Conversion of propane-butane fraction into arenes on MFI zeolites activated by diffuse discharge plasma

2019 ◽  
Author(s):  
Mikhail Erofeev ◽  
Vasilii Ripenko ◽  
Vladimir Erofeev ◽  
Sophia Dzhalilova ◽  
Victor Tarasenko
Keyword(s):  
Discharge Plasma ◽  
Diffuse Discharge ◽  
Mfi Zeolites ◽  
Propane Butane

Study on the Generation and Modification of Surface Atmospheric Pressure Air Diffuse Discharge Plasma on Aramid Fabric

2021 ◽  
Author(s):  
Pengxiang Liu ◽  
Wenzheng Liu ◽  
Luxiang Zhao ◽  
Yiwei Sun ◽  
Jinhao Yi ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Diffuse Discharge ◽  
Aramid Fabric

scholarly journals OXIDATION OF PROPANE-BUTANE MIXTURE IN DIELECTRIC BARRIER DISCHARGE IN PRESENCE OF LIQUID OCTANE

2018 ◽  
Vol 61 (3) ◽  
pp. 88
Author(s):  
Sergey V. Kudryashov ◽  
Andrey Yu. Ryabov ◽  
Andrey N. Ocheredko
Keyword(s):  
Discharge Plasma ◽  
Barrier Discharge ◽  
Liquid Hydrocarbons ◽  
Plasma Chemical ◽  
Initial Concentration ◽  
Barrier Discharge Plasma ◽  
Butane Mixture ◽  
Gaseous Hydrocarbons ◽  
Discharge Gap ◽  
Propane Butane

The results of oxidation of a propane-butane mixture in a barrier discharge plasma in the presence of liquid octane are presented. The conversion of the gas-liquid mixture results in the formation of an oxygenate containing predominantly hydroxyl and carbonyl compounds with the same number of carbon atoms in a molecule as in the starting compounds. The presence of a liquid octane film flowing down the plasma-chemical reactor walls enables an effective removal of the reaction products from the discharge zone due to dissolution of the compounds formed therein. Alkyl radicals, atomic oxygen, and hydrogen are the main active particles. The formation of both oxygenated compounds and hydrocarbons with isomeric structure occurs as a result of their further chemical transformations. The mechanism of conversion of gaseous hydrocarbons is much like that for the conversion of liquid hydrocarbons in a barrier discharge plasma. They both are carried out under similar conditions. The change in the initial concentration of the propane-butane mixture in the gas phase from 10 to 75 % wt results in a decrease in the conversion of gaseous hydrocarbons from 4.1 to 0.9 % wt, while the conversion of octane decreases from 2.4 to 0.3% wt. in one pass through the reactor. The decrease in hydrocarbon conversion is due to decrease in the rate of formation of atomic oxygen in a discharge gap of the reactor. Theoretical calculations were performed using the software package Bolsig+ for the model oxygen-propane mixture. The results of calculations show that the rate constant of oxygen dissociation increases from 1.87·10-10 cm3/s to 6.71·10-9 cm3/s, due to an increase in the average electron energy from 3.4 to 4.1 eV. It was found out that the mass of products formed in result of oxidation of gaseous and liquid hydrocarbons depends on the initial concentration of the starting compounds in the vapor-gas mixture. A simple expression is proposed that allows one to evaluate the preferential direction of the plasma-chemical reaction as a function of the initial concentration of hydrocarbons in a discharge gap of the reactor.Forcitation:Kudryashov S.V., Ryabov A.Yu., Ocheredko A.N. Oxidation of propane-butane mixture in dielectric barrier discharge in presence of liquid octane. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 88-92

SYNGAS PRODUCTION FROM PROPANE-BUTANE MIXTURES USING A HIGH-VOLTAGE ATMOSPHERIC PRESSURE DISCHARGE PLASMA

2016 ◽  
Vol 47 (11) ◽  
pp. 1057-1072
Author(s):  
Feraih Sh. Alenazey ◽  
Ahmed A. Al-Harbi ◽  
A. P. Chernukho ◽  
Yuri M. Dmitrenko ◽  
Alexei N. Migoun ◽  
...  
Keyword(s):  
High Voltage ◽  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Syngas Production ◽  
Pressure Discharge ◽  
Atmospheric Pressure Discharge ◽  
Propane Butane

scholarly journals Generators of Atmospheric Pressure Diffuse Discharge Plasma and Their Use for Surface Modification

Plasma ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 27-38
Author(s):  
Mikhail Erofeev ◽  
Mikhail Lomaev ◽  
Vasilii Ripenko ◽  
Mikhail Shulepov ◽  
Dmitry Sorokin ◽  
...  
Keyword(s):  
Surface Layer ◽  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Atmospheric Pressure Plasma ◽  
Strength Distribution ◽  
Uniform Electric Field ◽  
Flow Mode ◽  
Diffuse Discharge ◽  
Circulation Mode ◽  
Discharge Gap

Studies of the properties of runaway electron preionized diffuse discharges (REP DDs) and their possible use have been carried out for more than 15 years. Three experimental setups generating a low-temperature atmospheric-pressure plasma and differing in the geometry of a discharge gap were developed. They allow the treatment of surfaces of different materials with an area of several tens of square centimeters. A diffuse discharge plasma was formed in the pulse–periodic mode by applying negative voltage pulses with an amplitude of several tens of kilovolts and a duration of 4 ns to a discharge gap with sharply non-uniform electric field strength distribution. This paper presents experimental results of the study of the surface layer microstructure of copper and steel specimens of different sizes after treatment with the REP DD plasma in nitrogen flow mode and nitrogen circulation mode in the discharge chamber. It was shown that after 105 discharge pulses, the carbon concentration decreases and a disoriented surface layer with a depth of up to 200 nm is formed. Moreover, the results of X-ray phase analysis did not reveal changes in the phase composition of the surface of copper specimens. However, as a result of surface treatment with the REP DD plasma, the copper lattice becomes larger and the microstress increases.

Study of Generation of Atmospheric Pulse-Periodic Diffuse Discharge Plasma to be Used for Sterilization and Decontamination

2007 ◽  
Author(s):  
Eduard Ya. Shcolnikov ◽  
Evgeny G. Krastelev ◽  
Sergey P. Maslennikov ◽  
Nikolay N. Netchaev ◽  
Andrey V. Chebotarev
Keyword(s):  
Discharge Plasma ◽  
Diffuse Discharge

scholarly journals Effect of ultraviolet irradiation or diffuse discharge plasma on structure and surface electrical charge of micro-arc calcium phosphate coatings

2021 ◽  
Vol 2064 (1) ◽  
pp. 012077
Author(s):  
E G Komarova ◽  
E A Kazantseva ◽  
V S Ripenko ◽  
A Zharin ◽  
Y P Sharkeev
Keyword(s):  
Uv Irradiation ◽  
Runaway Electron ◽  
Discharge Plasma ◽  
Amorphous Structure ◽  
Electrical Charge ◽  
X Ray ◽  
Diffuse Discharge ◽  
Phosphate Coatings ◽  
Micro Arc Oxidation ◽  
Calcium Phosphate Coatings

Abstract The studies of the effect of ultraviolet (UV) irradiation and plasma of a runaway electron preionized diffuse discharge (REP DD) post-treatments on the surface structure and electrical charge of the micro-arc oxidation (MAO) coatings were performed. The UV irradiation and plasma treatment did not effect on the morphology, roughness and thickness of the MAO coatings. However, these post-treatments led to formation of the small fraction of the crystalline CaHPO4phase in the X-ray amorphous structure of the coatings. Moreover, the UV and REP DD plasma treatments increased the electrostatic potential (EP) negative values from –85 mV to –126 mV of the coatings in the following order: MAO < MAO/UV (for 5 min) < MAO/Plasma (with 10,000 pulses) < MAO/UV (for 20 min) < MAO/Plasma (with 80,000 pulses).

scholarly journals Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2704
Author(s):  
Vladimir I. Erofeev ◽  
Sofiya N. Dzhalilova ◽  
Mikhail V. Erofeev ◽  
Vasilii S. Ripenko ◽  
Vladimir P. Reschetilowski
Keyword(s):  
Aromatic Hydrocarbons ◽  
Maximum Yield ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Silica Gels ◽  
Mfi Zeolite ◽  
Temperature Plasma ◽  
High Silica ◽  
Mfi Zeolites ◽  
Propane Butane

The effect of modification of MFI zeolite 1–5 wt.% ZnO activated by plasma on acid and catalytic properties in the conversion of the propane–butane fraction into arenes was investigated. The high-silica zeolites with silicate module 45 were synthesized from alkaline alumina–silica gels in the presence of an ‘X-oil’ organic structure-forming additive. The modification of the zeolite with zinc was carried out by impregnating the zeolite granules in the H-form with an aqueous solution of Zn(NO3)2. The obtained zeolites were characterized by X-ray phase analysis and IR spectroscopy. It is shown that the synthesized zeolites belong to the high-silica MFI zeolites. The study of microporous zeolite-containing catalysts during the conversion of C3-C4 alkanes to aromatic hydrocarbons made it possible to establish that the highest yield of aromatic hydrocarbons is observed on zeolite catalysts modified with 1 and 3% ZnO and amount to 63.7 and 64.4% at 600 °C, respectively, which is 7.7–8.4% more than on the original zeolite. The preliminary activation of microporous zeolites modified with 1–5% ZnO and plasma leads to an increase in the yield of aromatic hydrocarbons from the propane–butane fraction; the maximum yield of arenes is observed in zeolite catalysts modified with 1 and 3% ZnO and activated by plasma, amounting to 64.9 and 65.5% at 600 °C, respectively, which is 8.9–9.5% more than on the initial zeolite. The activity of the zeolite catalysts modified by ZnO and activated by plasma show good agreement with their acid properties. Activation of the zeolites modified by 1 and 3% ZnO and plasma leads to an increase in the concentration of the weak acid sites of the catalyst to 707 and 764 mmol/g in comparison with plasma-inactivated 1 and 3% ZnO/ZKE-XM catalysts at 626 and 572 mmol/g, respectively.

Photoelectrical Properties of Semiconductor in Contact with Gas Discharge Plasma

1997 ◽  
Vol 7 (5) ◽  
pp. 1039-1044
Author(s):  
N. N. Lebedeva ◽  
V. I. Orbukh ◽  
B. G. Salamov ◽  
M. Özer ◽  
K. Çolakoǧlu ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
Gas Discharge ◽  
Gas Discharge Plasma ◽  
Photoelectrical Properties

HIGH-CURRENT DIFFUSE DISCHARGE WITH THE EXPLOSIVE CATHODE PROCESS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-281-C7-282
Author(s):  
A. P. Kchuzeev ◽  
Yu. D. Korolev ◽  
V. A. Kuzmin ◽  
G. A. Mesyats ◽  
V. P. Rotshtein ◽  
...  
Keyword(s):  
High Current ◽  
Diffuse Discharge ◽  
Cathode Process

KINETICS OF THE ELECTRONS IN THE STATIONARY BEAM DISCHARGE PLASMA IN DIATOMIC GASES

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-261-C7-262
Author(s):  
R. Winkler ◽  
J. Wilhelm ◽  
A. A. Ivanov ◽  
V.V. Starykh
Keyword(s):  
Discharge Plasma ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document