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PROPANIN OKSİDATİF DEHİDROJENASYONU İÇİN DOĞRUDAN SENTEZ VE EMDİRME YÖNTEMLERİYLE HAZIRLANMIŞ MCF DESTEKLİ V-Mo-Nb KATALİZÖRLERİ

MCF SUPPORTED V-Mo-Nb CATALYSTS PREPARED BY DIRECT HYDROTHERMAL SYNTHESIS AND IMPREGNATION METHODS FOR OXIDATIVE DEHYDROGENATION OF PROPANE

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Vanadium (V), molybdenum (Mo) and niobium (Nb) incorporated MCF (“Mesocellular Silica Foams”) supported catalysts were prepared by direct hydrothermal (V-Mo-Nb-MCF) and impregnation (V-Mo-Nb@MCF) methods for oxidative dehydrogenation of propane (ODHP) to produce propylene. Also, different amounts of V (V/Si mole ratios: 0.031, 0.062, 0.124) incorporated MCF supported V-MCF catalysts were synthesized by direct hydrothermal method and tested for ODHP reaction. The XRD patterns of V-MCF and V-Mo-Nb-MCF catalysts showed that there was no peak corresponding to V, Mo and Nb metals at high 2θ region. MoO3 peak was observed in the XRD pattern of V-Mo-Nb@MCF catalyst prepared by the impregnation method. BET surface areas of the catalysts synthesized by hydrothermal method (664-996 m2/g) were found to be higher than the surface area of the catalyst prepared by impregnation method (270 m2/g). Using Mo and Nb metals together with V in the V-Mo-Nb@MCF catalyst prepared by impregnation increased propane conversion (up to 12%) and decreased propylene selectivity on ODHP catalytic test studies (550oC; O2/C3H8/He:3/6/21) in the fixed bed reactor system. The propane conversion value of V-Mo-Nb-MCF catalysts synthesized by hydrothermal route was low while the propylene selectivity (81%) of this catalyst was found to be significantly high.
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Abstract (Original Language): 
Propanın oksidatif dehidrojenasyonu (PODH) ile propilen eldesi için MCF (“Mesocellular Silica Foams”) destekli vanadyum (V), molibden (Mo) ve niyobyum (Nb) içeren katalizörler doğrudan hidrotermal (V-Mo-Nb-MCF) ve emdirme (V-Mo-Nb@MCF) yöntemleri ile hazırlanmıştır. Ayrıca, farklı oranlarda vanadyum (V/Si mol oranı: 0,031, 0,062, 0,124) içeren MCF destekli V-MCF katalizörleri doğrudan hidrotermal yöntem ile hazırlanarak PODH reaksiyonunda test edilmiştir. Hidrotermal yöntem ile hazırlanan V-MCF ve V-Mo-Nb-MCF katalizörlerinin X-ışını kırınım desenlerinde, V, Mo ve Nb metallerine ait pik gözlenmemiştir. Emdirme yöntemi ile hazırlanan V-Mo-Nb@MCF katalizörünün XRD desenlerinde MoO3 yapısına ait pikler gözlenmektedir. Hidrotermal yöntem ile hazırlanan katalizörlerin yüzey alanı değerleri (664-996 m2/g) emdirme yöntemi ile hazırlanan katalizörlerin yüzey alanı değerlerinden (270 m2/g) yüksek bulunmuştur. Sabit yatak reaktör sisteminde yürütülen PODH reaksiyonu katalitik test çalışmalarında (550oC; O2/C3H8/He:3/6/21) V ile beraber Mo-Nb metallerinin kullanılmasının emdirme yöntemi ile hazırlanan V-Mo-Nb@MCF katalizöründe propan dönüşümünü arttırdığı (%12), propilen seçiciliğini azalttığı gözlenmiştir. Ayrıca, hidrotermal sentez yöntemi ile hazırlanan V-Mo-Nb-MCF katalizörünün propan dönüşümünün düşük ancak, oldukça yüksek (%81) propilen seçiciliği olduğu belirlenmiştir.
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