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

Yıl 2017, Cilt: 8 Sayı: 1, 66 - 77, 03.04.2017

Fatma Tomul

Öz

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

Kaynakça

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