ChemInform Abstract: LASER RAMAN POLARIZATION SPECTRA OF NATURAL ZEOLITE-NATROLITE

1982 ◽  
Vol 13 (13) ◽  
Author(s):  
F. PECHAR ◽  
I. GREGORA ◽  
D. RYKL
Keyword(s):  
Natural Zeolite ◽  
Laser Raman ◽  
Polarization Spectra

Laser Raman polarization spectra of natural zeolite-natrolite

1981 ◽  
Vol 46 (12) ◽  
pp. 3043-3048 ◽  
Author(s):  
František Pechar ◽  
Ivan Gregora ◽  
Drahoš Rykl
Keyword(s):  
Single Crystal ◽  
Crystal Lattice ◽  
Natural Zeolite ◽  
Room Temperature ◽  
Water Molecules ◽  
Laser Raman ◽  
Polarization Spectra ◽  
Internal Vibrations

Raman polarization spectra of single crystal of natrolite Na2Al2Si3O10.2 H2O have been measured in the region 4 000 to 50 cm-1 at room temperature. The spectra have been measured in the conventional rectangular geometry. The found maxima of the polarization spectra of single crystal of the mineral investigated can be divided into four groups according to pertinence to individual vibrations: (i) translation and rotation vibrations of water molecules in interaction with the crystal lattice, (ii) internal vibrations of the bonds Al-O, Si-O inside the tetrahedrons, (iii) internal vibrations of bonds of the water molecules, (iv) external vibrations between the (Al,Si)O4 tetrahedrons.

LASER-RAMAN STUDY OF THE STRUCTURE OF SILVER DOPED As40S60GLASS

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-903-C4-906 ◽  
Author(s):  
A. P. Firth ◽  
A. E. Owen ◽  
P. J. Ewen
Keyword(s):  
Laser Raman ◽  
Raman Study

LASER RAMAN MICROPROBING TECHNIQUES

1984 ◽  
Vol 45 (C2) ◽  
pp. C2-249-C2-253 ◽  
Author(s):  
P. Dhamelincourt ◽  
J. Barbillat ◽  
M. Delhaye
Keyword(s):  
Laser Raman

Microstructures and Properties of WC/Natural Zeolite Composites

2012 ◽  
Vol 27 (2) ◽  
pp. 129-133
Author(s):  
Yi-Fan ZHENG ◽  
Na ZHAO ◽  
Jie ZHANG ◽  
Xiao-Ye YU ◽  
Wei-Min MO
Keyword(s):  
Natural Zeolite

ION Exchange Characterisation of Modified Zeolite

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2269-2272 ◽  
Author(s):  
Š Cerjan-Stefanovic ◽  
M. Kaštelan-Macan ◽  
T. Filipan
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Natural Zeolite ◽  
Deionized Water ◽  
Isomorphous Substitution ◽  
Waste Waters ◽  
Modified Zeolite ◽  
Water Drinking

Isomorphous substitution of phosphorus into a natural zeolite affords the possibility to change the overall framework charge from negative to positive. The substances so created should be used for purification of waste waters. The work describes the preparation of phosphated zeolite, their characterisation and examples of their anion exchange of NO3 on observed in deionized water, drinking water and in the solution containing varying amounts of nitrate.

Life Time Improvement of Hierarchically Structured SAPO-34 Nanocatalyst in MTO Reaction via Applying Clinoptilolite, Investigating of Composite Design via RSM

2020 ◽  
Vol 23 ◽  
Author(s):  
Reza Yazdanpanah ◽  
Eshagh Moradiyan ◽  
Rouein Halladj ◽  
Sima Askari
Keyword(s):  
Surface Area ◽  
Natural Zeolite ◽  
Coke Formation ◽  
Life Time ◽  
Weight Percent ◽  
Light Olefins ◽  
Bet Surface Area ◽  
Relative Crystallinity ◽  
Mto Reaction ◽  
The Common

Aim and Objective: The research focuses on recent progress in the production of light olefins. Hence, the common catalyst of the reaction (SAPO-34) deactivates quickly because of coke formation, we reorganized the mechanism combining SAPO-34 with a natural zeolite in order to delay the deactivation time. Materials and Methods: The synthesis of nanocomposite catalyst was conducted hydrothermally using experimental design. Firstly, Clinoptilolite was modified using nitric acid in order to achieve nano scaled material. Then, the initial gel of the SAPO-34 was prepared using DEA, aluminum isopropoxide, phosphoric acid and TEOS as the organic template, sources of Aluminum, Phosphor, and Silicate, respectively. Finally, the modified zeolite was combined with SAPO-34's gel. Results: 20 different catalysts due to D-Optimal design were synthesized and the nanocomposite with 50 weight percent of SAPO-34, 4 hours Crystallization and early Clinoptilolite precipitation showed the highest relative crystallinity, partly high BET surface area and hierarchical structure. Conclusion: Different analysis illustrated the existence of both components. The most important property alteration of nanocomposite was the increment of pore mean diameters and reduction in pore volumes in comparison with free SAPO-34. Due to low price of Clinoptilolite, the new catalyst develops the economy of the process. Using this composite, according to formation of multi-sized pores located hierarchically on the surface of the catalyst and increased surface area, significant amounts of Ethylene and Propylene, in comparison with free SAPO-34, were produced, as well as deactivation time that was improved.

COPPER (Cu2+) REMOVAL FROM WATER USING NATURAL ZEOLITE FROM GEDANGSARI, GUNUNGKIDUL, YOGYAKARTA

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Wahyu Wilopo ◽  
Septiawan Nur Haryono ◽  
Doni Prakasa Eka Putra ◽  
I Wayan Warmada ◽  
Tsuyoshi Hirajima
Keyword(s):  
Waste Water ◽  
Economic Growth ◽  
Heavy Metals ◽  
Natural Zeolite ◽  
Adsorption Equilibrium ◽  
Waste Water Treatment ◽  
Batch Test ◽  
Maximum Capacity ◽  
Geological Materials ◽  
Langmuir Adsorption

Development of indusrialization and urbanization not only increase economic growth but also contribute to the environmental degradation, especially contamination of heavy metals in water. In other side, there are many geological materials have capability to immobilize heavy metals. Therefore, the objective of this research is to know the maximum capacity of natural zeolite from Trembono area, Gunung Kidul regency to immobilize copper (Cu2+) from water and to understand their mechanism. This experiment was carry out by a batch test. The result showed that the maximum capacity of zeolite to immobilize Cu (qmax) is 63,69 mmolCu/kg Zeolite according to Langmuir adsorption equilibrium model. In addition, the capability to immobilize Cu will increases due to decreasing the grain size. The result of this research can be used as an alternative for waste water treatment, especially Cu. Keywords: Removal, copper (Cu2+), natural zeolite, Langmuir isotherm

Absorption and polarization spectra of polynuclear p-quinones

1974 ◽  
Vol 39 (6) ◽  
pp. 1532-1540 ◽  
Author(s):  
A. Novák ◽  
M. Titz ◽  
M. Nepraš
Keyword(s):  
Polarization Spectra
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