Here in this study, we laid great stress on a development of sustainable waste-to-energy (WtE) platform via CO₂-cofeeding catalytic pyrolysis of macadamia nutshell (MNS) at mild temperature region. To this end, one-stage and two-stage (non-catalytic/catalytic) pyrolysis of MNS was performed to establish the fundamental relationship of temperature effect on syngas formation. The formation of gaseous pyrolysates was substantially enhanced when two-stage pyrolysis of MNS was applied, and second heating zone isothermally ran at 700 °C. Such the enhanced generation of gaseous pyrolysates from two-stage MNS pyrolysis of MNS was likely due to temperature-driven cracking of volatile organic compounds (VOCs). Also, catalytic two-stage pyrolysis of MNS was performed at lower isothermal running temperature (500 °C) over Ni/SiO₂ and Co/SiO₂. The enhanced formation of syngas (H₂ and CO) was observed from catalytic pyrolysis of MNS. Therefore, pyrolysis of MNS over Ni/SiO₂ or Co/SiO₂ could be a reliable platform for enhancing syngas formation at mild temperature (≤ 500 °C) under CO₂ environment. In addition, all experimental findings suggested that the use of CO₂ is beneficial in the WtE platform, and the use of CO₂ could be a practical climate change mitigation measure.

在此研究中，我们着重强调了通过CO ₂开发可持续的废物转化为能源（WtE）平台的方法适量温度下共同进料的澳洲坚果壳（MNS）催化热解。为此，进行了MNS的一阶段和两阶段（非催化/催化）热解，以建立温度对合成气形成的基本关系。当进行MNS的两步热解时，气态热解产物的形成显着增强，并且第二加热区在700°C等温运行。由MNS的两步MNS热解产生的气态热解产物的这种增强生成可能是由于挥发性有机化合物（VOC）的温度驱动裂解所致。同样，在较低的等温运行温度（500°C）下，在Ni / SiO ₂和Co / SiO _2上进行MNS的催化两步热解。合成气（H ₂MNS的催化热解观察到了CO和CO）。因此，MNS在Ni / SiO ₂或Co / SiO _2上的热解可能是在CO ₂环境下在温和的温度（≤500°C）下增强合成气形成的可靠平台。此外，所有实验结果都表明，在WtE平台上使用CO ₂是有益的，并且使用CO ₂可以作为一种切实可行的缓解气候变化的措施。