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سنتز و شناسایی پلی اکسومتالات استخلاف شده با فلزات واسطه قرار گرفته در درون بافت سیلیکای آمورف و بررسی رفتار کاتالیستی این ترکیبات در اکسایش انتخابی آمین های مختلف با استفاده از پراکسید هیدروژن | ||
| شیمى کاربردى روز | ||
| دوره 20، شماره 74، فروردین 1404، صفحه 195-216 اصل مقاله (1.16 M) | ||
| نوع مقاله: مقاله علمی پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/chem.2025.36836.2342 | ||
| نویسندگان | ||
| مصطفی ریاحی فارسانی* 1؛ بهرام یدالهی2؛ ستاره ابوالقاسمی دهنوی1 | ||
| 1گروه شیمی، دانشکده علوم پایه، دانشگاه شهرکرد، شهرکرد، ایران | ||
| 2دانشکده ی شیمی، دانشگاه اصفهان، اصفهان، ایران | ||
| تاریخ دریافت: 07 اسفند 1403، تاریخ بازنگری: 24 اردیبهشت 1404، تاریخ پذیرش: 10 خرداد 1404 | ||
| چکیده | ||
| در این مطالعه اکسایش انتخابی آمین ها با استفاده از پروکسیدهیدروژن به عنوان یک اکسیدان سبز با استفاده از کاتالیست پلی اکسومتالات کگین استخلاف شده با فلزات واسطه ی سری اول قرار گرفته در بافت سیلیکا انجام گرفته است. در ابتدا پلی‌اکسومتالات‌های نوع کگین استخلاف شده با برخی از فلزات واسطه ی سری اول واسطه (M= Cr, Mn, Fe, Co, Ni, Cu, Zn) (TBA)X[PW11MO39].nH2O سنتز و با استفاده از روش سول-ژل در درون بافت سیلیکا قرار گرفت. ترکیبات سنتز شده با استفاده از تکنیک های EDAX، CHNS،XRD ، SEM و TG-DTG شناسایی شد. به منظور انتخاب بهترین کاتالیست، اکسایش آنیلین با استفاده از تمامی کاتالیست ها مورد بررسی قرار گرفت که کاتالیست حاوی آهن بهترین عملکرد را از خود نشان داد. پس از تعیین شرایط بهینه برای این کاتالیست اکسایش آمین های گوناگون با استفاده از کاتالیست استخلاف شده با آهن انجام شد که نتایج حاصل عملکرد بسیاز مطلوب این کاتالیست را در اکسایش انتخابی آمین های آروماتیک را به نیترو مربوطه در یک سیستم کاتالیستی ناهمگن را نشان داد. همچنین بررسی بازیابی کاتالیست نشان داد که این کاتالیست عملکرد بسیار مناسبی در بازیابی و تکرارپذیری بدون کاهش قدرت کاتالیستی از خود نشان می دهد. | ||
| کلیدواژه‌ها | ||
| اکسایش آمین ها؛ پلی اکسومتالات ها؛ پراکسید هیدروژن؛ سیلیکای آمورف | ||
| عنوان مقاله [English] | ||
| Synthesis and characterization of mono substituted polyoxometalate incorporation into amorph silica and catalytic activity of these compounds in selective oxidation of aromatic amines with hydrogen peroxide | ||
| نویسندگان [English] | ||
| Mostafa Riahi Farsani1؛ Bahram Yadollahi2؛ Setareh Abolghasemi Dehnavi1 | ||
| 1Departement of Chemistry, Faculty of Science, Shahrekord University, Shahrekord, Iran | ||
| 2Department of Chemistry, University of Isfahan. Isfahan 81746-73441, Iran | ||
| چکیده [English] | ||
| In this study, the selective oxidation of aromatic amines using hydrogen peroxide as an green oxidant and a polyoxometalate catalyst modified with first-row transition metals in a silica matrix was performed. Initially Mono substituted Keggin type Polyoxometalates with first row transition metals (TBA)X[PW11MO39].nH2O (M= Cr, Mn, Fe, Co, Ni, Cu, Zn) were synthesised and then incorporated into a silica matrix by using sol-gel method. The synthesized compounds were characterized using techniques such as EDAX, CHNS, XRD, SEM, and TG-DTG. For selecting the best catalyst, oxidation of aniline was performed with all catalysts and polyoxometalate substituted with Fe showed best catalytic activity. After optimization reaction conditions, oxidation of different aromatic amine was performed and Fe substituted polyoxometalates showed excellent catalytic activity for selective oxidation of different amines to corresponded nitro in heterogeneous system. The studies indicated that the catalysts have good recovery capabilities and can be reused multiple times without significant loss in activity. | ||
| کلیدواژه‌ها [English] | ||
| oxidation of amines, polyoxometalates, hydrogen peroxide, amorph silica | ||
| مراجع | ||
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