کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
612276 880694 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and characterization of SBA-3, SBA-15, and SBA-1 nanostructured catalytic materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Synthesis and characterization of SBA-3, SBA-15, and SBA-1 nanostructured catalytic materials
چکیده انگلیسی

A highly ordered large pore mesoporous silica molecular sieve SBA-3, SBA-15, Al-SBA-15, and SBA-1, were developed and characterized by XRD, BET, FTIR, SEM, and NMR-MAS. The catalytic materials were synthesized using different raw materials and operation conditions. These materials contain a regular arrangement of uniform channels with diameters between 1.8 and 10 nm, high specific surface area and high specific pore volume. The designed methods were effective for the synthesis, presenting each mesostructured materials, patterns of XRD and other characteristics corresponding to the reported ones in literature. The new route employed to synthesize Al-SBA-15, generates a catalyst with only aluminum in tetrahedral form, according to the data of 27Al NMR-MAS. However, several reports indicated that the coordination of the Al atoms changes below the Si/Al ratio of 45, presenting peaks corresponding to penta and hexa-coordinated aluminum, which are absent in our samples (Si/Al = 50 and 33).

SBA-1, SBA-3, SBA-15, and Al-SBA-15 were successfully developed by a new route. Al-SBA-15 (Si/Al, a: 50 and b: 33) posses only AlTh. The main XRD signal appears at d100d100, 1.2° (2θ) shifts to 0.9°, for higher Al content.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 315, Issue 1, 1 November 2007, Pages 184–190
نویسندگان
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