کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
148484 456416 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intensive mechanical pre-treatment of hydrogel in zeolite synthesis: X zeolite synthesis system case study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Intensive mechanical pre-treatment of hydrogel in zeolite synthesis: X zeolite synthesis system case study
چکیده انگلیسی

Short period intensive mechanical treatment of initial hydrogel using fast planetary mills may induce significant changes on the particle size distribution, morphology and even phase structure of the resulting zeolite powder after the synthesis reaction. For a standard synthesis system that produces zeolite X, the effect of mechanical treatment is investigated based on XRD analysis, nitrogen adsorption isotherm measurement, light scattering and FESEM analysis of the resulting zeolite powder. ATR–FTIR has been used to characterize the freshly pre-treated hydrogels. It is shown that mechanical treatment of the gel induces the production of X/A zeolite crystal mixtures. Hydrogels leading to X zeolite show a strong peak at 3310 cm−1, while for hydrogels leading to zeolite A this peak, if present, is very weak. Accordingly, a novel and easy method has been proposed that allows the production of X/A zeolite powder mixtures with the desired proportion of X zeolite from 0% to 100% just by imparting a short time period intensive mechanical mixing of known intensity to the initial hydrogel. It is shown that if the mechanically treated hydrogel is subjected to further aging, pure X zeolite is obtained.

Figure optionsDownload as PowerPoint slideHighlights
► Effect of hydrogel intense mechanical treatment studied in X zeolite synthesis systems.
► Mechanical treatment without aging may be applied to produce A/X mixtures.
► Mechanical treatment with consequent aging results only in X zeolite.
► Hydrogels leading to X zeolite show a strong peak at 3310 cm−1 (ATR spectroscopy).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 221, 1 April 2013, Pages 247–253
نویسندگان
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