Mineralogical study and porosimetry measurements of zeolites from Scaloma area, Thrace, Greece

Elaiopoulos, Kyriakos; Perraki, T.; Grigoropoulou, Eleni

doi:10.1016/j.micromeso.2007.10.021

Cited by 63 publications

(44 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a consequence of the grinding the newer and newer surface appears, as well as the rupture of chemical bonds occurs. In the FTIR spectra of the freshly ground sample at 60 min the band at 1011 cm -1 shifted to the left (higher wave number values), in terms of literature due to the decrease in number of Al 3+ atoms in the framework tetrahedral sites [24,30,31], so that Si 4+ become potential-determining ions.…”

Section: Zeta-potentialmentioning

confidence: 89%

“…The shoulder at 1093 cm -1 is due to the presence of cristobalite and smectite, with the possible contribution of amorphous silica [24].…”

Section: Ftirmentioning

confidence: 99%

“…Moreover, substitution of Al 3+ for Si 4+ decreases T-O-T angle, and the resulting frequency is lower, due to the weaker character and increased length of the Al-O bond, the force constant for the mode in an Al-Si-O bond is lower than the corresponding mode is a Si-O-Si linkage. Thus, it is expected that the more Al 3+ atoms are extracted from the framework, the more this band will shift to higher wave number values in the FTIR spectra [24]. At the activated sample after 60 min of grinding it shifts to 1018 cm -1 and after 360 min to 1021 cm -1 .…”

Section: Ftirmentioning

confidence: 99%

“…FTIR spectra is suitable to acquire information about the structure, structure change and the cation substitution (Si 4+ by Al 3+ ) in the tetrahedral sites of zeolite minerals [24][25][26][27][28]. The results of FTIR measurements are shown in Fig.…”

Section: Ftirmentioning

confidence: 99%

“…The vibrations in the region 1600-3700 cm -1 can be assigned to the presence of zeolite water. The bands are attributed to the hydrogen bonding of the water molecule to surface oxygen (3407 cm -1 ) and to the bending mode of water (1631 cm -1 ) [24].…”

Section: Ftirmentioning

confidence: 99%

See 4 more Smart Citations

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Bohács¹,

Faitli²,

Bokányi³

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Due to the special characteristics of zeolites, they can be applied in a very wide range of industries, i.e. agricultural, environmental or water treatment purposes. Generally, high added value zeolite products are manufactured by micro-or nanogrinding. However, these processes require high energy input and cause significant wearing of the mill parts. Therefore, the optimization of zeolite grinding, as well as the control of its properties are of a great importance. In the present paper a Hungarian natural zeolite was mechanically activated in stirred media mill for various residence times in distilled water, meanwhile the particle size distribution and the grinding energy were measured. Additionally, on-line tube rheometer was used to study the rheology of the suspension during the grinding process. The particle interaction and the suspension aggregation stability were detected by zeta-potential measurements. Structural changes due to the mechanical activation process were monitored by FTIR. It was found that the material structure of the zeolite, as well as the rheological behaviour of the zeolite suspension and its aggregation stability had been altered due to the mechanical activation in the stirred media mill. It can be concluded that the zeolite product properties can be modified by mechanical activation in order to produce a high added value tailored material.

show abstract

Section: Zeta-potentialmentioning

confidence: 89%

“…The shoulder at 1093 cm -1 is due to the presence of cristobalite and smectite, with the possible contribution of amorphous silica [24].…”

Section: Ftirmentioning

confidence: 99%

Section: Ftirmentioning

confidence: 99%

Section: Ftirmentioning

confidence: 99%

Section: Ftirmentioning

confidence: 99%

See 3 more Smart Citations

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Bohács¹,

Faitli²,

Bokányi³

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

Y zeolite equilibrium catalyst waste from fluidized catalytic cracking regenerated by electrokinetic treatment: An adsorbent for sulphur and nitrogen compounds

et al. 2018

View full text Add to dashboard Cite

The adsorption of sulphur, nitrogen, and aromatic compounds on a regenerated equilibrium catalyst (ecat-R) was studied using model and real diesel fuels. The ecat-R was obtained by electrokinetic treatment of an equilibrium catalyst (Y zeolites) waste from fluidized catalytic cracking (FCC) units. The studied model diesel fuel contained dibenzothiophene (1039 mg/L), quinoline (600 mg/L), and naphthalene (600 mg/L), as models for sulphur, nitrogen, and aromatic compounds, respectively, in n-decane as solvent. The ecat-R was characterized using X-ray diffraction, X-ray fluorescence, N 2 adsorption-desorption, thermogravimetric and differential thermal analysis, scanning electron microscopy, Fourier-transform infrared spectroscopy, and granulometry. The adsorption experiments were performed at 40 8C and 150 rpm. The results of the isotherm and kinetics studies were favourable; the material showed a high adsorption capacity for dibenzothiophene (2.8 mg S/g) and quinoline (6.3 mg N/g). The isotherm for naphthalene was less favourable (2 mg NAP/g). The process rapidly reached equilibrium in approximately 2 h. For real diesel fuel, the adsorption removal was 26 % for sulphur and 36 % for nitrogen.

show abstract

Synthesis and physicochemical characterization of nanostructured CeO₂/clinoptilolite for catalytic total oxidation of xylene at low temperature

Asgari

Haghighi

Shafiei

2012

Env Prog and Sustain Energy

View full text Add to dashboard Cite

A series of nanostructured CeO2/Clinoptilolite catalysts with different loadings of ceria were prepared by redox reaction followed by wet impregnation method and tested for oxidation of xylene. The catalysts were characterized by XRD, FESEM, BET, FTIR, and TG‐DTG analysis. XRD data confirmed the formation of CeO2 as the crystalline phase with an average crystallite size of about 11.6 nm for three ceria loading of 10, 20, and 30%. FESEM and size distribution analyses showed that nanocatalysts have nanometric particles with an average size of 37.46 nm. Specific surface analysis revealed that the synthesized nanocatalysts had large enough surface area for catalytic oxidation of p‐xylene. Furthermore, the results showed that the catalytic performance of the supported CeO2 catalysts was much higher than that of treated clinoptilolite, in particular, CeO2 (30%)/Clinoptilolite exhibited the highest conversion, 98% at 350°C. It is observed that increasing both the xylene concentration and GHSV results in decreasing of the xylene conversion; however, even at higher concentrations of xylene (3000 ppm), the nanostructured catalyst has still enough destruction ability to reduce the pollutant. A simplified reaction mechanism was proposed with respect to the behavior of adsorbed species on the catalyst surface to clarify the path through which the reaction components interact with each other. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 587–597, 2013

show abstract

Mineralogical study and porosimetry measurements of zeolites from Scaloma area, Thrace, Greece

Cited by 63 publications

References 21 publications

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Y zeolite equilibrium catalyst waste from fluidized catalytic cracking regenerated by electrokinetic treatment: An adsorbent for sulphur and nitrogen compounds

Synthesis and physicochemical characterization of nanostructured CeO₂/clinoptilolite for catalytic total oxidation of xylene at low temperature

Contact Info

Product

Resources

About

Mineralogical study and porosimetry measurements of zeolites from Scaloma area, Thrace, Greece

Cited by 63 publications

References 21 publications

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Y zeolite equilibrium catalyst waste from fluidized catalytic cracking regenerated by electrokinetic treatment: An adsorbent for sulphur and nitrogen compounds

Synthesis and physicochemical characterization of nanostructured CeO2/clinoptilolite for catalytic total oxidation of xylene at low temperature

Contact Info

Product

Resources

About

Synthesis and physicochemical characterization of nanostructured CeO₂/clinoptilolite for catalytic total oxidation of xylene at low temperature