Catalytic reduction of nitrate and nitrite with mono- and bimetallic catalysts supported on pillared clays

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

“…Ru[3,4,56,67]. When palladium and platinum were compared to each other as the noble metal component in bimetallic catalysts, similar values of N 2 selectivity were found.However, much higher activity for nitrate reduction was achieved using Pd-based catalysts[3,4,[88][89][90].…”

Tin-palladium supported on alumina as a highly active and selective catalyst for hydrogenation of nitrate in actual groundwater polluted with nitrate

“…Among Pd-based bimetallic catalysts, Cu-Pd ones have been the most extensively studied because of their high activity and selectivity. [6][7][8][9][10][11][12][13][14][15][16][17][18]23,24,[27][28][29][30][31][32][33][34] In most studies on Cu-Pd catalysts, the catalytic performances were evaluated in distilled or deionized water, in which nitrate (MNO3, M = Na or K) was dissolved, and some Evaluation of the catalytic performances in groundwater is a necessary consideration for practical applications of this catalytic purification technology because coexisting matter in groundwater, including cations, anions, and water-soluble organic compounds, affects the catalytic performance. In some studies, Cu-Pd catalysts have been used for the reaction in actual groundwater, natural water and tap water samples.…”

“…32 Sulfate ion and its reduced products, including SO3 2and HS -, formed under the reaction conditions, greatly decrease the reaction rate for NO3reduction over supported Cu-Pd catalysts. 32,37 Pd-based bimetallic catalysts, other than Cu-Pd, including Sn-Pd [19][20][21][22][23][24][27][28][29]34,35 and In-Pd [24][25][26][27][28]34 show activity towards the hydrogenation of NO3 -. The base metal sites in these catalysts have different affinities for coexisting ions in water from those of the Cu sites in Cu-Pd catalysts, and thus, the catalysts have strong potential to deliver superior performance in groundwater than Cu-Pd catalysts do.…”

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

“…It is noteworthy that, in previously reported studies [ 45 , 46 , 47 ], monometallic catalysts were found to be inactive for nitrate ( ) reduction and addition of co-metals, such as In, Cu and Sn are typically required to reduce the nitrate in an aqueous phase. However, Huo et al [ 48 ] showed that reduction of aqueous nitrate ( was possible by using monometallic Ru/C catalyst at controlled pH condition (pH 5.0).…”