CO2 hydrogenation on Fe-based catalysts doped with potassium in gas phase and under supercritical conditions

2019 ◽  
Vol 29 (4) ◽  
pp. 382-384 ◽  
Author(s):  
Yana A. Pokusaeva ◽  
Aleksey E. Koklin ◽  
Valery V. Lunin ◽  
Victor I. Bogdan
Keyword(s):  
Gas Phase ◽  
Co2 Hydrogenation ◽  
Supercritical Conditions

scholarly journals Ultradispersed Mo/TiO2 catalysts for CO2 hydrogenation to methanol

2021 ◽  
Author(s):  
Thomas Len ◽  
Mounib Bahri ◽  
Ovidiu Ersen ◽  
Yaya Lefkir ◽  
Luis Cardenas ◽  
...  
Keyword(s):  
Gas Phase ◽  
Co2 Hydrogenation ◽  
Hydrogenation Of Co2 ◽  
Crucial Effect ◽  
Effect Of The Support

Mo/TiO2 catalysts with atomic dispersion of molybdenum appear active and stable in the gas-phase hydrogenation of CO2. The comparison between various titania materials shows a crucial effect of the support...

Hydrogenation of CO2 over 15% Fe/SiO2 Catalyst under Sub- and Supercritical Conditions

2018 ◽  
Vol 18 (4) ◽  
pp. 57-63
Author(s):  
N. D. Evdokimenko ◽  
K. O. Kim ◽  
G. I. Kapustin ◽  
N. A. Davshan ◽  
A. L. Kustov
Keyword(s):  
Gas Phase ◽  
Atmospheric Pressure ◽  
Iron Nanoparticles ◽  
Catalyst Surface ◽  
Phase Reaction ◽  
Supercritical Conditions ◽  
Gas Phase Reaction ◽  
Xrd Studies ◽  
First Time ◽  
Hydrogenation Of Co

The results of comparative studies of CO2hydrogenation over 15% Fe/SiO2catalyst under sub- and supercritical conditions are presented for the first time. The reaction was studied at 300–500 °C and atmospheric pressure in gas phase and at 95 atm under supercritical conditions. The molar H2: CO2ratio was 2 : 1. Under supercritical conditions, the selectivity to CO2decreased from 90–95 to 30–50 % at all temperatures, while the selectivity to hydrocarbons increased up to 60 %. The reaction under supercritical conditions, unlike gas-phase hydrogenation, produced alcohols. TG-DTG-DTA techniques were used to demonstrate 2.2-fold decrease in the quantity of carbon-like deposits in comparison to that in the gas-phase reaction. XRD studies revealed the formation of graphite-like species on the catalyst surface under gas-phase but not supercritical conditions. The developed process and catalyst for hydrogenation of CO2can be recommended to be further modified in order to improve the catalyst based on iron nanoparticles that is as expensive as 0.1–0.01 of the known catalysts for CO2hydrogenation.

How to make an efficient gas-phase heterogeneous CO2 hydrogenation photocatalyst

2020 ◽  
Vol 13 (9) ◽  
pp. 3054-3063 ◽  
Author(s):  
Tingjiang Yan ◽  
Na Li ◽  
Linlin Wang ◽  
Qin Liu ◽  
Abdinoor Jelle ◽  
...  
Keyword(s):  
Gas Phase ◽  
Photocatalytic Performance ◽  
Co2 Hydrogenation ◽  
Cubic Phases

rh/c-In2O3−x(OH)y with precisely adjustable fractions of rhombohedral and cubic phases were synthesized and enabled boosting photocatalytic performance toward CO2 hydrogenation.

n-Butane isomerization in the gas phase and under supercritical conditions

2008 ◽  
Vol 49 (1) ◽  
pp. 115-120 ◽  
Author(s):  
V. I. Bogdan ◽  
E. G. Khelkovskaya-Sergeeva ◽  
T. V. Vasina ◽  
V. B. Kazanskii
Keyword(s):  
Gas Phase ◽  
Supercritical Conditions ◽  
Butane Isomerization

Residual Gas Reactions in the Electron Microscope: I. Qualitative Observations on the Water Gas Reaction

1968 ◽  
Vol 26 ◽  
pp. 292-293
Author(s):  
Richard E. Hartman ◽  
Roberta S. Hartman ◽  
Peter L. Ramos
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Gas Phase ◽  
Absolute Temperature ◽  
Residual Gas ◽  
Gas Reactions ◽  
Image Position ◽  
The Right ◽  
Water Gas ◽  
Thinning Rate

The action of water and the electron beam on organic specimens in the electron microscope results in the removal of oxidizable material (primarily hydrogen and carbon) by reactions similar to the water gas reaction .which has the form:The energy required to force the reaction to the right is supplied by the interaction of the electron beam with the specimen.The mass of water striking the specimen is given by:where u = gH2O/cm2 sec, PH2O = partial pressure of water in Torr, & T = absolute temperature of the gas phase. If it is assumed that mass is removed from the specimen by a reaction approximated by (1) and that the specimen is uniformly thinned by the reaction, then the thinning rate in A/ min iswhere x = thickness of the specimen in A, t = time in minutes, & E = efficiency (the fraction of the water striking the specimen which reacts with it).

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

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