36][37][38], Mn [8,[39][40][41][42][43], etc.…”