SYNTHESIS OF DIPHENYLMETHANE OVER TUNGSTOPHOSPHORIC ACID MODIFIED H-BETA ZEOLITE CATALYSTS

Yıl 2024, Cilt: 32 Sayı: 3, 1556 - 1564

Sema Akyalçın , Levent Akyalçın , Fatma Hande Keskin , Çağan Satır

https://doi.org/10.31796/ogummf.1464296

Öz

In this study, the synthesis of diphenylmethane (DPM) from the reaction of benzene with benzyl alcohol over tungstophosphoric acid (TPA) supported on H-Beta (HB) zeolite was investigated. TPA loadings on the support zeolite ranging from 5 to 20% w/w were achieved using the wet impregnation method, and the supported catalysts were subjected to calcination treatment. The prepared catalysts were characterized by ICP-OES, XRD, nitrogen adsorption-desorption isotherms, temperature-programmed desorption of ammonia (NH3-TPD), and FT-IR. The results showed that 5%TPA-HB had a higher catalytic performance than the other prepared catalysts, with 98.9 % benzyl alcohol conversion and 87.3 % diphenylmethane selectivity. The study suggested that 5%TPA-HB has potential applications in the synthesis of DPM owing to a good combination of suitable pore size and large accessible strong acid sites.

Anahtar Kelimeler

Benzylation, Benzyl alcohol, Diphenylmethane, Heteropoly acid, H-Beta

Proje Numarası

19ADP079, 20ADP151

TUNGSTOFOSFORİK ASİTLE MODİFİYE H-BETA ZEOLİT KATALİZÖRLER VARLIĞINDA DİFENİLMETAN SENTEZİ

Öz

Bu çalışmada, H-Beta (HB) zeolit destekli tungstofosforik asit (TPA) üzerinde benzenin benzil alkol ile reaksiyonundan difenilmetan (DPM) sentezi araştırılmıştır. Destek zeoliti üzerinde ağırlıkça %5 ila %20 arasında değişen TPA yüklemeleri ıslak emdirme yöntemi kullanılarak elde edilmiş ve desteklenen katalizörler kalsinasyon işlemine tabi tutulmuştur. Hazırlanan katalizörler ICP-OES, XRD, azot adsorpsiyon-desorpsiyon izotermleri, amonyağın sıcaklık programlı desorpsiyonu (NH3-TPD) ve FT-IR ile karakterize edilmiştir. Sonuçlar, %98,9 benzil alkol dönüşümü ve %87,3 difenilmetan seçiciliği ile %5TPA-HB'nin hazırlanan diğer katalizörlerden daha yüksek bir katalitik performansa sahip olduğunu göstermiştir. Çalışma, %5TPA-HB'nin uygun gözenek büyüklüğü ve yüksek erişilebilir güçlü asit bölgelerinin iyi bir kombinasyonu sayesinde DPM sentezinde potansiyel uygulamalara sahip olduğunu göstermiştir.

Anahtar Kelimeler

Benzilasyon, Benzil alkol, Difenilmetan, Heteropoli Asit, H-Beta

Destekleyen Kurum

Eskişehir Teknik Üniversitesi, Bilimsel Araştırma Projeleri Komisyonu Başkanlığı

Proje Numarası

19ADP079, 20ADP151

Teşekkür

Bu çalışma Eskişehir Teknik Üniversitesi, Bilimsel Araştırma Proje Komisyonu tarafından 19ADP079 ve 20ADP151 numaralı projeler kapsamında desteklenmiştir. ICP-OES analizleri için ODTÜ Merkez Laboratuvarı'na (Ankara, Türkiye) teşekkür ederiz.

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