Photocatalytic reduction of NO with ethanol on Au/TiO2

Abstract

The effect of illumination on the surface interaction and the reaction between NO + C 2 H 5 OH was investigated on Au/TiO 2 catalyst. By means of Fourier transform infrared spectroscopy, the formation of absorption bands at $2180 and $2210 cm À1 was observed. The first was attributed to the NCO species locating on Au particles, and the second one to NCO residing on the TiO 2 support. While the thermal reaction between NO and C 2 H 5 OH on Au/TiO 2 catalyst occurred with measurable rate only at and above 473-523 K, illumination of the system induced the reaction even at room temperature. A fraction of NO was converted into N 2 O, another one to N 2. At the same time, the photo-induced decomposition of C 2 H 5 OH also occurred yielding CH 3 CHO, H 2 , CO, and CH 4. Interestingly, the presence of NO significantly slowed down the rate of the decomposition of C 2 H 5 OH. Separate studies revealed that all the products formed in the decomposition of C 2 H 5 OH reacted with NO. A mechanism for the photocatalytic reduction of NO with C 2 H 5 OH is proposed taking into account the effects of the products of C 2 H 5 OH photolysis. Incorporation of N into TiO 2 , which significantly lowered its band gap, appreciably enhanced the reduction of NO, which occurred even in visible light.

Production of H 2 in the photocatalytic reactions of ethane on TiO 2 -supported noble metals

“…Photocatalytic reaction was followed in the same way as described in our previous papers [35], equipped with a 500 W medium pressure mercury vapor lamp (TQ 718, Heraeus Noble light, Germany) as a light source. In some experiments we applied a 15 W germicide lamp, which emits predominantly in the wavelength of 250e440 nm, and its maximum intensity is at 254 nm.…”

“…For FTIR studies a mobile IR cell housed in a metal chamber was used [35]. Infrared spectra were recorded with a Biorad (Digilab.…”

Light‐Driven Sustainable Hydrogen Production Utilizing TiO2 Nanostructures: A Review

“…Common and effective route to enhance the spe cific surface is structuring layers with various nanostructures on TiO 2 . [111] Tang Pds/TiO 2 Anatase TiO 2 nanoparticles Successive ionic layer adsorption and reaction method [189] Au/Ag/TiO 2 NWs Commercial anatase TiO 2 particles Hydrothermal and photodeposition [190] g-C 3 N 4 /G/TiO 2 TiO 2 paste Self-assembly photochemical reduction [191] Cds/TiO 2 TiO 2 NWs Successive ionic layer adsorption and reaction method [192] N/TiO 2 NRs TiO 2 NWs Hydrothermal method [193] Cds/TiO 2 FTO-coated glass slides One-step electrodeposition technique [194] CdSe/TiO 2 FTO-coated glass Electrospinning pyrolysis and chemical bath deposition [195] Al(H 2 PO 4 ) 3 /TiO 2 Titanium fluoride Spray method [196] Ag/TiO 2−x FTO substrates Photochemical reduction process and postannealing [197] BiVO 4 /TiO 2−x Al(H 2 PO 4 ) 3 Two-step hydrothermal [198] ZnO/TiO 2 TiO 2−x Sol-gel deposition and hydrothermal [199] RGO/Ag 2 S/TiO 2 TiO 2−x Hydrothermal and ionexchange [200] RGOT aerogel ITO One-step hydrothermal [201] ZnSe/Au/TiO 2 NTs GO Two-step anodization, microwave-assisted chemical reduction and in situ deposition [202] Bi (Figure 10k,l). Still problems like accuracy controlling of the size of particles, connectivity, and distribu tion between the interfaces of NPs and TiO 2 NBs remain set tled.…”

“…Thus, on one hand, it is necessary to create sufficient reactive sites for enlarging the surface area for better photocatalytic efficiency. Common and effective route to enhance the specific surface is structuring layers with various nanostructures on TiO 2 . Tang et al produced a nanoflake–nanoparticle compound hierarchical TiO 2 nanostructure with high photocatalytic performance ( Figure k,l).…”

Catalytic and photocatalytic reactions of H2+CO2 on supported Au catalysts

“…We expect that the Au in nanosize (1-3 nm) deposited on n-type semiconducting oxides might be able to activate the rather inert CO 2 and induces its thermal and photoreactions with H 2 even at low pressure. Recently, it was found the Au/TiO 2 is a very effective catalyst even for the photoinduced reactions of NO + C 2 H 5 OH and in the decomposition of several organic compounds at room temperature [24]. As regards the activation of CO 2 , recently we found that the deposition of K on Au(1 1 1) single crystal leads to the formation of negatively charged CO 2 and its dissociation even above 300 K [25].…”