Gold Nanoparticle Immobilized Porous Manganese Oxide Microspheres As Heterogeneous Catalyst for Benzyl Alcohol Oxidation

Year 2022, Volume: 50 Issue: 1, 85 - 92, 05.01.2022

Kadriye Özlem Hamaloglu

https://doi.org/10.15671/hjbc.962119

Abstract

A heterogenous catalyst in the form of Au nanoparticles (Au NPs) immobilized porous manganese oxide (Mn5O8) microspheres was synthesized. The sol-gel templating method was used for the synthesis of Mn5O8 microspheres. The heterogenous catalyst showed good performance when compared with similar catalysts in the oxidation of benzyl alcohol. The heterogenous catalyst (Au@Mn5O8) obtained by the immobilization of Au NPs on Mn5O8 microspheres performed 99.4% of benzyl alcohol conversion and 100 % of benzaldehyde formation yield. Also the heterogenous catalyst showed a good stability and agglomeration resistance in the reusabilty experiments. Au@Mn5O8 microspheres could be reused up to 5 times without remarkable loss in the catalytic activity.

Keywords

Manganese oxide, Benzyl alcohol oxidation, Gold nanoparticles, Heterogenous catalysis

Thanks

The author thanks Prof. Dr. Ali TUNCEL for his valuable help to use his laboratory facilities and Rukiye Babacan Tosun for her valuable help during experiments.

Benzil alkol oksidasyonu için heterojen katalizör olarak altın nanoparçacık immobilize edilmiş gözenekli manganez oksit mikroküreler

Abstract

Altın nanopartiküllerle (Au NP'ler) dekore edilmiş gözenekli manganez oksit (Mn5O8) mikroküreleri formunda heterojen bir katalizör sentezlenmiştir. Mn5O8 mikrokürelerinin sentezi için sol-jel kalıplama yöntemi kullanılmıştır. Sentezlenen heterojen katalizör, benzil alkol oksidasyonunda benzer katalizörlerle karşılaştırıldığında iyi performans göstermiştir. Au NP'lerin Mn5O8 mikroküreleri üzerinde immobilizasyonu ile elde edilen heterojen katalizör (Au@Mn5O8) ile %99.4 benzil alkol dönüşümü ve %100 benzaldehit oluşum verimi elde edilmiştir. Ayrıca heterojen katalizör, tekar kullanılabilirlik deneylerinde iyi bir stabilite ve aglomerasyona karşı direnç göstermiştir. Au@Mn5O8 mikroküreleri, katalitik aktivitede kayda değer bir kayıp olmaksızın 5 kata kadar yeniden kullanılabilmiştir.

Keywords

Manganez oksit, Benzil alkol oksidasyonu, Altın nanopartiküller, Heterojen kataliz

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