scholarly journals Characterization Method for Gas Flow Reactor Experiments—NH3 Adsorption on Vanadium-Based SCR Catalysts

2021 ◽  
Author(s):  
Andres F. Suarez-Corredor ◽  
Matthäus U. Bäbler ◽  
Louise Olsson ◽  
Magnus Skoglundh ◽  
Björn Westerberg
Keyword(s):  
Gas Flow ◽  
Flow Reactor ◽  
Scr Catalysts ◽  
Nh3 Adsorption ◽  
Gas Flow Reactor

scholarly journals Oxidative Dehydrogenation of Propane over Vanadium-Containing Faujasite Zeolite

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1961 ◽  
Author(s):  
Małgorzata Smoliło ◽  
Katarzyna Samson ◽  
Ting Zhou ◽  
Dorota Duraczyńska ◽  
Małgorzata Ruggiero-Mikołajczyk ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Gas Flow ◽  
Flow Reactor ◽  
Fixed Bed ◽  
Oxidative Dehydrogenation Of Propane ◽  
Reaction Products ◽  
Promising Alternative ◽  
Vis Spectroscopy ◽  
Gas Flow Reactor ◽  
Faujasite Zeolite

Oxidative dehydrogenation (ODH) of light alkanes to olefins—in particular, using vanadium-based catalysts—is a promising alternative to the dehydrogenation process. Here, we investigate how the activity of the vanadium phase in ODH is related to its dispersion in porous matrices. An attempt was made to synthesize catalysts in which vanadium was deposited on a microporous faujasite zeolite (FAU) with the hierarchical (desilicated) FAU as supports. These yielded different catalysts with varying amounts and types of vanadium phase and the porosity of the support. The phase composition of the catalysts was confirmed by X-ray diffraction (XRD); low temperature nitrogen sorption experiments resulted in their surface area and pore volumes, and reducibility was measured with a temperature-programmed reduction with a hydrogen (H2-TPR) method. The character of vanadium was studied by UV-VIS spectroscopy. The obtained samples were subjected to catalytic tests in the oxidative dehydrogenation of propane in a fixed-bed gas flow reactor with a gas chromatograph to detect subtract and reaction products at a temperature range from 400–500 °C, with varying contact times. The sample containing 6 wt% of vanadium deposited on the desilicated FAU appeared the most active. The activity was ascribed to the presence of the dispersed vanadium ions in the tetragonal coordination environment and support mesoporosity.

Influence of the Time-Temperatur-Profile on Powder Characteristics of Nanocrystalline Anatase (TiO2) produced by Chemical Vapor Synthesis

2007 ◽  
Vol 1056 ◽  
Author(s):  
Ruzica Djenadic ◽  
Sankhanilay Roy Chowdhury ◽  
Marina Spasova ◽  
Andreas Gondorf ◽  
Erdal Akyildiz ◽  
...  
Keyword(s):  
Gas Flow ◽  
Flow Reactor ◽  
Chemical Vapor ◽  
Titanium Isopropoxide ◽  
Degree Of Crystallinity ◽  
Chemical Vapor Synthesis ◽  
Nanocrystalline Particles ◽  
Powder Characteristics ◽  
Gas Flow Reactor ◽  
Nanocrystalline Anatase Tio2

ABSTRACTChemical Vapor Synthesis (CVS) is the conversion of molecular species into nanocrystalline particles by chemical reactions in a gas flow reactor. Pure anatase nanoparticles are generated in a hot wall reactor from titanium isopropoxide using different time-temperature-profiles. The time-temperature-profile (T(t)-profile) in the gas phase of the reactor has a profound influence on the particle characteristics such as particle microstructure and surface chemistry and, therefore, on the quality of the powder consisting of nanocrystalline particles. In this study a simple reaction-coagulation-sintering model (CVSSIN) was used to predict influence of the T(t)-profile on the powder characteristics. The as-synthesized anatase powders show a very high degree of crystallinity, primary particle of about 10 nm sizes and a low degree of agglomeration.

Development of gas flow reactor with on-line monitoring system for nitrogen dioxide removal

2017 ◽  
Vol 135 ◽  
pp. 199-206 ◽  
Author(s):  
Korbua Chaisiwamongkhol ◽  
Noppadon Manoyen ◽  
Komkrit Suttiponparnit ◽  
Duangjai Nacapricha ◽  
Siwaporn Mejoo Smith ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Monitoring System ◽  
Gas Flow ◽  
Flow Reactor ◽  
On Line ◽  
Gas Flow Reactor

The influence of hydrogen and methane on the growth of carbon particles during acetylene pyrolysis in a burnt-gas flow reactor

2019 ◽  
Vol 37 (1) ◽  
pp. 1125-1132 ◽  
Author(s):  
S. Peukert ◽  
A. Sallom ◽  
A. Emelianov ◽  
T. Endres ◽  
M. Fikri ◽  
...  
Keyword(s):  
Gas Flow ◽  
Flow Reactor ◽  
Carbon Particles ◽  
Gas Flow Reactor

scholarly journals The role of carbon precursor on carbon nanotube chirality in floating catalyst chemical vapour deposition

Nanoscale ◽  
2016 ◽  
Vol 8 (39) ◽  
pp. 17262-17270 ◽  
Author(s):  
J. S. Barnard ◽  
C. Paukner ◽  
K. K. Koziol
Keyword(s):  
Carbon Nanotubes ◽  
Gas Flow ◽  
Vapour Deposition ◽  
Flow Reactor ◽  
Chemical Vapour ◽  
Carbon Precursor ◽  
Chiral Angle ◽  
Gas Flow Reactor ◽  
Nanotube Chirality

We have studied the influence of different carbon precursors (methane, ethanol and toluene) on the type, diameter and chiral angle distributions of carbon nanotubes (CNTs) grown with the floating catalyst technique in a horizontal gas-flow reactor.

Comparison of Diesel Oxidation Catalyst Performance on an Engine and a Gas Flow Reactor

2007 ◽  
Author(s):  
Alexander Knafl ◽  
Manbae Han ◽  
Stanislav V. Bohac ◽  
Dennis N. Assanis ◽  
Patrick G. Szymkowicz
Keyword(s):  
Gas Flow ◽  
Flow Reactor ◽  
Diesel Oxidation Catalyst ◽  
Oxidation Catalyst ◽  
Diesel Oxidation ◽  
Gas Flow Reactor

scholarly journals Hydrogen Production from Polymer Waste in a Gas-Flow Reactor

2019 ◽  
Author(s):  
HUNDA LI ◽  
SVETLANA GARELINA ◽  
NIKOLAY BULYCHEV ◽  
SERGEY KOLESNIK ◽  
MISHIK KAZARYAN
Keyword(s):  
Hydrogen Production ◽  
Gas Flow ◽  
Flow Reactor ◽  
Polymer Waste ◽  
Gas Flow Reactor

scholarly journals Preparation of isocyanates by carbamates thermolysis on the example of butyl isocyanate

2019 ◽  
Vol 58 (4) ◽  
pp. 40-47
Author(s):  
Ratmir R. Dashkin ◽  
◽  
Dmitry A. Gordeev ◽  
Khusrav Kh. Gafurov ◽  
Sergey N. Mantrov ◽  
...  
Keyword(s):  
Gas Phase ◽  
High Performance ◽  
Gas Flow ◽  
Flow Reactor ◽  
Packed Column ◽  
Biologically Active ◽  
Dibutyltin Dilaurate ◽  
Reaction Products ◽  
Uv Detector ◽  
Laboratory Setup

Butyl isocyanate is widely distributed as a precursor for the production of a number of biologically active substances: fungicides, preservatives, insecticides, personal care products, etc. Nowadays, there are a number of methods for the preparation of isocyanates, which can be divided into liquid phase and gas phase. One of the perspective methods for the production of isocyanates is the thermolysis of carbamate and/or the actions of various reaction activating agents, accompanied by the elimination of alcohol, but this process is reversible, which greatly complicates its use in industry. The paper presents the results of studies of non-catalytic thermal decomposition of N-alkylcarbamates with the formation of alkylisocyanates on the example of butylisocyanate in the gas phase, flow reactor in a wide temperature range (200 to 450 °C). In addition, a series of experiments was carried out using a catalyst, dibutyltin dilaurate, in order to reduce the thermolysis temperature and increase the yield of the final product. To implement the isocyanate production process, an experimental laboratory setup, consisting of a gas flow meter (argon) regulator, a packed column (for heating) and a sorption solution tank, was developed and tested. The thermolysis of N-n-butylcarbamate was carried out in two variations: the preparation of an individual n-butylisocyanate and the passage of reaction products through a sorption solution linking the n-butyl isocyanate to N-n-butyl-N '-(1-phenylethyl)urea, which allows to estimate the yield of the target n-butylisocyanate without additional losses. The analysis of the obtained substances was carried out by high performance liquid chromatography with a UV detector (target product) and a mass detector (analysis of by-products). According to the results of research, a modification of the laboratory facility was proposed, as well as n-butylisocyanate was obtained with a yield of 49% on the basis of a new technique.

Flow Structure and Heat Transfer in Stagnation Flow CVD Reactor

2010 ◽  
Author(s):  
Nasir Memon ◽  
Yogesh Jaluria
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Flow Reactor ◽  
Chemical Vapor ◽  
Design Parameters ◽  
Stagnation Flow ◽  
Inlet Length ◽  
The Impact

An experimental study is undertaken to investigate the flow structure and heat transfer in a stagnation flow Chemical Vapor Deposition (CVD) reactor at atmospheric pressure. It is critical to develop models that predict flow patterns in such a reactor to achieve uniform deposition across the substrate. Free convection can negatively affect the gas flow as cold inlet gas impinges on the heated substrate, leading to vortices and disturbances in the normal flow path. This experimental research will be used to understand the buoyancy-induced and momentum-driven flow structure encountered in an impinging jet CVD reactor. Investigations are conducted for various operating and design parameters. A modified stagnation flow reactor is built where the height between the inlet and substrate is reduced when compared to a prototypical stagnation flow reactor. By operating such a reactor at certain Reynolds and Grashof numbers it is feasible to sustain smooth and vortex free flow at atmospheric pressure. The modified stagnation flow reactor is compared to other stagnation flow geometries with either a varied inlet length or varied heights between the inlet and substrate. Comparisons are made to understand the impact of such geometric changes on the flow structure and the thermal boundary layer. In addition, heat transfer correlations are obtained for the substrate temperature. Overall, the results obtained provide guidelines for curbing the effects of buoyancy and for improving the flow field to obtain greater film uniformity when operating a stagnation flow CVD reactor at atmospheric pressure.

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