Preparation of Nanosized Pt-Au Alloy Catalyst and Its Activity in Methanol Oxidation

2007 ◽  
Vol 7 (11) ◽  
pp. 4073-4076 ◽  
Author(s):  
Ki-Joong Kim ◽  
Yong-Hwa Kim ◽  
Woon-Jo Jeong ◽  
Seung-Won Jeong ◽  
Jong-Che Park ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Flow Reactor ◽  
Metal Catalyst ◽  
Deposition Method ◽  
Oxidation Activity ◽  
Preparation Methods ◽  
Oxidation Of Methanol ◽  
Alloy Catalyst

The alloy catalyst has been widely used because it will be able to improve the activity and selectivity of the single metal catalyst in a given chemical reaction. In this study, the preparation and characteristics of nanosized Pt and Au particles on alumina and their catalytic activity were described. Nanosized Pt–Au catalysts were prepared by impregnation (IMP) method and deposition (DP) method using alumina or ZnO/Al2O3 as support. The size of Pt and Au particles were observed by transmission electron microscopy (TEM), energy dispersive spectroscope (EDS), and X-ray diffraction (XRD). Catalytic activity for oxidation of methanol was measured using a flow reactor. It could be seen that the Pt particle size and dispersion in the alloy catalysts was rarely influenced by preparation methods and Au particles coated by deposition method were well dispersed. TEM images showed that Au particles were well dispersed in the Pt/Au/ZnO/Al2O3 catalyst of which Au particles was supported by deposition method. The catalytic activity for methanol are given in the order of Pt-Au[IMP]/ZnO/Al2O3 > Pt[IMP]/Au[DP]/ZnO/Al2O3 > Au[DP]/Pt[IMP]/ZnO/Al2O3 > Pt-Au[DP]/ZnO/Al2O3. Therefore, Au particle size was doing not play an important role in increasing the oxidation activity, but the Au particles may promote the methanol oxidation.

The interplay between ceria particle size, reducibility, and ethanol oxidation activity of ceria-supported gold catalysts

2018 ◽  
Vol 3 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Gregory M. Mullen ◽  
Edward J. Evans ◽  
Benjamin C. Siegert ◽  
Nathan R. Miller ◽  
Benjamin K. Rosselet ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxidation Activity ◽  
Supported Gold Catalysts ◽  
Supported Gold ◽  
Ceria Particle

The size of ceria particles influenced the activity of Au/CeO2 catalysts for ethanol oxidation, demonstrating a linear correlation between oxygen storage capacity and catalytic activity.

Electrodeposition of PtNi Nanosheets on Flexible PET/ITO Substrate and their Electrocatalytic Properties for Methanol Oxidation

2015 ◽  
Vol 33 ◽  
pp. 150-157 ◽  
Author(s):  
Xiao Ya Jia ◽  
Jian Wei Zhao ◽  
Li Rong Qin ◽  
Cai Feng Yang
Keyword(s):  
Catalytic Activity ◽  
Fuel Cell ◽  
Electrochemical Deposition ◽  
Deposition Method ◽  
Facile Synthesis ◽  
Oxidation Of Methanol ◽  
Ni Content ◽  
Electrochemical Deposition Method ◽  
Electro Oxidation ◽  
Pet Substrate

We report a facile synthesis of PtNi nanosheets on the flexible ITO/PET substrate by electrochemical deposition method. The morphology and composition of the PtNi nanosheets were characterized and it was revealed that the PtNi nanosheets were polycrystalline with a thickness of about 4 nm. The average Ni content in the nanosheets was about 10 at%. The results of the electrochemical measurements showed that the PtNi nanosheets have excellent catalytic activity and stability toward the electro-oxidation of methanol in alkaline medium, which making it more attractive for fuel cell applications.

scholarly journals Effect of Preparation Methods on the Performance of Pt/TiO2 Catalysts for the Catalytic Oxidation of Carbon Monoxide in Simulated Sintering Flue Gas

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 804
Author(s):  
Jianyu Cai ◽  
Zehui Yu ◽  
Jian Li
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Flue Gas ◽  
Ball Mill ◽  
Water Resistance ◽  
Physical Structure ◽  
Impregnation Method ◽  
Oxidation Of Co ◽  
Preparation Methods ◽  
So2 Adsorption

A series of Pt/TiO2 catalysts were prepared by the impregnation (IM), dry ball mill (DB), or wet ball mill (WB) methods, and their catalytic activity for the oxidation of CO was evaluated. The structure and redox properties of the catalysts were investigated by N2 desorption, XRD, SEM, TEM, XPS, H2-TPR, SO2-TPD, and CO chemisorption analysis. It was determined that the preparation method affects the physical structure of the catalyst and the particle size and dispersion of Pt on the catalyst surface. The catalyst prepared by the impregnation method had a more suitable physical structure than the other catalysts, with a smaller particle size, a higher dispersion of Pt on the surface, and the lowest strength of SO2 adsorption. Pt/TiO2(IM) catalysts presented the best catalytic activity for the oxidation of CO in simulated sintering flue gas at 140 °C, as well as better sulfur and water resistance with simulated sintering flue gas containing 50 ppm of SO2 and 15% water vapor.

Electrocatalytic Oxidation of Methanol on an Pd/Pyy/Niad-atoms Electrode

2013 ◽  
Vol 10 (5) ◽  
Author(s):  
Mohamed Abdelfattah Ibrahim ◽  
Taha Hanfy ◽  
A. A. Al-Ghamdi ◽  
Farid El-Tantawy ◽  
Hossam S. Rageb
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Electrocatalytic Oxidation ◽  
Oxidation Of Methanol

In this paper we study the effect of Niad-atoms on the activity of a Pd/Pyy nanocomposite anode, we find that the catalytic activity of an anode towards methanol oxidation increased by threefold in the presence of Niad-atoms.

Catalytic Activity of Porous Pd-Ni Thin Foam towards Electrooxidation of Methanol

2013 ◽  
Vol 16 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Ming Jin ◽  
Houyi Ma
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Low Cost ◽  
Nickel Content ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Oxidation Of Methanol ◽  
One Step ◽  
Dynamic Template ◽  
Electrooxidation Of Methanol

Porous Pd-Ni thin foam was fabricated by a rapid one-step electrodeposition process within hydrogen bubble dynamic template and characterized by SEM, EDS, and cyclic voltammetry. Morphology and composition of the foam can be modified significantly by applying different deposition conditions, such as concentration ratio of Pd (II) ions to Ni (II) ions in electrolytic solution and deposition time. Electrocatalytic activities of the foam towards methanol oxidation in alkaline media were investigated, which depend mainly on Pd components and its morphology. Low nickel content can assist Pd further enhance the electrocatalytic performance, particularly the tolerance to intermediates of methanol oxidation, while high nickel content brings adverse effect. The high catalytic activity and the low cost of the Pd-Ni foams enable them to be promising electrocatalysts for the oxidation of methanol in alkaline media.

Mn-Mo-O Catalysts for Methanol Oxidation. II. Oxidation of Methanol

1992 ◽  
Vol 57 (12) ◽  
pp. 2539-2547 ◽  
Author(s):  
Krasimir Ivanov ◽  
Penka Litcheva ◽  
Dimitar Klissurski
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Catalytic Properties ◽  
Effect Of Temperature ◽  
Second Step ◽  
Gas Mixture ◽  
Direct Oxidation ◽  
Step Process ◽  
Oxidation Of Methanol ◽  
Small Excess

The catalytic properties of MnMoO4-based catalysts toward methanol oxidation are investigated. The effect of temperature, flow rate and gas mixture composition on the catalytic activity is established. The highest activity and selectivity (comparable with those of industrial catalysts) of the samples obtained by precipitation in the presence of a small excess of MoO3 was found. The oxidation of methanol on MnMoO4-based catalyst is proposed to be a two-step process. The first step includes methanol interaction with Mo(VI) and reduction of Mo(VI) to Mo(V) (Mo(IV)). The second step consists in direct oxidation of the reduced molybdenum by oxygen from the alcohol-air mixture.

Combinatorial Development of Ternary Electrocatalysts for Methanol Oxidation

2007 ◽  
Author(s):  
Peter Strasser
Keyword(s):  
Catalytic Activity ◽  
High Throughput ◽  
Direct Methanol Fuel Cell ◽  
Corrosion Stability ◽  
Oxidation Of Methanol ◽  
Direct Methanol ◽  
Pt Alloy ◽  
Methanol Fuel Cell ◽  
Alloy Catalysts ◽  
Alloy Catalyst

We report a combinatorial and high throughput catalyst optimization of ternary Pt-Co-Ru alloy electrocatalysts for the oxidation of methanol in Direct Methanol Fuel Cell anodes. A densely sampled ternary Pt alloy catalyst library was prepared and electrochemically tested in parallel for catalytic activity. A composition-activity map was obtained from which suitable catalyst candidates with improved activity were identified. Then, high throughput methods for evaluating corrosion stability of the alloy catalysts were developed based on structural and compositional criteria. Finally, combining stability-composition and activity-composition maps resulted in consensus maps which pointed to a new optimized ternary alloy electrocatalyst with overall composition Pt18Co62Ru20.

scholarly journals Formation of Pt–Ag alloy on different silicas – surface properties and catalytic activity in oxidation of methanol

RSC Advances ◽  
2017 ◽  
Vol 7 (16) ◽  
pp. 9534-9544 ◽  
Author(s):  
Joanna Wisniewska ◽  
Maria Ziolek
Keyword(s):  
Catalytic Activity ◽  
Surface Properties ◽  
Methanol Oxidation ◽  
Methyl Formate ◽  
Oxidation Of Methanol

Pt–Ag alloy is formed on silicas if Ag/Pt ≥ 2.5 and gives the highest methyl formate selectivity in methanol oxidation.

scholarly journals Synthesis and Characterization of Metal Modified Catalysts for Decomposition of Ibuprofen from Aqueous Solutions

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 786 ◽  
Author(s):  
Soudabeh Saeid ◽  
Matilda Kråkström ◽  
Pasi Tolvanen ◽  
Narendra Kumar ◽  
Kari Eränen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Catalytic Activity ◽  
Liquid Chromatography ◽  
Metal Particle ◽  
Catalytic Ozonation ◽  
Preparation Methods ◽  
Metal Particle Size ◽  
Ozonation Process ◽  
By Products

The presence of pharmaceuticals in surface water, drinking water, and wastewater has attracted significant concern because of the non-biodegradability, resistance, and toxicity of pharmaceutical compounds. The catalytic ozonation of an anti-inflammatory pharmaceutical, ibuprofen was investigated in this work. The reaction mixture was analyzed and measured by high-performance liquid chromatography (HPLC). Liquid chromatography-mass spectrometry (LC-MS) was used for the quantification of by-products during the catalytic ozonation process. Ibuprofen was degraded by ozonation under optimized conditions within 1 h. However, some intermediate oxidation products were detected during the ibuprofen ozonation process that were more resistant than the parent compound. To optimize the process, nine heterogeneous catalysts were synthesized using different preparation methods and used with ozone to degrade the ibuprofen dissolved in aqueous solution. The aim of using several catalysts was to reveal the effect of various catalyst preparation methods on the degradation of ibuprofen as well as the formation and elimination of by-products. Furthermore, the goal was to reveal the influence of various support structures and different metals such as Pd-, Fe-, Ni-, metal particle size, and metal dispersion in ozone degradation. Most of the catalysts improved the elimination kinetics of the by-products. Among these catalysts, Cu-H-Beta-150-DP synthesized by the deposition–precipitation process showed the highest decomposition rate. The regenerated Cu-H-Beta-150-DP catalyst preserved the catalytic activity to that of the fresh catalyst. The catalyst characterization methods applied in this work included nitrogen adsorption–desorption, scanning electron microscopy, transmission electron microscopy, and Fourier-transform infrared spectroscopy. The large pore volume and small metal particle size contributed to the improved catalytic activity.

Synthesis of ultrafine amorphous PtP nanoparticles and the effect of PtP crystallinity on methanol oxidation

RSC Advances ◽  
2014 ◽  
Vol 4 (40) ◽  
pp. 20722-20728 ◽  
Author(s):  
Yanjiao Ma ◽  
Hui Wang ◽  
Hao Li ◽  
Julian Key ◽  
Shan Ji ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Carbon Black ◽  
Methanol Oxidation ◽  
Small Particle ◽  
Amorphous Structure ◽  
High Catalytic Activity ◽  
Small Particle Size ◽  
Electrocatalytic Performance ◽  
Different Levels

Ultrafine amorphous PtP nanoparticles supported on carbon black were prepared. Comparison of electrocatalytic performance of the samples with different levels of crystallinity showed ultrafine amorphous PtP nanoparticles have high catalytic activity for methanol oxidation due to their small particle size and amorphous structure.

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