Nar kabuğu destekli NH2/PdMnAg katalizörü varlığında sodyum bor hidrürün metanolizinin araştırılması

Öz

Bu çalışmada, organik atık kaynaklarından olan nar kabuğu, katalizör üretimi için ilk kez doğrudan destek malzemesi olarak kullanılmıştır. Amaç, yenilenebilir bir enerji kaynağı olan hidrojen üretimi için kullanılabilecek metal içeren katalizörlerde kullanılacak olan destek maddesini doğrudan kullanarak yüksek etkinliğe sahip bir katalizör sentezlemektir. Çalışma kapsamında toz haline getirilmiş nar kabuğu üzerine etanol eklenerek, daha sonra üzerine sırasıyla belirli oranlarda (0.3 Pd (mg metal/g katalizör)), (0.15 Mn ( mg metal/g katalizör)), (0.075 Ag ( mg metal/g katalizör)) ve 3-aminopropiltrimetoksisilan ilave edilerek katalizör sentezlenmiştir. Son olarak, elde edilen katalizör sodyum bor hidrürün metanoliz reaksiyonunda hidrojen üretiminde kullanılmak üzere performansı test edilmiştir. Yapılan deneylerde Nar Kabuğu-NH2/PdMnAg (PP-NH2/PdMnAg) katalizörünün farklı NaBH4 miktarı (%1, %2.5, %5, ve %7.5), farklı katalizör miktarları (0.05, 0.1, 0.15, ve 0.25 g) ve farklı sıcaklıklarda (30, 40, 50, 60 oC) denenerek performans deneyleri tamamlanmıştır. Ayrıca üretilen katalizörün karakterizasyonu için FTIR ve ICP-OES analizleri yapılmıştır. Sonuç olarak PP-NH2/PdMnAg katalizörü tarafından katalize edilen % 2.5 NaBH4 metanoliz reaksiyonunda 30 ve 60 °C için reaksiyon hızları sırasıyla 7209.4 ve 11334 mLdak-1g.kat-1 olarak bulunmuştur. PP-NH2/PdMnAg katalizörünün aktivasyon enerjisi ise 22,56 kJ mol-1 olarak hesaplanmıştır. Yeniden kullanılabilirlik deneyleri de aynı koşullar altında beş kez tekrarlanmış ve her kullanımda neredeyse % 100 dönüşüm elde edilmiştir.

Anahtar Kelimeler

• Metanoliz
• hidrojen
• NaBH4
• PPNH2/PdMnAg
• kataliz
• nar kabuğu

Investigation of sodium borohydride methanolysis in the presence of pomagranate peel supported NH2/PdMnAg catalyst

Öz

In this study, pomegranate peel, one of the organic waste sources, was used for the first time as a direct support material for catalyst production. The aim is to synthesize a high efficiency catalyst using directly the support material to be used in metal containing catalysts that can be used for the production of hydrogen. Within the scope of the study, the catalyst was synthesized by adding ethanol on the powdered pomegranate peel and adding certain proportions (0.3 Pd (mg metal/g catalyst)), (0.15 Mn ( mg metal/g catalyst)), (0.075 Ag ( mg metal/g catalystr)) and 3-aminopropyltrimethoxysilane respectively. Finally, the performance of the obtained catalyst sodium boron hydride for the production of hydrogen by the methanolis reaction was tested. The effect of the amount of NaBH4 was investigated with 1%, 2.5%, 5%, and 7.5% ratio of NaBH4 while the influence of the concentration of catalyst was carried-out at 0.05, 0.1, 0.15, and 0.25 g catalysts. Four different temperatures were tested (20, 30, 40, 50 and 60 °C) to examined the performance of the catalyst under different temperatures. In addition, FTIR and ICP-OES analyzes were carried out for characterization of the produced catalyst. As a result, the reaction rates for 30 and 60 ° C in the 2.5% NaBH4 methanolisation catalyzed by the PP-NH2 / PdMnAg catalyst were found to be 7209.4 and 11334 mLmin-1g.cat-1, respectively. The activation energy of PP-NH2/PdMnAg catalyst was calculated as 22.56 kJ mol-1. Also, reusability experiments were repeated five times under the same conditions and almost 100% conversion was achieved with each use.

Anahtar Kelimeler

• Methanolysis
• hydrogen
• NaBH4
• PPNH2/PdMnAg
• catalysis
• pomagrante peel

Kaynakça

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