การสังเคราะห์และลักษณะสมบัติของซีโอไลต์จากเถ้าลอยถ่านหินสำหรับการขจัดซัลเฟอร์ของเชื้อเพลิงเหลว

• Main Author: ชัชวาล ฉัตรรัตนนนท์
• Other Authors: ชวลิต งามจรัสศรีวิชัย
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 2006
• Subjects: ซีโอไลต์; เถ้าถ่าน; เชื้อเพลิงเหลว; ซิลิกา; สารประกอบซัลเฟอร์
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:35291
• Institution: Chulalongkorn University

Coal fly ash (CFA) from Mae Moh coal was used as a source of silica and alumina for zeolites synthesis such as sodalite, gismondine and cancrinite. The type of silica source had no effect on zeolites synthesis. When colloidal silica was added to yield SiO₂/Al₂O₃ ratio greater than 3, gismondine was formed whereas below this ratio, sodalite was formed. Zeolites had better crystallinity whenH₂O:SiO₂ ratio was in the range of 40 to 80. When NaOH:SiO₂ ratio was greater than 4, zeolite had lower crystallinity. For hydrothermal treatment, sodalite and gismondine were formed at 100 ℃ and cancrinite was formed at 150 ℃. The static condition gave better zeolite formation than stirring condition. Gismondine had the highest crystallinity and surface area (111.54 m2/g). The synthesized zeolites from CFA were used as molecular sieves to adsorb organic sulfur. To compare adsorption capacity, thiophene in hexane as sulfur model was tested at various conditions. At optimum condition, ratio of adsorbent:solution = 2:5 and 60 ℃, the gismondine gave the thiophene removal of 43.02 %.