Çiğdem OKUTAN, Hüseyin ARBAĞ, Nail YAŞYERLİ, Sena YAŞYERLİ

Metanın kuru reformlanma reaksiyonunda karbon oluşumunu azaltan Zr-SBA-15 destekli Ni katalizörlerin geliştirilmesi: Sentez ortamının etkisi

Metanın kuru reformlanması ile sentez gazı üretimi için karbon oluşumunu azaltabilecek Zr içerikli SBA-15 destekli Ni katalizörlerin geliştirilmesi amaçlanmıştır. Bu çalışmada, Zr içerikli SBA-15 destek malzemeleri HCl (A), NaCl (S) ve HCl ile NaCl’ün (B) birlikte ilave edildiği farklı koşullardaki tek-kap hidrotermal sentez yöntemiyle hazırlanmıştır. Zr-SBA-15 malzemelerinin destek olarak kullanıldığı Ni katalizörleri emdirme yöntemi ile hazırlanmıştır. Farklı sentez koşullarında hazırlanan Zr-SBA-15 destekli Ni katalizörlerinin aktiviteleri metanın kuru reformlanma reaksiyonunda sabit yatak reaktör sisteminde 750 °C’de test edilmiştir. Katalitik aktivite ve katalizör özellikleri arasındaki ilişkinin açıklanabilmesi amacıyla reaksiyon öncesi ve/veya sonrası XRD, N2 adsorpsiyon-desorpsiyon, ICP-OES, DRIFTS, SEM, TEM ve TG analizleri gerçekleştirilmiştir. HCl varlığında sentezlenen Zr-SBA-15 destekli Ni (5Ni@10Zr ̶ A) katalizörde diğer iki katalizörden (5Ni@10Zr ̶ B ve 5Ni@10Zr ̶ S) farklı olarak kısa ve hekzagonal şeklinde yapıların oluşumu gözlenmiştir. Farklı morfolojiye sahip olan 5Ni@10Zr ̶ A katalizörünün yapısında bulunan kütlece % 4,5 Zr miktarının katalizörün aktivitesini artırdığı (%85 CH4 ve %88 CO2 dönüşümü) ve karbon birikimini önemli derecede azalttığı belirlenmiştir. Bunun yanı sıra en yüksek H2/CO oranı ve H2 verimi sırasıyla 0,79 ve 1,37 olarak 5Ni@10Zr ̶ A katalizörü ile elde edilmiştir.

Anahtar Kelimeler:

Kuru reformlanma, SBA-15, Hidrojen, Zr, tek-kap

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