scholarly journals In-situ ETEM Studies of Fe Catalyst NPs Formation under Molecular or Radicals/Activated Hydrogen Environments for the Growth of SWCNTs

2021 ◽  
Vol 27 (S2) ◽  
pp. 85-86
Author(s):  
Ileana Florea ◽  
Mariam Ezzedine ◽  
Mihai-Robert Zamfir ◽  
Loan Truong ◽  
Eleonor Caristan ◽  
...  
Keyword(s):  
Fe Catalyst

scholarly journals Ultrafine metal-polymer catalysts based on polyconjugated systems for Fisher–Tropsch synthesis

2020 ◽  
Vol 92 (6) ◽  
pp. 977-984
Author(s):  
Mayya V. Kulikova ◽  
Albert B. Kulikov ◽  
Alexey E. Kuz’min ◽  
Anton L. Maximov
Keyword(s):  
Tropsch Synthesis ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
Force Microscopy ◽  
Composite Catalysts ◽  
Fe Catalyst ◽  
Atomic Force ◽  
And Function ◽  
Metal Polymer

AbstractFor previously studied Fischer–Tropsch nanosized Fe catalyst slurries, polymer compounds with or without polyconjugating structures are used as precursors to form the catalyst nanomatrix in situ, and several catalytic experiments and X-ray diffraction and atomic force microscopy measurements are performed. The important and different roles of the paraffin molecules in the slurry medium in the formation and function of composite catalysts with the two types of aforementioned polymer matrices are revealed. In the case of the polyconjugated polymers, the alkanes in the medium are “weakly” coordinated with the metal-polymer composites, which does not affect the effectiveness of the polyconjugated polymers. Otherwise, alkane molecules form a “tight” surface layer around the composite particles, which create transport complications for the reagents and products of Fischer-Tropsch synthesis and, in some cases, can change the course of the in situ catalyst formation.

The Synthesis of CNTs over Hydroxyapatite by CVD and the Preparation of CNTs/HA in Situ Composite

2011 ◽  
Vol 704-705 ◽  
pp. 790-795
Author(s):  
Hai Peng Li ◽  
Li Hui Wang ◽  
Chun Yong Liang ◽  
Hong Shui Wang
Keyword(s):  
Transition Metal ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Metal Catalyst ◽  
Matrix Composites ◽  
Transition Metal Catalyst ◽  
Catalyst Carrier ◽  
Fe Catalyst ◽  
Selection Of

Carbon nanotubes (CNTs) over hydroxyapatite (HA) as catalyst carrier were synthesized successfully using transition metal by chemical vapor deposition (CVD). The influences of catalyst types on the synthesis of CNTs were investigated when using Fe, Co and Ni as transition metal catalyst respectively. The results showed that CNTs synthesized by Fe catalyst normally possess more ideal morphology and higher crystallinity than those by the other two. But the yield rates of CNTs synthesized by CVD were in the order of Ni>Fe>Co. On the basis of this, HA matrix composites reinforced by CNTs in-situ were prepared and their mechanical properties were studied preliminarily. This study supplies valuable information for controlling the property of CNTs/HA composite by the selection of catalyst.

Effect of support and second metal in catalytic in-situ generation of hydrogen peroxide by Pd-supported catalysts: application in the removal of organic pollutants by means of the Fenton process

2011 ◽  
Vol 63 (9) ◽  
pp. 2017-2024 ◽  
Author(s):  
S. Contreras ◽  
M. S. Yalfani ◽  
F. Medina ◽  
J. E. Sueiras
Keyword(s):  
Formic Acid ◽  
Supported Catalysts ◽  
Operating Cost ◽  
Ferrous Ion ◽  
Fenton Process ◽  
Ambient Conditions ◽  
Fe Catalyst ◽  
H2o2 Generation ◽  
In Situ Generation

A catalytic system for the generation of H2O2 from formic acid and oxygen at ambient conditions has been developed. Pd-supported catalysts (Pd/C, Pd/TiO2 and Pd/Al2O3) have been tested, showing that for bulk purposes Pd/Al2O3 is more favourable while for in-situ applications Pd/TiO2 seems to be preferable. However, when these catalysts were tested in the in-situ H2O2 generation for the oxidation of phenol by means of the Fenton process (in the presence of ferrous ion), Pd/TiO2 did not demonstrate the expected results, whereas Pd/Al2O3 showed to be an efficient catalyst. Therefore, Pd/Al2O3 is offered as a good catalyst for Fenton's reactions with in-situ generated H2O2. In order to optimize the operating cost of the process, different initial concentrations of formic acid have been tested with Pd/Al2O3, and it has been seen that lowering the initial amount of formic acid favours the efficiency of the process. The effect of the addition of a second metallic (Pt, Au, Fe, Cu) active phase was studied. Concerning H2O2 generation, best results were obtained with a Pd-Au catalyst for bulk production (long time) while for in-situ application Pd-Fe showed interesting results. The Pd-Fe catalyst also performed similarly to the semi-heterogeneous Fenton system involving Pd/Al2O3 and ferrous ion in the degradation of phenol. Therefore, Pd-Fe catalyst offered an interesting prospect for making a full heterogeneous catalyst for Fenton reaction involving in-situ generation of H2O2

In Situ Synthesis of Fe Catalyst and Carbon Nanotubes by Chemical Vapor Deposition

2008 ◽  
Vol 14 (S2) ◽  
pp. 10-11 ◽  
Author(s):  
ES Moore ◽  
R Sharma ◽  
P Rez ◽  
MMJ Treacy ◽  
A Gamalski
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
New Mexico ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
In Situ Synthesis ◽  
Fe Catalyst

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

Effects of synthesis temperature and Fe catalyst amount on the performance of in situ CNTs/TiB2 composites

2018 ◽  
Vol 745 ◽  
pp. 817-824 ◽  
Author(s):  
Jia Lin ◽  
Yihang Yang ◽  
Houan Zhang ◽  
Yulin Yang ◽  
Sijie Hu
Keyword(s):  
Synthesis Temperature ◽  
Catalyst Amount ◽  
Fe Catalyst

Reversible In-Situ Exsolution of Fe Catalyst in La0.5Sr1.5Fe1.5Mo0.5O6-δ Anode for SOFCs

2019 ◽  
Vol 91 (1) ◽  
pp. 1701-1710 ◽  
Author(s):  
He Qi ◽  
Tao Yang ◽  
Wenyuan Li ◽  
Liang Ma ◽  
Shanshan Hu ◽  
...  
Keyword(s):  
Fe Catalyst

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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