Enhanced synergy by plasma reduced Pd nanoparticles on in-plasma catalytic methane conversion to liquid oxygenates

A dual-function non-thermal plasma system was successfully employed for the Pd nanoparticles preparation, followed by in- plasma catalytic methane partial oxidation to liquid oxygenates and fuels. Non-thermal plasma treated catalyst (P-Pd/SBA-15) was found to possess better surface characteristics to provide the best liquid oxygenates selectivity of 70%, while it restrained to only 58% in only plasma mode

Room-Temperature Toluene Decomposition by Catalytic Non-Thermal Plasma Reactor

The present work reports the decomposition of a model volatile organic compound (VOC), toluene, in a packed-bed dielectric barrier discharge (DBD) plasma reactor. For this purpose, 2.5 wt% MOx/γ-Al2O3 (M = Mn and Co) catalysts prepared by the wet impregnation method were utilized for packing. The influence of varying input toluene concentration (between 50 and 200 ppm) and different packing conditions (surface modifications of γ-Al2O3 with Mn and Co oxides) on the conversion of toluene, product selectivity of CO and CO2, and ozone formation were studied. Surface-modified γ-Al2O3 showed improved CO2 selectivity compared to γ-Al2O3 and bare plasma. CoOx/γ-Al2O3 effectively decomposed 50-ppm toluene (95% at 3.8 W) with about 70% CO2 selectivity. MnOx/γ-Al2O3 and CoOx/γ-Al2O3 displayed the similar conversion effect at higher toluene input. Almost 98% carbon balance and suppressed ozone formation were observed using surface-modified γ-Al2O3, signifying the necessity of integrating metal oxide to achieve effective conversion and maximum selectivity towards the desired products. The mean electron energies and electron energy distribution function were also calculated using BOLSIG+ software. The high-performance packed-bed DBD system packed with supported 2.5% MOx/γ-Al2O3 offers a promising approach using highly active transition metal oxide-based catalysts for VOCs removal. © 1973-2012 IEEE

Ni and Cu oxide supported γ-Al2O3 packed DBD plasma reactor for CO2 activation

The direct activation of undiluted CO2 is carried out in a co-axial dielectric barrier discharge (DBD) reactor. The variation of the electrical discharge parameters and their influence on CO2 decomposition is investigated with the integration of 15 % MO/γ-Al2O3 (M = Ni, Cu) catalyst in the discharge zone. The electrical discharge is found to shift from the filamentary to a combination of surface and micro filamentary discharge on catalyst integration to NTP and also leads to the higher conversion of CO2 than DBD alone. The highest conversion of CO2 (15.7 %) with the energy efficiency of 1.597 mmol/kJ is achieved under CuO/γ-Al2O3 integrated NTP system, whereas the maximum of carbon balance (94.4 %) reaches with 4% CeO2 addition to CuO/Al2O3 catalyst. The oxygen vacancy of the catalyst plays a vital role in improving the performance, especially, the oxygen buffer property of CeO2 facilitates the recombination reaction and contributes to obtaining the highest carbon balance