Influence of crystallization times on the synthesis of nanosized ZSM-5

Mohamed, Reda M.; Fouad, Osama A.; Ismail, Adel A.; Ibrahim, I. A.

doi:10.1016/j.matlet.2005.06.009

Cited by 66 publications

(23 citation statements)

References 18 publications

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“…5 which shows that these zeolites crystallize in spherical shape crystals [15]. Also EDS of sample b is shown in Fig.…”

Section: Semmentioning

confidence: 80%

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Preparation and characterization of nanosized ZSM-5 zeolite using kaolin and investigation of kaolin content, crystallization time and temperature changes on the size and crystallinity of products

Khatamian

Irani

2009

JICS

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Nano sized ZSM-5 zeolite samples were synthesized successively from kaolin clay as alumina source having a large amount of quartz (39%) and silicic acid as silica source by hydrothermal treatment with NaOH in the presence of tetrapropylammonium hydroxide as a template. Then the effect of kaolin content, crystallization temperature and time on the size and crystallinity of the products were investigated. The prepared samples were characterized using XRD, SEM, EDS and FT-IR techniques. The results showed that the synthesized ZSM-5 zeolite samples were almost pure and their crystallization was almost complete. The average particle size, as determined by Debye-Scherrer equation, was in the range of 20-42 nm. Increasing kaolin content on crystal size was more effective than increase in crystallization temperature and time. Additional evidences for the nano sized ZSM-5 zeolite were the asymmetric stretch vibration band at 1225 cm -1 in the FT-IR spectra and TEM images. The scanning electron micrographs of the synthesized zeolites showed that they are spherical shape crystals.

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“…5 which shows that these zeolites crystallize in spherical shape crystals [15]. Also EDS of sample b is shown in Fig.…”

Section: Semmentioning

confidence: 80%

“…Calculation of degree of crystallinity was carried out using the IR data as follows: degree of %crystallinity = peak area at 542/peak area at 450 cm -1 [15,16].…”

Section: Characterizationmentioning

confidence: 99%

Preparation and characterization of nanosized ZSM-5 zeolite using kaolin and investigation of kaolin content, crystallization time and temperature changes on the size and crystallinity of products

Khatamian

Irani

2009

JICS

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“…Changes in catalysts' peaks with precursor of nitric acid were less. Also, the vibrational bands at 1223cm -1 is assigned to the external connections of TO 4 tetrahedrons [24][25] which was observed in all catalysts. Bands of 1634 cm -1 are assigned to the bending vibration of zeolite water molecules.…”

Section: Ftir Resultsmentioning

confidence: 72%

“…Bands of 1634 cm -1 are assigned to the bending vibration of zeolite water molecules. Two bands of 3226 and 3637 cm -1 are attributed to OH stretching vibration and Bands around 3,600 to 3500 cm -1 belong to the Brønsted acidic conditions 25 . As a result, it is attributed to bonding of the metal ion with OH (M-OH and Al-OH, respectively).…”

Section: Ftir Resultsmentioning

confidence: 99%

Effect of Supported Transition Metal Catalysts in NO Removal Reaction

Hamidzadeh¹,

Ghassemzadeh²,

Tarlani³

et al. 2016

Orient. J. Chem

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Selective catalytic reduction of nitrogen oxide with ammonia in the presence of excessive oxygen was investigated on transition metal oxides' catalysts (V, Cr, Mn, Fe) supported on HZSM-5. Meanwhile, catalyst V/ZSM-5 and Fe/ZSM-5 have shown the most activity and the conversion percentage of nitrogen oxides to nitrogen is more than 97% at temperatures above 300 °C, in these two catalysts. All synthesized catalysts possessed a good stability. Analytical characterization of synthesized catalysts were conducted by different methods of temperature programmed reduction, absorption and desorption of nitrogen, temperature programmed desorption of ammonia, X-ray diffraction and diffuse reflectance UV-vis spectroscopy. The less the apparent activation energy is, the more their activity will be. Thus, the Cr/ZSM-5 and V/ZSM-5 catalysts showed the lowest and highest performance in this process, respectively.

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“…Only the crystals of the ZSM-5 zeolite were found after 96 h. The SEM micrograph of the prepared ZSM-5 zeolite is shown in Fig. 2c, d, which shows that this zeolite crystallizes in spherical-shaped crystals (Mohamed et al 2005b). The diameter of spherical shape particles of prepared ZSM-5 zeolite is \6 lm according to the SEM picture.…”

Section: Sem and Edx Analysis Of Productsmentioning

confidence: 92%

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

2014

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The synthesis of analcime and nanosized ZSM-5 zeolites was carried out by a hydrothermal method with silica extracted from rice husk, available as an inexpensive local biowaste, and without the use of an extra alumina source. Amorphous silica (with 88 wt% of SiO 2 ) was extracted from rice husk ash by a suitable alkali solution. The effects of crystallization temperature, time and SiO 2 / Al 2 O 3 ratio of the initial system on the properties of final products were investigated. For the characterization of the synthesized product, X-ray diffraction, scanning electron microscope, energy dispersive X-ray techniques, Fourier transform infrared and Brunauer-Emmett-Teller method were applied. Crystallinity percentages of analcime and nanosized ZSM-5 were 95.86 and 89.56, respectively, with specific surface area of 353.5 m 2 g -1 for ZSM-5. The experimental results revealed that the synthesis of analcime and nanosized ZSM-5 zeolites was more practical with using silica extracted from inexpensive raw materials, while the whole crystallization process was accomplished without adding any alumina source during.

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Influence of crystallization times on the synthesis of nanosized ZSM-5

Cited by 66 publications

References 18 publications

Preparation and characterization of nanosized ZSM-5 zeolite using kaolin and investigation of kaolin content, crystallization time and temperature changes on the size and crystallinity of products

Preparation and characterization of nanosized ZSM-5 zeolite using kaolin and investigation of kaolin content, crystallization time and temperature changes on the size and crystallinity of products

Effect of Supported Transition Metal Catalysts in NO Removal Reaction

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

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