焙烧温度对Ni/ZnO/Al2O3深度吸附脱除苯中噻吩性能的影响

Effect ofcalcination temperature on deepadsorbent Ni/ZnO/Al2O3 for desulfurization of thiophene from benzene

采用固相法及尿素沉淀法分别制备NiO和ZnO,以ω(ZnO)∶ω(NiO)∶ω(Al2O3)=0.3∶1∶1混涅成型制备脱硫吸附剂,考察焙烧温度对吸附剂选择性吸附脱除苯中微量噻吩硫化物的影响,并采用XRD、H2-TPR和BET等对吸附剂进行表征。结果表明,前驱体的焙烧温度对吸附剂晶体结构和脱硫性能影响显著,焙烧温度500℃时,吸附剂表面活性位及与载体的相互作用适中,吸附脱硫效果最好。在185℃和1.5 MPa吸附条件下,以含噻吩100 mg·L^-1的苯为原料,吸附剂动态饱和吸附硫容量可达18.4 mg·g^-1,吸附后苯中噻吩浓度不高于0.010 mg·L^-1,表明制备的吸附剂具有较好的吸附脱硫应用前景。

Nano-nickel oxide and nano-zinc oxide were prepared by solid phase method and urea precipitation method.The desulfurization adsorbent was prepared by kneading withω(ZnO)∶ω(NiO)∶ω(Al2O3)=0.3∶1∶1.The effect of calcination temperature on the desulfurization performance of the adsorbent was investigated.Texture properties of the prepared adsorbents were characterized by XRD,H2-TPR,and BET.The results showed that the calcination temperature of the precursor had significant effect on the crystal structure and desulfurization performance of the adsorbent.The adsorbent calcinated at 500℃showed the best desulfurization performance due to suitable interaction between surface active site and the support.When benzene with thiophene content of 100 mg·L^-1 was used as raw material and adsorbed at 185℃ and 1.5 MPa,the saturated adsorption sulfur capacity was up to 18.4 mg·g^-1,and the concentration of thiophene in benzene after adsorption was not higher than 0.010 mg·L^-1,which meant that the prepared adsorbent had good application prospect for desulfurization.