Silica-confined Cu2O nanoparticles for propylene epoxidation with__molecular oxygen
Silica-confined Cu2O nanoparticles for propylene epoxidation with__molecular oxygen
研究概述
采用再分散–限域策略，将小尺寸低价Cu颗粒封装于二氧化硅壳内，以Cu—O—Si配位及Cs助剂稳定活性位点，调节晶格氧反应性及分子氧活化。优化催化剂直接丙烯环氧化的转化率3.9%、环氧丙烷选择性68%，高于无壳对照的0.6%和42%。
谱图与表征信息
Fig. 6. Characterizations of Cu/SBA-15, Cu@Si/SBA-15, and Cs-Cu@Si/SBA-15. (a,b) Low-temperature (77 K) infrared transmission spectra. (c) FT k3-weighted Cu K-edge EXAFS spectra. (d–f) Wavelet transform for k3-weighted Cu K-edge EXAFS signals. Note: For all wavelet representations, the following set of parameters controls the WT resolution: σ = 1 and η = 7. Note that not all WT EXAFS are phase-corrected, which results in about 0.4 Å with respect to the actual radial distances.