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

Duygu Elma Karakaş

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

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Referanslar


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