论文部分内容阅读
分别通过溶胶-凝胶法、浸渍法制备Cu/活性炭(AC)水解催化剂,考察了不同制备方法对水解脱硫性能的影响。利用XRD、BET、SEM等对载体及催化剂进行表征,分析了预处理对AC表面性质及不同制备方法对脱硫效率的影响,并探讨了水解脱硫的机理。结果表明,浸渍法所制备的水解催化剂活性优于溶胶-凝胶法制备的催化剂,在通过预处理增大了AC的比表面积、丰富了AC的孔道结构的基础上,浸渍法能均匀地将活性组分分散在载体表面及其孔道中,而溶胶-凝胶法制备的催化剂活性组分主要覆盖在载体的表面,不能有效进入孔道内,造成脱硫效率下降。在反应温度80℃、羰基硫浓度1.33g/m~3、空速1500h~(-1)、氧化铜质量分数为5%时,浸渍法制备的水解催化剂具有较高的硫容,可达29mg S/g。
The Cu / Activated Carbon (AC) hydrolysis catalysts were prepared by sol-gel method and impregnation method respectively. The effects of different preparation methods on the desulfurization performance were investigated. The catalysts and catalysts were characterized by XRD, BET and SEM. The effect of pretreatment on the surface properties of AC and the effect of different preparation methods on the desulfurization efficiency were analyzed. The mechanism of the desulfurization by hydrolysis was also discussed. The results showed that the hydrolysis catalyst prepared by impregnation method was superior to the catalyst prepared by sol-gel method. Based on the fact that the pretreatment increased the specific surface area of AC and enriched the pore structure of AC, The active component is dispersed in the carrier surface and its channel, while the active component of the catalyst prepared by the sol-gel method mainly covers the surface of the carrier and can not effectively enter the channel, resulting in the decrease of the desulfurization efficiency. When the reaction temperature was 80 ℃, the carbonyl sulfur concentration was 1.33g / m ~ 3, the space velocity was 1500h ~ (-1) and the mass fraction of copper oxide was 5%, the hydrolysis catalyst prepared by impregnation method had a higher sulfur content of 29mg S / g.