铁酸锶镧对CH_(4)化学循环转化中Mn_(3)O_(4)氧化还原性能的作用机制  

Action of Strontium Lanthanum Ferrite on the Redox Performance of Mn_(3)O_(4) in the Chemical Looping Conversion of Methane

作　　者：陈彦广[1,2] 倪永明 邓冀童 徐瑞晗 韩洪晶 王海英[1,2] 关宇婷 CHEN Yan-guang;NI Yong-ming;DENG Jitong;XV Rui-han;HAN Hong-jing;WANG Haiying;GUAN Yu-ting(College of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing Heilongjiang 163318,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Chemical Technology,Daqing Heilongjiang 163318,China)

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318 [2]黑龙江省石油与天然气化工省重点实验室,黑龙江大庆163318

出　　处：《当代化工》2023年第4期781-786,805,共7页Contemporary Chemical Industry

基　　金：国家自然科学基金(项目编号:21908021);中国石油科技创新基金项目(项目编号:2021DQ02-0701);黑龙江省高水平人才项目(项目编号:2020GSP17);东北石油大学新能源新领域培育项目(项目编号:XNYXLY202102);东北石油大学青年基金(项目编号:2018QNL-17);东北石油大学引导性创新基金(项目编号:2021YDL-03)。

摘　　要：通过水热合成法制备了MnO_(2),以其作为锰源通过热分解得到Mn_(3)O_(4),采用溶胶凝胶法制备了Mn_(3)O_(4)/La0.8Sr0.2FeO3,将Mn_(3)O_(4)和Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3)在900℃下与体积分数3%的CH_(4)和空气交替接触,模拟化学循环燃烧中的氧化还原过程,研究了Mn_(3)O_(4)和Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3)的氧化还原性能和长期稳定性。结果表明:温度的升高会提高Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3)的还原失重率;纯Mn_(3)O_(4)在10次氧化还原循环后反应性能降低,不适合作为化学循环燃烧的氧载体,而多次氧化还原循环前后Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3)的还原反应活性、稳定性、晶相、元素赋存状态和形貌基本不变。MnO_(2) was prepared by hydrothermal synthesis method,and Mn_(3)O_(4)was obtained by thermal decomposition using MnO_(2) as manganese source.Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3) was prepared by sol-gel method.Mn_(3)O_(4) and Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3) were alternately contacted with 3%CH_(4) and air at 900℃to simulate the redox process in chemical cycle combustion.The results showed that the increase of temperature led to an increase in the reduction weight loss rate of Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3).The reaction performance of pure Mn_(3)O_(4) decreased after 10 redox cycles,so it was not suitable for oxygen carrier for chemical-looping combustion.However,the reactivity,stability,crystal phase,occurrence state and morphology of Mn_(3)O_(4)/La_(0.8)Sr_(0.2)FeO_(3) after multiple redox cycles remained unchanged.

关 键 词：化学循环转化 铁酸锶镧 Mn_(3)O_(4) 氧化还原 

分 类 号：TK16[动力工程及工程热物理—热能工程]