Application of a micro-channel reactor for process intensification in high purity syngas production via H2O/CO2 co-splitting

A stainless steel micro-channel reactor was tailor-made to an in house-design for process intensification propose. The reactor was used for a two-step thermochemical cycles of H2O and CO2 co-splitting reaction, in the presence of La0.3Sr0.7Co0.7Fe0.3O3 (LSCF). LSCF was coated inside the reactor using wash-coat technique. Oxygen storage capacity of LSCF was determined at 4465 mmol/g, using H2-TPR technique. H2O-TPSR and CO2-TPSR results suggested that a formation of surface hydroxyl group was the cause of H2O splitting favorable behavior of LSCF. Optimal operating reduction/oxidation temperature was found at 700 degrees C, giving 2266 mmol/g of H2, 705 mmol/g of CO, and 67% of solid conversion, when the H2O and CO2 ratio was 1 to 1, and WSHV was 186,000 mL/g.h. Activation energy of H2O spitting and CO2 splitting was estimated at 87.33 kJ/mol, and 102.85 kJ/mol The pre exponential factor of H2O splitting and CO2 splitting was 595.24 s-1 and 698.79 s-1, respectively. (c) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

A stainless steel micro-channel reactor was tailor-made for the two-step thermochemical cycles of H2O and CO2 co-splitting reaction, using La0.3Sr0.7Co0.7Fe0.3O3 (LSCF) coating. The LSCF with surface hydroxyl groups showed favorable behavior in H2O splitting, with optimal operating temperature at 700 degrees C. The activation energy for H2O and CO2 splitting was estimated, with H2O splitting having a pre-exponential factor of 595.24 s-1 and CO2 splitting having a pre-exponential factor of 698.79 s-1.