fig5
![Highly selective production of renewable methyl acrylate via aldol condensation over Cu modified nitrogen-containing Beta zeolites](https://image.oaes.cc/74271cd3-592b-4ed0-9e90-fbb1791c4e36/cs4004.fig.5.jpg)
Figure 5. (A) 29Si MAS NMR and (B) FT-IR spectra of HBeta and NBeta zeolites with different Cu loadings. 29Si MAS NMR: Silicon-29 magic angle spinning nuclear magnetic resonance; FT-IR: Fourier transform infrared spectroscopy; HBeta: H-form Beta; NBeta: nitrogen-containing Beta.