采用不同钾源制备低温耐硫变换催化剂Mo-Co-K/Al2 O3,通过XRD、N2吸附-脱附法和微反评价等研究钾源对催化剂的钾流失率、孔结构及反应过程中钾硫酸盐化的影响.结果表明,以K2 SO4为钾源的催化剂钾流失率最大,活性最低.KNO3和KOH对拟薄水铝石的胶溶能力较强,易形成小孔径结构的催化剂.K2 SiO3可以有效避免催化剂中钾在反应过程中的硫酸盐化.
Mo-Co-K/Al2 O3 low temperature sulfur-tolerant water-gas-shift catalysts were prepared by using different K sources. The effects of K sources on K leaching and pore structure of the catalysts and K sulfa-tion during the reaction were investigated by XRD,N2 adsorption-desorption and catalyst evaluation. The results showed that the catalyst prepared by using K2 SO4 as K source possessed the highest K leaching and the lowest activity. KNO3 and KOH exhibited stronger ability to peptize the pseudo-boehmite,which resulted in the formation of the catalyst with smaller pore structure. K2 SiO3 could effectively avoid the sulfation of potassium in the catalyst during the reaction.