Synthesis of TPA impregnated SBA-15 catalysts and their performance in polyethylene degradation reaction


Aydemir B., SEZGİ N. A., DOĞU T.

AICHE JOURNAL, cilt.58, sa.8, ss.2466-2472, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 8
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1002/aic.12763
  • Dergi Adı: AICHE JOURNAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2466-2472
  • Anahtar Kelimeler: polyethylene, degradation, tungstophosphoric acid, impregnation, mesoporous material, catalyst, SBA-15, MESOPOROUS SILICA SBA-15, 12-TUNGSTOPHOSPHORIC ACID, ALUMINOSILICATE CATALYSTS, THERMAL-CRACKING, POLYOLEFINS, MCM-41, NMR, HETEROPOLYACIDS, POLYPROPYLENE, POLYSTYRENE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Tungstophosphoric acid (TPA)-containing mesoporous santa barbara amorphous (SBA)-15 materials were synthesized by impregnation of TPA into hydrothermally synthesized SBA-15. TPA was incorporated to the porous framework of silica with different W/Si ratios, using TPA hydrate as the acid source. The synthesized materials had a surface area range of 212-825 m2 g-1, depending on the TPA loading and exhibited Type IV adsorptiondesorption isotherms. Energy dispersive spectrometry and X-ray photoelectron spectroscopy (XPS) analyses showed that TPA was successfully penetrated into mesopores of the SBA-15 material. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis of the pyridine adsorbed synthesized materials revealed the existence of Lewis and Bronsted acid sites in the synthesized materials. Their performances were tested in the degradation of polyethylene by thermogravimetric analysis. An increase in TPA content significantly lowered the degradation temperature and activation energy of the polyethylene degradation reaction. In the presence of TPA-incorporated SBA-15 catalyst, activation energy was reduced to approximately half-value of the value found in the absence of the catalyst. (C) 2011 American Institute of Chemical Engineers AIChE J, 58: 24662472, 2012