Animal manure contains a variety of organic materials that can be used for synthesis of value-added biofuels and chemicals. To maximize the carbon recovery from animal manure waste, this study focused on consecutive valorization of horse manure into furfural and syngas (H₂ and CO). Acid hydrolysis/dehydration of horse manure was employed to extract furfural, and the residue after furfural extraction was valorized into syngas and bio-oil through CO₂-assisted pyrolysis. In acid treatment process, the levulinic acid and furfural were produced from horse manure, and the maximum yield (3.68 wt%) of furfural was achieved at 0.5 M H₂SO₄ (40 wt% based on hemicellulose content). Horse manure residue was further converted into bio-oil and syngas under N₂/CO₂ environments. Under CO₂ atmosphere, gas phase homogeneous reactions were occurred, which simultaneously reduced CO₂ and oxidized bio-oil showing enhanced CO formation (18 times higher comparing to pyrolysis under N₂). The homogeneous reaction also resulted in decrease of aromaticity in bio-oil. To enhance the reaction kinetics of the homogeneous reaction and thermal cracking of bio-oil under CO₂, catalytic pyrolysis was performed in the presence of Ni/SiO₂ catalysts. The catalytic pyrolysis improved syngas (H₂ and CO) production more than one order of magnitude higher, comparing to pyrolysis without Ni catalyst. All the experimental findings suggested that horse manure and CO₂ could be used as raw materials for production of value-added chemicals and syngas.

动物粪便含有多种有机材料，可用于合成高附加值的生物燃料和化学品。为了最大限度地从动物粪便废物中回收碳，本研究侧重于将马粪连续增值为糠醛和合成气（H ₂和 CO）。采用马粪酸水解/脱水法提取糠醛，糠醛提取后的残渣通过CO ₂辅助热解转化为合成气和生物油。在酸处理过程中，以马粪为原料生产乙酰丙酸和糠醛，0.5 MH ₂ SO _{4 时}糠醛产率最高（3.68 wt%）（基于半纤维素含量为 40 重量%）。马粪残渣在N ₂ /CO ₂环境下进一步转化为生物油和合成气。在 CO ₂气氛下，发生气相均相反应，同时还原 CO ₂和氧化的生物油，显示出增强的 CO 形成（比 N ₂下的热解高 18 倍）。均相反应也导致生物油的芳香性降低。为了提高CO ₂下生物油均相反应和热裂解的反应动力学，在Ni/SiO ₂催化剂存在下进行催化热解。催化热解改进了合成气（H ₂和 CO) 的产量比没有 Ni 催化剂的热解高一个数量级以上。所有的实验结果表明，马粪和CO ₂可以作为生产高附加值化学品和合成气的原料。