Catalytic Nonthermal Plasma Reactor for Dry Reforming of Methane

Abstract

Co-processing of two greenhouse gases, methane and carbon dioxide, was carried out in a dielectric barrier plasma reactor. The influence of feed gas proportion on the performance of the plasma reactor was investigated, especially with an objective to increase the conversion of the reactants and selectivity to syngas. To understand the influence of the catalyst on dry reforming, 10–30% NiO/Al2O3 catalysts were prepared by a single-step combustion synthesis and various physicochemical techniques confirmed the formation of nanosized Ni particles. A total of 10% of the discharge volume was packed with Ni/Al2O3 catalysts in a packed-bed configuration. An interesting observation is the increased syngas selectivity on the addition of catalyst to plasma, and among the catalysts tested, 20% Ni showed a H2/CO ratio of 2.25 against 1.2 with a plasma reactor alone.

Enhancing C–H Bond Activation of Methane via Temperature-Controlled, Catalyst–Plasma Interactions

“…The higher CH 4 conversions with the plasma result from smaller CH 4 partial pressure than CO 2 partial pressure. 20,22,24 However, the DBD only run showed CH 4 conversions almost identical to those obtained using a porous SiO 2 diluent and/or Al 2 O 3 (Al 2 O 3 −DBD, Figure 4b). …”

“…Ni supported on γ-Al 2 O 3 (Ni/Al 2 O 3 ) was chosen as a catalyst because of its high activity for this reaction. [22][23][24]26,39 Additionally, to systematically investigate C−H activation, we controlled the CH 4 reforming by varying the reaction environment, bulk temperature, and/or DBD plasma power. This Letter highlights the experimental results obtained by performing a series of Ni/Al 2 O 3 −DBD plasma-enhanced CH 4 reforming reaction runs, which can have significant impact on designing new plasma-assisted catalytic processes.…”

“…The 20 wt % Ni was selected based on previous studies that showed this to be an optimal loading in DBD plasma-assisted CH 4 reforming, 22 whereas the 1 wt % of Ni loading was selected for the kinetic evaluation discussed later. 4,46−48 We operated a series of CH 4 reforming reactions under the presence of a DBD plasma in a controlled reaction environment.…”

Synthesis of a Highly Active and Stable Nickel‐Embedded Alumina Catalyst for Methane Dry Reforming: On the Confinement Effects of Alumina Shells for Nickel Nanoparticles

“…Ni-based catalysts have been investigated extensivelyo na ccount of their low cost and high initial activity for the DRM reaction. [12][13][14] However,t he major drawback of Ni-based catalysts is their deactivation at high operating temperatures caused by severe cokinga nd the sinteringo ft he active Ni species. Therefore, many efforts have been devoted to enhance the activity and coke resistance of Ni catalysts for the DRM reaction, such as doping witha dditives/promoters, [15][16][17][18] the selection of suitable supportsw ith reasonable surfacea reas and strongt hermal resistance, [19][20][21][22] and the optimizationo ft he preparation methods.…”

Synthesis gas production with simultaneous CO2 capturing and consuming: Application of chemical looping combustion by employing Fe45‐Al2O3 and Mn40/Mg–ZrO2 oxygen carriers

“…One of the best ideas for this issue is consumption of the captured CO 2 in CLC to create synthesis gas with CO 2 reforming of methane (CDR) or dry reforming of methane (DR) processes. [24][25][26][27][28] Therefore, simultaneous CO 2 capture with CLC and utilization as DR feedstock is an interesting topic. The H 2 /CO ratio of synthesis gas in the DR process is near 1, and it is lower than in the SR process.…”