Biogas reforming for hydrogen-rich syngas production over a Ni-K/Al2O3 catalyst using a temperature-controlled plasma reactor

摘要

Plasma-enhanced catalytic biogas reforming for hydrogen-rich syngas production over a Ni-K/Al2O3 catalyst was investigated using a tabular dielectric barrier discharge non-thermal plasma reactor. To better understand the plasma catalysis synergy at elevated tempera-tures, we compared different reaction modes: plasma catalysis, plasma alone, and catal-ysis alone in a reaction temperature range of 160-400 degrees C. The combination of Ni-K/Al2O3 and plasma produced synergistic effects. Notably, the plasma-catalytic synergy was temperature-dependent and varied at different reaction temperatures. Using plasma catalysis, the maximum conversion of CH4 and CO2 (31.6 and 22.8, respectively) was attained over Ni-K/Al2O3 at 160 degrees C, while increasing the reaction temperature to 340 degrees C noticeably enhanced the H2/CO ratio to 2.71. Moreover, compared to plasma-catalytic biogas reforming at 160 degrees C, increasing the reaction temperature to 400 degrees C suppressed biogas conversion with dramatically reduced coke formation on the Ni-K/Al2O3 surface from 6.81 wt to 3.37 wt.(c) 2022 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).