Co基超细粒子催化剂用于合成重质烃Ru助剂的作用

LONGCHAIN HYDROCARBONS FROM SYNGAS ON NANOSIZED COBALTBASED CATALYSTS Effect of Ru Promoter

用溶胶凝胶法制备了ＳｉＯ２气凝胶超细粉体及ＺｒＯ２ＳｉＯ２超细复合载体，用浸渍法制备了Ｃｏ／ＺｒＯ２ＳｉＯ２超细粒子催化剂并用干混法制备了ＣｏＲｕ／ＺｒＯ２ＳｉＯ２催化剂．考察了Ｒｕ的添加对Ｃｏ／ＺｒＯ２ＳｉＯ２催化剂的织构、结构、还原、氢脱附及其ＦＴ反应性能的影响．结果表明，Ｒｕ的添加使Ｃｏ２＋更难还原，催化剂活性略有下降，ＣＨ４选择性降低，Ｃ５＋选择性及收率升高；Ｃｏ１％Ｒｕ／ＺｒＯ２ＳｉＯ２催化剂上的烃类产物不遵从ＳｃｈｕｌｚＦｌｏｒｙ分布，在Ｃ９和Ｃ１５有两个最高峰．

SiO_2 aerogel ultrafine powder and ZrO_2SiO_2 ultrafine complex oxide were prepared by solgel method. Co/ZrO_2SiO_2 and CoRu/ZrO_2SiO2 catalysts were prepared by incipient wetness technique and physically mixing method respectively. The effect of Ru additive on texture, structure, reduction, H2 desorption and FT reaction properties of nanosized cobaltbased catalysts was investigated. The results indicate that the Ru promoter makes the reduction of Co2+difficult to take place. The reaction activity of catalyst CoRu/ZrO2SiO2 drops a little comparing with catalyst Co/ZrO2SiO2. The selectivity for CH4 decreases and the selectivity for C5+ increases. The distribution of hydrocarbon products on CoRu/ZrO2SiO2 deviates from SchulzFlory distribtuion, having two peaks at C9 and C15 respectively.