scholarly journals High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water–Gas Shift Reactor

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2591 ◽  
Author(s):  
M. M. Sarafraz ◽  
Mohammad Reza Safaei ◽  
M. Jafarian ◽  
Marjan Goodarzi ◽  
M. Arjomandi
Keyword(s):  
Supercritical Water ◽  
Water Gas Shift ◽  
Molar Ratio ◽  
Minimization Method ◽  
Syngas Production ◽  
Nitrogen Dilution ◽  
Supercritical Water Gasification ◽  
Gasification Plant ◽  
Water Gas

A thermodynamic assessment is conducted for a new configuration of a supercritical water gasification plant with a water–gas shift reactor. The proposed configuration offers the potential for the production of syngas at different H2:CO ratios for various applications such as the Fischer–Tropsch process or fuel cells, and it is a path for addressing the common challenges associated with conventional gasification plants such as nitrogen dilution and ash separation. The proposed concept consists of two reactors, R1 and R2, where the carbon containing fuel is gasified (in reactor R1) and in reactor R2, the quality of the syngas (H2:CO ratio) is substantially improved. Reactor R1 is a supercritical water gasifier and reactor R2 is a water–gas shift reactor. The proposed concept was modelled using the Gibbs minimization method with HSC chemistry software. Our results show that the supercritical water to fuel ratio (SCW/C) is a key parameter for determining the quality of syngas (molar ratio of H2:CO) and the carbon conversion reaches 100%, when the SWC/C ratio ranges between two and 2.5 at 500–1000 °C.

Copper-Based Water Gas Shift Catalysts for Hydrogen Rich Syngas Production from Biomass Steam Gasification

2017 ◽  
Vol 31 (11) ◽  
pp. 12932-12941 ◽  
Author(s):  
Charlotte Lang ◽  
Xavier Sécordel ◽  
Claire Courson
Keyword(s):  
Steam Gasification ◽  
Water Gas Shift ◽  
Syngas Production ◽  
Water Gas

scholarly journals CO2 utilization for combined gasification and sorption enhanced water-gas shift for syngas production of biochar

2020 ◽  
Vol 736 ◽  
pp. 022006
Author(s):  
Supanida Chimpae ◽  
Suwimol Wongsakulphasatch ◽  
Supawat Vivanpatarakij ◽  
Thongchai Glinrun ◽  
Fasai Wiwatwongwana ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Co2 Utilization ◽  
Syngas Production ◽  
Water Gas

The Reverse Water-Gas Shift Reaction and the Synthesis of Mixed Alcohols over K/Cu-Zn Catalyst from CO2 Hydrogenation

2013 ◽  
Vol 772 ◽  
pp. 275-280 ◽  
Author(s):  
Shang Gui Li ◽  
Hai Jun Guo ◽  
Hai Rong Zhang ◽  
Jun Luo ◽  
Lian Xiong ◽  
...  
Keyword(s):  
Space Velocity ◽  
Product Distribution ◽  
Water Gas Shift ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Reverse Water Gas Shift ◽  
Rwgs Reaction ◽  
Water Gas ◽  
Mixed Alcohols

The K/Cu-Zn catalyst has been synthesized by the co-precipitation method coupling with impregnation method and the catalytic performances for the reverse water gas shift (RWGS) reaction and mixed alcohols synthesis from CO2 hydrogenation have been investigated. The catalytic activity and product distribution depend strongly on reaction temperature, pressure, space velocity and the molar ratio of H2/CO2. These results indicated that the optimal conditions for CO2 hydrogenation over K/Cu-Zn catalyst were as follows: 350 K, 6.0 MPa, 5000 h-1 and H2/CO2 = 3.0, under which the selectivity of CO and mixed alcohols reach 84.27 wt% and 7.56 wt%, respectively. The outstanding performances for RWGS reaction and mixed alcohols synthesis of K/Cu-Zn catalyst can be due to the well dispersion of Cu active component.

Thermodynamic Analysis for the Production of Hydrogen through Sorption Enhanced Water Gas Shift (SEWGS)

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Miguel Escobedo Bretado ◽  
Manuel D Delgado Vigil ◽  
Virginia H Collins Martinez ◽  
Alejandro López Ortiz
Keyword(s):  
Thermodynamic Analysis ◽  
Hydrogen Concentration ◽  
Reaction System ◽  
Equilibrium Analysis ◽  
Water Gas Shift ◽  
Molar Ratio ◽  
Atmospheric Conditions ◽  
Production Of Hydrogen ◽  
Catalyzed Reactions ◽  
Water Gas

A thermodynamic analysis for the process concept of hydrogen production based on the combination of the water gas shift (WGS) and CO2 capture reactions (Absorption Enhanced Water Gas Shift, SEWGS) is presented. The chemical equilibrium analysis of this reaction system was performed to select the proper CO2 absorbent among: calcined dolomite (CaO•MgO), Li4SiO4 and Na2ZrO3 to be used in the process. Results indicate that the use of Na2ZrO3 produced the highest hydrogen concentration among absorbents studied. Results also revealed that the maximum hydrogen concentration (97% mol) can be achieved with a feed molar ratio of CO/Na2ZrO3/H2/O = 1/1/2 at 500°C at atmospheric conditions. The use of a catalyst for such processes may not be needed, since the high temperature at which these reactions are proposed may promote homogeneous non-catalyzed reactions. However, if the combination of both reaction kinetics (WGS and carbonation) are not fast enough to reach equilibrium, a new non-conventional WGS catalyst may be needed.

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