La-doped Al2O3 supported Au nanoparticles: highly active and selective catalysts for PROX under PEMFC operation conditions

2014 ◽  
Vol 50 (21) ◽  
pp. 2721-2724 ◽  
Author(s):  
Qingquan Lin ◽  
Botao Qiao ◽  
Yanqiang Huang ◽  
Lin Li ◽  
Jian Lin ◽  
...  
Keyword(s):  
High Activity ◽  
Au Nanoparticles ◽  
Co Adsorption ◽  
Operation Conditions ◽  
Highly Active ◽  
La Doped

LaAlO3-doped γ-Al2O3 supported Au catalysts show high activity and selectivity by strengthening CO adsorption meanwhile significantly decreasing H2 oxidation.

scholarly journals CO oxidation over Pt-modified CuO catalysts in the presence of water vapour and SO2

2015 ◽  
Vol 18 (2) ◽  
pp. 187-196
Author(s):  
Tri Nguyen ◽  
Anh Cam Ha ◽  
Loc Cam Luu ◽  
Cuong Tien Hoang ◽  
Thi Thi Yen Trinh ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Water Vapour ◽  
Co Adsorption ◽  
X Ray Diffraction ◽  
Active Centers ◽  
Highly Active ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Adsorption Of Co ◽  
Temperature Programmed

The optimal Pt-modified CuO supported on γ-Al2O3 and γ-Al2O3 + CeO2 catalysts have been prepared. Physico-chemical characteristics of catalysts were investigated and determined by the methods of N2 adsorption (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and hydrogen pulse chemisorption (HPC). The characteristics of carbon monoxide (CO) adsorption on catalysts were defined by the method of infrared spectroscopy (IR) in the range of 4000 – 400 cm-1. The effect of the mixture of water vapour and SO2 on the activity of these catalysts for the CO oxidation was assessed. Reactions were conducted at 200oC and 350oC in the absence and presence of the mixture of water vapour (1.1 mol %) and SO2 (0.0625 mol %). Concentrations of O2 and CO in the gas mixture were 9.2 mol % and 0.5 mol %, respectively. The results showed that in the catalysts there exist highly active centers Cu1+ and Pt2+. On the catalysts the adsorption of CO on Cu2+, Pt2+, CeO2, and γ - Al2O3 centres was observed. Addition of CeO2 led to increase the reductivity, CO adsorption but decrease in specific surface area of catalyst. The result PtCu/CeAl catalyst shown higher active, but lower stability compared to PtCu/Al catalyst. The mixture of water vapour and SO2 showed the reversible poisoning toward the Pt-CuO catalysts at a temperature of 350oC, but irreversible at 200oC

scholarly journals CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1028
Author(s):  
Núria J. Divins ◽  
Eduardo López ◽  
Inmaculada Angurell ◽  
Stefan Neuberg ◽  
Ralf Zapf ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Au Nanoparticles ◽  
Gold Catalyst ◽  
Space Velocity ◽  
Ex Situ ◽  
Oxidation Reactions ◽  
Preferential Oxidation ◽  
Au Nps ◽  
Tio2 Anatase ◽  
Operation Conditions

CO preferential oxidation (PROX) is an effective method to clean reformate H2 streams to feed low-temperature fuel cells. In this work, the PROX and CO oxidation reactions were studied on preformed Au nanoparticles (NPs) supported on TiO2 anatase. Preformed Au NPs were obtained from gold cores stabilized by dodecanethiols or trimethylsilane-dendrons. A well-controlled size of ca. 2.6 nm and narrow size distributions were achieved by this procedure. The catalysts were characterized by high-resolution transmission electron microscopy and ex situ and in situ X-ray photoelectron spectroscopy (XPS). The XPS results showed that the preformed Au NPs exhibited high thermal stability. The different ligand-derived Au catalysts, as well as a conventional gold catalyst for comparison purposes, were loaded onto cordierite supports with 400 cells per square inch. The activity and selectivity of the samples were evaluated for various operation conditions. The catalyst prepared using dodecanethiol-capped Au NPs showed the best performance. In fact, CO conversions of up to 70% at 40% CO2 selectivity and 90% O2 conversion were observed operating at 363 K in H2-rich atmospheres. The performance of the best catalysts was subsequently tested on stainless steel microreactors. A 500-hour stability test was carried out under a real post-reformate stream, including 18 vol.% CO2 and 29 vol.% H2O. A mean CO conversion of ca. 24% was measured for the whole test operating at 453 K and a gas hourly space velocity (GHSV) of 1.3 × 104 h−1. These results reveal our dodecanethiol- and carbosilane-derived Au catalysts as extremely promising candidates to conduct a PROX reaction while avoiding deactivation, which is one of the major drawbacks of Au/TiO2 catalysts.

Plasmonic Au nanoparticles embedding enhances the activity and stability of CdS for photocatalytic hydrogen evolution

2016 ◽  
Vol 52 (11) ◽  
pp. 2394-2397 ◽  
Author(s):  
Guiyang Yu ◽  
Xiang Wang ◽  
Jungang Cao ◽  
Shujie Wu ◽  
Wenfu Yan ◽  
...  
Keyword(s):  
Visible Light ◽  
Full Advantage ◽  
High Activity ◽  
Hydrogen Evolution ◽  
Electromagnetic Fields ◽  
Composite Structure ◽  
Au Nanoparticles ◽  
Light Illumination ◽  
Photocatalytic Hydrogen Evolution ◽  
Visible Light Illumination

A semiconductor fabricated by embedding plasmonic Au nanoparticles into CdS exhibits a high activity and stability for photocatalytic H2evolution. This composite structure could take full advantage of electromagnetic fields at the surface of the Au nanoparticles under visible light illumination.

Synthesis and investigation of a high-activity catalyst: Au nanoparticles modified metalic Ti microrods for NaBH4 electrooxidation

2018 ◽  
Vol 43 (7) ◽  
pp. 3688-3696 ◽  
Author(s):  
Congying Song ◽  
Biaopeng Li ◽  
Kui Cheng ◽  
Ke Ye ◽  
Kai Zhu ◽  
...  
Keyword(s):  
High Activity ◽  
Au Nanoparticles ◽  
Activity Catalyst

scholarly journals Highly active catalysts of iron-based materials with Au nanoparticles for soot oxidation

2019 ◽  
Vol 136 ◽  
pp. 06029
Author(s):  
Chao Wei ◽  
Zhenzhen Chen ◽  
Chao Hu ◽  
Haitao Wang
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Transition Metal ◽  
Metal Oxide ◽  
Au Nanoparticles ◽  
Soot Oxidation ◽  
Transition Metal Oxide ◽  
Initial Oxidation ◽  
Highly Active ◽  
Iron Based

Gold nanoparticles supported on transition metal oxide catalysts have been prepared by deposition-precipitation. Their catalytic activity with or without Au doped has been tested for soot oxidation. Au improves the catalytic activity of transition metal oxide for the oxidation of soot particles. Under the catalysis of Au/Co3O4, the initial oxidation temperature of soot is 354 ℃.

Limiting factors for photochemical charge separation in BiVO4/Co3O4, a highly active photocatalyst for water oxidation in sunlight

2014 ◽  
Vol 2 (24) ◽  
pp. 9405-9411 ◽  
Author(s):  
Jiarui Wang ◽  
Frank E. Osterloh
Keyword(s):  
High Activity ◽  
Water Oxidation ◽  
Charge Separation ◽  
Limiting Factors ◽  
Electrocatalytic Properties ◽  
Highly Active

The high activity of BiVO4/Co3O4 was attributed to the electrocatalytic properties of the Co3O4 cocatalyst and to the formation of a heterojunction at the BiVO4–Co3O4 interface.

scholarly journals Cu nanoparticles immobilized on montmorillonite by biquaternary ammonium salts: a highly active and stable heterogeneous catalyst for cascade sequence to indole-2-carboxylic esters

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13754-13759 ◽  
Author(s):  
Wencheng Lang ◽  
Qin Yang ◽  
Xueping Song ◽  
Mengyun Yin ◽  
Limei Zhou
Keyword(s):  
High Activity ◽  
Heterogeneous Catalyst ◽  
Ammonium Salts ◽  
Cu Nanoparticles ◽  
Highly Active ◽  
Modified Montmorillonite ◽  
Carboxylic Esters

Cu-Q-MMT catalyst was prepared by immobilizing Cu nanoparticals on the biquaternary ammonium salts modified montmorillonite and exhibited high activity for cascade sequence to indole-2-carboxylic esters.

Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

2016 ◽  
Vol 25 (3) ◽  
pp. 361-370 ◽  
Author(s):  
Jiaxin Liu ◽  
Botao Qiao ◽  
Yian Song ◽  
Hailian Tang ◽  
Yudong Huang ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Au Nanoparticles ◽  
Zno Nanowires ◽  
Highly Active

Catalytic Activity and Physical Properties of Nanoparticles Metal Supported on Bentonite for Hydrogenolysis of Glycerol

2011 ◽  
Vol 364 ◽  
pp. 211-216
Author(s):  
Noraini Hamzah ◽  
Wan Nor Roslam Wan Isahak ◽  
Nadia Farhana Adnan ◽  
Nor Asikin Mohamad Nordin ◽  
Mohamad Bin Kassim ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Pressure ◽  
Au Nanoparticles ◽  
Catalyst System ◽  
Impregnation Method ◽  
Tem Analysis ◽  
Glycerol Hydrogenolysis ◽  
Initial Hydrogen Pressure ◽  
Catalyst Acidity ◽  
Average Size

Catalysts prepared from a variety of noble metal (Os, Ru, Pd and Au) supported on bentonite using impregnation method were studied and it found these series catalyst system gave different activity and selectivity. Among these catalysts, Os/bentonite and Ru/bentonite catalyst showed high activity in glycerol hydrogenolysis reaction at 150°C, 2.0 MPa initial hydrogen pressure for 7 hours. TEM analysis revealed that these nanometal particles catalyst have different in size and result showed that Os and Ru which have smaller average size in range 1-3 nm gave high activity which are 54.1% and 61.2% respectively. In contrast, less activity was obtained when using Pd/bentonite (29.0%) and Au/bentonite (27.8%) catalyst and TEM result showed that Pd and Au nanoparticles have large average particles size (8-10) nm. NH3-TPD analysis revealed that Ru/bentonite and Os/bentonite catalyst gave high total acidity and this behaviour contribute to high activity of the catalyst. This study revealed that size of nanoparticles and catalyst acidity play an important role in the activity and selectivity in glycerol hydrogenolysis reaction. These catalysts were also characterized by BET, XRD and XPS in order to get some physicochemical properties of the catalyst.

Electrodeposited SiO2 film: a promising interlayer of a highly active Ti electrode for the oxygen evolution reaction

2016 ◽  
Vol 4 (30) ◽  
pp. 11949-11956 ◽  
Author(s):  
Lian-Kui Wu ◽  
Xin-Yu Liu ◽  
Ji-Ming Hu
Keyword(s):  
High Activity ◽  
Oxide Layer ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Silica Film ◽  
Sio2 Film ◽  
Highly Active ◽  
Porous Morphology ◽  
Highly Porous

A Ti-supported IrO2 or RuO2 coated electrode with significantly improved electrocatalytic activity for the OER was fabricated using a highly porous electrodeposited silica film as the interlayer. The highly porous morphology ensures its high activity. The “inter-locking” structure between the active oxide layer and SiO2 film prolongs its life.

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