摘要
以Zr改性的氧化硅、氧化铝为载体,制备了浆态床Co基费-托(F-T)合成催化剂,采用N2物理吸附-脱附、H_2-TPR、CO化学吸附、XRD、SEM、还原度、吡啶吸附-红外光谱等手段表征催化剂的结构和性质,并对催化剂进行了微反活性评价。结果表明:大孔径和无酸性的氧化硅载体有利于提高Co分散度、金属表面积和还原度,对应催化剂具有更高的活性和C_5^+烃类选择性;氧化硅的孔径越大,催化剂的Co分散度与金属表面积越大;催化剂的酸性越弱,产物的C5+烃类选择性越高;载体不影响催化剂的失活速率,但氧化硅载体催化剂初始反应速率明显高于氧化铝载体催化剂。
Cobalt-based catalysts supported on silica and alumina were prepared respectively and tested by a slurry-bed Fischer-Tropsch synthesis reactor. These catalysts were characterized by N2-physisorption, H2-TPR, CO chemisorption, XRD, SEM, pyridine adsorption infrared spectroscopy and reduction degree. The results show that the silica support with larger pore size and acid-free benefits the dispersion of Co, larger surface area and reduction degree of the catalysts, resulting in higher activity and C5＋ selectivity. It is found that for silica support catalyst the larger the pore size, the larger the dispersion and surface area of metal Co;the weaker the acidity,the higher the C5＋ selectivity. The results indicate that support does not affect the catalyst deactivation rate,but the initial reaction rate of silica cata- lyst is significantly higher than the alumina catalyst.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2017年第6期7-13,共7页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司合同项目(S110119)
关键词
费-托合成
钴基催化剂
浆态床
载体
活性
选择性
Fischer-Tropsch synthesis
cobalt-based catalysts
slurry-bed reactor
support
activi ty
selectivity
