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

2011-12-01
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.
CHEMICAL ENGINEERING JOURNAL

Suggestions

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...
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...
A moment technique for adsorption rate on metal surfaces of supported catalysts CO adsorption on Pt-Al2O3 washcoated monolith
Dogu, G; Ozkan, G; Doğu, Timur (2001-12-15)
A moment technique was developed for the investigation of adsorption on metal surfaces of supported catalysts. The technique was applied to the evaluation of adsorption rate parameters of CO on a Pt-Al2O3 washcoated monolith. The adsorption rate constants evaluated in the temperature range 273-316 K showed significant decrease with an increase in surface coverage. Results of pulse response experiments corresponding to zero coverage gave the apparent activation energy for adsorption as 21 kJ/mol. This method...
The preparation and characterization of nano-sized Pt-Pd/C catalysts and comparison of their superior catalytic activities for methanol and ethanol oxidation
Ozturk, Zafer; Sen, Fatih; Sen, Selda; Gökağaç Arslan, Gülsün (2012-12-01)
In this study, two groups of carbon supported PtPd samples with different percentages of metals were prepared to examine the effects of Pd and stabilizing agents on the catalytic activity towards methanol and ethanol oxidation reactions. As a stabilizing agent, 1-hexanethiol and 1,1-dimethyl hexanethiol were used for group "a" and "b" catalysts, respectively. Cyclic voltammetry, chronoamperometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy, and X-ra...
The Role of precious metal nanoparticles on the oxygen exchange kinetics from ceria
Kaya, Deniz; Üner, Deniz; Kıncal, Serkan; Department of Chemical Engineering (2016)
The oxygen exchange kinetics of precious metal added ceria and ceria-alumina oxides were investigated by temperature programmed analyses and microcalorimetric measurements. 1 wt. % Pd/CeO2 and 1 wt. % Pd/Al2O3 oxides were synthesized by the incipient wetness method. 1 wt. % Pd/CeO2-Al2O3 oxides with 20 wt. %, 15 wt. % and 10 wt. % loadings of ceria were synthesized by the sequential impregnation method. Temperature programmed reduction (TPR) analysis was performed to analyze the reducibility of prepared oxi...
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.