The comparative study of support effect in silver- graphene oxide nano magnetic catalyst
محل انتشار: بیستمین کنگره شیمی ایران
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 278
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شناسه ملی سند علمی:
IRANCC20_512
تاریخ نمایه سازی: 28 اردیبهشت 1398
چکیده مقاله:
Silver nanoparticles are one of the most interesting material in catalyst synthesis.The large specific surface area causes high catalytic activity, in other hand this property lead to agglomeriation. In addition, nanocatalysts suffer from agglomeration, recovery, temperature instability and sepration. These problems would be solved just by selecting appropriate material as catalyst support1. Surface chemistry play a key role in selecting materials as catalyst support and checking catalytic efficiency. among carbon-based materials, graphene oxide (GO) with high specific surface area has the most application in catalysis studies. functional groups such as carbonyl, hydroxyl and epoxy on the GO surface improve selectivity in reactions. According to synergitic effect, combination of different nanomaterials such as metal or metal oxide and GO, enhance their properties . In addition, metal nanoparticles distribute uniformly and functional groups act as nucleation sites by using GO as a support2. The amorphous structure and thermally stable mesoporous silica (mSiO2) leads researchers to use it in preparation of different catalysts. This structure of silica provide suitable space for metal NPs with specific size, so aggregation or agglomeration could be avoided1,3. In the present study different nanocomposites of silver and graphene oxide, GOFe3O4@ SiO2-Ag and GO-Fe3O4-Ag, were synthesized in order to compare their properties. Both catalysts were characterized by different method and their catalytic activity were examined by aerobic oxidation of benzyl alcohol. Using silica in catalyst support increase the yield reaction.
نویسندگان
Shiva Ataei Kachouei
Department of Chemistry, Sharif University of Technology, Tehran, Iran.
Ahmad Bayat,
Department of Chemistry, Sharif University of Technology, Tehran, Iran.
Mohammad Mahmoodi Hashemi
Department of Chemistry, Sharif University of Technology, Tehran, Iran.