CAJ | 학술논문

分别用快速燃烧法(RC)、共沉淀法(CP)、浸渍法(IM)和机械混合法(PM)制备了钒钛催化剂,并将其应用于甲醇氧化一步法合成二甲氧基甲烷的反应中.同时采用X射线衍射(XRD)、N2吸附/脱附(BET)、NH_3程序升温脱附(NH_3-TPD),H_2程序升温还原(H_2-TPR)等多种手段对催化剂进行了表征.结果表明RC催化剂上钒的分散度最高,酸中心数最多,同时氧化还原能力较强.甲醇氧化反应结果表明.RC催化剂上甲醇转化率和DMM选择性最高,这可能与RC上较高的钒分散度,较强的氧化还原能力和较多的酸性中心数有关.
분별용쾌속연소법(RC)、공침정법(CP)、침지법(IM)화궤계혼합법(PM)제비료범태최화제,병장기응용우갑순양화일보법합성이갑양기갑완적반응중.동시채용X사선연사(XRD)、N2흡부/탈부(BET)、NH_3정서승온탈부(NH_3-TPD),H_2정서승온환원(H_2-TPR)등다충수단대최화제진행료표정.결과표명RC최화제상범적분산도최고,산중심수최다,동시양화환원능력교강.갑순양화반응결과표명.RC최화제상갑순전화솔화DMM선택성최고,저가능여RC상교고적범분산도,교강적양화환원능력화교다적산성중심수유관.
The vanadia-titania catalysts prepared by the rapid combustion method(RC),copreclpitation method(CP),impregnation method(IM)and the physical mixing method(PM)are applied to the one-step oxidation of methanol to dimethoxymethane.The catalyst slructttre,surface acidity and redox preperdes are characterized by X-ray diffraction(XRD),Raman spectroscopy(LRS),BET surface areatest,NH_3-temperature programmed desorption(NH_3-TPD)and H_2-temperature programmed reduction(H_2-TPR)techniques.The results show that the RC catalyst employs the higheat vanadia dispersion,the maximal number of acid sites and stronger reducibility.The methanol oxidation results show that the methanol conversion and DMM selectivity are the highest on the RC catalyst,which might be related to higher vanadia dispersion,more acid sites and stTonger reducibility.