The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform
Dengwei Jing - One of the best experts on this subject based on the ideXlab platform.
-
Photodecomposition of nox on ag tio2 composite catalysts in a gas phase reactor
Chemical Engineering Journal, 2017Co-Authors: Mengxi Xu, Yunhai Wang, Jiafeng Geng, Dengwei JingAbstract:Abstract With NO as model gas component, photocatalytic NOx decomposition under UV and visible light irradiation has been investigated in a gas phase photocatalytic reactor over anatase TiO2 and Ag/TiO2, respectively. TiO2 and Ag/TiO2 were prepared by a solvothermal method and characterized by X-ray diffraction (XRD), BET, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) etc. The activity of the photocatalysts was evaluated by decomposition rate of NO and yield of N2, respectively. It was found that although Photodecomposition of NO over pure TiO2 is very quick, NO has not been converted into N2 and O2. It means that some by-products have formed. N2 formation is a relatively slower process. It was found that the selectivity for Photodecomposition of NOx into N2 can be significantly improved by introducing appropriate amount of Ag into TiO2. The 1 wt% Ag loaded on TiO2 showed the highest activity for both NO decomposition and N2 production. The possible mechanism for the enhancement of photocatalytic activity of anatase Ag/TiO2 was attributed to the coexistence of Ag0 and Ag+ on the surface of TiO2, with a Ag+/Ag ratio of ca. 0.86, which played different roles in the photocatalytic process. Our study could be valuable for the development of efficient photocatalyst for NOx Photodecomposition with a high selectivity.
Masao Kaneko - One of the best experts on this subject based on the ideXlab platform.
-
direct electrical power generation from urine wastes and biomass with simultaneous Photodecomposition and cleaning
Biosensors and Bioelectronics, 2007Co-Authors: Masao Kaneko, Hirohito Ueno, Keita Ohnuki, Mizuki Horikawa, Rie Saito, Junichi NemotoAbstract:Abstract Electric power was for the first time generated directly from urine, wastes, and biomass with simultaneous Photodecomposition and cleaning by using a biophotofuel cell (BPFC) composed of a nanoporous TiO 2 film semiconductor photoanode and an O 2 -reducing cathode. Human urine exhibited a PFC characteristics with J sc 0.086 mA cm −2 , V oc 0.56 V, and fill factor (FF) 0.50 under irradiation by a solar simulator with AM 1.5 G and 100 mW cm −2 incident light intensity. Both the soluble and residual parts of waste paper partially solubilized by a H 3 PO 4 aqueous solution were also photodecomposed with simultaneous electrical power generation. As trials of various biomass materials, Coca-Cola (to test colored sample), Japanese rice wine (to test alcohol aqueous solution), and grated radish (to test slurry state sample) also generated effectively electrical power during Photodecomposition by a solar simulator.
-
Photodecomposition of ammonia to dinitrogen and dihydrogen on platinized tio2 nanoparticules in an aqueous solution
Journal of Photochemistry and Photobiology A-chemistry, 2007Co-Authors: Junichi Nemoto, Norihiko Gokan, Hirohito Ueno, Masao KanekoAbstract:Abstract By using suspended platinized titanium dioxide (Pt-TiO2) as a photocatalyst in an NH3 aqueous solution, NH3 was photodecomposed into H2 and N2. The amount of loaded Pt was changed between 0 and 2.0 wt% and the reaction was conducted under irradiation in an Ar atmosphere. In the Pt loading between 0 and 0.5 wt% the H2 and N2 evolution increased linearly with the Pt amount and the H2/N2 molar ratio was about 3:1. The evolution of H2 and N2 reached a maximum at 0.5 wt% Pt, and then decreased probably due to a filter effect by the Pt. The effect of pH on the Photodecomposition of NH3 in the presence of Pt-TiO2 under Ar was investigated at pH from 0.68 to 13.7. The evolution of H2 increased steeply at the pH from 9 to 10 showing that the dissociation of NH4+ to free NH3 is important for the Photodecomposition (pKa of NH4+/NH3 is 9.24). The time-course of H2 and N2 evolution in a 59 mM NH3 aqueous solution during 53 h irradiation gave the Photodecomposition yield of 21.6%. The effect of RuO2 loading as a co-catalyst for the TiO2 or Pt-TiO2 was investigated showing that the RuO2 does not work as a H+ reduction catalyst. The activity of SrTiO3 used instead of TiO2 was only small, and the H2/N2 ratio (0.64) was very small showing that the Pt-SrTiO3 is not a good photocatalyst to decompose NH3. A TiO2/FTO nanoporous film photoanode was used in combination with a Pt counter electrode instead of the Pt-TiO2 photocatalyst, leading also to Photodecomposition of NH3 to produce H2 and N2 at 3:1 ratio.
Junichi Nemoto - One of the best experts on this subject based on the ideXlab platform.
-
direct electrical power generation from urine wastes and biomass with simultaneous Photodecomposition and cleaning
Biosensors and Bioelectronics, 2007Co-Authors: Masao Kaneko, Hirohito Ueno, Keita Ohnuki, Mizuki Horikawa, Rie Saito, Junichi NemotoAbstract:Abstract Electric power was for the first time generated directly from urine, wastes, and biomass with simultaneous Photodecomposition and cleaning by using a biophotofuel cell (BPFC) composed of a nanoporous TiO 2 film semiconductor photoanode and an O 2 -reducing cathode. Human urine exhibited a PFC characteristics with J sc 0.086 mA cm −2 , V oc 0.56 V, and fill factor (FF) 0.50 under irradiation by a solar simulator with AM 1.5 G and 100 mW cm −2 incident light intensity. Both the soluble and residual parts of waste paper partially solubilized by a H 3 PO 4 aqueous solution were also photodecomposed with simultaneous electrical power generation. As trials of various biomass materials, Coca-Cola (to test colored sample), Japanese rice wine (to test alcohol aqueous solution), and grated radish (to test slurry state sample) also generated effectively electrical power during Photodecomposition by a solar simulator.
-
Photodecomposition of ammonia to dinitrogen and dihydrogen on platinized tio2 nanoparticules in an aqueous solution
Journal of Photochemistry and Photobiology A-chemistry, 2007Co-Authors: Junichi Nemoto, Norihiko Gokan, Hirohito Ueno, Masao KanekoAbstract:Abstract By using suspended platinized titanium dioxide (Pt-TiO2) as a photocatalyst in an NH3 aqueous solution, NH3 was photodecomposed into H2 and N2. The amount of loaded Pt was changed between 0 and 2.0 wt% and the reaction was conducted under irradiation in an Ar atmosphere. In the Pt loading between 0 and 0.5 wt% the H2 and N2 evolution increased linearly with the Pt amount and the H2/N2 molar ratio was about 3:1. The evolution of H2 and N2 reached a maximum at 0.5 wt% Pt, and then decreased probably due to a filter effect by the Pt. The effect of pH on the Photodecomposition of NH3 in the presence of Pt-TiO2 under Ar was investigated at pH from 0.68 to 13.7. The evolution of H2 increased steeply at the pH from 9 to 10 showing that the dissociation of NH4+ to free NH3 is important for the Photodecomposition (pKa of NH4+/NH3 is 9.24). The time-course of H2 and N2 evolution in a 59 mM NH3 aqueous solution during 53 h irradiation gave the Photodecomposition yield of 21.6%. The effect of RuO2 loading as a co-catalyst for the TiO2 or Pt-TiO2 was investigated showing that the RuO2 does not work as a H+ reduction catalyst. The activity of SrTiO3 used instead of TiO2 was only small, and the H2/N2 ratio (0.64) was very small showing that the Pt-SrTiO3 is not a good photocatalyst to decompose NH3. A TiO2/FTO nanoporous film photoanode was used in combination with a Pt counter electrode instead of the Pt-TiO2 photocatalyst, leading also to Photodecomposition of NH3 to produce H2 and N2 at 3:1 ratio.
Teruo Hori - One of the best experts on this subject based on the ideXlab platform.
-
phase selectivity photocatalysis a new approach in organic pollutants Photodecomposition by nanovoid core tio2 shell sio2 nanoparticles
Chemical Communications, 2008Co-Authors: Sheng Wang, Tao Wang, Wenxing Chen, Teruo HoriAbstract:Core(TiO2)/shell(SiO2) nanoparticles, with a void layer between the TiO2 core and the silica layer, act as phase-selectivity photocatalysts for the Photodecomposition of organic pollutants (gas phase) without any damage to their organic supports (solid phase).
Mengxi Xu - One of the best experts on this subject based on the ideXlab platform.
-
Photodecomposition of nox on ag tio2 composite catalysts in a gas phase reactor
Chemical Engineering Journal, 2017Co-Authors: Mengxi Xu, Yunhai Wang, Jiafeng Geng, Dengwei JingAbstract:Abstract With NO as model gas component, photocatalytic NOx decomposition under UV and visible light irradiation has been investigated in a gas phase photocatalytic reactor over anatase TiO2 and Ag/TiO2, respectively. TiO2 and Ag/TiO2 were prepared by a solvothermal method and characterized by X-ray diffraction (XRD), BET, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) etc. The activity of the photocatalysts was evaluated by decomposition rate of NO and yield of N2, respectively. It was found that although Photodecomposition of NO over pure TiO2 is very quick, NO has not been converted into N2 and O2. It means that some by-products have formed. N2 formation is a relatively slower process. It was found that the selectivity for Photodecomposition of NOx into N2 can be significantly improved by introducing appropriate amount of Ag into TiO2. The 1 wt% Ag loaded on TiO2 showed the highest activity for both NO decomposition and N2 production. The possible mechanism for the enhancement of photocatalytic activity of anatase Ag/TiO2 was attributed to the coexistence of Ag0 and Ag+ on the surface of TiO2, with a Ag+/Ag ratio of ca. 0.86, which played different roles in the photocatalytic process. Our study could be valuable for the development of efficient photocatalyst for NOx Photodecomposition with a high selectivity.
