TY - JOUR
T1 - Electro-reduction of NOx-species in alkaline medium at modified carbon-supported palladium nanoparticles with variable concentration of C-sp2
T2 - An in-situ mass-spectrometry approach
AU - Vázquez-Bautista, S.
AU - Ramírez-Meneses, E.
AU - Manzo-Robledo, A.
AU - Zacahua-Tlacuatl, G.
AU - Lartundo-Rojas, L.
AU - Acosta-Jara, J.
AU - Pedraza-Segura, L. L.
AU - Luna-Trujillo, M.
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1
Y1 - 2023/1
N2 - Electrochemical denitrification is a promising technology for removing NOx species due to its environmental impact. In this work, nanostructured palladium electrocatalysts (3.2–3.7 nm) stabilized with different compounds namely lignin, oleylamine, octylamine, and 2-methyl-2butanol supported on Vulcan carbon were synthesized from organometallic precursors for the electrocatalytic reduction of nitrated species. For this purpose, electrochemical techniques such as cyclic voltammetry at different concentrations of NaNO2 and NaNO3 (saturated with NO2 gas, synthesized in situ) in the alkaline medium were carried out. The current versus potential characteristic (i-E) showed that the as-synthesized Pd/lignin/C catalyst exhibited the highest activity in the reduction of NO2− and NO3−, with hydrogen production at more negative potentials, as demonstrated by differential electrochemical mass spectroscopy (DEMS). Additionally, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicate the presence of metallic palladium and other PdyOx species well distributed on the carbon support matrix promoting different interfacial redox processes depending on the stabilizer in turn and the carbon hybridization namely, D-parameter (D = sp2/sp3).
AB - Electrochemical denitrification is a promising technology for removing NOx species due to its environmental impact. In this work, nanostructured palladium electrocatalysts (3.2–3.7 nm) stabilized with different compounds namely lignin, oleylamine, octylamine, and 2-methyl-2butanol supported on Vulcan carbon were synthesized from organometallic precursors for the electrocatalytic reduction of nitrated species. For this purpose, electrochemical techniques such as cyclic voltammetry at different concentrations of NaNO2 and NaNO3 (saturated with NO2 gas, synthesized in situ) in the alkaline medium were carried out. The current versus potential characteristic (i-E) showed that the as-synthesized Pd/lignin/C catalyst exhibited the highest activity in the reduction of NO2− and NO3−, with hydrogen production at more negative potentials, as demonstrated by differential electrochemical mass spectroscopy (DEMS). Additionally, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicate the presence of metallic palladium and other PdyOx species well distributed on the carbon support matrix promoting different interfacial redox processes depending on the stabilizer in turn and the carbon hybridization namely, D-parameter (D = sp2/sp3).
KW - DEMS
KW - NO-pollution
KW - Palladium nanoparticles
KW - lignin
KW - synthesis
UR - http://www.scopus.com/inward/record.url?scp=85138133485&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2022.121984
DO - 10.1016/j.apcatb.2022.121984
M3 - Artículo
AN - SCOPUS:85138133485
SN - 0926-3373
VL - 320
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121984
ER -