کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6588928 456830 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct synthesis of hierarchical USY zeolite for retardation of catalyst deactivation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Direct synthesis of hierarchical USY zeolite for retardation of catalyst deactivation
چکیده انگلیسی
Hierarchically structured zeolite Y was hydrothermally synthesized using a water glass containing organosilane surfactant as a mesoscale template. The resulting hierarchical zeolite Y was characterized by a complementary combination of X-ray powder diffraction, Fourier transform infrared spectroscopy, N2 adsorption-desorption isotherms, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, 27Al MAS NMR spectroscopy and density functional theory (DFT) calculation. These results indicated that the hierarchical zeolite Y contained disordered intracrystal mesopores. In addition, quantum chemical calculation results showed that organosilane surfactants could be easily dispersed into the viscous gel used in the synthesis of zeolite Y, inhibiting the phase-separation phenomenon. Hierarchical zeolite Y exhibited remarkably higher resistance to deactivation in the aldol condensation reaction of benzaldehyde with n-butyl alcohol than that of commercial zeolite Y, which is attributed to the highly mesoporous structure that can improve access of reactant molecules to the active sites and minimize the diffusion length of coke precursors out of the zeolite matrix. Such hierarchically porous zeolite Y is very attractive for applications in adsorption and catalysis involving bulky molecules.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 153, 22 October 2016, Pages 374-381
نویسندگان
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