合成气
甲烷
镧
部分氧化
沼气
蒸汽重整
制氢
甲烷转化炉
化学
钙钛矿(结构)
氢
化学链燃烧
二氧化碳重整
化学工程
无机化学
材料科学
氧气
废物管理
有机化学
工程类
作者
Sheraj Z. Sayyed,Prakash D. Vaidya
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2023-11-15
卷期号:37 (23): 19082-19091
被引量:2
标识
DOI:10.1021/acs.energyfuels.3c02769
摘要
Biogas is a renewable energy resource that can be effectively utilized for hydrogen (H2) generation. Chemical looping-steam reforming (CL-SR) of biogas produces syngas and pure H2 in a two-stage redox process using an oxygen carrier (OC). The objective of this study was to evaluate the applicability of the lanthanum-based perovskite OC for CL-SR of biogas and methane. La0.95Ce0.05Ni0.2Fe0.8O3 perovskite was used for reforming biogas and methane in a fixed-bed reactor. Several key features of this OC were studied using nitrogen adsorption–desorption (Brunauer–Emmet–Teller method), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The perovskite and porous structure of the OC were evident from the outcome of SEM and XRD techniques. The presence of lattice oxygen was evident in the XPS spectra. The availability of lattice oxygen facilitated partial oxidation of methane and produced optimal syngas and H2. In a fixed bed, the material (2 g) was reduced in the 750–850 °C range using methane (flow of 20–40 mL/min). At 850 °C, the syngas ratio (H2/CO) was 2.3 mol/mol, while the values of H2 and CO yields were 67.6 and 49.5%, respectively. Upon reduction with biogas, the yield values improved to 79 (H2) and 62% (CO). The subsequent oxidation step using steam resulted in a H2-rich product. The chosen La-based perovskite OC was stable for 20 redox cycles, and the average values of the syngas ratio and yields of H2 and CO were 1.5, 60, and 52%. The purity of H2 during the oxidation step over 20 cycles was 95%. Thus, the chosen OC was attractive for the CL-SR process.
科研通智能强力驱动
Strongly Powered by AbleSci AI