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Effects of Material Characteristics on the Performance of Hydrocracking Catalysts

Journal Name:

  • Journal of The Turkish Chemical Society, Section B: Chemical Engineering

Publication Year:

  • 2016

Key Words:

Keywords (Original Language):

Author NameUniversity of Author
Abstract (2. Language): 
Hydrocracking is a refinery process used to convert heavy hydrocarbon fractions to lighter cuts with high added value. The products that usually range from heavy diesel to light naphtha involving middle distillate as targeted cut are obtained as a result of hydrocracking process of feeding with higher molecular weights and lower hydrogen/carbon ratios. Hydrocracking reactions occur under high hydrogen partial pressures and temperatures in the presence of catalyst in order to remove impurities such as sulfur compounds and crack heavy hydrocarbon molecules to high added value lighter cuts. Hydrocracking catalysts are bifunctional in which metal function with hydrogenation consisting group VIB or group VIIIB is for removal of impurities and acidic support consisting amorphous oxides and/or crystalline zeolites to realize cracking function. In this study, the association between the performance test results obtained from laboratory scale reactor system and the material characteristics of the catalysts are viewed. Selectivity, hydrocracking, and hydrogenation activities within the performance parameters of the catalysts are calculated based on the fraction ratios and feed-product properties. Furthermore, the effect of hydro-treating activity on hydrocracking activity is also highlighted. The surface area and pore size, crystallinity, chemical composition of the material and acidic properties are investigated within the scope of material characteristics of the catalysts by using BET, XRD, XRF, NH3-TPD techniques, respectively.
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Abstract (Original Language): 
Hidro-kraking ağır hidrokarbon fraksiyonlarını daha küçük ve katma değeri daha fazla olanlara çevirmek için kullanılan bir rafineri sürecidir. Hedeflenen kısımlar olarak orta distilatları içeren ağır dizelden hafif naftaya kadar uzanan bir seri elde edilir daha yüksek moleküler ağırlık ve dah a düşük hidrojen/karbon oranları elde edilmiş olur. Hidro-kraking tepkimeleri yüksek hidrojen kısmi basınçları ve yüksek sıcaklıklarda, katalizör varlığında oluşur, kükürtlü bileşikler gibi safsızlıklar bu esnada ortamdan uzaklaştırılmış olur ve ağır hidrokarbon molekülleri yüksek katma değerli ve daha hafif türevlere dönüşür. Hidro-kraking katalizörleri iki fonksiyonludur ve VIB veya VIIIB grubundan bir metal hidrojenlemede safsızlıkları gidermek için ve amorf oksitler ve/veya kristal zeolitler de kraking işlevini yerine getirecek asidik fonksiyonları barındırır. Bu çalışmada, laboratuar reactor sisteminden gelen performans test sonuçları ile katalizörlerin malzeme karakteristikleri arasındaki uyum izlenecektir. Katalizörlerin performans parametreleri içindeki seçimlilik, hidrokraking ve hidrojenleme aktiviteleri fraksiyon oranlar ıve akış ürün özelliklerine dayanan hesaplamalarla bulunmuştur. Bunun ötesinde, hidrokraking aktivitesi üzerine hidro-muamele aktivitesinin etkisi de ortaya konmuştur. Yüzey alanı ve gözenek boyutu, kristallik, malzemenin kimyasal bileşimi ve asidik özellikleri sırasıyla BET, XRD, XRF, NH3-TPD teknikleri ile yapılmıştır.
FULL TEXT (PDF): 
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