Kinetic features of the steady state photocatalytic CO oxidation by air on TiO2

Abstract

The paper reports quantum efficiency dependence of the steady state gas phase photoeatalytic oxidation of CO over dispersed anatase on CO and CO: concentrations, temperature and UV fight intensity. A tentative mechanism of the process is proposed.

Photocatalytic oxidation of methyl formate on TiO2: a transient DRIFTS study

“…Formate oxidizes directly to CO 2 [Reaction (2)], whereas methoxy reacts through formaldehyde and formate intermediates [16,32,[37][38][39][40][41] [Reaction (3)]. Note that O 2 consumption and H 2 O production are not shown in the mechanism below for clarity.…”

“…Photocatalytic oxidation employs UV or near-UV irradiation to oxidize adsorbed organics to CO 2 and H 2 O on semiconductor catalysts, such as titanium dioxide (TiO 2 ). Previous studies have demonstrated that PCO successfully oxidizes many gas-phase organics, but reaction pathways are not fully understood and intermediates are often not identified [1][2][3][4]7,9,11,12].…”

“…Heterogeneous photocatalytic oxidation (PCO) has potential applications for the treatment of waste streams with dilute concentrations of VOCs because it oxidizes a wide range of both liquid-and vapor-phase organics to environmentally benign compounds at room temperature [1][2][3][4][5][6][7][8][9][10][11][12]. Photocatalytic oxidation employs UV or near-UV irradiation to oxidize adsorbed organics to CO 2 and H 2 O on semiconductor catalysts, such as titanium dioxide (TiO 2 ).…”

Regularities of decomposition of organic vapors using a photocatalytic air cleaner

“…(8) Let us introduce designations k 1´ = N 0 k 1 /u and k 2´ = N 0 k 2 /u and rewrite the equations in the final form , (9) . (10) In essence, Eqs (9) and (10) are the material balance of the system with respect to the starting substrate A and intermediate B.…”

Complete oxidation of egg albumin on photoirradiated TiO2: factors determining catalytic performance in solid–solid heterogeneous systems

“…The active oxygen species formed photolytically on the UV-irradiated TiO 2 surface oxidize the pollutants that are adsorbed on the surface. It has been reported that a variety of air pollutants, including CO [6,7], NOx, [8][9][10][11] and volatile organic compounds [12][13][14][15][16], are oxidized to CO 2 on the photoirradiated TiO 2 surface. Recently, PCO has been also used for inactivation of bacteria [17][18][19][20] and viruses [19][20][21][22][23][24], and the efficacy of PCO for reducing antibacterial and antiviral activity has been discussed.…”