Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
Chemosphere. 2022 Jan;287(Pt 3):132220. doi: 10.1016/j.chemosphere.2021.132220. Epub 2021 Sep 8.
The present study investigated the effects of metal loaded spent adsorbent as catalyst for the catalytic pyrolysis of pine needle biomass. Metal active sites (Ni, Fe, Cu, Zn and Mo) were introduced in alumina matrix by wet impregnation process. Non-catalytic and catalytic semi-batch pyrolysis study was carried out at conditions: 550 °C temperature, 50 °C min heating rate and 200 mL min N flow rate. Results indicated significant deoxygenation potential 3.33-35.57% of the applied catalysts towards oxygenated compounds by converting them into their corresponding hydrocarbon (27.70-36.41%) and phenolic (40.41-46.04%) derivatives. Among all the catalysts, Ni/Al and Fe/Al produced the highest quality bio-oil by enriching their carbon content to 62.93 and 60.14% and heating value to 31.41 and 26.86 MJ kg, respectively. Moreover, significant enhancement in their hydrocarbons (36.41 and 36.01% for Ni/Al and Fe/Al, respectively) and phenolic compounds (46.04 and 41.67% for Ni/Al and Fe/Al, respectively) from 9.15% hydrocarbons and 13.32% phenols in non-catalytic bio-oil had also been observed. Presence of CO and CO in the evolved gases also represented the occurrence of deoxygenation reactions during catalytic breakdown. Hydrocarbon and phenol-rich bio-oil can find its application either as a replacement for petroleum fuel or an industrial-grade chemical. Thus, catalysts derived from spent aluminum hydroxide nanoparticle adsorbent can act as an effective substitute for the currently utilized high-cost catalysts in catalytic pyrolysis of biomass.
本研究考察了负载金属的废吸附剂作为催化剂对松针生物质催化热解的影响。金属活性位（Ni、Fe、Cu、Zn 和 Mo）通过湿法浸渍法引入氧化铝基体中。在非催化和催化半分批热解条件下进行研究：温度为 550°C，加热速率为 50°C min，N 流速为 200 mL min。结果表明，通过将含氧化合物转化为相应的烃（27.70-36.41%）和酚（40.41-46.04%）衍生物，所应用的催化剂对氧合化合物具有显著的脱氧潜力 3.33-35.57%。在所有催化剂中，Ni/Al 和 Fe/Al 通过将其碳含量分别富集到 62.93%和 60.14%，并将热值分别提高到 31.41 和 26.86 MJ kg，产生了最高质量的生物油。此外，在非催化生物油中，其烃类（Ni/Al 和 Fe/Al 分别为 36.41%和 36.01%）和酚类化合物（Ni/Al 和 Fe/Al 分别为 46.04%和 41.67%）的含量也显著提高。在演化气体中存在的 CO 和 CO 也代表了在催化分解过程中脱氧反应的发生。富含碳氢化合物和酚类的生物油可以作为石油燃料的替代品或工业级化学品找到应用。因此，来源于废氢氧化铝纳米粒子吸附剂的催化剂可以作为目前用于生物质催化热解的高成本催化剂的有效替代品。
