改性凹凸棒用于FCC汽油的吸附脱硫

ADSORPTIVE DESULFURIZATION OF FCC GASOLINE BY MODIFIED ATTAPULGITE

采用改性凹凸棒黏土为载体,混合法制备了Ti O2-凹凸棒黏土复合型脱硫剂(Ti O2-GATB),用于FCC汽油吸附脱硫,考察了脱硫剂活性组分种类、活性组分含量、活化温度、活化时间,脱硫剂用量、脱硫温度、脱硫时间对脱硫率的影响;并利用红外光谱(FT-IR)、光电子能谱(XPS)等手段进行表征和分析。结果表明,采用600℃活化4 h制备的负载5%(质量分数)Ti O2的凹凸棒黏土脱硫剂(5%Ti O2-GATB),在脱硫温度40℃、脱硫时间1 h的条件下,40 mL FCC汽油加5 g脱硫剂的脱硫效果最佳;经二次脱硫,FCC汽油中的硫质量分数由1100μg/g降至141μg/g,脱硫率达87.18%。在该复合材料中,Ti O2颗粒间不发生团聚,与凹凸棒黏土结合牢固。

Titanium dioxide coated attapulgite（TiO2-GATB） was prepared via composite approach with modified attapulgite as the carrier and characterized by Fourier infrared spectrometer（FT-IR）,X-ray photoelectron spectroscopy（XPS）,which was used as the desulfurizer for desulfurization of FCC gasoline.The effects of the type and content of active component in desulfurizer,activation temperature and time of desulfurizer,desulfurizer dosage,desulfurization temperature and time on desulfurization rate of FCC gasoline were studied.The results indicated that the highest desulfurization rate was achieved when the 40 mL FCC gasoline was treated at 40℃ for 1 h with 5 g 5%TiO2-GATB actived at 600℃ for 4 h.The sulfur mass fraction in FCC gasoline was reduced from 1100 μg/g to 141 μg/g after twice desulfurizations to reach the desulfurization rate of 87.18%.In TiO2-GATB desulfurizer TiO2 grains were not reunited and there was firm combination between TiO2 and attapulgite.