fig9

Figure 9. (A) Schematic drawing of the synthetic strategy of crystalline SDD BPO₄ scaffold; (B-M) Characterizations of crystalline SDD BPO₄ scaffold. (B) SAXS pattern. (C) Wide-angle XRD pattern. (D) Low-magnification SEM image. (E) High-magnification SEM image as shown in the white box in (D). (F and G) EDS mapping. (H and I) STEM images and the corresponding Fourier diffractograms of SDD BPO₄ scaffold taken from the [001] and [010] directions, respectively. (J) High-resolution TEM (HRTEM) image of SDD BPO₄ scaffold corresponding to the (101) plane of BPO₄. The inset shows the selected area electron diffraction with the polycrystalline ring pattern. (K) FTIR spectrum. (L) Temperature-programmed desorption of ammonia profile. (M) Pyridine-adsorption FTIR spectrum; (N) Catalytic acetalization of furfural and methanol to 2-(dimethoxymethyl)furan; (O) Effect of reaction time on the acetalization; (P) Reusability tests of SDD BPO₄ for the acetalization. This figure is reproduced with permission^[218]. Copyright 2024, Science China Press. THF: Tetrahydrofuran; PEO-b-PS: poly(ethylene oxide)-b-polystyrene; PEO: poly(ethylene oxide); SDD: shifted double diamond; SAXS: small-angle X-ray scattering; XRD: X-ray diffraction; SEM: scanning electron microscopy; STEM: scanning transmission electron microscopy; FTIR: Fourier transform infrared; EDS: energy dispersive X-ray spectroscopy.