B_2O_3对Ag/TiO_2-Al2O_3吸附剂的柴油吸附脱硫性能影响（英文）  

Effect of B_2O_3 modified Ag/TiO_2-Al_2O_3 adsorbents on the adsorption desulfurization of diesel

作　　者：李莉达[1,2] 许承志[1,2] 郑美琴[1,2] 陈晓晖[1,2] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福建福州350002 [2]福州大学石油化工学院,福建福州350116

出　　处：《燃料化学学报》2015年第8期990-997,共8页Journal of Fuel Chemistry and Technology

基　　金：supported by the National Natural Science Foundation of China(21376055)

摘　　要：采用浸渍法制备了不同B2O3负载量（e.g.5%～20%（w））的Ag/Ti O2-B2O3-Al2O3吸附剂。以含硫量为245.36 mg（S）/L的商业柴油作为考察对象,常温常压下采用静态评价进行吸附脱硫性能研究。结果表明,B2O3改性后的Ag/Ti O2-Al2O3吸附剂的柴油吸附脱硫活性有了较大提高,当B2O3的负载量为15%时,吸附剂的吸附脱硫活性最高,2%Ag/4%Ti O2-15%B2O3-Al2O3（w）的饱和吸附硫容达到2.36 mg（S）/g吸附剂。这对于未经预处理的商业柴油而言,吸附脱硫活性已经达到较高水平。采用N2物理吸附、O2化学吸附、X射线衍射（XRD）、NH3程序升温脱附（NH3-TPD）、傅里叶红外光谱（FT-IR spectra）、^11B核磁共振（^11B-NMR）等表征手段对不同负载量B2O3改性Ag/Ti O2-Al2O3吸附剂的织构性质、晶相结构和表面酸性的影响进行研究。关联活性测试和表征结果发现,吸附剂的吸附脱硫活性主要与吸附剂的表面弱酸性有关,而B2O3改性在吸附剂表面引入了较多的四配位的BO4物种,能显著增加吸附剂表面弱酸性位点数量,提高吸附剂的吸附脱硫活性。Ag / Ti O2-B2O3-Al2O3 adsorbents with different B2O3loadings（ e. g. 5% ～ 20%（ w）） were prepared by impregnation.Static adsorption tests were carried out by contacting the adsorbents with commercial diesel containing 245. 36 mg（ S） / L sulfur at ambient conditions to investigate the adsorption desulfurization activity. The results showthat Ag / Ti O2-Al2O3 modified by B2O3 exhibits a great enhancement for the adsorption desulfurization activity. When B2O3（ 15%） was loaded,2% Ag /4% Ti O2-15%B2O3-Al2O3（ w） could achieve the best desulfurization activity with a saturation capacity of 2. 36 mg（ S） /g adsorbent. This is a significant achievement regarding the desulfurization efficiency,especially for commercial diesel without pretreatment. The effects of B2O3 on the textural properties,crystal structure and surface acidity properties of the adsorbent were studied by N2-physisorption,O2-chemisorption,X-ray diffraction（ XRD）,temperature-programmed desorption of ammonia（ NH3-TPD）,Fourier transform infrared spectrometer（ FT-IR spectra） and ^11B nuclear magnetic resonance（^11B-NM R） techniques. Correlating the characterizations with the desulfurization activity,it is found that the adsorption desulfurization activity is well related with the amounts of weak acid sites on the adsorbents. B2O3 modification induces larger amounts of BO4 species and improves the surface weak acidity,resulting in a higher adsorption desulfurization activity.

关 键 词：B2O3 Ag基吸附剂 柴油 吸附脱硫 弱酸性位点 

分 类 号：O643[理学—物理化学]