TY - JOUR
T1 - Water gas shift and sorption-enhanced water gas shift reactions using hydrothermally synthesized novel Cu–Mg–Al hydrotalcite-based catalysts for hydrogen production
AU - Lee, Chan Hyun
AU - Kim, Suji
AU - Yoon, Hyung Jin
AU - Yoon, Chang Won
AU - Lee, Ki Bong
N1 - Funding Information:
This work was supported by “Energy Technology Development Business” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Trade, Industry & Energy [ 20182020201260 ] and the Super Ultra Low Energy and Emission Vehicle Engineering Research Center [NRF- 2016R1A5A1009592 ] of the National Research Foundation of Korea (NRF), funded by the Korean government Ministry of Science and ICT .
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - As the interest in environmentally-friendly energy processes increases, many studies have been focused on producing hydrogen as an alternative energy carrier via catalytic reaction processes. Among several potential reaction processes, water gas shift (WGS) reaction has been studied extensively as a typical catalytic reaction for bulk production of hydrogen. Recently, many studies have been conducted on the formation of an easily reducible active components in order to develop novel catalysts having excellent activities at low temperatures for WGS reaction. In this study, new catalysts based on hydrotalcite with unique interlayered structure were prepared by a hydrothermal synthesis and co-precipitation of copper (Cu) for active metal sites. The catalysts synthesized from different precursors showed that the reduction property of Cu was greatly changed according to the mixed oxide structure generated after calcination. Cu–MgHAlH, the hydrotalcite-based catalyst synthesized using hydroxide precursors, showed the highest redox property and the multiple analysis results confirmed that MgAl2O4 spinel structure is attributed to form easily reducible Cu species. Based on these characteristics, Cu–MgHAlH showed excellent catalytic performance in the WGS reactions between 250 and 400 °C, and it was successfully applied to the sorption-enhanced WGS reaction using catalyst-sorbent hybrid solid pellets. Especially, the hydrotalcite-based catalyst has high potential for application to sorption-enhanced reaction processes using molten salt containing CO2 sorbents because the high reduction properties of Cu species are well maintained in the catalyst when mixed with CO2 sorbents.
AB - As the interest in environmentally-friendly energy processes increases, many studies have been focused on producing hydrogen as an alternative energy carrier via catalytic reaction processes. Among several potential reaction processes, water gas shift (WGS) reaction has been studied extensively as a typical catalytic reaction for bulk production of hydrogen. Recently, many studies have been conducted on the formation of an easily reducible active components in order to develop novel catalysts having excellent activities at low temperatures for WGS reaction. In this study, new catalysts based on hydrotalcite with unique interlayered structure were prepared by a hydrothermal synthesis and co-precipitation of copper (Cu) for active metal sites. The catalysts synthesized from different precursors showed that the reduction property of Cu was greatly changed according to the mixed oxide structure generated after calcination. Cu–MgHAlH, the hydrotalcite-based catalyst synthesized using hydroxide precursors, showed the highest redox property and the multiple analysis results confirmed that MgAl2O4 spinel structure is attributed to form easily reducible Cu species. Based on these characteristics, Cu–MgHAlH showed excellent catalytic performance in the WGS reactions between 250 and 400 °C, and it was successfully applied to the sorption-enhanced WGS reaction using catalyst-sorbent hybrid solid pellets. Especially, the hydrotalcite-based catalyst has high potential for application to sorption-enhanced reaction processes using molten salt containing CO2 sorbents because the high reduction properties of Cu species are well maintained in the catalyst when mixed with CO2 sorbents.
KW - Catalyst-sorbent hybrid solid
KW - High-purity hydrogen
KW - Hydrotalcite-based catalyst
KW - Hydrotalcite-like sorbent
KW - Sorption-enhanced reaction
KW - Water gas shift reaction
UR - http://www.scopus.com/inward/record.url?scp=85104082587&partnerID=8YFLogxK
U2 - 10.1016/j.rser.2021.111064
DO - 10.1016/j.rser.2021.111064
M3 - Article
AN - SCOPUS:85104082587
VL - 145
JO - Renewable and Sustainable Energy Reviews
JF - Renewable and Sustainable Energy Reviews
SN - 1364-0321
M1 - 111064
ER -