Liquid phase hydrogenation of citral on zeolite supported monometallic (Ni,Pt) and bimetallic (ni-Sn.Pt-Sn) catalysts
tarafından
 
Güleç, Hilal.

Başlık
Liquid phase hydrogenation of citral on zeolite supported monometallic (Ni,Pt) and bimetallic (ni-Sn.Pt-Sn) catalysts

Yazar
Güleç, Hilal.

Yazar Ek Girişi
Güleç, Hilal.

Yayın Bilgileri
[s.l.]: [s.n.], 2005.

Fiziksel Tanımlama
xiii, 103 leaves.: ill+ 1 computer laser optical disc

Genel Not
Keywords: Citral hydrogenation, clinoptilolite, zeolite Y, zeolite beta.

Özet
In this study the liquid phase citral hydrogenation reaction over zeolite supported monometallic and bimetallic Ni and Pt catalysts was studied. The zeolite support materials were Na-Y, Na-, Na-Mordenite, MCM-41, and Clinoptilolite. The catalysts were prepared by impregnation and co-impregnation techniques. Catalytic activity and selectivity tests were performed in a semi-batch reactor at 80°C temperature, 6 bar pressure and 600 rpm stirring speed with 0.25 g catalyst. The characterization studies showed that the structures of support materials were preserved during impregnation and co-impregnation. The Ni and Pt contents of the catalysts was around 8.5 % and 5 %, respectively while the Sn content changed between 0.46 and 4.10 %. The activity of the catalysts and product distribution were affected by type of active metal and type of support. The major product over monometallic and bimetallic catalysts was citronellal. The Ni/Na-Y catalyst gave the maximum yield of desired products, unsaturated alcohols and citronellal, (93 %) and citral conversion (>99 %) among the monometallic catalysts. The most selective monometallic Pt catalyst to desired products was Pt /MCM-41 with a yield of 40 %. Addition of Sn increased the unsaturated alcohol formation and decreased the acetal formation. The activity of the Ni catalyst was generally decreased while the activity of the Pt catalyst was improved. The amount of unsaturated alcohols increased with Sn/Sn+Ni ratio for bimetallic Ni catalysts. The highest yield of desired products was obtained with Ni/Na-Y (93 %) and with Ni-Sn/MCM (80 %) among monometallic and bimetallic catalysts.

Konu Başlığı
Catalysts
 
Citrates
 
Zeolites
 
Clinoptilolite

Yazar Ek Girişi
Yılmaz, Selahattin

Tüzel Kişi Ek Girişi
İzmir Institute of Technology. Chemical Engineering.

Tek Biçim Eser Adı
Thesis (Master)--İzmir Institute of Technology:Chemical Engineering.
 
İzmir Institute of Technology:Chemical Engineering--Thesis (Master).

Elektronik Erişim
Access to Electronic Version.


LibraryMateryal TürüDemirbaş NumarasıYer Numarası
IYTE LibraryTezT000398QD501.G54 2005 C.1