Ni^(2+)对Cu^+-13X分子筛动态吸附脱硫性能的影响  

Effects of Ni^(2+) on dynamic adsorption desulfurization performance of Cu^+-13X molecular sieve

作　　者：周林[1] 张强[1] 居沈贵[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2015年第1期8-13,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(21176118)

摘　　要：采用液相离子交换法制备Cu+-13X和Ni2+/Cu+-13X分子筛吸附剂,运用X线衍射仪(XRD)、扫描电子显微镜(SEM)和傅里叶红外光谱仪(FT-IR)等对样品进行表征。在常温和常压下,通过固定床吸附实验研究Cu+-13X和Ni2+/Cu+-13X对含有噻吩(TP)、2-乙基噻吩(2-ETP)的双组分模拟汽油的动态吸附脱硫性能。结果表明:Ni2+/Cu+-13X分子筛中Ni2+质量分数为1.54%时,Ni2+/Cu+-13X分子筛吸附脱硫效果最佳。动态吸附实验过程中,噻吩类硫化物与2种吸附剂之间均存在π配位作用,且噻吩与2-乙基噻吩之间存在竞争吸附,而Ni2+可以增大Cu+-13X吸附剂对2-乙基噻吩的吸附选择性;负载的Ni可以作为一种助剂,增加Cu+-13X吸附剂对噻吩类硫化物的吸附量,在相同的实验条件下,经Ni2+改性后的Cu+-13X对噻吩和2-乙基噻吩的穿透吸附量和饱和吸附量分别增加了66.9%、35.5%和24.4%、18.2%。To investigate the effects of transition metal ions Ni^2＋ on the dynamic adsorption desulfurization performances of Cu^＋-13X molecular sieve, Cu^＋-13X and NiZ＋/Cu^＋-13X adsorbents were prepared by liquid phase ion exchange method and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and Fourier transform infrared spectroscopy （FT-IR）. The performances of adsorbents for thiophene （TP） and 2-ethyl thiophene （2-ETP） were investigated by the dynamic adsorption at room temperature and atmosphere pressure. Results showed that the best adsorption desulfurization performances of NiE＋/Cu^＋-13X could be obtained with 1.54% of the Ni〉 mass fraction.In the dynamic adsorption experiments, there was 7r complexation between adsorbents and thiophenie sulfur. Ni^2＋ could increase the adsorption selectivity of Cu^＋-13X adsorbent for 2-ETP.The load of Ni^2＋could be used as an auxiliary component to increase the adsorption content of Cu^＋-13X molecular sieve for thiophenie sulfur. Under the same experimental conditions, the breakthrough capacity and the saturation capacity of Cu^＋-13X modified by Ni^2＋ for TP and 2-ETP were increased to 66.9% ,35.5% and 24.3%, 18.2%, respectively.

关 键 词：过渡元素金属离子 脱硫 动态吸附 Cu^+-13X分子筛 噻吩类硫化物 

分 类 号：TQ424.25[化学工程] TE624.54[石油与天然气工程—油气加工工程]