Modification of commercial NaY zeolite to give high water diffusivity and adsorb a large amount of water

Katoh, Masahiro; Kimura, Michisato; Sugino, Mao; Horikawa, Toshihide; Nakagawa, Keizo; Sugiyama, Shigeru

doi:10.1016/j.jcis.2015.05.050

Cited by 8 publications

(15 citation statements)

References 18 publications

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“…The adsorbed amount of water increased rapidly at 10% relative humidity and the adsorbed amount of water corresponded to the amount that would saturate a Y type zeolite. The results of alkali treatment for both NaY zeolites [4] and ZSM-5 type zeolites [5] were reported previously. Water diffusivity was enhanced for NaY zeolites via alkali treatment with 1 M of a NaOH solution.…”

Section: Introductionsupporting

confidence: 68%

“…The infrared (IR) spectra of the water-alkali treated SAPO-34 adsorption systems were obtained using the IR cell reports from other papers [4]- [10]. A sample disc that was 13 mm in diameter, approximately 8.5 mg in weight, and approximately 60 µm in thickness was pretreated in the cell at 350˚C and 4.0 × 10 −4…”

Section: Measurement Of the Thermal Behavior Of Water Adsorbed Onto Smentioning

confidence: 99%

“…Water adsorption was measured using a volumetric adsorption apparatus assembled in our laboratory [4] [5] [7]. The adsorbent was initially outgassed in a sample room at 350˚C and 4.0 × 10 −4 Torr for 2 h. Water was introduced to the sample room at a saturated water pressure and at room temperature.…”

Section: Measurement Of the Water Adsorption And Desorption Behavior mentioning

confidence: 99%

“…In the present study, SAPO-34 was treated with either NaOH (0.2, 0.01, 0.005, or 0.001 M) [4] [5] or NH 4 OH (0.005 M) with the goal of achieving a higher rate of water diffusivity. The modified SAPO-34 was characterized by XRD, SEM, XRF, IR, and nitrogen adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…The IR spectra of water adsorbed onto zeolites were measured under differential temperatures at a constant pressure. The water adsorption behavior was estimated by measuring the change of pressure under a constant volume [4] [5] [7].…”

Section: Introductionmentioning

confidence: 99%

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Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties

Katoh¹,

Horiuchi²,

Satoh³

et al. 2019

JEAS

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Commercial silicoaluminophosphate molecular sieves (SAPO-34) received alkali treatment with either NaOH (0.2, 0.01, 0.005, or 0.001 M) or NH 4 OH (0.005 M). Treatment with NaOH (0.005 M) increased the water adsorption initial rate of SAPO-34 by 1.4-fold. The alkali treatment introduced Na + adsorption sites into the SAPO-34. The desorption ratio (adsorption at 30˚C and desorption at 100˚C) was 88.2% higher than the original rate (84.3%). On the other hand, after alkali treatment of SAPO-34 using NH 4 OH (0.005 M), calcination resulted in the highest desorption ratio at 91.3%. When combined with calcination, alkali treatment with NH 4 OH introduced H + adsorption sites into SAPO-34, H + adsorption sites feature low levels of interaction with water, which enhanced the desorption ratio, but decreased the initial adsorption rate. These results indicate that treating commercial SAPO-34 with 0.005 M NaOH enhances both the adsorption and desorption behaviors.

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Section: Introductionsupporting

confidence: 68%

Section: Measurement Of the Thermal Behavior Of Water Adsorbed Onto Smentioning

confidence: 99%

Section: Measurement Of the Water Adsorption And Desorption Behavior mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties

Katoh¹,

Horiuchi²,

Satoh³

et al. 2019

JEAS

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Adsorption Equilibrium and Kinetics of Methanol Vapor on Zeolites NaX, KA, and CaA and Activated Alumina

Xiao

Yuan

2018

Ind. Eng. Chem. Res.

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Methanol vapor as a contaminant presented in industrial streams leads to catalysts deactivation. Therefore, it needs deep removal with adsorption technique. The isotherms and effective diffusion coefficients of methanol vapor are essential to design the purification process. The equilibrium sorption of methanol steam on commercial zeolites NaX, KA, and CaA and activated alumina were tested using an intelligent gravimetric analyzer, respectively. The equilibrium experiments were carried out at 303.2 K and pressures of up to 19.6 kPa, and the results obtained were fitted with the Dubinin–Astakhov (D-A) model. Moreover, the diffusion of methanol vapor in the adsorbents was investigated, and the effective diffusion coefficients were obtained with fitting the Fick diffusion model. The adsorbents are compared on the basis of adsorption capacities for methanol steam, and the descending order of zeolites is NaX > CaA > KA > Al2O3. The sorption equilibrium experimental results of methanol steam on NaX, KA, and CaA agree well with D-A isotherm model, while it is not very well consistent on Al2O3. The equilibrium adsorption capacities of methanol vapor are consistent with the effective diffusion coefficients on the adsorbents.

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Effects of different silica intermediate layers for hydrogen diffusion enhancement of palladium membranes applied to porous stainless steel support

Katoh

Ueshima

Takatani

et al. 2020

Sci Rep

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Porous stainless steel (SUS) supports were modified with double intermediate layers, silicalite-1 and γ-alumina, to enhance the hydrogen diffusion of a thin palladium membrane. One of layers, silicalite-1, was prepared using the hydrothermal synthetic method on porous SUS supports. The differences in expansion/contraction behaviors caused by different thermal coefficients of expansion between silicalite-1 and the SUS resulted in a lowering of the durability of the membrane. Intermediates layers of mesoporous MCM-48 powders or commercial spherical non-porous silica particles were then applied to porous SUS supports via aspiration, γ-alumina was introduced by dip-coating, and the Pd membrane was subjected to electro-less plating. H 2 permeance of the Pd membrane (membrane thickness: 11 μm) containing spherical silica particles was around 10 × 10 −6 mol•m −2 •s −1 •Pa −1 at 600 °C, which was higher than that of the Pd membrane (membrane thickness: 7 μm) containing MCM-48. The durability of the Pd membrane containing spherical silica particles was higher than that of the version containing MCM-48 powders. These results suggest that commercial spherical non-porous silica particles will uniformly occupy the pores of the SUS tubes and enhance the H 2 permeance and durability of the Pd membrane.

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Modification of commercial NaY zeolite to give high water diffusivity and adsorb a large amount of water

Cited by 8 publications

References 18 publications

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties

Adsorption Equilibrium and Kinetics of Methanol Vapor on Zeolites NaX, KA, and CaA and Activated Alumina

Effects of different silica intermediate layers for hydrogen diffusion enhancement of palladium membranes applied to porous stainless steel support

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Modification of commercial NaY zeolite to give high water diffusivity and adsorb a large amount of water

Cited by 8 publications

References 18 publications

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO&lt;sub&gt;-&lt;/sub&gt;34) Enhances the Water Adsorption and Desorption Properties

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO&lt;sub&gt;-&lt;/sub&gt;34) Enhances the Water Adsorption and Desorption Properties

Adsorption Equilibrium and Kinetics of Methanol Vapor on Zeolites NaX, KA, and CaA and Activated Alumina

Effects of different silica intermediate layers for hydrogen diffusion enhancement of palladium membranes applied to porous stainless steel support

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Product

Resources

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Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties

Alkali Treatment of Commercial Silicoaluminophosphate Molecular Sieves (SAPO<sub>-</sub>34) Enhances the Water Adsorption and Desorption Properties