不同载体的镍基氧化锌对噻吩的吸附脱除性能

Adsorptive removal of thiophene over nickel-based ZnO with different supports

采用混捏法制备了以金属氧化物、黏土及分子筛为载体的三类镍基氧化锌吸附剂,采用FT-IR等分析手段进行表征,探讨了其物化性能的差异,并利用微型固定床反应器考察了上述吸附剂对噻吩的吸附脱除性能。结果表明,不同吸附剂对噻吩的吸附效果不同,黏土载体的吸附剂脱硫性能高于金属氧化物载体的脱硫性能,吸附剂的脱硫活性顺序依次为cay-sorb>diatomite-sorb>Al-sorb>Ti-sorb。利用FT-IR对吸附剂的表面酸性进行了表征。结果表明,吸附剂的脱硫性能与其总L酸量有关,总L酸量高的吸附剂脱硫效果较好。分子筛载体吸附剂的脱硫活性顺序依次为MCM-22-sorb>HY-sorb≥Hβ-sorb>H-mordenite-sorb>HZSM-5-sorb。通过比较分子筛载体的孔道结构表明,分子筛载体孔径大小是影响吸附剂脱硫性能的主要因素。

The nickel-based ZnO adsorbents were prepared by mix-kneading method using different supports with metal-oxide,clay and zeolite.The physiochemical properties of the catalysts were characterized using FT-IR.Then the chemical adsorption performance of thiophene on the adsorbents was studied in a fixed bed stainless steel tubular micro-reactor.The results show that the desulfurization performance varies for different adsorbents.The desulfurization performance of adsorbents with clay supports is higher than that of metal-oxide supports.The desulfurization performance decreases in order of clay-sorb diatomite-sorb Al-sorb Ti-sorb.The sulfur removal rate increases with the total Lewis acidity of the adsorbent.The desulfurization performance decreases in the order of MCM-22-sorb HY-sorb ≥ Hβ-sorb H-mordenite-sorb HZSM-5-sorb.By comparing the pore structure of zeolite supports,it shows that the effective pore size of zeolite supports is the key factor to influence the desulfurization activity.