Gülşen DOĞU, Hüseyin ARBAĞ, Nail YAŞYERLİ, Sena YAŞYERLİ, Timur DOĞU

Metanın kuru reformlanma reaksiyonunda indirgeme ve reaksiyon sıcaklıklarının mezogözenekli alümina destekli nikel katalizörlerin aktivitelerine ve karbon oluşumuna etkileri

Bu çalışmada reaksiyon sıcaklığının ve reaksiyon öncesi katalizör hazırlama basamaklarından biri olanindirgeme sıcaklığının katalizörün aktivitesine ve karbon oluşumuna etkisi incelenmiştir. Çalışmada yüksekyüzey alanına sahip mezogözenekli alümina malzemesi sol-jel yöntemiyle hazırlanmıştır. Farklı oranlardanikel içerikli (ağırlıkça %16 ve %8) katalizörler tek-kap ve emdirme yöntemiyle hazırlanarak farklıindirgeme sıcaklarında (550oC ve 750oC) indirgenmişlerdir. Metanın kuru reformlanma reaksiyonları 600oC ve 750oC sıcaklıkta dolgulu kolon reaktör sisteminde yürütülmüşlerdir. İndirgeme sıcaklığındaki artışın,katalizör yapısındaki nikelin metalik Ni formuna geçmesine ve nikel metallerinin sinterleşmesi nedeniylekristal boyutunu büyüterek metan dönüşümünü ve hidrojen seçiciliğini artırdığı belirlenmiştir. Yüksekreaksiyon sıcaklıklarında metanın kuru reformlanma reaksiyonu sırasında yan reaksiyonlar olarakgerçekleşen ters su gazı ve karbon oluşum reaksiyonları azaltılabilmektedir

Effect of reduction and reaction temperature on activities of mesoporous aluminasupported nickel catalysts and coke formation in dry reforming of methane

In this study effect of one of preparation steps, reduction temperature, and reaction temperature on activityof catalyst and coke formation were investigated. Mesoporous alumina materials were prepared by followinga sol-gel method. The catalysts with different nickel amount (16 wt% and 8 wt%) were synthesized via onepot and impregnation methods and reduced at different reduction temperatures (550oC and 750oC). Dry reforming of methane reaction was performed at 600oC and 750oC in a packed bed reactor system. It wasobserved that increase in the reduction temperature led nickel in the structure of the catalyst to form metallicNi and increased the crystal size of Ni through sintering and changed the fractional methane conversion andselectivity of hydrogen. At high reaction temperature occurrence of reverse water gas shift and cokeformation reactions as side reactions of dry reforming of methane could be reduced

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