CAJ | 학술논문

采用等体积浸渍法制备了V2O5/TiO2催化剂，并用硫酸对其改性得到HS-V2O5/TiO2（HS为硫酸）催化剂，利用H2-TPR，NH3-TPD，XRD，UV-Vis DRS方法对催化剂进行了表征，并将其用于甲醇选择性氧化制二甲氧基甲烷（DMM），研究了硫酸改性对催化剂的还原性、酸性、物相及催化性能的影响。表征结果显示，硫酸改性对V2O5/TiO2催化剂中V2O5的分散性和还原性的影响较小，但能显著提高催化剂的酸性和酸量。实验结果表明，适量硫酸改性能显著提高催化剂的甲醇转化率和DMM选择性。以SO42-和V2O5负载量均为10%（w）的HS-V2O5/TiO2为催化剂时，在甲醇与O2的摩尔比为2、液态空速为1200 h-1、常压、反应温度为150℃的条件下，甲醇转化率为70.52%、DMM选择性高达91.92%，明显高于未改性的V2O5/TiO2催化剂。
채용등체적침지법제비료V2O5/TiO2최화제，병용류산대기개성득도HS-V2O5/TiO2（HS위류산）최화제，이용H2-TPR，NH3-TPD，XRD，UV-Vis DRS방법대최화제진행료표정，병장기용우갑순선택성양화제이갑양기갑완（DMM），연구료류산개성대최화제적환원성、산성、물상급최화성능적영향。표정결과현시，류산개성대V2O5/TiO2최화제중V2O5적분산성화환원성적영향교소，단능현저제고최화제적산성화산량。실험결과표명，괄량류산개성능현저제고최화제적갑순전화솔화DMM선택성。이SO42-화V2O5부재량균위10%（w）적HS-V2O5/TiO2위최화제시，재갑순여O2적마이비위2、액태공속위1200 h-1、상압、반응온도위150℃적조건하，갑순전화솔위70.52%、DMM선택성고체91.92%，명현고우미개성적V2O5/TiO2최화제。
V2O5/TiO2 catalysts were prepared through impregnation and then were modified by treating with H2SO4 to prepare HS-V2O5/TiO2(HS:H2SO4) catalysts. The two kinds of catalysts were characterized by means of H2-TPR,NH3-TPD, XRD and UV-Vis DRS. Their catalytic activities for the selective oxidation of methanol to dimethoxymethane(DMM) were investigated. The influences of the H2SO4 modification on the redox and acidic properties,and catalytic performance of the catalysts were studied. The results showed that,after the H2SO4 modification,the dispersity and redox property of the vanadium species not changed but the acidity was greatly improved. For HS-V2O5/TiO2 modified with appropriate amount of H2SO4,the methanol conversion and DMM selectivity were significantly promoted. Under the conditions of molar ratio of methanol to oxygen in feed 2,LHSV 1 200 h-1, normal pressure,150℃,HS-V2O5/TiO2 with SO42-loading 10%(w) and V2O5 loading 10%(w) as the catalyst,the methanol conversion and DMM selectivity reached 70.52% and 91.92%,respectively.