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

Date

2012-08-01

Author

Aydemir, Bugce
Sezgi, Naime Aslı
Doğu, Timur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

217
views

0
downloads

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

Subject Keywords

Polyethylene, Degradation, Tungstophosphoric acid, Impregnation, Mesoporous material, Catalyst, SBA-15

URI

https://hdl.handle.net/11511/31788

Journal

AICHE JOURNAL

DOI

https://doi.org/10.1002/aic.12763

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Pyrolysis of Polyethylene over Aluminum-Incorporated MCM-41 Catalyst Aydemir, Bugce; Sezgi, Naime Aslı (2016-01-01) Aluminum-containing MCM-41 catalysts were synthesized in this study by impregnation of aluminum into hydrothermally synthesized MCM-41. Aluminum was loaded into the porous framework of silica with different Al/Si ratios, using aluminum isopropoxide as the aluminum source. These catalysts exhibited Type IV adsorption-desorption isotherms and had a pore diameter of 2.4nm. Aluminum species were coordinated tetra- and octahedrally in the structure of catalysts. Diffuse Reflectance Fourier Transform Infrared Spe...
Synthesis and characterization of fully aromatic thermotropic liquid-crystalline copolyesters containing m-hydroxybenzoic acid units Yerlikaya, Z; Aksoy, S; Bayramlı, Erdal (Wiley, 2001-10-01) A series of fully aromatic copolyesters based on p-acetoxybenzoic acid (p-ABA), hydroquinone diacetate (HQDA), terephthalic acid (TPA), and m-acetoxybenzoic acid (m-ABA) were prepared by a modified melt-polycondensation reaction. The copolyesters were characterized by DSC, thermogravimetric analysis, H-1 NMR, polarized optical microscopy, X-ray diffraction, and intrinsic viscosity measurements. The copolyesters exhibited nematic liquid-crystalline phases in a broad temperature range of about 150 degreesC, w...
Dimethyl ether, diethyl ether & ethylene from alcohols over tungstophosphoric acid based mesoporous catalysts Ciftci, Aysegul; VARIŞLI, DİLEK; Tokay, Kenan Cem; Sezgi, Naime Aslı; Doğu, Timur (2012-10-01) Tungstophosphoric acid (TPA) incorporated silicate structured new mesoporous catalysts were synthesized following one-pot hydrothermal and impregnation procedures. Surface area of TPA@MCM-41, which was prepared by impregnating TPA into MCM-41, was two orders of magnitude higher than the surface area of pure TPA and this catalyst showed very high activity in dehydration reactions of both ethanol and methanol. Ethanol fractional conversion values reaching to 1.0 was obtained at 300 degrees C at a space time o...
Synthesis and optical properties of fused aromatic thienopyrazine based pi-conjugated polymers Kolay, Merve; Tarkuc, Simge; Udum, Yasemin Arslan; Toppare, Levent Kamil (IOP Publishing, 2011-07-01) Two new polythieno[3,4-b]pyrazine derivatives, poly-10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h]thieno[3,4-b]quinoxaline (PDBTQ) and poly-8,10-bis(4-hexylthiophen-2-yl)acenaphtho[1,2-b]thieno[3,4-e]pyrazine (PATP) were synthesized by electrochemical polymerization and their electrochemical properties reported. Electroactivity of the monomer and electrochemical redox behavior of its polymers were investigated by cyclic voltammetry. Spectroelectrochemical analysis was performed and the band gaps of the polymer...
Synthesis and characterization of thiophene functionalized polystyrene copolymers and their electrochemical properties Sahin, E; Camurlu, P; Toppare, Levent Kamil; Mercore, VM; Cianga, I; Yagci, Y (Wiley, 2005-12-01) Thiophene functionalized polystyrene samples (TFPS) were synthesized by atom transfer radical polymerization (ATRP) of styrene, followed by Suzuki coupling with 3-thiophene (Th) boronic acid. Conducting graft polymer of TFPS with thiophene was achieved at 1.5 V in tetrabutylammonium tetrafluoroborate/dichloromethane (TBAFB/DM) by electrochemical methods. Spectroelectrochemical analysis of the resulting copolymers [P(TFPS-co-Th)] reflected electronic transitions at 449, 721 and 880 nm, revealing pi - pi* tra...

Citation Formats

B. Aydemir, N. A. Sezgi, and T. Doğu, “Synthesis of TPA impregnated SBA-15 catalysts and their performance in polyethylene degradation reaction,” AICHE JOURNAL, pp. 2466–2472, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31788.