Plasma Assisted Catalytic Conversion of CO2 and H2O Over Ni/Al2O3 in a DBD Reactor

Abstract

We present an innovative approach for reacting carbon dioxide and water to give syngas by combining heterogeneous catalysis and non-thermal plasma techniques. This approach utilizes an abundant water and nickel catalyst, and mitigates the thermodynamic penalty by using a Dielectric Barrier Discharge (DBD) plasma reactor. Argon dilution was used in the experiment to reduce the exothermic recombination of hydrogen and oxygen, which is considered as the major hurdle for H 2 O conversion. As a result, the syngas ratio was dramatically improved from 0.07 to 0.86. In addition, the conversions of CO 2 and H 2 O were improved by packing Ni/γ-Al 2 O 3 catalysts into the DBD reactor. The yields of H 2 and CO were up to 13.8% and 5.6% respectively. The conditions for plasma catalysis and the catalyst characterization are presented and discussed.

Carbon Nanosheets Synthesis in a Gliding Arc Reactor: On the Reaction Routes and Process Parameters

“…The abundance of C 2 in Ar-containing plasmas can be attributed to the available pathways for C 2 production, resulting from the energy transfer between Ar* species with ethylene or acetylene species in Eqs. (6,10). This is in correspondence with the opinions in other studies [53,54].…”

“…The possible dissociation routes for benzyl radicals are presented as an example in Eqs. (10)(11)(12), since the production of benzyl radicals are more favorable due to the low reaction enthalpy (84.4 kcal/mol) compared with phenyl [51]. Then the radicals and intermediate products further dissociate to carbon species or recombine to form various aromatic chemicals based on the reaction conditions as studied in reports [51,52], followed by carbonization process under the impact of electrons and Ar* species or directly flowing away with carrier gas.…”

“…The research of non-thermal plasma has received increasing attentions in different areas such as CO 2 conversion [9,10], nitrogen fixation [11,12], VOC decomposition [13,14] and bio-medical applications [15,16]. The reactive species such as energetic electrons, radicals and ions provide the possibility to achieve the high conversion of reactants at atmospheric pressure and relatively low temperatures.…”

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

“…[4] Sector CO 2 sourceEmissions [Gt] electricity carbon-basedp owerp lants 12.4 heavy industry productiono fcement, limestone,a nd hydrogen 3.9 transport road > air > ship > rail 6.0 > 0.9 > 0.8 > 0. [16][17][18] Thermocatalytic CO 2 conversion is also well known. Capturing CO 2 ,e ither from flue gases of industrial processes or directly from the atmosphere,i so ne such option.…”

“…[15] Plasma and plasma catalytic reactions are also gaining attention, especially CO 2 splitting and dry reforming of methane (DRM). [16][17][18] Thermocatalytic CO 2 conversion is also well known. For instance, DRM with CO 2 is used to produce syngas, which is then used for the production of hydrocarbonso ra lcohols through the Fischer-Tropsch synthesis (FTS).…”