CAJ | 학술논문

对 TiO2负载 V2 O5催化剂进行盐酸改性制得了 HC-V/TiO2催化剂,并将其应用于甲醇选择性氧化制二甲氧基甲烷(DMM).V2 O5负载量为10％的催化剂10V/TiO2上,钒氧物种具有良好的分散性.对10V/TiO2进行不同量的盐酸改性制备了 HC-10V/TiO2催化剂,对其进行 XRD、UV-Vis、H2-TPR、NH3-TPD表征.结果表明,适量的盐酸改性能有效改善催化剂的酸性,但对钒氧物种的分散性和还原性没有影响,改性后催化剂的反应活性和稳定性也得到很大提高,甲醇转化率和DMM选择性明显增加.Cl-负载量为4％的催化剂4HC-10V/TiO2在反应温度160℃时,甲醇的转化率为77．60％,DMM 的选择性高达78．31％.
대 TiO2부재 V2 O5최화제진행염산개성제득료 HC-V/TiO2최화제,병장기응용우갑순선택성양화제이갑양기갑완(DMM).V2 O5부재량위10％적최화제10V/TiO2상,범양물충구유량호적분산성.대10V/TiO2진행불동량적염산개성제비료 HC-10V/TiO2최화제,대기진행 XRD、UV-Vis、H2-TPR、NH3-TPD표정.결과표명,괄량적염산개성능유효개선최화제적산성,단대범양물충적분산성화환원성몰유영향,개성후최화제적반응활성화은정성야득도흔대제고,갑순전화솔화DMM선택성명현증가.Cl-부재량위4％적최화제4HC-10V/TiO2재반응온도160℃시,갑순적전화솔위77．60％,DMM 적선택성고체78．31％.
Acid modified catalyst HC-V/TiO2 was prepared by simply treating V2 O5/TiO2 with hydrochloric acid.The catalytic properties of HC-V/TiO2 for selective oxidation of methanol to dimethoxymethane (DMM) were investigated.For the catalyst 10V/TiO2 with V2 O5 loading 10%,the vanadium species have high dispersi-ty.The catalyst 10V/TiO2 was modified with different amount of hydrochloric acid solution.The as-prepared catalysts HC-10V/TiO2 were characterized by XRD,UV-Vis,H2-TPR and NH3-TPD.The results showed that the acidity of catalysts was greatly improved with appropriate acid modification.But the dispersion and redox properties of vanadium species were uneffected.The reaction activity and stability were increased after acid mod-ification.The methanol conversion and DMM selectivity of HC-10V/TiO2 were higher than unmodified catalyst 10V/TiO2 .For the catalyst 4HC-10V/TiO2 with Cl- loading 4%,the methanol conversion and DMM selectivi-ty were 77.60% and 78.31%,respectively.