要点1.Raman光谱结果显示,烯烃和H2O2反应过程中形成W-过氧结构(W-(η2-O2))在动力学上影响生成环氧化产物,随后在质子化表面位点发生水解生成二醇产物分子;随后二醇分子通过脱质子反应生成α-羟基酮,在H2O2亲核进攻过程中生成醛产物和水。 要点2.通过原...
Raman scattering experiments show that this behavior can be explained by a reduction of the number of sp 3 -coordinated carbon atoms. Conductivity measurements support the structural model. From in situ resistance measurements during the deposition process we derive a percolation threshold of 1.2 nm ...
热催化学术QQ群:741409795光催化学术QQ群:582590624电催化学术QQ群:1025856252均相催化与酶催化QQ群:871976131多孔材料学术QQ群:813094255同步辐射丨球差电镜丨FIB-TEM原位XPS、原位XRD、原位Raman、原位FTIR加急测试李老师 学研汇技术经理158 2732 3927...
Raman spectra results further testified that Al2O3 obviously improves the stability of glass structure and reduces the generation of non- bridged oxygen atoms (Si-O-H), which results in a lower reaction activity with steam of the aluminosilicate melt, therefore, significantly improving the ...
The morphology, crystalline phases, and compositions are characterized by field-emission scanning electron microscope, energy dispersive X-ray spectroscope, X-ray diffraction, and Raman spectroscopy. The electrocatalytic behaviors of this NiCu/Al 2 O 3 /NCN composite material for hydrogen evolution ...
采用沉积-沉淀法制备了固溶体CeO2-MOx(M=La3+,Ca2+)改性的Pd/γ-Al2O3催化剂,利用XRD、Raman和XPS对催化剂进行了表征.结果表明,金属(M)离子进入CeO2的晶格,形成CeO2-MOx固溶体,Raman谱上463cm-1处对应于Ce—O键的F2g对称伸缩振动强度降低.其中,样品Pd/γ-Al2O3-CeO2-CaO在615cm-1处出现一小...
Structure and Dynamics from Time Resolved Absorption and Raman Spectroscopy Spectroscopy is the study of interaction between electromagnetic radiation with matter. To understand the architecture of atoms and molecules we use many spectroscopic techniques. For example X-rays are used to determine crystal st...
热催化学术QQ群:741409795 光催化学术QQ群:248292372 电催化学术QQ群:1025856252 均相催化与酶催化QQ群:871976131 多孔材料学术QQ群:813094255 广告 同步辐射丨球差电镜丨FIB-TEM 原位XPS、原位XRD、原位Raman、原位FTIR 加急测试 刘老师 156 3737 0593 w...
结合尿素辅助水热和蒸发诱导自组装方法,制备了一系列V2O5-LnO-Al2O3(LnO分别为La2O3、CeO2、Pr6O11、Nd2O3或Yb2O3)钒基复合氧化物催化剂,其中V2O5质量分数为9%,助剂质量分数为7%。采用N2吸脱附、X射线衍射(XRD)、拉曼光谱...
the concentration of Na2O increases,resulting in the glass transition temperature decreases from685ħto 622ħ.When the(Al2O3+P2O5)concentration decreases to22%(mole fraction),a crystallization peak appears and the onset crystallization temperature gradually decreases.The intensity of the Raman ...