Synthesis and properties of Pt/TiN catalyst for low-temperature air purification from carbon monoxide

Abstract

Catalysts of carbon monoxide oxidation were synthesized by deposition of platinum on titanium nitride (TiN). Two substrates with an average particle size of 18 and 36 nm were obtained by hydrogen reduction of titanium tetrachloride in a stream of microwave plasma of nitrogen. The surface of the catalysts was studied by X-ray photoelectron spectroscopy (XPS). The data obtained by us in the present work indicate the presence of oxynitride as a transition layer between nitride and oxide. It was found that the CO oxidation rate on the 9–15 wt. % Pt loaded TiN catalysts is 120 times higher than that on the platinum black with a specific surface of 30 m2g–1. Increase in the reaction rate of CO oxidation on Pt/TiN catalysts as compared to platinum black can be associated with both an increase in the concentration of CO molecules adsorbed and a decrease in the activation energy of the reaction. Catalysts are promising for use in catalytic air purification systems.

Vacancy Rich TiB2 Nanosheets Promote Electrochemical Ammonia Synthesis

“…The peak at 399.8 eV corresponds to oxynitrides of titanium, and the peak at 400.6 eV corresponds to molecular N 2 . 36 Specifically, as reported by Geagea et al recently, this peak corresponds to partially dissociated N 2 molecules chemisorbed on TiB 2 nanosheet surface. 37 These results indicate that N 2 present in the nanosheets is chemically adsorbed.…”

“… ,, The presence of these B–N and Ti–N bonds is also reflected in N1s spectra at 398.0 and 395.7 eV, respectively. The peak at 399.8 eV corresponds to oxynitrides of titanium, and the peak at 400.6 eV corresponds to molecular N 2 . Specifically, as reported by Geagea et al recently, this peak corresponds to partially dissociated N 2 molecules chemisorbed on TiB 2 nanosheet surface .…”

Nanoparticulate TiN Loading to Promote Z‐Scheme Water Splitting Using a Narrow‐Bandgap Nonoxide‐Based Photocatalyst Sheet

“…The appearance of a peak at 396.7 eV associated with a somewhat smaller formal charge was also ascribed to the formation of TiN. [ 27 ] The presence of a TiN phase was also inferred from an XRD analysis of the Ti precursor powder following nitridation under the same conditions (Figure S5a, Supporting Information). This TiN phase was generated by nitriding the as‐impregnated amorphous Ti precursor at 873 K. An anatase phase produced by crystallization without nitridation was also observed because a large amount of the Ti precursor powder was nitrided to allow for the acquisition of XRD patterns.…”

“…These new peaks are attributable to TiO x N y and TiN, respectively, and indicate the formation of Ti─N bonds. [ 27 ] Concurrently, in the O 1s spectra, the peak at 532.5 eV assigned to surface hydroxyls was reduced in intensity whereas an increase in the N 1s peak at approximately 396.0 eV was observed. The appearance of a peak at 396.7 eV associated with a somewhat smaller formal charge was also ascribed to the formation of TiN.…”