【摘要】 提出了一种改进催化剂活性和 C+5烃选择性的方法 ,利用原位红外光谱、TPSR和费 -托合成反应考察了催化剂的还原、分散、吸附与反应行为的关系 .研究表明 ,载体处理的差异决定了 CO在催化剂表面上的吸附形态 ,钴负载在氨修饰氧化铝上有利于桥式 CO吸附 ,而醋酸改性氧化铝则增进了金属钴与载体之间的相互作用 ,催化剂以线形吸收态为主 .CO加氢反应表明 ,氨修饰氧化铝负载钴催化剂能促进活性和 C+5烃选择性的提高 ,而醋酸修饰氧化铝可抑止钴催化剂的活性和碳链增长 .更多还原

【Abstract】 The influence of chemically-modified alumina on the adsorption and reaction behavior of Co catalysts was investigated by in situ FTIR, TPSR and Fischer-Tropsch synthesis. The adsorption of CO was determined by the alumina support treated in acid/base media. For the Co catalyst supported onto the ammonia-modified alumina, more bridged-form CO appeared, while the linear-form CO for the acetic acid-modified alumina was dominant. The bridged-form CO mostly participated in CO hydrogenation. CO hydrogenation showed that the Co catalyst supported onto the ammonia-modified alumina favored to increase the catalytic activity and C + 5 selectivity, and however, the Co catalyst supported onto the acetic acid-modified alumina suppressed the activity and the carbon chain growth.更多还原