基于层状氢氧化物衍生复合氧载体的生物质化学链气化实验研究
Chemical looping gasification of biomass based on the oxygen carrier derived from the layered double hydroxide (LDH) precursor
查看参考文献23篇
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文摘
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通过低饱和共沉淀法合成了类水滑石结构的层状氢氧化物(Layered Double Hydroxide,LDH)前驱体,经煅烧获得衍生Cu /Al /Zn、Cu /Al /Ni、Cu /Al /Ni /Zn高分散复合氧载体。采用XRD、XRF、H_2-TPR、SEM及BET等分析手段对氧载体的结构及反应性能进行了表征,并通过固定床反应器开展了氧载体与生物质化学链气化实验。结果表明,合成的三种前驱体都具有典型的水滑石特征衍射峰,且层板稳定。Cu /Al /Zn前驱体层间厚度为0.264 2 nm,Ni~(2+)引入后,层间距减小。前驱体煅烧后形成的复合氧载体中元素含量与制备试剂基本一致。氧载体中Zn、Ni元素的引入可提升CuO的反应活性,降低H_2还原的反应温度,Zn元素与Cu具有更好的协同作用。Cu /Al /Ni /Zn氧载体在固定床化学链气化中具有较好的碳转化率和气体产率,其碳转化率为82.03%。反应后氧载体比表面积为5.995 m~2 /g,具有较好的可再生性与抗烧结性,是生物质化学链气化反应较为理想的氧载体。 |
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其他语种文摘
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Layered double hydroxide (LDH) precursors with different metal elements were prepared by coprecipitation method at constant pH value;highly dispersed Cu /Al /Zn,Cu /Al /Ni and Cu /Al /Ni /Zn mixed metal oxygen carriers were obtained by calculation of the corresponding precursors. These oxygen carriers were characterized by XRD,XRF,H_2-TPR,SEM and nitrogen adsorption and their activity in the chemical looping gasification (CLG) of biomass was investigated in a fixed bed reactor. The results indicated that typical hydrotalcite structure appears in the three precursors with stable layer board. The interlayer spacing of Cu /Al /Zn precursor is 0.264 2 nm,larger than that of the Cu /Al /Ni precursor. The oxygen carriers derived from the corresponding precursors display similar elements contents as the preparation reagents. Due to the synergy among various metals,the Cu /Al /Ni /Zn oxygen carrier shows the highest reaction activity and anti-sintering ability. The addition of Ni and Zn has a positive effect on the activity of CuO and reduce its reduction temperature;Zn shows a better synergistic effect than Ni with Cu. The carbon conversion reaches 82.03% for the CLG of biomass with Cu /Al /Ni /Zn as oxygen carrier;the surface area of Cu /Al /Ni /Zn remanis 5.995 m~2 /g after the CLG reaction,suggesting that it could be an ideal candidate for the CLG of biomass. |
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来源
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燃料化学学报
,2016,44(3):349-356 【核心库】
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关键词
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层状氢氧化物
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水滑石
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化学链气化
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氧载体
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生物质
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地址
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中国科学院广州能源研究所, 中国科学院可再生能源重点实验室, 广东, 广州, 510640
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广东机电职业技术学院, 广东, 广州, 510515
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2409 |
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学科
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能源与动力工程 |
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基金
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国家自然科学基金
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广东省科技计划项目
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文献收藏号
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CSCD:5660469
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