氧化锆负载型活性炭催化水解COS和CS_2

Research on catalytic hydrolysis of carbonyl sulfide and carbon disulfide over ZrO_2 modified activated carbon

以椰壳活性炭为载体,采用浸渍法制备ZrO_2负载型活性炭催化剂,利用BET,XRD,XPS等手段对催化剂进行表征,考察了ZrO_2负载量、焙烧温度、相对湿度、氧含量、反应温度、气态空速等因素对催化剂催化水解COS和CS_2的影响。表征结果显示,反应后生成的硫和硫酸盐沉积在活性炭上,堵塞了活性炭的微孔,毒化了活性中心,从而使水解转化率下降。实验结果表明,w(Zr O2)=5.0%、焙烧温度500℃条件下制备的催化剂,在反应温度60℃、相对湿度19%、氧含量为1.0%(φ)、气态空速5 000 h-1、COS质量浓度1.6 mg/L、CS2质量浓度0.1 mg/L时具有较高的同时水解COS和CS_2的活性;COS和CS_2同时水解转化率最高,100%转化率分别持续630 min和570 min。

A series of coconut shell-based active carbon catalysts loaded by Zr O_2 were prepared by incipient-wetness impregnation method and characterized by BET,XRD,XPS. The effects of Zr O_2 contents,calcinations temperatures,reaction temperature,O_2 content,relative humidity and gas GHSV were also discussed respectively.The characterization results showed that the reaction products were sulfur and sulfate ion,which accumulated on the activated carbon＇s surface and had negative effects on the catalyst by poisoning the active hydroxyl groups. The experimental results showed that catalysts with 5.0%（w） Zr O_2 calcined at 500 ℃ had superior activity for the simultaneous catalytic hydrolysis of COS and CS_2. The optimal purification properties reach at reaction temperature of 60 ℃,oxygen content of 1.0%（φ） and relative humidity of 19%,GHSV was 5 000 h-1,the concentration of COS and CS_2 were 1.6 mg/L and 0.1 mg/L,100% COS conversion and CS_2 conversion are observed for about 630 min and 570 min respectively.