Synthesis of Co/N-HNTs composites and investigation on its catalytic activity for H2 generation

2016 ◽  
Vol 183 ◽  
pp. 615-621 ◽  
Author(s):  
Dongcui Zhao ◽  
Zhilin Cheng ◽  
Zhaodong Nan
Keyword(s):  
Catalytic Activity ◽  
H2 Generation

scholarly journals Near-Monodisperse Ni−Cu Bimetallic Nanocrystals of Variable Composition: Controlled Synthesis and Catalytic Activity for H2 Generation

2008 ◽  
Vol 112 (32) ◽  
pp. 12092-12095 ◽  
Author(s):  
Yawen Zhang ◽  
Wenyu Huang ◽  
Susan E. Habas ◽  
John N. Kuhn ◽  
Michael E. Grass ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Variable Composition ◽  
Controlled Synthesis ◽  
H2 Generation ◽  
Bimetallic Nanocrystals

scholarly journals Pt-Ni Nanoalloys for H2 Generation from Hydrous Hydrazine

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 930
Author(s):  
Liu Zhou ◽  
Xianjin Luo ◽  
Lixin Xu ◽  
Chao Wan ◽  
Mingfu Ye
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Design Principle ◽  
Chemical Characteristics ◽  
High Hydrogen ◽  
Factors Affecting ◽  
Dehydrogenation Reaction ◽  
High Hydrogen Content ◽  
H2 Generation ◽  
Hydrogen Carrier

Hydrous hydrazine (N2H4∙H2O) is a candidate for a hydrogen carrier for storage and transportation due to low material cost, high hydrogen content of 8.0%, and liquid stability at room temperature. Pt and Pt nanoalloy catalysts have been welcomed by researchers for the dehydrogenation of hydrous hydrazine recently. Therefore, in this review, we give a summary of Pt nanoalloy catalysts for the dehydrogenation of hydrous hydrazine and briefly introduce the decomposition mechanism of hydrous hydrazine to prove the design principle of the catalyst. The chemical characteristics of hydrous hydrazine and the mechanism of dehydrogenation reaction are briefly introduced. The catalytic activity of hydrous hydrazine on different supports and the factors affecting the selectivity of hydrogen catalyzed by Ni-Pt are analyzed. It is expected to provide a new way for the development of high-activity catalysts for the dehydrogenation of hydrous hydrazine to produce hydrogen.

Preparation of magnetic Co/graphene sheets composites and investigation on its catalytic activity for H2 generation

2016 ◽  
Vol 09 (01) ◽  
pp. 1650009 ◽  
Author(s):  
Dongcui Zhao ◽  
Zhaodong Nan
Keyword(s):  
Magnetic Field ◽  
Catalytic Activity ◽  
Reaction Temperature ◽  
Chemical Method ◽  
Generation Rate ◽  
Graphene Sheets ◽  
One Pot ◽  
Initial Concentration ◽  
H2 Generation ◽  
Hydrolysis Of

A cobalt (Co)/graphene sheets (GRs) composite was synthesized via a one-pot chemical method. The composite shows high saturation magnetizations (Ms), which leads it to be conveniently separated from aqueous solution by an external magnetic field. Compared to the pure Co and some references, the catalytic activity of the as-obtained composite was significantly enhanced for the generation of H2 gas by hydrolysis of NaBH4 solution. Effects of NaBH4 initial concentration, the composite and reaction temperature on the H2 generation rate were investigated. The H2 generation rate is independent with the initial NaBH4 concentration, increased with the reaction temperature increasing. The composite can be continuously used several times with about the same catalytic activity.

scholarly journals Polarisation tuneable piezo-catalytic activity of Nb-doped PZT with low Curie temperature for efficient CO2 reduction and H2 generation

2021 ◽  
Vol 3 (5) ◽  
pp. 1362-1374
Author(s):  
Yan Zhang ◽  
Pham Thi Thuy Phuong ◽  
Nguyen Phuc Hoang Duy ◽  
Eleanor Roake ◽  
Hamideh Khanbareh ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Curie Temperature ◽  
Co2 Reduction ◽  
Acoustic Power ◽  
Particle Agglomeration ◽  
First Report ◽  
H2 Generation ◽  
Agglomeration Effects ◽  
Detailed Assessment ◽  
The Impact

First report on a detailed assessment of the impact of applied acoustic power, particle agglomeration effects and impact of Tc on piezo-catalysis for CO2 reduction.

scholarly journals Catalytic Behavior of Iron-Containing Cubic Spinel in the Hydrolysis and Hydrothermolysis of Ammonia Borane

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5422
Author(s):  
Oksana V. Komova ◽  
Valentina I. Simagina ◽  
Alena A. Pochtar ◽  
Olga A. Bulavchenko ◽  
Arcady V. Ishchenko ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ammonia Borane ◽  
Copper Ferrite ◽  
High Catalytic Activity ◽  
Oxide Systems ◽  
Catalytic Behavior ◽  
H2 Generation ◽  
Cobalt Ferrites ◽  
Reduction Of Iron ◽  
Magnetite Fe3o4

The paper presents a comparative study of the activity of magnetite (Fe3O4) and copper and cobalt ferrites with the structure of a cubic spinel synthesized by combustion of glycine-nitrate precursors in the reactions of ammonia borane (NH3BH3) hydrolysis and hydrothermolysis. It was shown that the use of copper ferrite in the studied reactions of NH3BH3 dehydrogenation has the advantages of a high catalytic activity and the absence of an induction period in the H2 generation curve due to the activating action of copper on the reduction of iron. Two methods have been proposed to improve catalytic activity of Fe3O4-based systems: (1) replacement of a portion of Fe2+ cations in the spinel by active cations including Cu2+ and (2) preparation of highly dispersed multiphase oxide systems, involving oxide of copper.

Study of the enhanced visible-light-sensitive photocatalytic activity of Cr2O3-loaded titanate nanosheets for Cr(vi) degradation and H2 generation

2017 ◽  
Vol 7 (11) ◽  
pp. 2283-2297 ◽  
Author(s):  
Junqian Ding ◽  
Julan Ming ◽  
Dingze Lu ◽  
Wenhui Wu ◽  
Min Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Large Surface Area ◽  
H2 Generation ◽  
Titanate Nanosheets

Cr2O3-loaded titanate nanosheets with large surface area show excellent visible-light catalytic activity for Cr(vi) degradation and H2 generation.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

Prolonged Expression of Procoagulant Activity of Human Platelets Degranulated by Thrombin

1995 ◽  
Vol 74 (03) ◽  
pp. 958-961 ◽  
Author(s):  
Raelene L Kinlough-Rathbone ◽  
Dennis W Perry
Keyword(s):  
Catalytic Activity ◽  
Thrombus Formation ◽  
Annexin V ◽  
Human Platelets ◽  
Procoagulant Activity ◽  
Prothrombinase Complex ◽  
Arterial Thrombus ◽  
Flowing Blood

SummaryPlatelets are exposed to thrombin when they take part in arterial thrombus formation, and they may return to the circulation when they are freed by fibrinolysis and dislodged by flowing blood. Thrombin causes the expression of procoagulant activity on platelets, and if this activity persists, the recirculating platelets may contribute to subsequent thrombosis. We have developed techniques to degranulate human platelets by treatment with thrombin, and recover them as single, discrete platelets that aggregate in response to both weak and strong agonists. In the present study we examined the duration of procoagulant activity on the surface of thrombin-degranulated platelets by two methods: a prothrombinase assay, and the binding of 125I-labeled annexin. Control platelets generated 0.9 ± 0.4 U thrombin per 107 platelets in 15 min. Suspensions of thrombin-degranulated platelets formed 5.4 ± 0.1 U thrombin per 107 platelets in this time. Binding of 125I-annexin V was also greater with thrombin-treated platelets than with control platelets (controls: 1.7 ±0.1 ng annexin/107 platelets; thrombin-degranulated platelets: 6.8 ± 0.2 ng annexin/107 platelets). With thrombin-degranulated platelets, increased procoagulant activity and annexin binding persisted for at least 4 h after degranulation and resuspension, indicating that the catalytic activity for the prothrombinase complex is not reversed during this time. These platelets maintained their ability to aggregate for 4 h, even in response to the weak agonist, ADP. Thus, platelets that have taken part in thrombus formation and returned to the circulation may contribute to the promotion of further thrombotic events because of the persistence of procoagulant activity on their surface.

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