Syngas Production from Combined Steam Gasification of Biochar and a Sorption-Enhanced Water–Gas Shift Reaction with the Utilization of CO2

Abstract

This research aims at evaluating the performance of a combined system of biochar gasification and a sorption-enhanced water-gas shift reaction (SEWGS) for synthesis gas production. The effects of mangrove-derived biochar gasification temperature, pattern of combined gasification and SEWGS, amount of steam and CO 2 added as gasifying agent, and SEWGS temperature were studied in this work. The performances of the combined process were examined in terms of biochar conversion, gaseous product composition, and CO 2 emission. The results revealed that the hybrid SEWGS using one-body multi-functional material offered a greater amount of H 2 with a similar amount of CO 2 emissions when compared with separated sorbent/catalyst material. The gasification temperature of 900 • C provided the highest biochar conversion of ca. 98.7%. Synthesis gas production was found to depend upon the amount of water and CO 2 added and SEWGS temperature. Higher amounts of H 2 were observed when increasing the amount of water and the temperature of the SEWGS system.

Enhanced H2 production through biomass pyrolysis by applying alkaline ceramic lithium cuprate (Li2CuO2) as a bifunctional material

“…Besides, at 450 °C, CO 2 capture kinetics are thermally enhanced, promoting the H 2 production due to the Le Châtelier principle. [32][33][34] However, between 500 and 700 °C H 2 increments may resulted from combining three processes, enhanced by temperature: (i) thermal decomposition of by-products from glucose pyrolysis, 35,36 (ii) oxygen availability from the crystal framework that may induce the decomposition of by-products into H 2 O and CO 2 , the presence of which may promote a reforming reaction, 37,38 and (iii) CO oxidation and capture from this material that may shi the reaction equilibrium to H 2 formation. 33,39 These results are in good agreement with the supplied data in the ESI (see ESI Fig.…”

Enhanced hydrogen production via assisted biomass gasification using lithium manganate as a bifunctional material

“…35,36 Moreover, it has been reported that the addition of different metal oxides or supported metal-particles as catalysts in addition to CO 2 sorbents during the pyrolysis and gasification processes enhance the production and increases the purity of H 2 . 19,37–41…”

“…35,36 Moreover, it has been reported that the addition of different metal oxides or supported metal-particles as catalysts in addition to CO 2 sorbents during the pyrolysis and gasication processes enhance the production and increases the purity of H 2 . 19,[37][38][39][40][41] In this context, alkaline ceramics have demonstrated high capture capabilities for CO 2 and/or bifunctional properties for consecutive processes, such as CO oxidation and subsequent chemisorption. In fact, Li 4 SiO 4 and Na 2 ZrO 3 have been reported as bifunctional catalyst-sorbent materials during the pyrolysis process, enhancing the H 2 production and chemically trapping CO 2 as carbonates.…”

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

“…The thermal conversion of hydrocarbons in the superheated steam medium (at 500-700 • C) can have a number of environmental and technological advantages, such as the neutralization of harmful compounds formed in the steam-gas mixture [17,18] and the improvement of the quality indicators of the condensed liquid hydrocarbons (reduced content of sulfur compounds, ash, changed molecular weight of light hydrocarbons) [19]. In addition, the use of superheated steam as a hydrocarbons conversion agent increases the H 2 content in the resulting synthesis gas: C + H 2 O → CO + H 2 , CH 4 + H 2 O → CO + 3H 2 and CO + H 2 O → CO 2 + H 2 [20][21][22][23]. Efika et al [24] reported that the use of steam as an additional agent for biomass conversion increases the hydrogen concentration in the composition of gas-phase products by 30%.…”