...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Nio/al_2o_3 Oxygen Carriers For Chemical-looping Combustion Prepared By Impregnation And Deposition-precipitation Methods
【24h】

Nio/al_2o_3 Oxygen Carriers For Chemical-looping Combustion Prepared By Impregnation And Deposition-precipitation Methods

机译：浸渍和沉积沉淀法制备的Nio / al_2o_3氧气载体用于化学循环燃烧

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ni-based oxygen carriers (OC) with different NiO content were prepared by incipient wet impregnation, at ambient (AI), and hot conditions (HI) and by deposition-precipitation (DP) methods using y-Al_2O_3 and α-Al_2O_3 as supports. The OC were characterized by BET, Hg porosimetry, mechanical strength, TPR, XRD and SEM/EDX techniques. Reactivity of the OC was measured in a thermogravimetric analyzer and methane combustion selectivity towards CO_2 and H_2O, attrition rate, and agglomeration behavior were analyzed in a batch fluidized bed reactor during multicycle reduction-oxidation tests.rnXRD and TPR analysis showed the presence of both free NiO and NiAl_2O_4 phases in most of the OC. The interaction of the NiO with the alumina during OC preparation formed NiAl_2O_4 that affected negatively to the OC reactivity and methane combustion selectivity towards CO_2 and H_2O during the reduction reaction. The NiO-alumina interaction was more affected by the support type than by the preparation method used. The NiO-alumina interaction was stronger in the OC prepared on γ-Al_2O_3.rnThe OC were evaluated in the fluidized bed reactor with respect to the agglomeration process. OC prepared by the AI and HI methods with NiO contents up to 25 wt%, OC prepared by the DP method on γ-Al_2O_3 with NiO content lower than 30 wt%, and OC prepared by the DP method on α-Al_2O_3 with a NiO content lower than 26 wt% did not agglomerated. OC that agglomerated showed an external layer of NiO over the particles. It seems that the most important factor affecting to the formation of the external NiO layer on the OC, and so to the agglomeration process, was the metal content of the OC. The attrition rates of the OC prepared using γ-Al_2O_3 as support were higher than the ones prepared using α-Al_2O_3 as support, and in general the attrition rates of all the OC were low.rnThe OC prepared by AI, HI or DP methods on α-Al_2O_3 as support had appropriated characteristics to be used in the chemical-looping combustion process.
机译：采用y-Al_2O_3和α-Al_2O_3作为载体，通过在环境（AI）和高温（HI）下进行初始湿浸渍和沉积沉淀（DP）方法，制备了具有不同NiO含量的Ni基氧载体（OC）。 。 OC的特征在于BET，汞孔隙率法，机械强度，TPR，XRD和SEM / EDX技术。在热重分析仪中测量OC的反应性，并在间歇式流化床反应器中的多循环还原-氧化试验中分析了甲烷对CO_2和H_2O的燃烧选择性，损耗率和附聚行为。rnXRD和TPR分析表明两者均存在大多数OC中都有NiO和NiAl_2O_4相。在OC制备过程中，NiO与氧化铝的相互作用形成了NiAl_2O_4，该NiAl_2O_4对OC反应性和还原反应过程中甲烷对CO_2和H_2O的燃烧选择性具有负面影响。载体类型对NiO-氧化铝相互作用的影响大于所用制备方法的影响。在γ-Al_2O_3上制备的OC中，NiO与氧化铝的相互作用较强。rn在流化床反应器中对附聚过程进行了评估。通过AI和HI方法制备的OC，NiO含量最高为25 wt％，通过DP方法制备的OC，在γ-Al_2O_3上的NiO含量低于30 wt％，通过DP方法制备的OC，在α-Al_2O_3上使用NiO低于26重量％的含量没有结块。凝聚的OC在颗粒上显示出NiO的外层。看来，影响OC上外部NiO层的形成以及影响团聚过程的最重要因素是OC中的金属含量。以γ-Al_2O_3为载体制备的OC的损耗率要高于以α-Al_2O_3为载体制备的OC，一般而言，所有OC的损耗率都较低。作为载体的α-Al_2O_3具有适当的特性，可用于化学循环燃烧过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号