توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Nanocatalyst Based on Zirconocene Grafted with SBA–15 and MCM–41 for Olefin Polymerization
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Extensive research is currently underway to develop supported metallocene–based catalysts for their good activity and selectivity in olefin polymerization. Because of metallocene interactions with surface of zeolitic materials,supporting them is a unique route for preparation of heterogenous nanocatalysts.In this paper the main methods for preparation of nanoporous silica (SBA–15 and MCM–41) was investigated and purity and crystallinity of prepared supports were confirmed by XRD and SEM . Finally supported catalysts was prepared by grafting Cp2ZrCl2 on these supports to give materials potentially active in the polymerization of olefins.The morphology and surface properties of supported nanocatalysts have been studied by XRD,thermal analysis and BET surface area and pore volume measurements.The grafting of the metallocene complexes have been followed by FTIR spectroscopy.The catalytic activity of these heterogenous nanocatalysts is under investigation.<\div>

۲Lanthanide Modified SAPO–34 Nanocatalysts for Methanol to Propylene Conversion
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
The evaluation of small–pore molecular sieves as catalysts for the conversion of methanol to light olefins (MTO) has shown that SAPO–34 exhibits the best performance based on catalyst life, selectivity to C2–C4 olefins, minimum paraffinic and aromatic byproducts and catalyst stability and regenerability.SAPO–34 molecular sieves can be selectively formed with hydrothermal methods irrespective of the acidity or the types of the templates. In this work, Silicoaluminophosphate (SAPO)–34 molecular sieves modified with internal transition metals such as Praseodymium and Neodymium were investigated for their activity, selectivity, and lifetime in the methanol to olefins (MTO) reaction and compared with that of unmodified SAPO–34 These catalysts increase propylene selectivity in MTO reaction the structure of synthesized catalysts have been characterized with several methods such as FT–IR, TGA, SEM, BET and XRD.<\div>
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