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在常压下 ,以氧气为氧化剂 ,用两种不同制法的载体分别制备催化剂 (MoO3 ·MxOy/SiO2 ) ,用于甲烷部分氧化反应 ,对比结果表明用醇盐法所制SiO2 (ZSiO2 )做成的催化剂比用市售SiO2 (QSiO2 )做成的催化剂反应活性和选择性好 ,助剂V2 O5加入提高了CH4 转化率和CO2 ,CO选择性 ,降低了HCHO产率和选择性 ,B2 O3 加入提高了CH4 转化率 ,HCHO产率和其选择性 ,降低了CO2 ,CO选择性 ,TPR结果表明载体ZSiO3 的应用减少了载体表面弱酸性位 ,但助剂V2 O5和B2 O3 的加入使MoO3 与ZSiO2 发生了不同的相互作用 ,从而影响了催化剂表面的活性氧物种 ;NH3 TPD结果表明载体ZSiO3 的应用及助剂B2 O3 的加入增加了催化剂表面弱酸性位
Under normal pressure, the catalyst (MoO3 · MxOy / SiO2) was prepared by two different preparation methods using oxygen as the oxidant, respectively, for the partial oxidation of methane. The comparison results show that the use of SiO2 (ZSiO2) The catalyst has better reactivity and selectivity than the catalyst made of commercially available SiO2 (QSiO2). The addition of V2O5 promoter improves the conversion of CH4 and selectivity of CO2 and CO, and reduces the yield and selectivity of HCHO. B2 O3 The addition of CH 4 increased the CH 4 conversion, HCHO yield and selectivity, decreased the CO 2 and CO selectivity. The results of TPR showed that the application of ZSiO 3 decreased the weak acid sites on the support. However, the addition of additives V2 O5 and B2 O3 led to the increase of MoO3 And ZSiO2 have different interactions, which affected the reactive oxygen species on the catalyst surface; NH3TPD results show that the carrier ZSiO3 application and B2O3 additives increased weak acid sites on the catalyst surface