Oxygen reduction reaction

Xem 1-4 trên 4 kết quả Oxygen reduction reaction

Electrochemical activity of PtM (M=Co, Cu, Ni) catalysts supported on carbon vulcan for oxygen reduction reaction (ORR) in fuel cells

In this work, nanoscale bimetallic PtNi, PtCo, PtCu catalysts on carbon Vulcan XC72R as supports were synthesized by reduction method under ultrasonic irradiation. The morphology, structure and specific area of synthesized materials were characterized by X-Ray diffraction (XRD), transmission electron microscopy (TEM). The catalytic activity for oxygen reduction reaction (ORR) of PtM/C was investigated by CV and linear sweep voltammetry (LSV) under simulated fuel cell working conditions.

8p abcxyz123_02 03-03-2020 9 1 Download

Vai trò của C3H6 hấp phụ bất thuận nghịch với hoạt tính khử NOx bởi C3H6 khi có mặt oxi trên xúc tác Cu/ZSM-5

The results of the reaction of selective reduction of NOx by C3H6 on the catalyst Cu/ZSM-5 with the presence of oxygen shown that there was a monotone relation between conversion degree of NOx and the amount of chemically adsorbed NOx [1]. Besides, the existence of amount of irreversiblely adsorbed C3H6 (C3H6ir) on the surface of catalyst Cu/ZSM-5 was detected [2]. The results of the role of C3H6irr towards reduction activity NOx in the studied reaction is presented in this article.

4p uocvong04 24-09-2015 26 3 Download

Báo cáo khoa học: Oxygen control of nif gene expression in Klebsiella pneumoniae depends on NifL reduction at the cytoplasmic membrane by electrons derived from the reduced quinone pool

In Klebsiella pneumoniae, the flavoprotein, NifL regulates NifA mediated transcriptional activation of the N2-fixation (nif) genes in response tomolecular O2and ammonium.We investigated the influence of membrane-bound oxidoreduc-tases on nif-regulation by biochemical analysis of purified NifLandbymonitoringNifA-mediated expressionofnifH¢-¢lacZ reporter fusions in different mutant backgrounds. NifL-bound FAD-cofactor was reduced by NADH only in the presence of a redox-mediator or inside-out vesicles derived from anaerobically grown K.pneumoniaecells,...

12p tumor12 20-04-2013 33 4 Download
Báo cáo khoa học: Critical role of His369 in the reactivity of Pseudomonas aeruginosa cytochrome cd1 nitrite reductase with oxygen

In the denitrification pathway, Pseudomonas aeruginosacytochrome cd1 nitrite reductase catalyzes the reduction of nitrite to nitric oxide;in vitro, this enzyme is also competent in the reduction of O2 to 2H2 O. In this art-icle, we present a comparative kinetic study of the O2 reaction in the wild-type nitrite reductase and in three site-directed mutants (Tyr10fiPhe, His369fiAla and His327fiAla⁄His369fiAla) of the amino acid resi-dues close to thed1 heme on the distal side.

9p inspiron33 25-03-2013 34 5 Download