On the mechanism of methanol photooxidation to methylformate and carbon dioxide on TiO2: an operando-FTIR study

2015 ◽  
Vol 17 (17) ◽  
pp. 11277-11283 ◽  
Author(s):  
Mohamad El-Roz ◽  
Philippe Bazin ◽  
Marco Daturi ◽  
Frederic Thibault-Starzyk
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Phase Analysis ◽  
Mechanistic Study ◽  
Analysis Techniques ◽  
Ftir Study

This work is a mechanistic study of total and partial methanol photooxidation using operando FTIR coupled to gas phase analysis techniques (gas-IR and MS).

On the Activation of Methane and Carbon Dioxide by [HTaO]+ and [TaOH]+ in the Gas Phase: A Mechanistic Study

2016 ◽  
Vol 22 (30) ◽  
pp. 10581-10589 ◽  
Author(s):  
Marjan Firouzbakht ◽  
Nicole J. Rijs ◽  
Patricio González-Navarrete ◽  
Maria Schlangen ◽  
Martin Kaupp ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Mechanistic Study

Application of Disk Aerators to Recarbonation of Alkaline Wastewater from Wet Gasification of Carbide

1991 ◽  
Vol 24 (7) ◽  
pp. 277-284 ◽  
Author(s):  
E. Gomólka ◽  
B. Gomólka
Keyword(s):  
Carbon Dioxide ◽  
Liquid Phase ◽  
Gas Phase ◽  
Flue Gas ◽  
Carbonic Acid ◽  
Low Cost ◽  
Flue Gases ◽  
Carbon Dioxide Content ◽  
Patent Claim ◽  
Phase Dispersion

Whenever possible, neutralization of alkaline wastewater should involve low-cost acid. It is conventional to make use of carbonic acid produced via the reaction of carbon dioxide (contained in flue gases) with water according to the following equation: Carbon dioxide content in the flue gas stream varies from 10% to 15%. The flue gas stream may either be passed to the wastewater contained in the recarbonizers, or. enter the scrubbers (which are continually sprayed with wastewater) from the bottom in oountercurrent. The reactors, in which recarbonation occurs, have the ability to expand the contact surface between gaseous and liquid phase. This can be achieved by gas phase dispersion in the liquid phase (bubbling), by liquid phase dispersion in the gas phase (spraying), or by bubbling and spraying, and mixing. These concurrent operations are carried out during motion of the disk aerator (which is a patent claim). The authors describe the functioning of the disk aerator, the composition of the wastewater produced during wet gasification of carbide, the chemistry of recarbonation and decarbonation, and the concept of applying the disk aerator so as to make the wastewater fit for reuse (after suitable neutralization) as feeding water in acetylene generators.

Chemisorption of ethylene on nickel surfaces with preadsorbed oxygen

1981 ◽  
Vol 46 (2) ◽  
pp. 340-353
Author(s):  
Pavel Zachař ◽  
Zdeněk Bastl ◽  
Jakub Adámek
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Oxygen Concentration ◽  
Electrical Resistance ◽  
High Vacuum ◽  
Volumetric Method ◽  
Surface Oxygen ◽  
Oxygen Chemisorption ◽  
Thin Polycrystalline ◽  
Total Adsorption

Chemisorption of ethylene was studied on thin polycrystalline layers of nickel prepared by metal deposition in high vacuum and modified by preadsorbed oxygen. The volumetric method combined with the gas-phase analysis and the measurement of the electrical resistance changes of these layers were used. Already small amounts of preadsorbed oxygen of the order of 10-2 of the monolayer affect rather substantially the extent of ethylene chemisorption. The extent of the initial irreversible chemisorption and also the total adsorption of ethylene as a function of the amount of preadsorbed oxygen have a maximum at the surface oxygen concentration of 3 . 1013 molecule cm-2. The adsorption accompanied by the extensive dissociation of ethylene C-H bonds proceeds predominantly on nickel atoms with lower coordination (atoms on the microcrystal edges, corner atoms, etc.), where also oxygen chemisorption proceeds preferentially.

Gas phase interaction with catalytic oxidation reactions

1972 ◽  
Vol 326 (1565) ◽  
pp. 215-227 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Maleic Anhydride ◽  
Catalytic Oxidation ◽  
Gas Phase ◽  
Major Part ◽  
Oxidation Reactions ◽  
Mixed Gas ◽  
Kinetics Of ◽  
Oxidation Of Benzene ◽  
Homogeneous Decomposition

Studies of the catalytic oxidation of benzene to maleic anhydride and carbon dioxide over vanadia/molybdena catalysts show that the major part of the reaction involves interacting gas and gas-solid processes. The results are consistent with a mechanism in which a benzeneoxygen adduct is formed catalytically, desorbs and then reacts to give maleic anhydride entirely in the gas phase. On the basis of this proposed mechanism, the kinetics of individual reactions have been investigated in some depth. The over-oxidation of maleic anhydride has been found to be not significant under the conditions of reaction. The kinetic relationships governing the homogeneous decomposition of the adduct and the oxidation of the adduct to maleic anhydride and to carbon dioxide have been established. The results show that essentially all of the anhydride originates from mixed gas-solid/gas reaction while substantial amounts of carbon dioxide are produced entirely catalytically.

Four-wave mixing of picosecond pulses in hollow fibers: expanding the possibilities of gas-phase analysis

2001 ◽  
Vol 72 (5) ◽  
pp. 575-582 ◽  
Author(s):  
A.B. Fedotov ◽  
F. Giammanco ◽  
A.N. Naumov ◽  
P. Marsili ◽  
A. Ruffini ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Four Wave Mixing ◽  
Hollow Fibers ◽  
Wave Mixing ◽  
Picosecond Pulses

On the formation of the carbon dioxide anion radical CO2− · in the gas phase

1999 ◽  
Vol 185-187 ◽  
pp. 25-35 ◽  
Author(s):  
Detlef Schröder ◽  
Christoph A Schalley ◽  
Jeremy N Harvey ◽  
Helmut Schwarz
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Anion Radical

Active site separation of photocatalytic steam reforming of methane using Gas‐Phase Photoelectrochemical system

2021 ◽  
Author(s):  
Tomoki Kujirai ◽  
Akira Yamaguchi ◽  
Takeshi Fujita ◽  
Hideki Abe ◽  
Masahiro Miyauchi
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
High Temperatures ◽  
Steam Reforming ◽  
Active Site ◽  
Side Reaction ◽  
System P ◽  
Steam Reforming Of Methane

Steam reforming of methane (SRM) requires high temperatures to be promoted, and the production of carbon dioxide from the side reaction has also become a problem. In this study, we...

Rapid-responding carbon dioxide and oxygen electrodes

1964 ◽  
Vol 19 (3) ◽  
pp. 550-553 ◽  
Author(s):  
Irving Fatt
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Filter Paper ◽  
Oxygen Electrode ◽  
Membrane Material ◽  
Millipore Filter ◽  
Oxygen Electrodes ◽  
Final Response ◽  
Pco2 Measurement ◽  
Po2 Measurement

Redesign of the Severinghaus pCO2 and the Clark pO2 electrodes yields electrodes which are easier to make and assemble. When used with a new membrane material, paraffin-treated Millipore filter paper, the redesigned Severinghaus pCO2 electrode gives 99% response in 15 sec for a 40 mm Hg change in pCO2 in the region of 15–60 mm Hg pCO2 in either gas or water phase. The redesigned Clark pO2 electrode when used with treated Millipore paper gives 99% of final response in 1.24 sec for a 155 mm Hg change of pO2 in the gas phase in the range 0–160 mm Hg pO2. In aqueous solutions this electrode gives 99% response in 30 sec. Severinghaus electrode; polarographic oxygen electrode; pCO2 measurement; pO2 measurement Submitted on March 19, 1963

Sign in / Sign up

Export Citation Format

Share Document