Iron(III) Nitrate Nonahydrate,乙二胺四乙酸,Ammonium Bicarbonate 以 水 用作溶剂,化学反应生成乙二胺四乙酸铁铵
参考文献:Surface Speciation And Alkane Oxidation With Highly Dispersed Fe(III) Sites On Silica
标题:Surface Speciation And Alkane Oxidation With Highly Dispersed Fe(III) Sites On Silica
摘要:When Highly Dispersed,Supported Fe Oxides Are Selective Alkane Oxidation Catalysts,But New Syntheses Are Required To Reliably Produce Such Materials. Here,Highly Dispersed,Supported Fe3+ Catalysts Are Prepared Via Incipient Wetness Impregnation Of Sio2 With Aqueous Fe Complexes Of Ethylenediaminetetraacetic Acid (Feedta),Followed By Calcination. With Na+ Countercations,Uv-Visible Diffuse Reflectance Spectra Are Entirely Below 300 Nm And H-2 Temperature-Programmed Reduction Only Shows Reduction At Similar To 630 Degrees C For All Loadings Up To 2.15 Wt%,The Maximum Loading For A Single Impregnation Cycle. These Characteristics Indicate Isolated Sites Not Seen For Fe(No3)(3) Precursors Even At 0.3 Wt%. Nh4+ Countercations Lead To Amorphous Oxide Oligomers And A Minority Species With Unusual Reducibility At 310 Degrees C. Countercations Produce 'Single-Site' Behavior In Adamantane Oxidation Using H2O2 With A Specific Turnover Frequency Of 9.2 +/-0.8 Ks(-1),Constant For All Fe Loadings And Approximately 10 Times Higher Than That Of Other Well-Dispersed Fe/sio2 Materials. Similar Turnover Frequencies Are Obtained When Counting Only The Highly Reducible Species On The Nh4+-Derived Catalyst,Allowing These Sites To Be Tentatively Assigned As Small,Undercoordinated Clusters That Are Both Easily Reduced And Participate In Alkane Oxidation,Reminiscent Of Fe-Exchanged Mfi Zeolites. (C) 2011 Elsevier Inc. All Rights Reserved.
Doi:10.1016/j.Jcat.2011.01.007