鉀調(diào)變Mo/SBA-15催化劑用于乙烷選擇氧化制乙醛(英文)

【摘要】：采用兩步浸漬法制備鉀改性的Mo/SBA-15催化劑.采用N2吸附,X射線衍射(XRD),透射電鏡(TEM),紫外-可見(UV-Vis)吸收光譜,拉曼(Raman)光譜,NH3程序升溫脫附(NH3-TPD),CO2程序升溫脫附(CO2-TPD),H2程序升溫還原(H2-TPR)等手段表征催化劑的物理化學(xué)性質(zhì).研究結(jié)果表明,在Mo0.75/SBA-15中添加K之后,有新物種鉀鉬酸鹽生成,并且當(dāng)K/Mo的摩爾比不同時(shí),鉬物種的存在狀態(tài)也不同.添加鉀之后,催化劑的活性和總?cè)?甲醛、乙醛、丙烯醛)的選擇性均有所提高,并且受鉀的添加量影響.在575°C時(shí),在K0.25-Mo0.75/SBA-15催化劑上醛的收率可高達(dá)8.5%(摩爾分?jǐn)?shù)). 【作者單位】： 中國石油大學(xué)(北京)理學(xué)院 重質(zhì)油國家重點(diǎn)實(shí)驗(yàn)室;
【關(guān)鍵詞】： 乙烷選擇氧化 K改性催化劑 Mo氧化物 乙醛 SBA-介孔材料
【基金】：supported by the National Natural Science Foundation of China(21376261,21173270,21177160) Natural Science Foundation of Beijing,China(2142027) National High-Tech Research and Development Program of China(863)(2013AA065302) Specialized Research Fund for the Doctoral Program of Higher Education,China(20130007110007)~~
【分類號】：TQ224.124
【正文快照】： 1 IntroductionSupported molybdenum oxide catalyst is one kind of effectivecatalysts used widely for the selective oxidation of ethane toethylene and oxygenates.1-3The catalytic performances of sup-ported molybdenum-based catalysts will certainly depend o

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