Krom ve Seryum İçeren Titanyum-Sütunlu Bentonit Katalizörlerin Sentezi, Karakterizasyonu ve Katalitik Performansı

Bu çalışmada, krom ve seryum/krom-titanyum-sütunlu bentonit katalizörler sentez sonrası emdirme yöntemi ile hazırlanmıştır. Katalizörlerin fizikokimyasal özellikleri SEM/EDS, XRD, N2-adsorpsiyon/desorpsiyon, TGA/DTA ve FTIR analiz teknikleri ile incelenmiş ve katalitik performansları diklofenakın katalitik ıslak peroksit oksidasyonunda değerlendirilmiştir. Titanyum-sütunlu bentonit katalizörün XRD deseninde katman bozulmalı yapının oluştuğu, krom ve seryum/krom emdirmeden sonrada katman bozulmalı yapının korunduğu görülmüştür. Ayrıca Titanyum-sütunlu bentonit katalizörün XRD deseninde kristalin faz olarak sadece TiO2’nin anataz fazı gözlenmiş, krom ve seryum/krom emdirilmiş örneklerde ise anataz fazı ile birlikte Cr2O3 ve/veya CeO2 fazları da gözlenmiştir. Kimyasal analiz sonuçları XRD sonuçlarını doğrulamıştır. 77 K N2-adsorpsiyon/desorpsiyon izoterm analizlerinden yüksek bağıl basınçlarda plato oluşmayan ve H3 Tip histerezis içeren Tip IIb. izotermi elde edilmiştir. Titanyum-sütunlu bentonit katalizörün yüzey özelliklerinin krom ve seryum/krom emdirmeden sonra azaldığı görülmüştür. FTIR spektrumlarında, Ti-sütun açıcılar ile sütunlandırma ile Bronsted ve Lewis pik şiddetlerinde artma gözlenmişken, seryum/krom emdirme ile bu etkinin daha da arttığı görülmüştür. Katalitik performans çalışmaları, Titanyum-sütunlu bentonit katalizörün katalitik aktivitesinin krom emdirme ile azaldığını, seryum/krom emdirme ile arttığını göstermiştir.

Anahtar Kelimeler:

Titanyum, krom, seryum/krom, sütunlu bentonit, sentez, karakterizasyon, katalitik performans

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