Aurud Pronprom, Srifa Atthapon, Koo-Amornpattana Wanida, Assabumrungrat Suttichai, Wongsakulphasatch Suwimol, Fukuhara Choji, Ratchahat Sakhon
Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom, 73170, Thailand.
Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand.
Sci Rep. 2024 Aug 26;14(1):19782. doi: 10.1038/s41598-024-70503-6.
In this study, the improvement of heat transfer was applied to eliminate hotspots of a highly exothermic reaction, Fischer-Tropsch synthesis (FTS), by means of two facile methods: (I) adding high thermal conductive materials media diluted in catalysts (SiC and Al chips), and (II) using structured reactors equipped with well-designed structured catalysts with advantages of heat dissipation/removal. The 20%Co/SiO catalyst powder prepared by simple impregnation was employed for constructing structured catalysts and granular packed bed catalysts. The structured catalyst was prepared by coating method of Co/SiO slurry on an aluminum spiral and plate substrate. The catalytic performance of as-prepared catalysts was then tested for FTS in a fixed-bed reactor at 210-230 °C, 20 bar. Both gaseous and liquid products were collected and analyzed. The heat transfer improvement of packed bed catalytic system and structured catalytic system were compared and discussed. As a result, the structured catalytic system with spiral structured catalyst can provide the best improvement of heat/mass transfer, resulting in enhanced diesel selectivity, though the oil production rate was unsatisfactory. Meanwhile, among the packed bed catalytic systems, SiC media possessed the best heat removal material, producing the highest oil yield. In addition, the fresh and spent catalysts were analyzed by several techniques including TEM, SEM, XRD, BET, ICP-OES, H-TPR, and TGA to relate the physicochemical properties of the prepared catalysts and its FTS performance.
在本研究中，通过两种简便方法将传热改进应用于消除强放热反应费托合成（FTS）的热点：（I）添加稀释在催化剂中的高导热材料介质（碳化硅和铝片），以及（II）使用配备精心设计的结构化催化剂且具有散热/排热优势的结构化反应器。通过简单浸渍制备的20%Co/SiO催化剂粉末用于构建结构化催化剂和颗粒填充床催化剂。结构化催化剂通过将Co/SiO浆料涂覆在铝螺旋和板状载体上的方法制备。然后在固定床反应器中于210 - 230°C、20巴的条件下测试所制备催化剂对FTS的催化性能。收集并分析气态和液态产物。比较并讨论了填充床催化系统和结构化催化系统传热的改进情况。结果表明，带有螺旋结构化催化剂的结构化催化系统能够实现最佳的传热/传质改进，从而提高柴油选择性，尽管产油率并不理想。同时，在填充床催化系统中，碳化硅介质是最佳排热材料，并产生了最高的产油率。此外，通过几种技术（包括透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线衍射（XRD）、比表面积分析仪（BET）、电感耦合等离子体发射光谱仪（ICP - OES）、程序升温还原（H - TPR）和热重分析（TGA））对新鲜和使用过的催化剂进行分析，以关联所制备催化剂的物理化学性质及其FTS性能。
