Effects of supports on reduction activity and carbon deposition of iron oxide for methane chemical looping hydrogen generation
Effects of supports on reduction activity and carbon deposition of iron oxide for methane chemical looping hydrogen generation
复制标题
载体对甲烷化学循环制氢氧化铁还原活性和积炭的影响
DOI：
10.1016/j.apenergy.2018.05.082
复制
发表时间：
2018-09
期刊：
影响因子：
11.2
通讯作者：
Wenguo Xiang
中科院分区：
文献类型：
--
作者：
Min Zhu;Shiyi Chen;Ahsanullah Soomro;Jun Hu;Zhao Sun;Shiwei Ma;Wenguo Xiang
化学循环制氢是一项很有前途的技术，它有潜力借助铁基氧载体有效生产氢气并捕获二氧化碳。铁基氧载体的性能，如耐碳性、氧化还原活性和循环稳定性，是CLHG工艺发展的关键因素。在本研究中，通过共沉淀法将四种不同的载体（MgAl2O4、CeO2、ZrO2 和 CeZrO4）与氧化铁结合。在小型流化床反应器中研究了氧载体与甲烷的还原活性、抗碳性和氧化还原稳定性。还通过程序升温还原（TPR）和程序升温氧化（TPO）测试了氧化还原活性和氧转移能力。在还原期间通过甲烷分解反应观察到碳的形成。结果表明，氧载体的碳电阻部分取决于氧传输能力。对于新鲜氧载体，MgAl2O4 的掺入具有更好的抗碳性，因为与碳沉积前的其他载体相比，可以释放更多的晶格氧。经过10次氧化还原循环后，Fe2O3/CeZrO4氧载体表现出最佳的氧传输能力，但Fe2O3/MgAl2O4氧载体的氧传输能力明显下降。此外，比表面积可以显着影响氧载体的还原活性。在还原的氧载体上观察到结晶石墨，这对还原活性产生负面影响，导致氧载体的烧结。
Chemical looping hydrogen generation is a promising technology which has the potential to efficiently produce hydrogen and capture CO2with the aid of iron-based oxygen carriers. The properties of the iron-based oxygen carrier, such as carbon resistance, redox activity, and cycle stability, are critical factors for the development of CLHG process. In this study, four different supports, MgAl2O4, CeO2, ZrO2, and CeZrO4, were incorporated with iron oxide by a co-precipitation method. The reduction activity, carbon resistance and redox stability of the oxygen carriers with methane were investigated in a bench-scale fluidized bed reactor. The redox activity and oxygen transfer capacity were also tested by temperature programmed reduction (TPR) and temperature programmed oxidation (TPO). Carbon formation was observed during the reduction period through the methane decomposition reaction. It was revealed that the carbon resistance of the oxygen carriers was partially determined by the oxygen transfer capacity. For the fresh oxygen carriers, the incorporation of MgAl2O4led to a better carbon resistance because more lattice oxygen can be released compared to the other supports before carbon deposition. After 10 redox cycles, the Fe2O3/CeZrO4oxygen carrier performs the best oxygen transfer capacity, but the oxygen transfer capacity of the Fe2O3/MgAl2O4oxygen carrier reduced obviously. In addition, the specific surface area could dramatically affect the reduction activity of the oxygen carriers. Crystalline graphite was observed on the reduced oxygen carriers, which posed a negative effect on the reduction activity, leading to sintering of the oxygen carriers.
登录
查看更多内容
ZrO2 改性 Ce-Fe 混合氧化物上晶格氧转移将甲烷部分氧化为合成气
影响因子：
15.1
作者：
Li, Kongzhai;Wang, Hua;Wei, Yonggang;Yan, Dongxia
通讯作者：
Yan, Dongxia
影响因子：
1.8
作者：
D. Ghosh;A. K. Roy;A. Ghosh
通讯作者：
D. Ghosh;A. K. Roy;A. Ghosh
影响因子：
2.9
作者：
K. Maj;I. Kocemba
通讯作者：
K. Maj;I. Kocemba
影响因子：
17.6
作者：
In-Hyuk Son;Soonchul Kwon;J. Park;Seung-Jae Lee
通讯作者：
In-Hyuk Son;Soonchul Kwon;J. Park;Seung-Jae Lee
影响因子：
5.3
作者：
K. Murata;Linsheng Wang;M. Saito;M. Inaba;and Isao Takahara;N. Mimura
通讯作者：
K. Murata;Linsheng Wang;M. Saito;M. Inaba;and Isao Takahara;N. Mimura