تثبيت نانوذرات پالاديم در حفره‌هاي اورگانوسيليكاي منظم اتان-‌بنزن و بررسي ويژگي كاتاليستي آن در جفت‌شدن سوزوكي-ميائورا

Immobilization of Pd Nanoparticles in Ethane-Benzene Periodic Mesoporous Organosilica and Investigation of their Catalytic Activity in Suzuki-Miyaura Coupling

در اﯾﻦ ﭘﮋوھﺶ، ﻧﺎﻧﻮذرات ﭘﺎﻻدﯾﻢ در ﻧﺎﻧﻮﺳﺎﺧﺘﺎر اورﮔﺎﻧﻮﺳﯿﻠﯿﮑﺎيﻣﻨﻈﻢ اﺗﺎن-ﺑﻨﺰن ﺳﻨﺘﺰ و ﻓﻌﺎﻟﯿﺖ ﮐﺎﺗﺎﻟﯿﺴﺘﯽ آن در واﮐﻨﺶ ﺳﻮزوﮐﯽ-ﻣﯿﺎورا ﺑﺮرﺳﯽ ﺷﺪ. ﻧﺎﻧﻮﮐﺎﺗﺎﻟﯿﺴﺖ ﺳﻨﺘﺰﺷﺪه ﺑﺎ روشھﺎي ﻣﺘﻌﺪدي ﻧﻈﯿﺮ ﺟﺬب –واﺟﺬب ﻧﯿﺘﺮوژن، ﻣﯿﮑﺮوﺳﮑﻮپ اﻟﮑﺘﺮوﻧﯽ روﺑﺸﯽ ﮔﺴﯿﻞﻣﯿﺪاﻧﯽ، طﯿﻒﺳﻨﺠﯽ ﭘﺮاش اﻧﺮژي ﭘﺮﺗﻮ اﯾﮑﺲ و آﻧﺎﻟﯿﺰ ﭘﻼﺳﻤﺎي ﺟﻔﺖﺷﺪه اﻟﻘﺎﯾﯽ ﻣﺸﺨﺼﮫﯾﺎﺑﯽ ﺷﺪ. ﺳﭙﺲ، ﻓﻌﺎﻟﯿﺖ ﻧﺎﻧﻮﮐﺎﺗﺎﻟﯿﺴﺖ ﺑﮫدﺳﺖ آﻣﺪه در ﻓﺮآﯾﻨﺪ ﺟﻔﺖﺷﺪن ﺳﻮزوﮐﯽ-ﻣﯿﺎورا ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﯾﺎﻓﺘﮫھﺎ ﺑﯿﺎﻧﮕﺮ آن اﺳﺖ ﮐﮫ اﯾﻦ ﻧﺎﻧﻮﮐﺎﺗﺎﻟﯿﺴﺖ از ﻓﻌﺎﻟﯿﺖ ﺑﺎﻻﯾﯽ در ﺗﻮﻟﯿﺪ ﻣﺤﺼﻮل ﺑﺎيآرﯾﻞ ﺑﺮﺧﻮردار اﺳﺖ. ھﻤﭽﻨﯿﻦ آزﻣﺎﯾﺶ ﺑﺎزﯾﺎﺑﯽ ﻧﺸﺎن داد ﮐﮫ اﯾﻦ ﻧﺎﻧﻮﮐﺎﺗﺎﻟﯿﺴﺖ ﺑﺪون ﮐﺎھﺶ ﭼﺸﻤﮕﯿﺮ در ﻓﻌﺎﻟﯿﺖ ﺗﺎ 7 ﻣﺮﺗﺒﮫ ﻗﺎﺑﻞ ﺑﺎزﯾﺎﺑﯽ است

In this research, Pd nanoparticles were synthesized in ethane-benzene periodic mesoporous organosilica and their catalytic activity was investigated in the Suzuki-Miyaura reaction. The synthesized nanocatalyst was studied by several analyzes such as nitrogen adsorption-desorption analysis, field emission scanning electron microscopy (FE-SEM), Energy-dispersive X-ray spectroscopy (EDX) and inductively coupled plasma analysis (ICP). Then the activity of the obtained nanocatalyst was investigated in the Suzuki-Miura coupling process. The final optimum conditions for the Suzuki coupling reaction are: aryl boronic acid (1.1 mmol), aryl halide (1 mmol), potassium carbonate (3 mmol), nanocatalyst (0.2 mole%), ethanol as solvent and temperature 65 ˚C. The results indicate that this nanocatalyst has high activity in the production of biaryl product. In addition, the recycling experiment showed that no considerable change in the activity of the catalyst for at least 6 consecutive runs, which clearly demonstrates the stability of the catalyst for these conditions in the Suzuki-Miyaura reaction.