H2S’ÜN SEÇİCİ KATALİTİK OKSİDASYONU İLE ELEMENTEL KÜKÜRT ELDESİNDE Ce-O KATALİZÖRLERİ

Yıl 2017, Cilt: 32 Sayı: 3, 0 - 0, 07.09.2017

Hacı Mehmet Taşdemir , Yavuz Yağızatlı Sena Yaşyerli , Nail Yaşyerli , Gülşen Doğu

https://doi.org/10.17341/gazimmfd.337632

Cited By: 1

Öz

Bu çalışmada, modifiye edilmiş kompleksleştirme yöntemi ile Ce-O katalizörleri hazırlanmış ve seçici katalitik oksidasyon ile elementel kükürt eldesindeki aktiviteleri araştırılmıştır. Katalizör sentezinin son basamağı olan kalsinasyon işlemi farklı sıcaklıklarda (300 ^oC, 350 ^oC, 400 ^oC ve 450 ^oC) gerçekleştirilerek kalsinasyon sıcaklığının katalitik aktiviteye etkisi incelenmiştir. Ce-O katalizörleriyle aktivite testleri 250^oC sıcaklık ve farklı O₂/H₂S oranlarında sabit-yatak reaktör sisteminde gerçekleştirilmiştir. Farklı sıcaklıklarda kalsine edilen bütün katalizörlerin XRD desenlerinde yığın fazın “cerianite” kristal yapısında ve stokiyometrik olmayan oranda O₂ bulundurduğu (CeO_2-x) gözlenmiştir. Ce-O katalizörlerinin XPS analizi bu sonucu desteklemiş, katalizör yüzeyinde seryumun çoğunlukla +4 ve beraberinde +3 değerlikte bulunduğunu göstermiştir. Bütün Ce-O katalizörleri ile oldukça yüksek elementel kükürt seçiciliği (≥%97) elde edilmiştir. Bununla beraber, H₂S seçici oksidasyonunda en uzun süre aktiviteyi (%69 H₂S dönüşümü) 350 ^oC’da kalsine edilen Ce-O–350 katalizörü göstermiştir. Katalizörlerin kalsinasyon sıcaklığının düşmesi katalitik aktivitede yükselme ile sonuçlanmıştır. Kalsinasyon sıcaklığının düşmesi Ce-O katalizöründe oksijen hareketliliğini etkileyerek daha uzun süre katalitik aktivite göstermesine neden olmuştur. 

Anahtar Kelimeler

Seryum oksit, H2S, Elementel kükürt, Seçici oksidasyon

Kaynakça

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