fig6

Figure 6. Pyridine-adsorbed DRIFTS spectra of (A) Pt-WOx, (B) Pt-MOF-74(Co) and (C) Pt-WOx-MOF-74(Co); (D) NH3-TPD-MS curve of Pt-MOF-74(Co) and Pt-WOx-MOF-74(Co). DRIFTS: Diffuse reflectance infrared Fourier transform spectroscopy; MOF: metal-organic framework; NH3-TPD: NH3 temperature-programmed desorption.