نتایج جستجو برای: mcm 41 supported catalyst
تعداد نتایج: 324330 فیلتر نتایج به سال:
The transformation of acetone (a byproduct phenol manufacturing or a bioderived chemical) into mesitylene is very attractive reaction to prepare renewable fuels and chemicals. This has been studied over both base acid catalysts, with relevant limitations (side reactions oligomerization isophorones basic materials, etc.). We propose an alternative strategy perform this combining catalysts either...
هدف این رساله بدست آوردن سیلیس خالص از گیاه جگن و همچنین سنتز ماده میان حفره mcm-41 با استفاده از سیلیس استخراج شده بوده است. میان حفره تولید شده پس از عامل دار شدن با گروه های عاملی aptms و tren جهت جذب یون های cd(ii) و cr(vi) از محلول های آبی در سیستم های ناپیوسته و پیوسته بکار رفت. در فرآیند تولید سیلیس با بهینه کردن دمای احتراق و استفاده از شستشو و رفلاکس اسیدی ناخالصی های فلزی حذف شدند و س...
Benzene was hydroxylated with hydrogen peroxide (H2O2) in the presence of catalytic amounts of copper complexes in acetone to yield phenol at 298 K. At higher temperature, phenol was further hydroxylated with H2O2 by catalysis of copper complexes to yield p-benzoquinone. The kinetic study revealed that the rate was proportional to concentrations of benzene and H2O2, but to the square root of co...
Pyridine-functionalized MCM-41 catalyzed reactions between tetracyanoethylene and various activated CH-acid compounds are described. These reactions afford the corresponding pyran annulated heterocyclic ring systems in high yields at room temperature within a few minutes. The work-up procedure is very simple and the products do not require further purification. The catalyst can be recycled and ...
Introduction Carbonylation of aryl olefins and alcohols is one of the promising and environmentally benign routes [1] to aryl-propionic acids (e.g. Ibuprofen, Naproxen), important as non-steroidal anti-inflammatory agents. This reaction is considered as the best example of application of catalysis to develop “greener” routes for pharmaceuticals, replacing stoichiometric synthetic routes, as est...
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