Hydrogenation of Citral over Ni and Ni-Sn Catalysts

Hilal AYKAÇ; Selahattin YILMAZ

Makale detayları

Hydrogenation of Citral over Ni and Ni-Sn Catalysts

Yazarlar:

Hilal AYKAÇ | Selahattin YILMAZ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2008 Vol.32 Issue 5, pp.623-635

Belge Tipi:

Makale

Yayın Tarihi:

4/2008

Belge Dili:

Türkçe

Document ID (Org No.):

2000728451

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

Liquid phase citral hydrogenation over zeolite-supported  monometallic Ni and bimetallic Ni-Sn catalysts was studied.  The  zeolite support materials were Na-Y, Na-mordenite, and clinoptilolite.  Ni and Sn contents of the monometallic and bimetallic catalysts were  8.1-9.2 wt% and 0.46 wt%, respectively.  The type of the zeolite  support affected the activity and selectivity of the catalysts  differently.  The main product of the citral hydrogenation reaction  was citronellal, for both monometallic (84.5% yield) and bimetallic  (44.5% yield) catalysts.  The addition of promoter increased the  selectivity to unsaturated alcohols (geraniol+nerol), i.e. it changed  from 0.9% to 6.3% over mordenite and from 0.9% to 2.1% over  Na-Y-supported catalysts.  Furthermore, activity of the Ni catalysts  decreased while the quantity of acetal remained almost constant.  Intimate contact between active metal, promoter, and support, and a  catalyst with a high concentration of weak acid sites gave high  selectivity to geraniol+nerol.

 

Liquid phase citral hydrogenation over zeolite-supported  monometallic Ni and bimetallic Ni-Sn catalysts was studied.  The  zeolite support materials were Na-Y, Na-mordenite, and clinoptilolite.  Ni and Sn contents of the monometallic and bimetallic catalysts were  8.1-9.2 wt% and 0.46 wt%, respectively.  The type of the zeolite  support affected the activity and selectivity of the catalysts  differently.  The main product of the citral hydrogenation reaction  was citronellal, for both monometallic (84.5% yield) and bimetallic  (44.5% yield) catalysts.  The addition of promoter increased the  selectivity to unsaturated alcohols (geraniol+nerol), i.e. it changed  from 0.9% to 6.3% over mordenite and from 0.9% to 2.1% over  Na-Y-supported catalysts.  Furthermore, activity of the Ni catalysts  decreased while the quantity of acetal remained almost constant.  Intimate contact between active metal, promoter, and support, and a  catalyst with a high concentration of weak acid sites gave high  selectivity to geraniol+nerol.

Makale detayları

Hydrogenation of Citral over Ni and Ni-Sn Catalysts

Yazarlar: Hilal AYKAÇ | Selahattin YILMAZ

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2008 Vol.32 Issue 5, pp.623-635

Belge Tipi: Makale

Yayın Tarihi: 4/2008

Belge Dili: Türkçe

Document ID (Org No.): 2000728451

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Hilal AYKAÇ | Selahattin YILMAZ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2008 Vol.32 Issue 5, pp.623-635

Belge Tipi:

Makale

Yayın Tarihi:

4/2008

Belge Dili:

Türkçe

Document ID (Org No.):

2000728451

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527