Fig nbsp a demonstrated the N adsorption ndash desorption isotherms

Fig. 1 showed the FTIR spectra of ZSM-5 (50) and ZRP-5 (50) samples. The characteristic bands of the silicon–oxygen tetrahedron such as the asymmetric stretching of external vibration bands, asymmetric stretching of internal vibration bands, symmetric stretching, double ring vibration and bending were present in all samples, corresponding to the characteristic peak at 1224, 1098, 799, 545 and 450 cm−1, respectively [24]. Therefore, the ZRP-5 zeolite was assigned to the MFI structure. Meanwhile, the peak observed at 877 cm−1 was due to the P–O–H stretching, verifying that BMS 182874 the phosphorus was introduced into the zeolite frameworks [25]. Moreover, the absorption peak near 3610 cm−1 in the spectrum of ZRP-5 (50) was stronger than that of ZSM-5 (50), which suggested that the amount of terminal hydroxyl groups of ZRP-5 (50) was more than ZSM-5 (50) [18], making the ZRP-5 (50) more hydrophilic than ZSM-5 (50), as verified by the contact angle measurement (see below). Fig. 2 illustrated the XRD patterns of Beta (50), ZRP-5 (50) and ZSM-5 (50) samples. As illustrated in Fig. 2, the diffraction peaks in the range of 2θ = 6.0–9.0° and 23.0–25.0° indicated that the framework of ZRP-5 corresponded well with the MFI structure [26]. The Beta (50) sample showed the typical XRD patterns of the BEA framework structure.