Chuayjumnong Sunisa, Karrila Seppo, Jumrat Saysunee, Pianroj Yutthapong
Major in Energy Technology, Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University Hatyai Campus 15 Karnjanavanich Road Hat-Yai Songkhla 90110 Thailand.
Faculty of Science and Industrial Technology, Prince of Songkla University Suratthani Campus 31 Moo 6, Makhamtia Muang Suratthani 84000 Thailand
RSC Adv. 2020 Aug 28;10(53):32058-32068. doi: 10.1039/d0ra04966b. eCollection 2020 Aug 26.
In this study, the effects of two microwave absorbers (MWAb) or catalysts, namely activated carbon (AC) and palm oil fuel ash (POFA), were investigated in microwave pyrolysis of oil palm shell (OPS). The results show similar trends and ranges of the dielectric properties for both MWAbs when measured using a network analyzer with an open-end probe at 2.45 GHz from room temperature to 100 °C. However, according to the Brunauer-Emmett-Teller (BET) method, AC has a larger specific surface area (SSA) and pore volume than POFA. The higher SSA of the AC allows more molecules of gas or liquid substances to be attached on its surfaces than on POFA. This adsorption does not change the structure of AC or POFA. Therefore, on using AC the phenol content was higher than with POFA, as observed from GC-MS peak areas. Both MWAbs had absorbed liquid or gas molecules that may adhere to the surfaces either physically or chemically (or by both types of mechanisms) facilitating bonding to form different molecules. However, phenol derivatives, overall chemical compositions, and product yields were similar for these two MWAbs, according to ANOVA.
在本研究中，研究了两种微波吸收剂（MWAb）或催化剂，即活性炭（AC）和棕榈油燃料灰（POFA），在油棕壳（OPS）微波热解中的作用。结果表明，当使用带有开口探针的网络分析仪在2.45 GHz下从室温到100°C测量时，两种微波吸收剂的介电性能呈现相似的趋势和范围。然而，根据布鲁诺尔-埃米特-泰勒（BET）方法，AC的比表面积（SSA）和孔体积比POFA大。AC较高的比表面积使得气体或液体物质的分子比在POFA表面上更易附着在其表面。这种吸附不会改变AC或POFA的结构。因此，从气相色谱-质谱（GC-MS）峰面积观察到，使用AC时苯酚含量高于使用POFA时。两种微波吸收剂都吸收了可能通过物理或化学方式（或通过两种机制）附着在表面的液体或气体分子，促进键合形成不同的分子。然而，根据方差分析（ANOVA），这两种微波吸收剂的苯酚衍生物、总体化学成分和产物产率相似。
