Acidity of Silica-Alumina Catalysts By Amine Titration Using Hammett Indicators and FT-IR Study of Pyridine Adsorption

Mürüvvet YURDAKOÇ; Mehmet AKÇAY; Yalçın TONBUL; Kadir YURDAKOÇ

Makale detayları

Acidity of Silica-Alumina Catalysts By Amine Titration Using Hammett Indicators and FT-IR Study of Pyridine Adsorption

Yazarlar:

Mürüvvet YURDAKOÇ | Mehmet AKÇAY | Yalçın TONBUL | Kadir YURDAKOÇ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 1999 Vol.23 Issue 3, pp.319-328

Belge Tipi:

Makale

Yayın Tarihi:

2/1999

Belge Dili:

Türkçe

Document ID (Org No.):

2000730417

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

In this study, characterization and surface acidity of Siral  (SiO2-Al2O3) compounds were investigated with Hammett acidity  functions, the n-butylamine titration method and FTIR analysis of the  spectra of pyridine adsorption.  All the samples had an acid strength  of H0\leq+2.8.  The calculated total amount of acid of the samples  increased with the increase in SiO2 content up to Siral 40 and then  decreased sharply in the case of Siral 80.  Maximum amount of acidity  was observed in the case of Siral 40 as 1.37mmole/g.  No evidence was  found for a band at 1540 cm-1 on Pural indicating that there were  no Bronsted sites on the surface strong enough to react with pyridine.   As a result, we can say that the Lewis sites predominate in all the  silica-aluminas.

 

In this study, characterization and surface acidity of Siral  (SiO2-Al2O3) compounds were investigated with Hammett acidity  functions, the n-butylamine titration method and FTIR analysis of the  spectra of pyridine adsorption.  All the samples had an acid strength  of H0\leq+2.8.  The calculated total amount of acid of the samples  increased with the increase in SiO2 content up to Siral 40 and then  decreased sharply in the case of Siral 80.  Maximum amount of acidity  was observed in the case of Siral 40 as 1.37mmole/g.  No evidence was  found for a band at 1540 cm-1 on Pural indicating that there were  no Bronsted sites on the surface strong enough to react with pyridine.   As a result, we can say that the Lewis sites predominate in all the  silica-aluminas.

Makale detayları

Acidity of Silica-Alumina Catalysts By Amine Titration Using Hammett Indicators and FT-IR Study of Pyridine Adsorption

Yazarlar: Mürüvvet YURDAKOÇ | Mehmet AKÇAY | Yalçın TONBUL | Kadir YURDAKOÇ

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 1999 Vol.23 Issue 3, pp.319-328

Belge Tipi: Makale

Yayın Tarihi: 2/1999

Belge Dili: Türkçe

Document ID (Org No.): 2000730417

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Mürüvvet YURDAKOÇ | Mehmet AKÇAY | Yalçın TONBUL | Kadir YURDAKOÇ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 1999 Vol.23 Issue 3, pp.319-328

Belge Tipi:

Makale

Yayın Tarihi:

2/1999

Belge Dili:

Türkçe

Document ID (Org No.):

2000730417

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527