• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Metal nickel nanoparticles in situ generated in rice husk char for catalytic reformation of tar and syngas from biomass pyrolytic gasification
【24h】

Metal nickel nanoparticles in situ generated in rice husk char for catalytic reformation of tar and syngas from biomass pyrolytic gasification

机译：稻壳炭中原位生成的金属镍纳米粒子用于生物质热解气化焦油和合成气的催化重整

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

This paper aims to propose a novel catalytic pyrolytic gasification technology for the in situ conversion of tar and syngas, accompanied by the silica-based nickel nanoparticles generated in situ and the highly dispersed rice husk char (RHC), namely RHC Ni. Partially oxidized nickel oxides (i.e., NiO) in the carbon matrix of biochar can be carbothermally reduced to metallic nickel (Ni-0) nanoparticles by reducing gases (e. g., CO) or carbon atoms during biomass pyrolysis. Moreover, due to its strong reducibility, the addition of sodium borohydride (NaBH4) can significantly promote the generation of Ni-0 by the reduction of NiO, improving the biochar's catalytic activity. An ultra-low tar yield can be achieved by pyrolysis of RH Ni and RH Ni-B at 750 degrees C, in terms of the high tar conversion efficiencies of 96.9% and 98.6%, respectively, compared with the pyrolysis of raw RH. It is noteworthy that the condensable tar could be catalytically reformed into the small molecules of non-condensable tar or gases, which contributes to improving the syngas fuel characteristics in the favor of power generation systems, corresponding to the lower heating value (LHV) of syngas increasing from 10.25 to 11.32 MJ m(-3). In addition, the increase of the polymolecular Ni-0 was most possibly caused by the disproportionation reaction and strong reducibility of NaBH4. In addition, the produced RHC Ni showed a good performance for the catalytic conversion of tar (conversion efficiency, 96.5%) through co-pyrolysis with biomass. After deactivation, the waste RHC Ni might be easily regenerated via thermal treatment or directly catalytically gasified into the applicable syngas, accompanied by the production of the silica-based nickel nanoparticles.
机译：本文旨在提出一种新的催化热解气化技术，用于焦油和合成气的原位转化，以及原位生成的二氧化硅基镍纳米粒子和高度分散的稻壳炭（RHC Ni）。通过在生物质热解过程中还原气体（例如CO）或碳原子，可将生物炭碳基质中的部分氧化的镍氧化物（即NiO）碳热还原为金属镍（Ni-0）纳米颗粒。此外，由于其强大的还原性，硼氢化钠（NaBH4）的添加可通过还原NiO显着促进Ni-0的生成，从而改善生物炭的催化活性。相对于原料RH的热解，通过将RH Ni和RH Ni-B在750℃下热解，焦油转化率分别达到96.9％和98.6％，可以实现超低的焦油收率。值得注意的是，可冷凝的焦油可以催化重整成不可冷凝的焦油或气体的小分子，这有助于改善合成气的燃料特性，有利于发电系统，这对应于较低的合成气热值（LHV）从10.25增加到11.32 MJ m（-3）。另外，多分子Ni-0的增加很可能是由NaBH4的歧化反应和强还原性引起的。另外，所产生的RHC Ni通过与生物质的共热解表现出良好的焦油催化转化性能（转化效率为96.5％）。失活后，废RHC Ni可能易于通过热处理进行再生，或直接催化气化成适用的合成气，同时生产二氧化硅基镍纳米粒子。

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