Oscillations and patterns in a model of simultaneous CO and C2H2 oxidation and NOx reduction in a cross-flow reactor

2015 ◽  
Vol 17 (9) ◽  
pp. 6458-6469 ◽  
Author(s):  
Otto Hadač ◽  
Martin Kohout ◽  
Jaromír Havlica ◽  
Igor Schreiber
Keyword(s):  
Flow Reactor ◽  
Heterogeneous Reaction ◽  
Nox Reduction ◽  
Tubular Reactor ◽  
Cross Flow ◽  
Spatiotemporal Patterns

Spatiotemporal patterns predicted by a model of a cross-flow tubular reactor with a complex heterogeneous reaction are linked to unstable reaction subnetworks identified in the mechanism.

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

2019 ◽  
Vol 18 (2) ◽  
pp. 314-318 ◽  
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.

scholarly journals Volatility and lifetime against OH heterogeneous reaction of ambient Isoprene Epoxydiols-Derived Secondary Organic Aerosol (IEPOX-SOA)

2016 ◽  
Author(s):  
Weiwei Hu ◽  
Brett B. Palm ◽  
Douglas A. Day ◽  
Pedro Campuzano-Jost ◽  
Jordan E. Krechmer ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Secondary Organic Aerosol ◽  
Heterogeneous Reaction ◽  
Ambient Air ◽  
Organic Aerosol ◽  
Amazon Forest ◽  
Reaction Products ◽  
Ambient Conditions ◽  
Forested Areas ◽  
Humidity Dependence

Abstract. Isoprene epoxydiols-derived secondary organic aerosol (IEPOX-SOA) can contribute substantially to organic aerosol (OA) concentrations in forested areas under low NO conditions, hence significantly influencing the regional and global OA budgets, accounting for example for 16–36 % of the submicron OA in the SE US summer. Particle evaporation measurements from a thermodenuder show that the volatility of ambient IEPOX-SOA is lower than that of bulk OA and also much lower than that of known monomer IEPOX-SOA tracer species, indicating that IEPOX-SOA likely exists mostly as oligomers in the aerosol phase. The OH aging process of ambient IEPOX-SOA was investigated with an oxidation flow reactor (OFR). New IEPOX-SOA formation in the reactor was negligible, as the OFR cannot accelerate processes such as aerosol uptake and reactions that do not scale with OH. Simulation results indicate that adding ~ 100 µg m−3 of pure H2SO4 to the ambient air allows to efficiently form IEPOX-SOA in the reactor. The heterogeneous reaction rate coefficient of ambient IEPOX-SOA with OH radical (kOH) was estimated as 4.0 ± 2.0 × 10−13 cm3 molec−1 s−1, which is equivalent to more than a 2-week lifetime. A similar kOH was found for measurements of OH oxidation of ambient Amazon forest air in an OFR. At higher OH exposures in the reactor (> 1 × 1012 molec. cm−3 s), the mass loss of IEPOX-SOA due to heterogeneous reaction was mainly due to revolatilization of fragmented reaction products. We report for the first time OH reactive uptake coefficients (γOH = 0.59 ± 0.33 in SE US and γOH = 0.68 ± 0.38 in Amazon) for SOA under ambient conditions. A relative humidity dependence of kOH and γOH was observed, consistent with surface area-limited OH uptake. No decrease of kOH was observed as OH concentrations increased. These observation of physicochemical properties of IEPOX-SOA can help to constrain OA impact on air quality and climate.

Salt-mediated polyol synthesis of silver nanowires in a continuous-flow tubular reactor

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 29872-29877 ◽  
Author(s):  
Kan-Sen Chou ◽  
Chung-Yen Hsu ◽  
Bo-Tau Liu
Keyword(s):  
Continuous Flow ◽  
Reduction Method ◽  
Flow Reactor ◽  
Silver Nanowires ◽  
Tubular Reactor ◽  
Polyol Synthesis ◽  
Continuous Flow Reactor

Silver nanowires were successfully synthesized by a polyol reduction method in a continuous-flow reactor with a yield of 2 g h−1.

scholarly journals Kinetic study of hydrolysis of ethyl acetate using caustic soda

2018 ◽  
Vol 7 (4) ◽  
pp. 1995 ◽  
Author(s):  
Mostafa Ghobashy ◽  
Mamdouh Gadallah ◽  
Tamer T.El-Idreesy ◽  
M. A.Sadek ◽  
Hany A.Elazab
Keyword(s):  
Caustic Soda ◽  
Ethyl Acetate ◽  
Flow Reactor ◽  
Design Method ◽  
Plug Flow ◽  
Tubular Reactor ◽  
Acid Base ◽  
Chemical Reaction Kinetics ◽  
Hydrolysis Of

We report here, the hydrolysis of ethyl acetate by using caustic soda which is followed by means of conductance measurements which is widely used in chemical industry. The main aim of this research is to study the parameters of production of ethyl acetate by chemical reaction kinetics using an anion ion-exchange acting as a catalyst and acid-base titrations. The reaction of ethyl acetate and sodium hydroxide (caustic-soda) is done in a plug-flow reactor (steady-state tubular reactor) under the effect of different parameters including temperature, concentration and flow-rate, which allows the determination of activation energy and rate constants, due to large number of experiments. Factorial design method is used for the calculations of the experiment. It was determined that the order of the reaction is a second-order reaction.  

Spatiotemporal patterns in models of cross-flow reactors

2001 ◽  
Vol 70 (4) ◽  
pp. 383-391 ◽  
Author(s):  
Moshe Sheintuch ◽  
Olga Nekhamkina
Keyword(s):  
Cross Flow ◽  
Spatiotemporal Patterns ◽  
Flow Reactors

Comparison of Raschig Ring Packing Pattern via Mean Resident Time using CFD Particle Tracing Technique: Dry Methane Reforming for Case Study

2018 ◽  
Author(s):  
Nattaporn Chutichairattanaphum ◽  
Phavanee Narataruksa ◽  
Karn Pana-Suppamassadu ◽  
Sabaithip Tungkamani ◽  
Chaiwat Prapainainar ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Flow Behavior ◽  
Plug Flow ◽  
Tubular Reactor ◽  
Packed Bed ◽  
Methane Reforming ◽  
Particle Tracing ◽  
Raschig Ring ◽  
Resident Time

This paper aims to study the effect of raschig ring packing patterns using Computational Fluid Dynamics (CFD). CFD module of particle tracing was established to measure particles diffusing through the packed bed. The support raschigs catalyst was modeled in three patterns within a tubular reactor – namely, vertical staggered, chessboard staggered and reciprocal staggered pattern. A case study of Dry Methane Reforming (DMR) was investigated at 600°C, 1 atm. The study of Mean Resident Time (MRT) and E(t) function were investigated to identify the packing pattern performance. The results showed that the minimum value of the E(t), which means the flow behavior, was close to ideal plug flow behavior. MRT can be used to systematically identify the deviation from the ideal plug flow reactor of the three different packing patterns.

Spatiotemporal patterns in models of cross-flow reactors. Regular and oscillatory kinetics

2001 ◽  
Vol 56 (3) ◽  
pp. 771-778 ◽  
Author(s):  
Olga Nekhamkina ◽  
Boris Y. Rubinstein ◽  
Moshe Sheintuch
Keyword(s):  
Cross Flow ◽  
Spatiotemporal Patterns ◽  
Flow Reactors

Complex spatiotemporal patterns in an open-flow reactor

1994 ◽  
Vol 49 (6) ◽  
pp. 5207-5217 ◽  
Author(s):  
Massimo Sangalli ◽  
Hsueh-Chia Chang
Keyword(s):  
Flow Reactor ◽  
Spatiotemporal Patterns ◽  
Open Flow

scholarly journals Continuous preparation of carbon-nanotube-supported platinum catalysts in a flow reactor directly heated by electric current

2011 ◽  
Vol 7 ◽  
pp. 1412-1420 ◽  
Author(s):  
Alicja Schlange ◽  
Antonio Rodolfo dos Santos ◽  
Ulrich Kunz ◽  
Thomas Turek
Keyword(s):  
Large Scale ◽  
Flow Reactor ◽  
Continuous Process ◽  
Tubular Reactor ◽  
Carbon Support ◽  
Time Saving ◽  
Highly Active ◽  
Supported Platinum Catalysts ◽  
Cost Efficient ◽  
High Degree

In this contribution we present for the first time a continuous process for the production of highly active Pt catalysts supported by carbon nanotubes by use of an electrically heated tubular reactor. The synthesized catalysts show a high degree of dispersion and narrow distributions of cluster sizes. In comparison to catalysts synthesized by the conventional oil-bath method a significantly higher electrocatalytic activity was reached, which can be attributed to the higher metal loading and smaller and more uniformly distributed Pt particles on the carbon support. Our approach introduces a simple, time-saving and cost-efficient method for fuel cell catalyst preparation in a flow reactor which could be used at a large scale.

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