Low-temperature Oxidation of Carbon Monoxide on Co/ZrO2

Abstract

A 10%Co/ZrO 2 catalyst prepared by impregnation was tested for its activity for the oxidation of CO to CO 2 in excess oxygen. Activity tests showed that conversion could be obtained at temperatures as low as 20°C. Timeon-stream studies showed no loss of activity in these experiments, indicating that this catalyst is stable in the experimental oxidizing conditions. The activation energy for the CO to CO 2 oxidation reaction was calculated as E a = 54 kJ/mol over this catalyst. Characterization of the material by thermogravimetric analysis, temperature-programmed techniques, X-ray photoelectron spectroscopy, and laser Raman spectroscopy indicate that Co 3 O 4 is present on monoclinic ZrO 2 after the calcination of the catalyst.

Structure and composition of the surface layer of Zr-containing fiberglass materials

“…For zirconium silicate, the binding energies mentioned in the literature are similar: 183.0-183.3 eV [36,39]. For stoichiometric ZrO 2 , the typical values of the Zr3d 5/2 binding energies are considerably smaller and are in the range of 181.6-182.2 eV [36,[39][40][41][42][43][44]. The high-dispersed particles of ZrO 2 with the sizes ranging from 6 to 100 nm are characterized by even lower Zr3d 5/2 binding energies in the range from 180.8 to 181.7 eV, and the binding energy increases with an increase in the particle size [40].…”

Catalytic oxidation of low-concentration CO at ambient temperature over supported Pd‒Cu catalysts

“…[3][4][5][6] Some mixed oxides such as Fe−Co, Cu−Zn, Cu−Mn and Zn−Co also displayed high activity for CO oxidation at low temperatures. [7][8][9][10] Noble metals (such as Au, Ag and Pd catalysts) showed superior activity compared with the transition metal oxides. [11][12][13][14] However, the high cost price and the unstable performance with the time on stream, especially at conditions of moisture and high space velocity, [15,16] limit their wide industrial applications.…”

Selective Catalytic Reduction of NO With NH3 over High Purity Palygorskite-supported MnO2 with Different Crystal Structures

“…Nitrogen oxides (NO x ) can result in acid rain, photochemical smog and ozone depletion, it has become a global environmental concern question (Yung et al, 2007;Liu et al, 2015a;Yu et al, 2015). NH 3 -SCR is the most commonly used and effective denitration technology in modern thermal power plants, accounting for about 95% of the worldwide flue gas denitration devices, with NO conversion reaching over 90% (Pappas et al, 2016;Boningari et al, 2018;Wang et al, 2019a).…”