3DOM CeO2 ve 3DOM ZrO2 destekli Nikel katalizörlerin sentezi, karakterizasyonu ve katalitik aktivite çalışmaları

Year 2018, Volume: 33 Issue: 4, 1273 - 1284, 19.12.2018

Filiz Derekaya İkbal Ay

https://doi.org/10.17341/gazimmfd.416424

Abstract

Bu çalışmada 3DOM ZrO₂ ve 3DOM CeO₂ destekli nikel içeren katalizörlerin sentezi, karakterizyonu ve amonyaktan hidrojen üretim reaksiyonu için aktivite çalışmaları gerçekleştirilmiştir. 3DOM destekler polistiren (PS)’ in şablon olarak kullanıldığı kolloidal kristal şablonlama metodu kullanılarak hazırlanmış ve daha sonra nikel destek yapısına gaz kabarcığı yardımı ile çökelti (tortu) birikimi yöntemi ile katılmıştır. Tüm malzemeler N₂ fizisorpsiyon, taramalı elektron mikroskobu (SEM-EDX) ve X-ışını kırınım deseni analizi çalışmaları ile karakterize edilmişlerdir. SEM sonuçları CeO₂ ve ZrO₂ desteklerinin üç boyutlu düzenli makrogözenekli yapıda sentezlendiğini ve gözenek çaplarının 204-321 nm arasında değiştiğini göstermiştir. SEM sonuçları aynı zamanda NiO’ in 3DOM gözenek yapısı içine başarılı bir şekilde girdiğini de göstermiştir. Destek ve katalizörlerin yapısında makrogözeneklerin yanında mezogözeneklerinde olduğu belirlenmiştir. Amonyaktan hidrojen üretim reaksiyonu 400-600^oC sıcaklıkları arasında gerçekleştirilmiştir. 500^oC’ ye kadar katalizörler ihmal edilebilir katalitik aktivite göstermişlerdir. Reaksiyon sıcaklığının yükselmesi ile aktivitelerde de yükselmiştir. 600^oC sıcaklıkta NiO/3DOM ZrO₂ and NiO/3DOM CeO₂ katalizörlerinden sırasıyla % 5.6 ve % 18.6 NH₃ dönüşümü elde edilmiştir. 

Keywords

3DOM 1, Katalizörler 2; Amonyak 3; Hidrojen 4

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