Catalytic Properties of Ni3Al Foils for Hydrogen Production

2006 ◽  
Vol 980 ◽  
Author(s):  
Toshiyuki Hirano
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Initial Period ◽  
Catalytic Performance ◽  
Methanol Decomposition ◽  
High Catalytic Activity ◽  
Reaction Conditions ◽  
Spontaneous Formation ◽  
Thin Foils ◽  
Characteristic Features

AbstractWe have successfully developed thin foils of boron-free Ni3Al (below 100 μm in thickness) by cold rolling, and recently found that the foils exhibit high catalytic activity for methanol decomposition. A little has been known about catalytic activity in Ni3Al. Even more interestingly, the high catalytic activity appears on flat foils whose surface area is very low. This paper provides a review of the characteristic features of the catalytic properties investigated in my group. Methanol was effectively decomposed into H2 and CO over the foils above 713 K. The production rates of H2 and CO increased with an increase of time during the initial period of reaction, indicating that the Ni3Al foils were spontaneously activated under the reaction conditions. Surface analyses revealed that fine Ni particles dispersed on carbon nanofibers formed on the foils during the reaction. The high catalytic performance of the foils can be attributed to the spontaneous formation of this nanostructure during the reaction.

Catalytic Properties of Ni3Al Foils for Hydrogen Production

2011 ◽  
Vol 306-307 ◽  
pp. 130-133 ◽  
Author(s):  
Toshiyuki Hirano ◽  
Ya Xu ◽  
Masahiko Demura
Keyword(s):  
Hydrogen Production ◽  
Carbon Nanofibers ◽  
Catalytic Properties ◽  
Initial Period ◽  
Catalytic Performance ◽  
Methanol Decomposition ◽  
Reaction Conditions ◽  
Spontaneous Formation ◽  
Cold Rolled ◽  
Characteristic Features

This paper presents the characteristic features of the catalytic properties of the cold-rolled Ni3Al foils for methanol decomposition which were developed in our group. Methanol was effectively decomposed into H2 and CO over the foils above 713 K. The production rates of H2 and CO increased with an increase of time during the initial period of reaction, indicating that the Ni3Al foils were spontaneously activated under the reaction conditions. Surface analyses revealed that fine Ni particles dispersed on carbon nanofibers formed on the foils during the reaction. The high catalytic performance of the foils can be attributed to the spontaneous formation of this nanostructure during the reaction.

Liquid-Phase Catalytic Oxidation of Styrene by a Fiber-Supported Copper(II) Complex with High Catalytic Performance

2014 ◽  
Vol 1033-1034 ◽  
pp. 61-64 ◽  
Author(s):  
Hong Hong Yang ◽  
Ge Wang ◽  
Shan Shan Yan ◽  
Jing Feng ◽  
Zhen Dong Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Temperature ◽  
Supported Catalyst ◽  
Catalytic Performance ◽  
Subsequent Treatment ◽  
High Catalytic Activity ◽  
Reaction Conditions ◽  
Tert Butyl Hydroperoxide ◽  
New Type ◽  
Polymer Supported

A new type of polymer-supported catalyst, [PS-(PBIM)2Cu (II)], was synthesized by loading 2-(2’-pyridyl) benzimidazole on chloromethylated propylene-styrene graft copolymer fiber and subsequent treatment with Cu (OAc)2 in methanol. The prepared catalyst was used in the oxidation of styrene with tert-butyl hydroperoxide (TBHP) as the oxidant. The important reaction conditions, such as the reaction temperature, the ratio of oxidant/styrene, and the recycle times were examined. The experimental results show that the catalyst reveals relatively high catalytic performance with 84% conversion for styrene. The suitable conditions are as follows: n (styrene):n (TBHP)=1:3, the reaction temperature of 80 °C and the reaction time of 8 h. In addition, the catalyst used repeatedly for 3 times can still possess high catalytic activity.

scholarly journals Catalytic synthesis of n -butyl carboxylate with immobilized ionic liquid based on response surface methodology optimization

2019 ◽  
Vol 6 (8) ◽  
pp. 190166
Author(s):  
Ran Liu ◽  
Ke Zhang ◽  
Chen Liu ◽  
Yanhui Hu ◽  
Lilong Zhou ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Catalytic Activity ◽  
Response Surface ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Reaction Conditions ◽  
Butyl Butyrate ◽  
Box Behnken Design ◽  
Methyl Sulfonate

Four kinds of functional ionic liquids (ILs) ([C 3 SO 3 Hnmp]HSO 4 ), 1-(3-sulfopropyl)-1-methylpyrrolidone phosphate ([C 3 SO 3 Hnmp]H 2 PO 4 ), 1-(3-sulfopropyl)-1-methylpyrrolidone p-toluene sulfonate ([C 3 SO 3 Hnmp]CH 3 SO 3 H) and 1-(3-sulfopropyl)-1-methylpyrrolidone methyl sulfonate ([C 3 SO 3 Hnmp]C 6 H 6 SO 3 H)) were prepared and the catalytic activity of these ILs during esterification of carboxylic acids (formic acid, acetic acid, propionic acid, butyric acid) with alcohols was investigated. The results indicated that the IL ([C 3 SO 3 Hnmp]HSO 4 ) exhibited an optimal catalytic performance. And then the IL ([C 3 SO 3 Hnmp]HSO 4 ) was immobilized to the silica gel. The immobilized IL performed more excellent catalytic activity than the unsupported [C 3 SO 3 Hnmp]HSO 4 . The effects of reaction temperature, reaction time, molar ratio of acid to alcohol and catalyst dosage were investigated. The response surface methodology based on the Box–Behnken design (BBD) was used to explore the best reaction condition of different experimental variables. Accordingly, a high n -butyl butyrate yield of 97.10% under the deduced optimal reaction conditions was obtained, in good agreement with experimental results and that predicted by the BBD model. The immobilized IL [C 3 SO 3 Hnmp]HSO 4 maintained high catalytic activity after five cycles.

scholarly journals Influence of the Reduction Temperature and the Nature of the Support on the Performance of Zirconia and Alumina-Supported Pt Catalysts for n-Dodecane Hydroisomerization

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 88
Author(s):  
Diana García-Pérez ◽  
Maria Consuelo Alvarez-Galvan ◽  
Jose M. Campos-Martin ◽  
Jose L. G. Fierro
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Catalytic Properties ◽  
Catalytic Performance ◽  
Major Influence ◽  
Pt Catalysts ◽  
Reduction Temperature ◽  
Metal Dispersion ◽  
Tungsten Oxides ◽  
Supported Pt Catalysts

Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major influence on metal dispersion, which impacts the catalytic activity. In addition, alumina and zirconia supports show different catalytic properties (mainly acid site strength and surface area), which play an important role in the conversion. The NH3-TPD profiles indicate that the acidity in alumina-based catalysts is clearly higher than that in their zirconia counterparts; this acidity can be attributed to a stronger interaction of the WOx species with alumina. The PtW/Al catalyst was found to exhibit the best catalytic performance for the hydroisomerization of n-dodecane based on its higher acidity, which was ascribed to its larger surface area relative to that of its zirconia counterparts. The selectivity for different hydrocarbons (C7–10, C11 and i-C12) was very similar for all the catalysts studied, with branched C12 hydrocarbons being the main products obtained (~80%). The temperature of 350 °C was clearly the best reduction temperature for all the catalysts studied in a trickled-bed-mode reactor.

Synthesis of heteroleptic phosphine–copper(i) complexes: fluorescence sensing and catalytic properties

2021 ◽  
Author(s):  
Chen-Lin Luo ◽  
Chu-Xing Hu ◽  
Ping Shang ◽  
Guan-Zhao Wen ◽  
Jia-Jun Zhu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Silver Ions ◽  
High Catalytic Activity ◽  
Diphosphine Ligands ◽  
Fluorescence Sensing ◽  
Cuaac Reaction

A series of heteroleptic Cu(i) complexes were precisely synthesized using different bipyridine and diphosphine ligands. These complexes exhibited fluorescence sensing towards silver ions and high catalytic activity towards the CuAAC reaction.

Performance Study of Nano-TiO2 Modified Fabric

2012 ◽  
Vol 549 ◽  
pp. 733-736
Author(s):  
Xiao Mian Chen ◽  
Jing Jing Shi ◽  
Hong Sha Su ◽  
Chun Ting Lin ◽  
En Long Yang
Keyword(s):  
Titanium Dioxide ◽  
Catalytic Activity ◽  
Catalytic Properties ◽  
Antibacterial Property ◽  
Wear Behavior ◽  
Water Repellency ◽  
Innovative Technology ◽  
Water Repellent ◽  
High Catalytic Activity ◽  
Performance Study

The catalytic properties of nano-TiO2 modified fabric suits the demand for self-cleaning in recent years. In this paper, advanced and innovative technology were used to synthesize water sol of titanium dioxide photocatalyst with high catalytic activity for fabric finishing. The wear behavior, antibacterial property and water repellency of treated and untreated fabric were tested. Results indicate that finishing and washing of the titanium dioxide had no effect on wear behavior; finished and washed fabric has a certain antibacterial and water repellent properties.

scholarly journals Catalytic Activity of Ni3Al Foils in Methanol Reforming

2010 ◽  
Vol 636-637 ◽  
pp. 895-900 ◽  
Author(s):  
P. Jozwik ◽  
R. Grabowski ◽  
Z. Bojar
Keyword(s):  
Catalytic Activity ◽  
Chemical Properties ◽  
Methanol Conversion ◽  
Advanced Materials ◽  
Coarse Grained ◽  
High Tech ◽  
High Catalytic Activity ◽  
Water Mixture ◽  
Catalytic Coating ◽  
Thin Foils

Intermetallic Ni3Al–based alloys (doped with zirconium and boron) represent a group of advanced materials with potential outstanding physical and chemical properties (such as high catalytic activity and structural stability in corrosive environments) that make them a considerable candidate for many high-tech applications. In this paper, the catalytic activity of fully dense Ni3Al-based thin foils (as thin as 50 m) possessing structures with micrometer or nanometer grain sizes is discussed. The examined material, without any additional catalytic coating, was successfully produced from as-cast coarse-grained sheets by heavy cold rolling and recrystallisation with an appropriately chosen set of parameters. The examination focuses on methanol and methanol/water mixture decomposition into H2 and CO at temperatures up to 530OC in a quartz reactor. Except for these products, a small amount (below 1%) of CO2 and dimethyl ether was observed. The catalyzed reaction began effectively at about 400OC, with a methanol conversion of about 90% or higher.

Facile preparation of a hierarchically porous metal–organic nanocomposite with excellent catalytic performance

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 97399-97403 ◽  
Author(s):  
Rui Kuang ◽  
Luyi Zheng ◽  
Ethan Cottrill ◽  
Ning Pan ◽  
Yanhui Chi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aging Process ◽  
Porous Metal ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Hierarchically Porous ◽  
Hierarchical Porous ◽  
Metal Organic ◽  
Facile Preparation ◽  
Excellent Catalytic Performance

A hierarchical porous MOF nanocrystal, hpCuL (L = 2,4,6-tris(3,5-dicarboxylatephenylamino)-1,3,5-triazine) was prepared via a facile gel-aging process. This nanocomposite exhibits high catalytic activity and stability for the reduction of 4-nitrophenol.

A phosphorene-like InP3 monolayer: structure, stability, and catalytic properties toward the hydrogen evolution reaction

2020 ◽  
Vol 8 (3) ◽  
pp. 1307-1314 ◽  
Author(s):  
Abdul Jalil ◽  
Zhiwen Zhuo ◽  
Zhongti Sun ◽  
Fang Wu ◽  
Chuan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
First Principles ◽  
Carrier Mobility ◽  
Catalytic Properties ◽  
Structure Stability ◽  
High Catalytic Activity ◽  
First Principles Calculations ◽  
Direct Bandgap

Phosphorene-like InP3 is reported with first-principles calculations, which is a direct-bandgap semiconductor with anisotropic carrier mobility and high catalytic activity toward the hydrogen evolution reaction.

Catalytic Properties of Ni/CNTs and Ca-Promoted Ni/CNTs for Methanation Reaction of Carbon Dioxide

2014 ◽  
Vol 924 ◽  
pp. 217-226 ◽  
Author(s):  
Xiang Feng Hu ◽  
Wen Yang ◽  
Ning Wang ◽  
Shi Zhong Luo ◽  
Wei Chu
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Catalytic Properties ◽  
Supported Catalyst ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Methanation Reaction ◽  
Ni Species ◽  
Nickel Species

Nickel/carbon nanotubes (Ni/CNTs), Nickel/alumina (Ni/Al2O3), calcium-promoted Ni/CNTs and calcium-promoted Ni/Al2O3 were synthesized by impregnation method. Methanation of carbon dioxide was used as a probe to evaluate their catalytic performance. The features of these Ni-based catalysts were investigated via XRD, H2-TPR, H2-TPD and the N2 adsorptiondesorption isotherms. H2-TPR showed that nickel species on Ni/CNTs was reduced more easily with respect to that on Ni/Al2O3, and addition of Ca can increase the content of easily reducible Ni species for Ni/CNTs. XRD and H2-TPD indicated that addition of Ca promoted dispersion for CNTs-supported catalyst. These finding ultimately enhanced catalytic activity and stability for Ni/CNTs catalyst modified with Ca.

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