Influence of the addition of vanadium to Pt/TiO catalyst on the selective catalytic oxidation of NH to N.

In this work, the effect of the addition of vanadium to the Pt/TiO catalyst on the selective catalytic oxidation (SCO) of NH to N was investigated. It was found that the addition of vanadium significantly enhanced catalytic activity at all tested temperatures. The Pt/V/TiO catalyst exhibited the highest NH conversion (∼100%) and NH to N conversion (∼81%) at 250°C.

Promotional effect of antimony on the selective catalytic reduction NO with NH over V-Sb/Ti catalyst.

The effect of antimony on the selective catalytic reduction (SCR) performance and SO durability of V-Sb/Ti was investigated. The physicochemical characteristics of catalyst were characterized by various techniques, including Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction (XRD), NH/SO-temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), X-ray photoelectron spectroscopy (XPS), and H-temperature programmed reduction (H-TPR). The V-Sb/Ti catalyst showed excellent activity in the range 200-300°C (compared with V/Ti), with an optimum achieved for 2 wt.

Influence of Mn valence state and characteristic of TiO on the performance of Mn-Ti catalysts in ozone decomposition.

The effects of physicochemical properties of Mn-Ti catalysts on O conversion were examined. The catalysts were prepared by a wet impregnation method that gave manganese supported on various commercial sources of TiO. The properties of the catalysts were studied using physicochemical techniques, including Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction (XRD), H temperature-programmed reduction (H-TPR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA).

Effect of the Mn oxidation state and lattice oxygen in Mn-based TiO2 catalysts on the low-temperature selective catalytic reduction of NO by NH3.

Unlabelled: TiO2-supported manganese oxide catalysts formed using different calcination temperatures were prepared by using the wet-impregnation method and were investigated for their activity in the low-temperature selective catalytic reduction (SCR) of NO by NH3 with respect to the Mn valence and lattice oxygen behavior. The surface and bulk properties of these catalysts were examined using Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD). Catalysts prepared using lower calcination temperatures, which contained Mn4+ displayed high SCR activity at low temperatures and possessed several acid sites and active oxygen.

A study on the reaction characteristics of vanadium-impregnated natural manganese oxide in ammonia selective catalytic reduction.

This study investigated the effect of adding vanadium (V) to natural manganese oxide (NMO) in ammonia (NH3) selective catalytic reduction (SCR). The addition of V to NMO decreased the catalytic activity at low temperatures by blocking the active site. However, the enhancement of catalytic activity was achieved by controlling NH3 oxidation at high temperatures.