纳米α-FeOOH催化剂一段法脱除COS和H_2S性能的研究

STUDY ON SIMULTANEOUS REMOVAL OF COS AND H_2S BY USING α-FeOOH NANOPARTICLE

利用均相沉淀法、氨水滴定法制备纳米α FeOOH粒子,以该粒子为活性组分制备催化剂,利用微反-色谱联用活性评价技术,在常压、空速10000h-1、25℃～60℃温度范围内考察了纳米α FeOOH催化剂对COS催化水解的活性。采用热重法对纳米α FeOOH催化剂脱除H2S的性能进行了研究。结果表明:纳米α FeOOH催化剂对COS水解在低温度、大空速下具有高的活性,系列Ⅰ和系列Ⅱ催化剂分别在60℃和40℃～45℃时COS转化率达到100%。在60℃时各种催化剂吸附H2S的能力最强,最高饱和硫容可达到21 72w%。催化剂表面能量分布不均匀,COS催化水解在低温时存在补偿效应。

αFeOOH nanoparticles were prepared using homogeneous precipitation and ammonia titration methods The catalytic activity of the catalysts using αFeOOH nanoparticle as active ingredient for COS hydrolysis were tested by a microreactorchromatography assessing apparatus at the atmospheric pressure in the temperature range from25?℃～60?℃ with gas hourly space velocity 10?000?h-1 The performance of the catalysts for H2S removal was investigated by means of thermal gravimetric method The results show that the nanoparticlebased catalyst is highly active for COS hydrolysis at low temperature at high space velocity Conversion of COS can attain 100% by use of series Ⅰ and Ⅱ catalysts at 60?℃ and 40?℃～45?℃ respectively The highest saturated sulfur capacity for H2S can reach 2172% at 60?℃ Further, it is also observed that the surface energy distribution on the catalysts is heterogeneous and a compensation effect exists