Ni-Co içerikli bimetalik katalizörlerin metanın kuru reformlanma reaksiyonundaki performanslarına katalizör sentez sürecindeki emdirme sırasının etkileri
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Date
2017-02-20
Authors
Arbağ, Hüseyin
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Publisher
Uludağ Üniversitesi
Abstract
Bu çalışmada, mezogözenekli alümina destekli bimetalik Ni ve Co katalizörler sıralı emdirme yöntemiyle hazırlanmışlardır. Hazırlanan mezogözenekli bimetalik katalizörlerin aktiviteleri 750 oC'de metanın kuru reformlanma reaksiyonunda test edilmiştir. Katalizörlerin reaksiyon öncesi ve/veya sonrası N2 adsorpsiyon/desorpsiyon, XRD, TPR, SEM/EDX ve TG/DT analizleri yürütülmüştür. TPR analizleri, Ni ve Co metallerinin katalizör yapısına emdirme sırasının katalizör yapısındaki metallerin indirgenebilirliğini etkilediğini göstermiştir. Co-Ni içerikli bimetalik katalizörlerin hazırlanmasında emdirme sırasının katalizör içindeki metallerin indirgenmelerini ve dolayısıyla katalitik performanslarını önemli ölçüde etkilediği gösterilmiştir. Önce Ni sonra Co yüklenerek hazırlanan katalizörde kobaltın daha fazla indirgenmiş olduğu ve dolayısıyla Co@Ni@SGA katalizörünün daha kararlı ve yüksek aktivite gösterdiği bulunmuştur. Bimetalik Ni-Co katalizörler metanın kuru reformlanma reaksiyonuna yüksek aktivite gösterirken, karbon oluşumuna da yüksek direnç göstermişlerdir. Metanın kuru reformlanma reaksiyonunda yüksek aktivite gösteren Co@Ni@SGA katalizörünün üzerinde biriken karbon miktarı (kütlece %3,6), Ni@Co@SGA katalizörüne (kütlece %2,1) göre daha yüksektir. Elde edilen ürün dağılımındaki H2/CO oranı 0,78 olarak belirlenmiştir.
In this study, mesoporous alumina supported bimetallic Ni-Co catalysts were synthesized using sequential impregnation method. The synthesized catalysts were tested in dry reforming of methane at 750 oC. Before and/or after activity test, N2 adsorption/desorption, XRD, TPR, SEM/EDX, and TG/DT analyses were performed for the catalysts. TPR analysis showed that impregnation sequence of Ni and Co metals effects reducibility of the metal in the structure of the catalysts. It was shown that impregnation sequence of Ni-Co bimetallic catalysts significantly effects the reducibility of metals in the structure and accordingly the catalytic performance of these catalysts. It was found that cobalt was more reducible in the catalyst which was prepared by impregnation of Ni first followed by impregnation of Co. Co@Ni@SGA catalyst prepared this way showed more stable and high catalytic activity. Bimetallic NiCo catalysts showed high activity with a high resistance to coke formation, in dry reforming of methane. Amount of coke formation (3.6% by wt) over Co@Ni@SGA catalyst (which showed higher activity in dry reforming of methane) was higher than the amount of coke (2.1% by wt) over Ni@Co@SGA catalyst. H2/CO ratio in product stream was obtained as 0.78.
In this study, mesoporous alumina supported bimetallic Ni-Co catalysts were synthesized using sequential impregnation method. The synthesized catalysts were tested in dry reforming of methane at 750 oC. Before and/or after activity test, N2 adsorption/desorption, XRD, TPR, SEM/EDX, and TG/DT analyses were performed for the catalysts. TPR analysis showed that impregnation sequence of Ni and Co metals effects reducibility of the metal in the structure of the catalysts. It was shown that impregnation sequence of Ni-Co bimetallic catalysts significantly effects the reducibility of metals in the structure and accordingly the catalytic performance of these catalysts. It was found that cobalt was more reducible in the catalyst which was prepared by impregnation of Ni first followed by impregnation of Co. Co@Ni@SGA catalyst prepared this way showed more stable and high catalytic activity. Bimetallic NiCo catalysts showed high activity with a high resistance to coke formation, in dry reforming of methane. Amount of coke formation (3.6% by wt) over Co@Ni@SGA catalyst (which showed higher activity in dry reforming of methane) was higher than the amount of coke (2.1% by wt) over Ni@Co@SGA catalyst. H2/CO ratio in product stream was obtained as 0.78.
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Keywords
Metanın kuru reformlanma reaksiyonu, Mezogözenekli alümina, Nikel, Kobalt, Bimetalik, Dry reforming of methane, Mesoporous alumina, Nickel, Cobalt, Bimetallic
Citation
Arbağ, H. (2017). "Ni-Co içerikli bimetalik katalizörlerin metanın kuru reformlanma reaksiyonundaki performanslarına katalizör sentez sürecindeki emdirme sırasının etkileri". Uludağ Üniversitesi Mühendislik Fakültesi Dergisi, 22(1), 39-52.