Abstract A series of Ni/CaO catalysts with different ratios of Ni content were prepared by using an isovolumetric impregnation method. The performance of Ni/CaO catalysts on cyclic CO2 absorption and catalytic pyrolysis of herb residues was investigated by using a thermogravimetry and differential thermal analyzer (TG-DTA) and a fixed micro-bed pyrolysis reactor system. The results of cyclic absorption experiments using Ni/CaO catalysts with different ratios of Ni content showed that the CO2 absorption capability of CaO decreased rapidly with increasing number of cycle, and the addition of Ni increased the anti-deactivation capability of CaO in cyclic CO2 absorption. Among the catalysts, the absorption rate of 10% (wt) Ni/CaO was up to 0.7 in the eighth cycle, which was 22.8% higher than that of pure CaO. The analysis of the catalytic pyrolysis products of herb residues indicated that the addition of CaO and 10% (wt) Ni/CaO resulted in effective removal of CO2 in the gaseous products, significant increase in the lower heating value (LHV), and reduction in the yield of condensable liquids such as tar. Compared with CaO, the addition of Ni increased effective gases production and the heating value of the gaseous product and further decreased the yield of condensable liquids. Under the conditions of 700 °C, 10% (wt) Ni/CaO catalyzed pyrolysis of herbal residues yielded an effective gas production of 325.3 mL/g and the lower heating value of 18.6 MJ/m3.

中文翻译：

---

使用 Ni/CaO 催化剂催化热解药草残渣生产气体

摘要 采用等容浸渍法制备了一系列不同Ni含量比的Ni/CaO催化剂。通过使用热重和差热分析仪（TG-DTA）和固定微床热解反应器系统研究了 Ni/CaO 催化剂对循环 CO2 吸收和草本残留物催化热解的性能。不同Ni含量比的Ni/CaO催化剂循环吸收实验结果表明，CaO的CO2吸收能力随着循环次数的增加而迅速下降，Ni的加入提高了CaO在循环CO2吸收中的抗失活能力. 在催化剂中，10%(wt)Ni/CaO的吸收率在第8次循环时达到0.7，比纯CaO高22.8%。对草本残留物催化热解产物的分析表明，添加 CaO 和 10% (wt) Ni/CaO 可有效去除气态产物中的 CO2，显着增加低热值 (LHV)，并减少焦油等可冷凝液体的产率。与CaO相比，Ni的加入增加了有效产气量和气态产物的热值，进一步降低了可凝液体的产率。在 700 °C 的条件下，10% (wt) Ni/CaO 催化的草药残留物热解产生 325.3 mL/g 的有效气体产量和 18.6 MJ/m3 的较低热值。降低可冷凝液体（如焦油）的产率。与CaO相比，Ni的加入增加了有效产气量和气态产物的热值，进一步降低了可凝液体的产率。在 700 °C 的条件下，10% (wt) Ni/CaO 催化的草药残留物热解产生 325.3 mL/g 的有效气体产量和 18.6 MJ/m3 的较低热值。降低可冷凝液体（如焦油）的产率。与CaO相比，Ni的加入增加了有效产气量和气态产物的热值，进一步降低了可凝液体的产率。在 700 °C 的条件下，10% (wt) Ni/CaO 催化的草药残留物热解产生 325.3 mL/g 的有效气体产量和 18.6 MJ/m3 的较低热值。