四氟硼酸改性活性炭的制备及其吸附脱除二苯并噻吩性能

Modification of activated carbon with tetrafluoroboric acid and its performance in adsorption desulfurization of dibenzothiophene

摘要: 采用浸渍法制备了四氟硼酸(HBF₄)改性活性炭,并研究了其对模拟油中二苯并噻吩(DBT)的吸附脱除性能。利用傅里叶红外光谱(FT-IR)、差示热分析仪(TG-DTA)、X射线光电子能谱(XPS)以及N₂吸附技术对吸附剂的表面态和孔结构进行了表征,考察了四氟硼酸浓度、热处理温度以及模拟油中DBT浓度对吸附脱硫效果的影响。结果表明,经质量分数0.5%的HBF₄溶液浸渍、140 ℃热处理后,在剂油比1:100条件下,活性炭的吸附容量为352 mg/g,较未改性活性炭提高了72.5%。

Abstract: The activated carbon adsorbent was modified with tetrafluoroboric acid (HBF₄) by impregnation and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and N₂ physisorption. The performance of modified activated carbon in adsorption desulfurization of dibenzothiophene (DBT) in model diesel fuel was investigated and the influences of HBF₄ concentration, calcination temperature and the initial DBT concentration on the sulfur removal efficiency were considered. The results show that the adsorbent modified with 0.5% HBF₄ solution and calcined at 140 ℃ performs best in DBT desulfurization; when the adsorbent/oil ratio is 1:100, the HBF₄-modified adsorbent exhibits an adsorption capacity of 352 mg/g, which is 72.5% higher than that of the unmodified activated carbon.