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Xiaoming Zheng - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of the decomposition of co2 in a dielectric packed bed Plasma Reactor
    Plasma Chemistry and Plasma Processing, 2012
    Co-Authors: Meng Kong, Tong Liu, Jinhua Fei, Xiaoming Zheng
    Abstract:

    The decomposition of CO2 in a dielectric packed-bed Plasma Reactor has been studied. It was found that the dielectric properties and morphology of packing dielectric pellets play important roles in the reaction due to their influence on the electron energy distribution in the Plasma. The acid–base properties of the packing materials also affect the reaction through the chemisorption of CO2 on basic sites of the materials. Heterogeneous reactions on the solid surfaces of the dielectric materials also play a role in the reaction, which was also confirmed through the investigation of the influence of the discharge length on the reaction. The reverse reaction of CO2 decomposition, the oxidation of CO, was also investigated to further understand the role of dielectric materials in the Plasma and their effect on Plasma reactions. Both the decomposition of CO2 and the oxidation of CO in non-packed or dielectric packed Reactors are first-ordered.

  • characteristics of the decomposition of co 2 in a dielectric packed bed Plasma Reactor
    Plasma Chemistry and Plasma Processing, 2012
    Co-Authors: Meng Kong, Tong Liu, Jinhua Fei, Xiaoming Zheng
    Abstract:

    The decomposition of CO2 in a dielectric packed-bed Plasma Reactor has been studied. It was found that the dielectric properties and morphology of packing dielectric pellets play important roles in the reaction due to their influence on the electron energy distribution in the Plasma. The acid–base properties of the packing materials also affect the reaction through the chemisorption of CO2 on basic sites of the materials. Heterogeneous reactions on the solid surfaces of the dielectric materials also play a role in the reaction, which was also confirmed through the investigation of the influence of the discharge length on the reaction. The reverse reaction of CO2 decomposition, the oxidation of CO, was also investigated to further understand the role of dielectric materials in the Plasma and their effect on Plasma reactions. Both the decomposition of CO2 and the oxidation of CO in non-packed or dielectric packed Reactors are first-ordered.

Meng Kong - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of the decomposition of co2 in a dielectric packed bed Plasma Reactor
    Plasma Chemistry and Plasma Processing, 2012
    Co-Authors: Meng Kong, Tong Liu, Jinhua Fei, Xiaoming Zheng
    Abstract:

    The decomposition of CO2 in a dielectric packed-bed Plasma Reactor has been studied. It was found that the dielectric properties and morphology of packing dielectric pellets play important roles in the reaction due to their influence on the electron energy distribution in the Plasma. The acid–base properties of the packing materials also affect the reaction through the chemisorption of CO2 on basic sites of the materials. Heterogeneous reactions on the solid surfaces of the dielectric materials also play a role in the reaction, which was also confirmed through the investigation of the influence of the discharge length on the reaction. The reverse reaction of CO2 decomposition, the oxidation of CO, was also investigated to further understand the role of dielectric materials in the Plasma and their effect on Plasma reactions. Both the decomposition of CO2 and the oxidation of CO in non-packed or dielectric packed Reactors are first-ordered.

  • characteristics of the decomposition of co 2 in a dielectric packed bed Plasma Reactor
    Plasma Chemistry and Plasma Processing, 2012
    Co-Authors: Meng Kong, Tong Liu, Jinhua Fei, Xiaoming Zheng
    Abstract:

    The decomposition of CO2 in a dielectric packed-bed Plasma Reactor has been studied. It was found that the dielectric properties and morphology of packing dielectric pellets play important roles in the reaction due to their influence on the electron energy distribution in the Plasma. The acid–base properties of the packing materials also affect the reaction through the chemisorption of CO2 on basic sites of the materials. Heterogeneous reactions on the solid surfaces of the dielectric materials also play a role in the reaction, which was also confirmed through the investigation of the influence of the discharge length on the reaction. The reverse reaction of CO2 decomposition, the oxidation of CO, was also investigated to further understand the role of dielectric materials in the Plasma and their effect on Plasma reactions. Both the decomposition of CO2 and the oxidation of CO in non-packed or dielectric packed Reactors are first-ordered.

Ch Subrahmanyam - One of the best experts on this subject based on the ideXlab platform.

  • NTP Reactor for a single stage methane conversion to methanol: Influence of catalyst addition and effect of promoters
    'Elsevier BV', 2019
    Co-Authors: Chawdhury Piu, Kumar Dheeraj, Ch Subrahmanyam
    Abstract:

    Partial oxidation of methane to methanol is one of the best routes for liquid oxygenates preparation. The present study describes the application of a non-thermal Plasma Reactor operated under dielectric barrier discharge mode with/without catalyst addition for a single stage methane conversion to methanol. Air has been chosen as the oxidant for methane partial oxidation. It is found that both the reactant conversion and product distribution are strongly dependent on the Reactor configuration, feed gases composition and also catalyst addition. A series of γ-Al2O3 supported Cu catalyst with metal oxide promoters (ZnO, ZrO2 and MgO) were integrated with Plasma zone as to obtain in-Plasma catalytic Reactor. Typical results show that the synergistic effect due to Plasma activation and catalytic action, significantly improves both CH4 conversion and CH3OH selectivity. The best methanol selectivity of ∼28% is achieved over the CuZrAl catalyst with a CH4 conversion of ∼11%, while Plasma Reactor provides only ∼18% CH3OH selectivity. The possible reaction mechanism of methanol formation inside the Plasma Reactor has been discussed, which highlights that the catalyst facilitates the adsorption of Plasma excited species and improves the performance of the Reactor

  • catalytic nonthermal Plasma assisted co processing of methane and nitrous oxide for methanol production
    Catalysis Today, 2015
    Co-Authors: Sk Mahammadunnisa, K Krushnamurty, Ch Subrahmanyam
    Abstract:

    The objective of the present study is the direct conversion of potential greenhouse gases methane (CH4) and nitrous oxide (N2O) into value added products like methanol, syngas, etc. in a nonthermal Plasma Reactor operated under ambient conditions. Typical results indicated that co-processing of the reactants has an advantage of in-situ decomposition of N2O into N2 and atomic oxygen that favors methane partial oxidation to methanol. In order to improve the selectivity to methanol, Plasma Reactor was operated by integrating CuO/CeO2, NiO/CeO2 and Cu-Ni (5-5)/CeO2 catalysts. Among the studied catalysts, Cu-Ni (5:5 wt%) supported on ceria showed the best selectivity of ∼36% to methanol.

  • abatement of mixture of volatile organic compounds vocs in a catalytic non thermal Plasma Reactor
    Journal of Hazardous Materials, 2012
    Co-Authors: J Karuppiah, R Karvembu, Linga E Reddy, Manoj Kumar P Reddy, B Ramaraju, Ch Subrahmanyam
    Abstract:

    Total oxidation of mixture of dilute volatile organic compounds was carried out in a dielectric barrier discharge Reactor with various transition metal oxide catalysts integrated in-Plasma. The experimental results indicated the best removal efficiencies in the presence of metal oxide catalysts, especially MnOx, whose activity was further improved with AgOx deposition. It was confirmed water vapor improves the efficiency of the Plasma Reactor, probably due to the formation of hydroxyl species, whereas, in situ decomposition of ozone on the catalyst surface may lead to nascent oxygen. It may be concluded that non-thermal Plasma approach is beneficial for the removal of mixture of volatile organic compounds than individual VOCs, probably due to the formation of reactive intermediates like aldehydes, peroxides, etc.

  • the catalytic effect of mnox and coox on the decomposition of nitrobenzene in a non thermal Plasma Reactor
    Chemical Engineering Journal, 2012
    Co-Authors: J Karuppiah, R Karvembu, Ch Subrahmanyam
    Abstract:

    Influence of water vapor on the oxidative decomposition of nitrobenzene in a dielectric barrier discharge (DBD) Plasma Reactor was investigated, where a sintered metal fibers (SMF) sheet modified with MnOx and CoOx has been used as the inner electrode. The designed in-Plasma catalytic Reactor in the presence of water vapor showed improved conversion and selectivity to total oxidation, which may be due to the formation of a strong oxidant hydroxyl radical. Optimization of various parameters like concentration, flow rate and applied energy has been carried out and it has been observed that CoOx supported SMF electrode showed better performance, especially for low concentrations of organic compound. In situ decomposition of ozone on the surface of the transition metal oxide modified SMF may also have favored better performance of the Plasma Reactor.

  • catalytic non thermal Plasma Reactor for abatement of toluene
    Chemical Engineering Journal, 2010
    Co-Authors: Ch Subrahmanyam, A Renken, Lioubov Kiwiminsker
    Abstract:

    A non-thermal Plasma rector with a catalytic electrode made of sintered metal fibres (SMFs) was tested for the oxidative decomposition of a model VOC toluene. The input energy was varied in the range 160–295 J/l by varying the applied voltage between 12.5 and 22.5 kV at 200 Hz. Influence of various parameters like toluene concentration, SMF modification by Mn and Co oxides, input energy and ozone formation was studied. It has been observed that Plasma catalytic approach is very effective for total oxidation of toluene at low input energy, especially at toluene concentration ≤250 ppm and SMF modification by transition metal oxides increased the performance of the Reactor significantly. MnOx modification appears to be a better choice compared to CoOx, which may be attributed to the in situ decomposition of ozone leading to the formation of more reactive oxidants like atomic oxygen.

J.-p. Keradec - One of the best experts on this subject based on the ideXlab platform.

  • electrical modelling of rf coupled inductors supplying a double frequency inductive Plasma Reactor
    Plasma Sources Science and Technology, 1999
    Co-Authors: P. Colpo, R. Ernst, J.-p. Keradec
    Abstract:

    A new inductive Plasma Reactor has been developed for thin-film depositions using the Plasma enhanced chemical vapour deposition (PECVD) process. This apparatus combines an inductive Plasma generation at 13.56 MHz, plus a direct heating of the substrate by a supplementary inductive set-up at 100 kHz. The unavoidable coupling of the two coaxial coils allows one electrical generator to force power in the other, compromising the reliability of the system, unless rejecting filters are inserted. Therefore, an equivalent circuit of the double-coil set is needed to specify and design the necessary filters. The aim of this paper is to present and justify the electrical representation of this very special, high-frequency transformer which has been used successfully.

  • Electrical modeling of HF coupled inductors supplying a double frequency inductive Plasma Reactor
    Proceedings of APEC 97 - Applied Power Electronics Conference, 1997
    Co-Authors: P. Colpo, R. Ernst, J.-p. Keradec
    Abstract:

    A new inductive Plasma Reactor has been developed for metal coating. It combines magnetic Plasma generation at 13.56 MHz and induction heating at 100 kHz. The unavoidable coupling of the two coaxial coils allows one electrical generator to force power in the other, compromising the reliability of the system, except if rejecting filters are inserted. Therefore, an equivalent circuit of the double coil set is needed to specify and design the necessary filters. The aim of this paper is to present and justify the electrical representation of this very special high frequency transformer which have been used successfully.

Nor Aishah Saidina Amin - One of the best experts on this subject based on the ideXlab platform.

  • dry reforming of methane using different dielectric materials and dbd Plasma Reactor configurations
    Energy Conversion and Management, 2017
    Co-Authors: Asif Hussain Khoja, Muhammad Tahir, Nor Aishah Saidina Amin
    Abstract:

    Abstract The effect of quartz and alumina dielectric materials on the efficiency of dielectric barrier discharge (DBD) cold Plasma Reactor using different configurations for dry reforming of methane (DRM) has been investigated. The performance of dielectric materials was analysed at different feed ratios, gas hourly space velocity (GHSV, h−1) and specific input energy (SIE, kJ L−1). In both Reactors, the main products detected were CO and H2 with considerable amounts of C2H6. Alumina Reactor prevailed in performance and the maximum conversion achieved was 74% and 68% for CH4 and CO2, respectively at GHSV (92 h−1) feed ratio (1:1), SIE (370 J ml−1) and discharge volume (VD = 15.7 cm3). The CO/H2 ratio and yields were also higher in alumina than the quartz Reactor under the same experimental conditions. Furthermore, different Reactor configurations displayed a significant impact in the performance of DBD Plasma. Increasing discharge volume (VD) enhanced the conversion and selectivity for both dielectrics. The energy efficiency (EE) was of 0.085 and 0.078 mmol kJ−1 for alumina and quartz, respectively. The high EE in alumina Reactor was evidently due to higher dielectric constant, which exhibited enhancement in power dissipation, discharge energy and Reactor temperature. Stability test conferred alumina DBD Plasma Reactor performed better than the quartz.

  • co generation of synthesis gas and c2 hydrocarbons from methane and carbon dioxide in a hybrid catalytic Plasma Reactor a review
    Fuel, 2006
    Co-Authors: Nor Aishah Saidina Amin
    Abstract:

    The topics on conversion and utilization of methane and carbon dioxide are important issues in tackling the global warming effects from the two greenhouse gases. Several technologies including catalytic and Plasma have been proposed to improve the process involving conversion and utilization of methane and carbon dioxide. In this paper, an overview of the basic principles, and the effects of CH4/CO2 feed ratio, total feed flow rate, discharge power, catalyst, applied voltage, wall temperature, and system pressure in dielectric-barrier discharge (DBD) Plasma Reactor are addressed. The discharge power, discharge gap, applied voltage and CH4/CO2 ratio in the feed showed the most significant effects on the Reactor performance. Co-feeding carbon dioxide with the methane feed stream reduced coking and increased methane conversion. The H2/CO ratio in the products was significantly affected by CH4/CO2 ratio. The synergism of the catalyst placed in the discharge gap and the Plasma affected the products distribution significantly. Methane and carbon dioxide conversions were influenced significantly by discharge power and applied voltage. The drawbacks of DBD Plasma application in the CH4‐CO2 conversion should be taken into consideration before a new plausible Reactor system can be implemented.