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Table 1. .Textural properties of pristine TS-1, core-shell structured TS-1@mesosilica composite (CS-TS-1@mSiO2) and yolk-shell structured TS-1@mesosilica composite (YS-TS-1@mSiO2) a. Sample [m2 g−1] [m2 g−1] [m2 g−1] [m3 g−1] [m3 g−1] [nm] [nm] SBET Smicro Sext Vmicro Vext Dmicro Dmeso composite (CS-TS-1@mSiO2) and yolk-shell structured TS-1@mesosilica composite Table 1. Textural properties of pristine TS-1, core-shell structured TS-1@mesosilica (YS-TS-1@mSiO2) a. pristine TS-1 CS-TS-1@mSiO2-30 CS-TS-1@mSiO2-50 pristine TS-1 YS-TS-1@CSm-TS-1i@Om2SiO2-30 695654.62 CS-TS-1@mSiO2 -50 635.9 a SBET: specific BET su2rface area; Smicro: micropore area; Sext: external surface area; Vmicro: micropore volume; Sample 368.5 56S4BE.T6 [m2 g−1] 635.9 249.3 S7m1icr.o8 [m2 g−1] 53.2 119.2 0.12 S4ex9t 2.8 Vmic0ro.031 [m2 g−1] [m3 g−1] 582.7 0.027 0.26 Vext 0.412Dmicro 0.55 - 0.D5m5eso 2.6 0.454 49623.88.0 0.0301.028 0.4120.4840.55 0.55 2.6 [m3 g−1] [nm] [nm] 119.2 0.12 0.26 YS-TS-1@mSiO 695.2 57.2 638.0 0.028 0.484 0.55 2.8 368.5 0.55 - 0.525.6 2.8 249.3 7517.8.2 53.2 582.7 0.027 0.454 0.55 2.6 a S : specific BET surface area; S : micropore area; Sext: external surface area; BET micro Vext: mesopore volume; Dmicro: micropore diameter; Dmeso: mesopore diameter. Vmicro: micropore volume; Vext: mesopore volume; Dmicro: micropore diameter; Dmeso: mesopore diameter. The nature and coordination of Ti species in silica network was characterized by FT-IR and UV-V pectroscopy. The FT-IR spectrum of pristine TS-1 shows three different bands at 550 cm−1, 804 cm The nature and coordination of Ti species in silica network was characterized by FT-IR and UV-Vis spectroscopy. The FT-IR spectrum of pristine TS-1 shows three nd 960 cm−1 (Figure 4A). The band at 550 and 804 cm−1 are assigned to δ(Si-O-Si) and ν(Si-O-Si different bands at 550 cm−1, 804 cm−1 and 960 cm−1 (Figure 4A). The band at 550 and spectively. The pe−a1k at 960 cm−1 is often referred to as Ti-O-Si band and can be consi−d1ered as a go 804 cm are assigned to δ(Si-O-Si) and ν(Si-O-Si), respectively. The peak at 960 cm dication of itsitoanftieunmresfeurbrsetdittuotiaosnTin-Oto-Stihbeaznedoalinted fcraanmbewconrks.idIenretdheasUaVg-ovoisd sinpdecictarutimon(oFfigure 4B), t aximum absorption peak appears around 210 nm, which further confirms the existence of the titanium substitution into the zeolite framework. In the UV-vis spectrum (Figure 4B), the maximum absorption peak appears around 210 nm, which further confirms the amework. Furthermore, the presence of a weak absorption at 330 nm suggests the presence of a lo existence of the Ti framework. Furthermore, the presence of a weak absorption at mount of anatase phase. Importantly, both the CS-TS-1@mSiO2 exhibit identical FT-IR and UV-V 330 nm suggests the presence of a low amount of anatase phase. Importantly, both pectra as thotshe oCfS-tThSe-1p@rimstSiinOe2TexSh-i1b,itriedveenatilcinalgFTth-IaRt athned UTVi -aVcitsivspeescptreacaisesthwosaesorfethtaeinperidstinethe TS-1 co TS-1, revealing that the Ti active species was retained in the TS-1 core during the uring the coating process. Additionally, the absence of the bands at 250–280 nm in these UV-V coating process. Additionally, the absence of the bands at 250–280 nm in these UV-Vis ectra reveals that amorphous Ti species is neither present in the TS-1 core nor in the mSiO2 she spectra reveals that amorphous Ti species is neither present in the TS-1 core nor in hese results indicate that the process of coating mSiO2 did not have any negative effect on the catalyt the mSiO2 shell. These results indicate that the process of coating mSiO2 did not ehavior of ThSa-v1e. any negative effect on the catalytic behavior of TS-1. Figure 4. (A) FT-IR spectra and (B) UV-Vis spectra of (a) pristine TS-1, Figure 4. (A) FT-IR spectra and (B) UV-Vis spectra of (a) pristine TS-1, (b) CS-TS-1@mSiO -30, (c) CS-TS-1@mSiO -50 and (d) YS-TS-1@mSiO . 222 (b) CS-TS-1@mSiO2-30, (c) CS-TS-1@mSiO2-50 and (d) YS-TS-1@mSiO2. .2. Synthesis and Characterization of YS-TS-1@mSiO2 The yolk-shell structured TS-1@mesosilica composite (YS-TS-1@mSiO2) was prepared using sorcinol-formaldehyde resin (RF) middle-layer as the sacrificial template. Following a publish 145 − eo nh mT rw r pl Ti ee eport [31], the TS-1 crystals were first coated with the RF layer via simple cooperative template-directePDF Image | Zeolite Catalysis
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