Acetylene photocatalytic oxidation using continuous flow reactor: Gas phase and adsorbed phase investigation, assessment of the photocatalyst deactivation

Photocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an annular continuous flow reactor for the gas-phase PCO were used. Maximum aqueous PCO efficiency was achieved in alkaline media. Two mechanisms of aqueous PCO—decomposition to formate and ammonia, and oxidation of organic nitrogen directly to nitrite—lead ultimately toCO2, water, ammonia, and nitrate: formate and nitrite were observed as intermediates. A part of the ammonia formed in the reaction was oxidized to nitrite and nitrate. Volatile PCO products of MA included ammonia, nitrogen dioxide(NO2), nitrous oxide(N2O), carbon dioxide, and water. Thermal catalytic oxidation (TCO) resulted in the formation of ammonia, hydrogen cyanide, carbon monoxide, carbon dioxide, and water. The gas-phase PCO kinetics is described by the monomolecular Langmuir-Hinshelwood model. No deactivation ofTiO2catalyst was observed.

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Development of a tubular continuous flow reactor for the investigation of improved gas–solid interaction in photocatalytic CO2 reduction on TiO2

Photochemical & Photobiological Sciences ◽

10.1039/c8pp00518d ◽

2019 ◽

Vol 18 (2) ◽

pp. 314-318 ◽

Cited By ~ 5

Author(s):

Martin Dilla ◽

Ahmet E. Becerikli ◽

Alina Jakubowski ◽

Robert Schlögl ◽

Simon Ristig

Keyword(s):

Gas Phase ◽

Continuous Flow ◽

Flow Reactor ◽

Tubular Reactor ◽

Co2 Reduction ◽

Continuous Flow Reactor ◽

Reactor Geometry

Newly developed tubular reactor geometry allows intensive gas–solid interaction in photocatalytic gas-phase CO2 reduction.

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Translucent nanoparticle-based aerogel monoliths as 3-dimensional photocatalysts for the selective photoreduction of CO2 to methanol in a continuous flow reactor

Materials Horizons ◽

10.1039/c7mh00423k ◽

2017 ◽

Vol 4 (6) ◽

pp. 1115-1121 ◽

Cited By ~ 26

Author(s):

Felix Rechberger ◽

Markus Niederberger

Keyword(s):

Gas Phase ◽

Continuous Flow ◽

Flow Reactor ◽

Gas Phase Reactions ◽

3 Dimensional ◽

Continuous Flow Reactor

A newly developed prototype of a flow reactor enables the exploitation of nanoparticle based aerogel monoliths as macroscopically sized photocatalysts in gas phase reactions.

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Photocatalytic Oxidation of Selected Organic Contaminants and Inactivation of Microorganisms in a Continuous Flow Reactor Packed with Titania-Doped Silica

10.4271/2005-01-2991 ◽

2005 ◽

Cited By ~ 5

Author(s):

M. Joanne Garton ◽

Paul A. Chadik ◽

David W. Mazyck ◽

Samuel R. Farrah

Keyword(s):

Organic Contaminants ◽

Continuous Flow ◽

Photocatalytic Oxidation ◽

Flow Reactor ◽

Continuous Flow Reactor

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Photocatalytic degradation of H2S in the gas-phase using a continuous flow reactor coated with TiO2-based acrylic paint

Environmental Technology ◽

10.1080/09593330.2018.1440010 ◽

2018 ◽

Vol 40 (17) ◽

pp. 2276-2289 ◽

Cited By ~ 1

Author(s):

Eduardo Borges Lied ◽

Camilo Freddy Mendoza Morejon ◽

Rodrigo Leonardo de Oliveira Basso ◽

Ana Paula Trevisan ◽

Paulo Rodrigo Stival Bittencourt ◽

...

Keyword(s):

Photocatalytic Degradation ◽

Gas Phase ◽

Continuous Flow ◽

Flow Reactor ◽

Acrylic Paint ◽

Continuous Flow Reactor

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Photocatalytic oxidation of low concentration 2,4-D solution with new TiO2 fiber catalyst in a continuous flow reactor

Water Science & Technology ◽

10.2166/wst.2006.858 ◽

2006 ◽

Vol 54 (8) ◽

pp. 55-63 ◽

Cited By ~ 12

Author(s):

Y. Terashima ◽

H. Ozaki ◽

R.R. Giri ◽

T. Tano ◽

S. Nakatsuji ◽

...

Keyword(s):

Organic Carbon ◽

Mass Balance ◽

Continuous Flow ◽

Photocatalytic Oxidation ◽

Flow Reactor ◽

Solution Temperature ◽

Co2 Gas ◽

Ph Adjustment ◽

Continuous Flow Reactor ◽

Tio2 Fiber

Environmental pollution by low concentrations of 2,4-Dichlorophenoxyacetic acid (2,4-D) is a concern these days due to ever increasingly stringent regulations. Photocatalysis with immobilized TiO2 fiber is a promising oxidation method. Laboratory experiments on photocatalytic degradation of 0.045 mmol l−1 2,4-D with the world's first high-strength TiO2 fiber catalyst were carried out in a continuous flow reactor in which the degradations were, in general, similar to those with high 2,4-D concentrations investigated elsewhere. Degradation and mineralization of 2,4-D were significantly enhanced with no initial pH adjustments. The rate constants for total organic carbon (TOC) without pH adjustment were about two-fold bigger than the pH adjustment cases. CO2 gas measurement and carbon mass-balance were carried out for the first time, where about 34% organic carbon converted into CO2 gas during four-hour oxidation. 2,4-Dichlorophenol (2,4-DCP), phenol, benzyl alcohol and two unknowns (RT≈2.65 and 3.78 min.) were detected as aromatic intermediates while Phenol was the new aromatic in HPLC analysis. Dechlorination efficiencies were high (>70%) in all the cases, and more than 90% efficiencies were observed in chloride mass balance. Bigger flow rates and solution temperature fixed at 20 °C without pH adjustment greatly enhanced 2,4-D mineralization. These results can be an important basis in applying the treatment method for dioxin-contaminated water and wastewater.

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