Journal
JOURNAL OF CATALYSIS
Volume 377, Issue -, Pages 224-232Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.07.036
Keywords
Catalytic CO(2 )hydrogenation; Iron based catalysts; Oxygen vacancies; Surface hydroxyl sites; Ethylene synthesis
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Funding
- Jiangsu Province Scientific and Technological Project of China [BK20180449]
- Fundamental Research Funds for the Central Universities of China [30919011218]
- Key Project of Chinese National Programs for Research and Development of China [2016YFC0203800]
- National Natural Science Foundation of China [51578288]
- Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province of China [BY2016004-09]
- Jiangsu Province Scientific and Technological Achievements into a Special Fund Project of China [BA2015062, BA2016055, BA2017095]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions of China
- University of Wyoming
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The study was designed to investigate the catalytic hydrogenation of increasingly concerned CO2 to light olefins including ethylene, propylene and butylene, a series of critically important materials for various chemical syntheses, a win-win scenario for environment and economy. The Fe0.30Co0.15Zr0.30K0.10O1.63 catalyst, presented much poorer surface hydroxyl groups but richer oxygen vacancies (OVs) than the Fe0.60Co0.30K0.10O1.40, displayed light olefin space time yields (STY) of 4.93 mmol.g(cat)(-1).h(-1) at 310 degrees C and 2.0 MPa, which was 33.24% higher than the Fe0.60Co0.30K0.10O1.40 at the same reaction conditions. Extensive characterizations demonstrate that both oxygen vacancies (OVs) and surface hydroxyl groups (-OH) played important roles in the catalytic CO2 hydrogenation to light olefins, while OVs were more critical. OVs on the reduced Fe0.30Co0.15Zr0.45K0.10O1.63 were more active than those on the reduced Fe0.60Co0.30K0.10O1.40, which was very important to the enhancement of the oxygen storage, adsorption and activation of CO2 and thus the direct and efficient conversion of CO2 into CO, an important intermediate for the synthesis of light olefins synthesis. Thus, Fe0.30Co0.15Zr0.30K0.10O1.63 is a promising catalyst for converting CO2 hydrogenation to light olefins. (C) 2019 Elsevier Inc. All rights reserved.
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