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with the TEM results and was likely caused due to the increase in the domain-size of the ordered mesostructure [25]. The wide-angle XRD patterns of both the composites (Figure 3B) exhibit the same characteristic diffraction peaks as those of the pristine TS-1, assigned to the typical MFI structure. The lower diffraction intensity is probably due to the shielding effects of the mesosilica shell. Catalysts 2015, 5 2137 Figure 2. Low- moderate- and high-magnification TEM images of (a–c) pristine TS-1; Figure 2. Low- moderate- and high-magnification TEM images of (a–c) pristine (d–f) CS-TS-1@mSiO2-30 and (g–i) CS-TS-1@mSiO2-50. TS-1; (d–f) CS-TS-1@mSiO2-30 and (g–i) CS-TS-1@mSiO2-50. The nanoporous structure of CS-TS-1@mSiO2 composites was further characterized by XRD and In the N2 sorption analysis, the pristine TS-1 shows a type-I isotherm according nitrogen sorption analysis. Apparently, the small-angle XRD pattern of CS-TS-1@mSiO2-30 (Figure 3A) to the IUPAC (International Union of Pure and Applied Chemistry) classification shows a broad diffraction peak at a 2θ value of approximately 2.4° whereas pristine TS-1 shows no withasharpuptakeintheP/P range0–0.01,acharacteristicbehaviorofcompletely 0 diffraction peaks. This suggests an unordered mesostructure in mSiO2 shell. Moreover, a broad microporous materials (Figure 3C). On the other hand, the CS-TS-1@mSiO diffraction peak with higher intensity and a weak diffraction peak are simultaneously present at 2θ valu2es composites with different shell thickness (30 nm or 50 nm) exhibit a similar of 2.4° and 4.8° in the small-angle XRD pattern of CS-TS-1@mSiO2-50 (Figure 3A), revealing that the muepsotachkaennaetlslionwmSPiO/2P0she(ltlyapre-pIarctulyrvoerdse)r;edh.oTwhesveerre,sualtns iandidcaiteiotnhatlthuepotradkeer dfeoglrleoewoifntghe mtyespoicchalnnteylpsein-cIrVeasceudrwviethsiwncirtehaseaincathpeiltlhaicrkynecsosnodfethnesmatSiioOn2sshtelpl,wahpicpheiasrisnactcomrdoadnceerawtieth thPe/PTEM(0.r2e–s0ul.t6s).anAddwiastilnikcetlyhycsatueseredsidsuelotopthoefiHnc2retaysepeinisthaelsdoomclaeina-rsliyzeoobfsethrveeodrdfeorerd 0 mesostructure [25]. The wide-angle XRD patterns of both the composites (Figure 3B) exhibit the same both the composites. These phenomena reveal the bimodal-pore properties of the characteristic diffraction peaks as those of the pristine TS-1, assigned to the typical MFI structure. The CS-TS-1@mSiO2 composites from micropores to mesopores as well as the accessible lower diffraction intensity is probably due to the shielding effects of the mesosilica shell. microporous ZSM-5 cores covered with a mesoporous silica shell. Moreover, in In the N2 sorption analysis, the pristine TS-1 shows a type-I isotherm according to the IUPAC (International Union of Pure and Applied Chemistry) classification with a sharp uptake in the P/P0 range 143 0–0.01, a characteristic behavior of completely microporous materials (Figure 3C). On the other hand, the CS-TS-1@mSiO2 composites with different shell thickness (30 nm or 50 nm) exhibit a similar uptake at low P/P0 (type-I curves); however, an additional uptake following typical type-IV curves with aPDF Image | Zeolite Catalysis
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