활성탄 담지 몰리브덴 촉매를 이용한 합성가스 직접 메탄화 반응

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 31; no. 5; pp. 419 - 428
• Main Authors: 김성수(SEONG-SOO KIM), 이승재(SEUNG-JAE LEE), 박성열(SUNG-YOUL PARK), 김진걸(JIN-GUL KIM)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2020
• Subjects: 기계공학; Carbon deposit(탄소 침적); Direct methanation(직접 메탄화); Metal dusting(금속 더스팅); Activated charcoal-supported molybdenum catalyst(활성탄 담지 몰리브덴 촉매); Nanoparticle(나노입자)
• ISSN: 1738-7264; 2288-7407

The kinetics of direct methanation over activated charcoal-supported molybdenum catalyst at 30 bar was studied in a cylindrical fixed-bed reactor. When the temperature was not higher than 400℃, the CO conversion increased with increasing temperature according to the Arrhenius law of reaction kinetics. While XRD and Raman analysis showed that Mo was present as Mo oxides after reduction or methanation, TEM and XPS analysis showed that Mo2C was formed after methanation depending on the loading of Mo precursor. When the temperature was as high as 500℃, the CO conversion was dependent not only on the Arrhenius law but also on the catalyzed reaction by nanoparticles, which came off from the reactor and thermocouple by metal dusting. These nanoparticles were made of Ni, Fe, Cr and alloy, and attributed to the formation of carbon deposit on the wall of the reactor and on the surface of the thermocouple. The carbon deposit consisted of amorphous and disordered carbon filaments.