The huge generation of animal manures from livestock industries has resulted in detrimental environmental effects such as soil and stream contaminations in line with emissions of greenhouse gases (i.e., CH₄ and CO₂). To alleviate the environmental problems from the animal manure waste, this study proposed a new option for disposal of hen manure waste and its valorization as energy and catalyst. To make this platform more environmentally sound, CO₂ was used as a feedstock to control the pyrogenic products (biochar, syngas, and biocrude) from HM. CO₂ contributed to more thermal cracking of volatile matters (VMs) evolved from HM pyrolysis into syngas in reference to pyrolysis in N₂. In detail, enhanced CO production from gas phase homogeneous reactions (HRs) between CO₂ with VMs was observed. To improve the reaction kinetics for syngas formations, HM biochar was used as a catalyst. HM biochar substantially expedited the syngas formation due to presence of alkaline species. The catalytic capability of HM biochar was nearly the half of Ni catalyst, though the price of HM is a few orders of magnitude lower. This offers that CO₂-assisted pyrolysis with HM biochar could be considered an environmentally and economically viable way for syngas formation from biomass waste.

畜牧业产生的大量动物粪便已导致有害的环境影响，例如土壤和溪流污染，与温室气体（即CH ₄和CO ₂）的排放量一致。为了减轻动物粪便中的环境问题，本研究提出了一种新的处理方法，用于处理粪便中的粪便并将其作为能源和催化剂进行增值。为了使该平台更环保，CO ₂被用作控制HM的热解产物（生物炭，合成气和生物原油）的原料。相对于N _2中的热解，CO ₂有助于从HM热解演变为合成气的挥发性物质（VM）的更多热裂解。。详细地，观察到由CO ₂与VM之间的气相均相反应（HR）产生的CO提高。为了改善合成气形成的反应动力学，将HM生物炭用作催化剂。HM生物炭由于存在碱性物质而大大加快了合成气的形成。HM生物炭的催化能力几乎是Ni催化剂的一半，尽管HM的价格要低几个数量级。这提供了用HM生物炭进行CO ₂辅助热解可以被认为是从生物质废物形成合成气的环境和经济上可行的方法。