Preparation of AgY zeolite and study on its adsorption equilibrium and kinetics

Song, Hua; Jiang, Bolong; Song, Hualin; Jin, Zaishun; Sun, Xiu‐Li

doi:10.1007/s11164-013-1493-5

Cited by 18 publications

(11 citation statements)

References 21 publications

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“…Changes in peaks intensities and slight shifts are observed when sodium cations are replaced by other silver or zinc cations. These results were already observed in the literature [ 33 , 44 , 45 , 46 , 47 , 48 ] and were explained as a consequence of the difference of the scattering power which is specific to each cation and also by a slightly different sites occupation in the pores [ 33 , 48 , 49 ].…”

Section: Resultssupporting

confidence: 77%

Synthesis of FAU-Type Zeolite Membranes with Antimicrobial Activity

et al. 2020

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In this study, a layer of a pure and dense phase of FAU-type zeolite was synthesized directly on the surface of α-Al2O3 plane macroporous support. Before hydrothermal synthesis, a step of cleaning of the support by an anionic detergent was performed, a roughness surface is created, allowing the anchoring of the zeolite nuclei and then their growth, favoring in this sense the formation of a homogeneous zeolite layer. The obtained membranes were fully characterized using X-ray diffraction analysis (XRD), nitrogen sorption, scanning electron microscopy (SEM), and mercury porosimetry. After 24 h of thermal treatment at 75 °C, a homogeneous zeolite layer composed of bipyramidal crystals of FAU-type zeolite is obtained with a thickness of about 2.5 µm. No obvious defects or cracks can be observed. It was found that the increase in heating temperature could lead to the appearance of an impurity phase, GIS-type zeolite. Then the ideal zeolite membrane was exchanged with Ag+ or Zn2+ cations to studies their antimicrobial properties. Zeolites membranes exchanged with Ag+ showed an agar-diffusive bactericidal activity against gram negative Escherichia coli (E. coli) bacteria. Zn2+ exchanged zeolite membrane presented a bacteriostatic activity that is less diffusive in agar. As expected, non-exchanged zeolite membrane (in its Na+ form) have no effect on bacterial activity. This process is particularly interesting for the synthesis of a good quality FAU-type zeolite membranes with antimicrobial properties.

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Section: Resultssupporting

confidence: 77%

Synthesis of FAU-Type Zeolite Membranes with Antimicrobial Activity

et al. 2020

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“…Jiang and Ng (2010) and Sari et al (2007) reported similar behavior for removal of sulfur components from gasoil onto NaY zeolite. Song et al (2015) obtained an increase in sulfur adsorption capacity of AgY zeolite at higher temperatures. Also, Singh et al (1988) have used red mud for the removal of 1-butanethiol from kerosene and diesel oils in a temperature range from 25 to 45°C.…”

Section: Batch Experimentsmentioning

confidence: 90%

Process design for gas condensate desulfurization and synthesis of nano-13X zeolite adsorbent: equilibrium and dynamic studies

Bakhtiari

Ghassabzadeh²,

Royaee³

et al. 2018

Pet. Sci.

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This paper summarizes the results of a study of adsorption of sulfur compounds from a high-sulfur feed on improved spherical-shaped nano-AgX zeolite. For this purpose, the nano-AgX zeolite was initially synthesized and improved with silver compounds such as silver nitrate, and then it was utilized in the adsorption process. In order to investigate the equilibrium and dynamics of the adsorption process, adsorptive desulfurization of real feed (i.e., sour gas condensate from the South Pars gas field) was carried out in batch and continuous processes under several operating conditions; a temperature-dependent Langmuir isotherm model was used to fit the equilibrium data. The value of monolayer adsorption capacity (q m) and adsorption enthalpy DH ð Þ were calculated to be 1.044 mmol/g and 16.8 kJ/mol, respectively. Furthermore, a detailed theoretical model was employed in order to model the breakthrough experiments. The results revealed that an increase in the feed flow rate and 1=T values will cause linear and exponential increase in the total mass transfer coefficient (k s). Isotherm and dynamic breakthrough models were found to be in agreement with the experimental data.

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“…This showed that the incorporation of Ag into the zeolite pores and on its surface slightly affected the crystallinity of the zeolite structure [47]. At the peak at approximately 27°, the relative intensity increased with the increase in the amount of silver loading in the zeolite, whereas the relative intensity of the peak at 26° decreased with increasing silver loading in the zeolite.…”

Section: Accepted Manuscriptmentioning

confidence: 95%

“…When the Ag + was exchanged with Na + in the exchanged zeolite sites, the electrical field of the zeolite crystal was changed, followed by changes in the peak intensities of the zeolites [49]. According to Song et al [47], the decreases in the peak intensities (peaks at 2θ 10-12°) after ion exchange with Ag + reflects the loss of crystallinity which occurs due to the dealumination of the NaY zeolite followed by a minor lattice collapse in the zeolite. As the characteristic peak of the NaY zeolite was retained and no new peaks were observed after modification with silver, it was suggested that the modification of the zeolite with silver did not cause any changes in the zeolite structure.…”

Section: Accepted Manuscriptmentioning

confidence: 99%