The synthesis and characterization of aluminum loaded SBA-type materials as catalyst for polypropylene degradation reaction

Date

2011-12-01

Author

Obali, Zeynep
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

223
views

0
downloads

The performance of pure and aluminum containing SBA-type catalysts prepared using different aluminum sources and different Al/Si ratios were investigated in the polypropylene degradation reaction using a thermogravimetric analyzer. For the synthesis of catalysts, aluminum isopropoxide and aluminum sulphate were used as the aluminum sources. Synthesized materials had high surface areas and exhibited nitrogen adsorption isotherms of type IV. EDS results showed that the aluminum incorporation into the structure was very effective. Al-27 MAS NMR spectra of the catalysts exhibited tetrahedrally and octahedrally coordinated aluminum species in the structure. TEM images of synthesized catalysts showed well-ordered hexagonal arrays of uniform mesopores with cylindrical channels. With the aluminum loading, DRIFTS analysis of the pyridine adsorbed materials revealed the existence of Bronsted acid sites in the synthesized catalysts in addition to Lewis acid sites. Thermogravimetric analysis results showed a marked reduction in the degradation temperature in the presence of aluminum containing SBA-type catalysts. The activation energy value of the degradation reaction decreased to about 51-70 kJ/mole in the presence of catalysts synthesized using aluminum sulphate as the aluminum source and when aluminum isopropoxide was used as the aluminum source activation energy value of the reaction decreased to 82-89 kJ/mol.

Subject Keywords

Catalytic Degradation, Polypropylene, Mesoporous, Catalyst-SBA15-TGA

URI

https://hdl.handle.net/11511/31358

Journal

CHEMICAL ENGINEERING JOURNAL

DOI

https://doi.org/10.1016/j.cej.2011.04.063

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

The effect of SN content and isothermal transformation temperature on the mechanical properties of austempered ductile cast iron Özcan, Alper; Atala, Haluk; Department of Metallurgical and Materials Engineering (2003) In this study the effects of Sn content and isothermal transformation temperature on the ultimate tensile strength (UTS), elongation and hardness of austempered ductile cast iron (ADI) was investigated. To determine the possible effect of Sn on these properties the Sn content of standard GGG30, GGG40 and GGG50 materials were taken as reference, whose chemical compositions vary from 0,016 to 0,050% in terms of Sn. However the Sn content was increased to a maximum of 0,26% for investigating the effect of Sn o...
Performance of Acidic MCM-Like Aluminosilicate Catalysts in Pyrolysis of Polypropylene Obali, Zeynep; Sezgi, Naime Aslı; Doğu, Timur (2009-01-01) Mesoporous aluminosilicate catalysts having different Al/Si ratios were synthesized following a hydrothermal synthesis route and using different aluminum sources, such as aluminum nitrate and aluminum isopropoxide. These mesoporous materials have high surface areas, in the range of 520-1001 m(2)/g, and exhibit Type IV nitrogen adsorption isotherms. EDS and Al-27 MAS NMR results showed that aluminum was incorporated more effectively into the structure of the catalyst forming a tetrahedral framework when alum...
A study on hydroxyl terminated polyether based composite propellants Eşiyok, Hacı; Yılmazer, Ülkü; Department of Chemical Engineering (2016) The present study was aimed at investigating the effects of isocyanate, chain extender and curing catalyst types on the mechanical, structural and thermal properties of Hydroxyl Terminated Polyether (HTPE) based gumstock samples and the effects of oxidizer, energetic plasticizer, and ballistic modifier types on the ballistic and thermal properties of propellant samples. HTPE based polyurethane networks were synthesized by hand mixing and applying vacuum for degassing of resulting mixtures. After curing, the...
The use of pyrolysis mass spectrometry to investigate polymerization and degradation processes of methyl amine-based benzoxazine Bagherifam, Shahla; Uyar, Tamer; Ishida, Hatsuo; Hacaloğlu, Jale (2010-06-01) In this study, direct pyrolysis mass spectrometry, DP-MS, was applied to investigate curing and polymerization mechanisms of phenol and methyl amine-based benzoxazine monomer, and thermal decomposition and crosslinking characteristics of the corresponding polybenzoxazine. The results indicated opposing polymerization reaction routes besides the generally accepted one. The cleavage of C-O bonds of the oxazine rings either followed by transformation into a polymer constituting ortho or para substituted phenol...
The effect of triethanolamine on thermal decomposition of GAP Fazhoğlu, Hatice; Hacaloğlu, Jale (2002-01-01) The effect of triethanolamine (TEA) on thermal behavior of glycidyl azide polymer (GAP) has been investigated by direct pyrolysis mass spectrometry technique. It has been observed that thermal degradation of GAP-TEA mixture also begins with the cleavage of the side groups as in the case of GAP. Again, the main decomposition started with the elimination of molecular nitrogen from the azide functional group, and a quite similar degradation mechanism has been proposed. The increase in the thermal stability of ...

Citation Formats

Z. Obali, N. A. Sezgi, and T. Doğu, “The synthesis and characterization of aluminum loaded SBA-type materials as catalyst for polypropylene degradation reaction,” CHEMICAL ENGINEERING JOURNAL, pp. 202–210, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31358.