期刊
RSC ADVANCES
卷 12, 期 37, 页码 24014-24025出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra04303c
关键词
-
资金
- Natural Science Foundation of China [51976112, 51676116, 52130610]
- National Key Research and Development Project of China [2019YFD1100602]
A type of nano NiO-Fe2O3/Al2O3 Fe-based OC was developed for glycerol CLSR, which can be easily reduced and re-oxidized. The study established optimal conditions and demonstrated improved cycle stability with the addition of Ni.
Fe-based oxygen carriers (OCs) are widely used in chemical looping steam reforming (CLSR) due to excellent resistance to carbon buildup, low toxicity, and high activity. In this study, a type of nano NiO-Fe2O3/Al2O3 Fe-based OC that can easily be reduced by fuels and re-oxidized by air was developed for use in glycerol CLSR. It was synthesized by co-precipitation and impregnation. Based on the quadratic regression orthogonal model, a quadratic polynomial function was established to investigate the effects of temperature (T), water/carbon ratio (S/C), and loading (M) on hydrogen content (HL) and hydrogen selectivity (S). The OCs were characterized by XRD, XPS, SEM/EDX-mapping, TEM, and H-2-TPR to determine their physicochemical properties. XPS shows the Fe phase highly interacted with the Al2O3 supporting matrix by forming Fe aluminates in NiO-Fe2O3/Al2O3. The S (85.33%) and HL (78.41%) were obtained under the optimal conditions T = 600 degrees C, S/C = 1.0 mol mol(-1) and M = 0. A hydrogen content fluctuation within 4% was obtained under T = 700 degrees C, S/C = 1.0 mol mol(-1), and M = 2.5%, which means the cycle stability is perfect because of the addition of Ni. This study provides a basis for the development of efficient oxygen carriers in the CLSR system.
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