Electrochemical promotion of NO reduction by C2H4 in 10% O2 using a monolithic electropromoted reactor with Rh/YSZ/Pt elements

Abstract

The reduction of NO by C 2 H 4 in high excess of O 2 and temperatures 200-300°C was investigated using a monolithic electropromoted reactor (MEPR) with twentytwo Rh/YSZ/Pt parallel plate elements. It was found that at 220-240°C and 10% O 2 the selective catalytic reduction (SCR) of NO can be electropromoted by 450% with near 100% selectivity to N 2 and K NO values up to 2.4. The corresponding rate enhancement ratio of complete C 2 H 4 oxidation is up to 900% with Faradaic efficiency, K CO 2 , values up to 350. The system appears promising for practical applications.

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

“…This phenomenon has been applied to numerous catalytic systems, 2 including treatment of automotive exhaust and oxidation of volatile organic compounds (VOCs). [5][6][7][8] Yttria-stabilized zirconia (YSZ) is one of the most studied solid electrolytes in EPOC catalytic systems and is known to be an O 2− conductor due to the presence of oxygen vacancies inside its crystallographic structure. Recently, it was found that EPOC effect, e.g.…”

Recent developments and trends in the electrochemical promotion of catalysis (EPOC)

“…In a very recent report [89] the reaction of NO by [89] is 0.08% and lamda value k (expresses the O 2 /fuel ratio present in automotive exhaust) is 1.12. Upon positive current imposition (?30 mA, e.g.…”

“…Many studies have already been published [86][87][88][89][90] after the first report of MEPR [86] showing its advantages for several reaction (oxidations, reductions, hydrogenations etc.). In a very recent report [89] the reaction of NO by [89] is 0.08% and lamda value k (expresses the O 2 /fuel ratio present in automotive exhaust) is 1.12.…”

Electrochemical activation of an oblique angle deposited Cu catalyst film for H2 production

“…1 Hence, while the conventional catalytic promotion is carried out by adding a specific amount of a promoter during the preparation step of the catalyst, in the case of the electrochemical promotion, the electrically induced back-spillover of the promoter species enables the in situ control and enhancement of the catalytic performance of the catalyst film during the reaction step. [4][5][6][7][8] Several EPOC studies have also dealt with the improvement of catalytic materials and the development of electrodes consisting of catalysts highly dispersed on gold, 9 mixed ionic electronic conductors, 10 carbonous materials [11][12][13] and yttria-stabilized zirconia (YSZ), [14][15][16][17] or catalysts based on non-noble (lower cost) metals such as Ni, 11,[18][19][20][21] Fe 4,22,23 and Cu. 3 Nowadays, some of the main challenges of EPOC for further technological progress are the design of scaled-up reactors and material cost minimization.…”

“…Different techniques have been used in EPOC studies for the preparation of the active catalyst film such as deposition and calcination of an organometallic paste, 4,17,20,22 impregnation of a metal precursor solution, 9,10,18 spray deposition in a carbon matrix 12 and other less conventional techniques which enable a better control of the microstructure of the film, including Physical Vapour Deposition (PVD) methods such as sputtering, [5][6][7]14,24,25 Cathodic Arc Deposition (CAD) 13 and Pulsed Laser Deposition (PLD). Different techniques have been used in EPOC studies for the preparation of the active catalyst film such as deposition and calcination of an organometallic paste, 4,17,20,22 impregnation of a metal precursor solution, 9,10,18 spray deposition in a carbon matrix 12 and other less conventional techniques which enable a better control of the microstructure of the film, including Physical Vapour Deposition (PVD) methods such as sputtering, [5][6][7]14,24,25 Cathodic Arc Deposition (CAD) 13 and Pulsed Laser Deposition (PLD).…”