Li Hetong, Zhang Yuchun, Fu Peng, Wei Ranran, Li Zhiyu, Dai Lei, Zhang Andong
School of Agricultural Engineering and Food Science, Shandong University of Technology Zibo 255000 China
RSC Adv. 2022 Aug 24;12(37):24014-24025. doi: 10.1039/d2ra04303c. eCollection 2022 Aug 22.
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-FeO/AlO 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 (), water/carbon ratio (/), and loading () on hydrogen content (HL) and hydrogen selectivity (). The OCs were characterized by XRD, XPS, SEM/EDX-mapping, TEM, and H-TPR to determine their physicochemical properties. XPS shows the Fe phase highly interacted with the AlO supporting matrix by forming Fe aluminates in NiO-FeO/AlO. The (85.33%) and HL (78.41%) were obtained under the optimal conditions = 600 °C, / = 1.0 mol mol and = 0. A hydrogen content fluctuation within 4% was obtained under = 700 °C, / = 1.0 mol mol, and = 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.
铁基氧载体（OCs）由于具有出色的抗积碳性能、低毒性和高活性，被广泛应用于化学链蒸汽重整（CLSR）中。在本研究中，开发了一种可被燃料轻易还原并被空气再氧化的纳米NiO-FeO/Al₂O₃铁基OC，用于甘油CLSR。它通过共沉淀和浸渍法合成。基于二次回归正交模型，建立了二次多项式函数，以研究温度（T）、水碳比（S/C）和负载量（L）对氢气含量（HL）和氢气选择性（S）的影响。通过XRD、XPS、SEM/EDX映射、TEM和H-TPR对OCs进行表征，以确定其物理化学性质。XPS表明，在NiO-FeO/Al₂O₃中，Fe相通过形成铁铝酸盐与Al₂O₃载体基质高度相互作用。在最佳条件T = 600℃、S/C = 1.0 mol/mol和L = 0下，获得了S（85.33%）和HL（78.41%）。在T = 700℃、S/C = 1.0 mol/mol和L = 2.5%的条件下，氢气含量波动在4%以内，这意味着由于添加了Ni，循环稳定性良好。本研究为CLSR系统中高效氧载体的开发提供了依据。
