ผลเชิงเร่งปฏิกิริยาของโลหะแอลคาไล และแอลคาไลน์เอิร์ทที่ดูดซับบนวัสดุเบดต่อการรีฟอร์มน้ำมันทาร์ด้วยไอน้ำ / ชลัท ธีรฐิตยางกูร = Catalytic effects of alkali and alkaline earth metals adsorbed on bed material on tar steam reforming / Chalat Teeratitayanggoon
Alkali and alkaline earth metals (AAEMs) are inherently exist in biomass and also good catalyst for gasification process. However, AAEMs are typically released out of thermochemical process of biomass. This work investigated effect of pyrolysis temperature on release of AAEMs from rice straw and leucaena leucocephala. It found that increase in release of Na and K when pyrolysis temperature increased from 600 to 800 °C. Release of Ca and Mg were rather constant because of strong interaction with SiO2 mineral in char. Nevertheless, previous works have mentioned the AAEMs vapors caused corrosion and slagging for thermochemical process. Therefore, this work investigated adsorption of AAEMs by Al2O3 and SiO2 in order to study feasibility for reducing the problem from the released AAEM (i.e. slag and corrosion) inside reactor. Also, spent bed was studied feasibility in catalytic activity of tar steam reforming. The results revealed that K species were adsorbed more than other metals and adsorption of AAEMs from rice straw by Al2O3 at temperature of 800 °C, carrier gas flow rate of 120 mL/min and under steam atmosphere provided high potassium content, comparing with other biomass and bed. In part of catalytic activity study, it revealed Al2O3 adsorbed AAEMs from rice straw provided positive interaction on carbon conversion into gaseous product and also increased in H2 and CO content via water gas shift and boudouard reaction.
SUBJECT
โลหะอัลคาไล -- การดูดซึมและการดูดซับ
โลหะอัลคาไลน์เอิร์ธ -- การดูดซึมและการดูดซับ
ตัวเร่งปฏิกิริยา
น้ำมันดิน
การแยกสลายด้วยความร้อน
พลังงานชีวมวล
การแปรสภาพชีวมวลให้เป็นก๊าซ
Alkali metals -- Absorption and adsorption
Alkaline earth metals -- Absorption and adsorption