TiO_2和V_2O_5改性Al_2O_3催化剂催化有机硫化物水解的性能

考察了不同改性组分TiO2和V2O5对Al2O3催化剂催化有机硫化物(羰基硫(COS)、CS2)水解性能及抗氧中毒性能的影响。固定床活性评价结果表明,在常压、催化剂装填量10mL、反应温度130℃、空速10000h-1、进料气中有机硫化物和氧气的体积分数分别为1.5×10-4,10%、水气比(即p(H2O)∶p(COS或CS2))为270的情况下,TiO2改性Al2O3催化剂上COS和CS2的转化率分别在70%和40%以上;V2O5改性Al2O3催化剂上COS和CS2转化率分别在40%和30%以上。X射线衍射光谱和傅里叶变换红外光谱表征结果显示,两种催化剂在催化有机硫化物水解前后的晶相没有变化,且使用后催化剂上也未出现单质硫和硫酸盐。说明这两种催化剂都具有较好的抗氧中毒性能,同时TiO2改性Al2O3催化剂对有机硫化物水解的催化性能更好。

Hydrolysis of Organic Sulfide on Aluminum Catalysts with TiO2 and V2O5 Modification

Hydrolysis of organic sulfides(COS,CS2)catalyzed by alumina catalysts modified with TiO2 and V2O5 was investigated in presence of O2.The anti-oxygen-poisoning property of the catalyst was especially under observation.The evaluation of catalyst was carried out in a fixed bed reactor under atmospheric pressure,catalysts volume 10 mL,reaction temperature 130 ℃,space velocity 10 000 h-1,organic sulfide volume fraction at the inlet 1.5×10-4,oxygen volume fraction 10% and p(H2O)∶ p(COS or CS2)270.The steady conversions of COS and CS2 on catalyst modified by TiO2 were 70% and 40%,and on catalyst modified by V2O5 were 40% and 30%,respectively.No change in crystalline forms of the catalysts could be observed after reaction,and no elemental sulfur and sulfate were found.FTIR confirmed the results.The two catalysts can stand oxygen without poisoning.The performance of catalyst modified by TiO2 was better than that modified by V2O5 in hydrolysis of COS and CS2.