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2. Results and Discussion 2.1. Synthesis and Characterization of CS-TS-1@mSiO2 The micro-sized TS-1 single crystal was prepared by hydrothermal method. The SEM image (Figure 1a) and TEM image (Figure 2a,b) indicate that the TS-1 sample consist of uniform monodisperse bromide) and TEOS (tetraethylorthosilicate) as solvent, basic catalyst, surfactant nanocrystals with a particle size of 290–350 nm. Core-shell structured TS-1@mesosilica composites and precursor, respectively [29,30]. The SEM micrograph (Figure 1b) shows that the (designated as CS-TS-1@mSiO2−x, x is the thickness of mSiO2 layer) were obtained through a uniform particles are oval in shape with a large diameter (350–400 nm), suggesting that an coating process using water-ethanol (2:1), ammonia aqueous, CTAB (hexadecyltrimethylammonium mSiO2 layer of approximately 30 nm was formed on the surface of the TS-1 crystals. bromide) and TEOS (tetraethylorthosilicate) as solvent, basic catalyst, surfactant and precursor, From the TEM image in Figure 2d, it can be clearly seen that every TS-1 crystal respectively [29,30]. The SEM micrograph (Figure 1b) shows that the particles are oval in shape with a is encapsulated with a 30 nm mSiO2 layer. Furthermore, the HRTEM images in large diameter (350–400 nm), suggesting that an mSiO2 layer of approximately 30 nm was formed on Figure 2e,f reveal that the mesopores are nearly perpendicular to the microporous the surface of the TS-1 crystals. From the TEM image in Figure 2d, it can be clearly seen that every frameworks (directed by red arrows) and there are close connections between the TS-1 crystal is encapsulated with a 30 nm mSiO2 layer. Furthermore, the HRTEM images in Figure 2e,f mesoporous silica shells and the zeolite cores, facilitating efficient transportation of reveal that the mesopores are nearly perpendicular to the microporous frameworks (directed by red reactants into active microporous framework through the mesochannels. It is worth arrows) and there are close connections between the mesoporous silica shells and the zeolite cores, mentioning that the current coating process did not involve any surface modifiers facilitating efficient transportation of reactants into active microporous framework through the or additions that were often necessary for obtaining uniform core-shell structured mesochannels. It is worth mentioning that the current coating process did not involve any surface zeolite@mSiO compositeswithorientedmesochannelsinmSiO shell[22,23],which 22 modifiers or additions that were often necessary for obtaining uniform core-shell structured can be attributed to the flexibility in current synthesis system [29,30]. In addition, the zeolite@mSiO2 composites with oriented mesochannels in mSiO2 shell [22,23], which can be attributed thickness of mesoporous silica shells could be tailored by adjusting the amount of to the flexibility in current synthesis system [29,30]. In addition, the thickness of mesoporous silica TEOS precursor. For example, when the amount of TEOS was increased to 0.20 mL, shells could be tailored by adjusting the amount of TEOS precursor. For example, when the amount of we obtained CS-TS-1@mSiO with a uniform mSiO shell of 50 nm (Figure 2g–i). 22 TEOS was increased to 0.20 mL, we obtained CS-TS-1@mSiO2 with a uniform mSiO2 shell of 50 nm ThiscontrolonthicknessofthemSiO shellissignificantinregulatingthecatalytic 2 (Figure 2g–i). This control on thickness of the mSiO2 shell is significant in regulating the catalytic properties of materials. properties of materials. FigFuirgeure1.1.(a)(a)SSEM iimages ooffpripsrtiisntieneTS-T1S;-1(b;) (CbS)-TSC-S1-@TmS-S1i@Om-3S0iOa2n-3d0(c)and 2 (c) CS-TS--1@mmSSiOiO-25-500. . 2 The nanoporous structure of CS-TS-1@mSiO2 composites was further characterized by XRD and nitrogen sorption analysis. Apparently, the small-angle XRD pattern of CS-TS-1@mSiO2-30 (Figure 3A) shows a broad diffraction peak at a 2θ value of approximately 2.4◦ whereas pristine TS-1 shows no diffraction peaks. This suggests an unordered mesostructure in mSiO2 shell. Moreover, a broad diffraction peak with higher intensity and a weak diffraction peak are simultaneously present at 2θ values of 2.4◦ and 4.8◦ in the small-angle XRD pattern of CS-TS-1@mSiO2-50 (Figure 3A), revealing that the mesochannels in mSiO2 shell are partly ordered. These results indicate that the order degree of the mesochannels increased with increase in the thickness of them SiO2 shell, which is in accordance 142PDF Image | Zeolite Catalysis
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