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.
Bibliographical noteFunding 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 .
© 2021 Elsevier Ltd
- Catalyst-sorbent hybrid solid
- High-purity hydrogen
- Hydrotalcite-based catalyst
- Hydrotalcite-like sorbent
- Sorption-enhanced reaction
- Water gas shift reaction
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment