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Prevention of CaO deactivation using organic calcium precursor during multicyclic catalytic upgrading of bio-oil

机译：生物油多环催化升级期间使用有机钙前体预防CAO失活

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摘要

The conversion of biomass wastes into upgraded bio-oil has been successfully implemented by catalytic fast pyrolysis (CFP) with CaO catalyst. The bottleneck of CFP technology is catalyst deactivation. Ex-situ catalytic pyrolysis of biomass wastes with multiple recycling of CaO from different calcium precursors were performed in a continuous fixed-bed at 500 degrees C. The objectives were to intensify the anti-deactivation and regenerative stability of CaO using organometallic precursor, and comprehensively distinguish the effects of calcium precursors on deactivation mechanism in terms of coke yield, coke species, structural and chemical changes et al. The results demonstrated that organic calcium precursor strengthened the recyclability of CaO catalyst during upgrading of bio-oil by showing longer lifetime and better recycling stability. Compared with conventional CaO from Ca(OH)(2) (CH-CaO), the stronger deoxygenation and superior porosity of CaO from organic calcium precursors (Org-CaO) facilitated the removal of coke precursors and suppressed pore plugging. The average coke yields of CH-CaO and Org-CaO were respectively 5.1 and 2.2 g/m(2). Moreover, CH-CaO promoted the aromatization of coke precursors, leading to coke existing in form of hard diamond-like structure. But coke deposited on Org-CaO exhibited softer layered graphite structure and contained more aliphatic matters. After 10 reaction/regeneration cycles, Org-CaO still kept 50% deoxygenation activity whereas CH-CaO showed almost complete deactivation. Organic calcium precursors delayed irreversible deactivation of CaO, since these precursors physically prevented the sintering and agglomeration of CaO, and chemically alleviated the loss of both the strength and density of basic sites on CaO.
机译：用CaO催化剂催化快速热解（CFP）成功地实施了生物质废物的转化液。 CFP技术的瓶颈是催化剂停用。在500摄氏度的连续固定床中，在连续的固定床中进行使用多重再循环的生物质废物的原位催化热解。目的是使用有机金属前体，并全面地加强CAO的抗失活和再生稳定性区分钙前体对焦炭产量，焦炭物种，结构和化学变化等易失活机制的影响。结果表明，通过表示更长的寿命和更好的回收稳定性，有机钙前体在生物油升级期间加强CaO催化剂的可回收性。与来自Ca（OH）（2）（2）（Ch-CaO）的常规CaO相比，来自有机钙前体（ORG-CAO）的CaO的较强的脱氧和优异的孔隙促进了焦炭前体并抑制孔堵塞。 CH-CAO和ORG-CAO的平均焦炭产量分别为5.1和2.2g / m（2）。此外，CH-CAO促进了焦炭前体的芳香化，导致焦炭以硬菱形结构的形式存在。但焦炭沉积在org-cao上表现出较软的分层石墨结构，并包含更多的脂肪族问题。在10次反应/再生循环之后，ORG-CAO仍然保持50％的脱氧活性，而CH-CAO表现出几乎完全失活。有机钙前体延迟不可逆失活的CaO，因为这些前体在物理上防止了CaO的烧结和附聚，并在化学上缓解了CaO上基本位点的强度和密度的损失。

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  • 来源
    《Fuel》 |2020年第jul1期|117692.1-117692.10|共10页
  • 作者

    Yi Linlin; Liu Huan; Li Meiyong; Man Gaozhi; Yao Hong;

  • 作者单位

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Energy & Power Engn Dept New Energy Sci & Engn Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Upgraded bio-oil; CaO; Organic precursors; Deactivation; Regeneration;

    机译：升级的生物油;CAO;有机前体;停用;再生;

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