Sulfuric acid dissolution of 4A and Na-Y synthetic zeolites and effects on Na-Y surface and particle properties

Wang, Xiaoyu; Wang, Kunping; Plackowski, Chris; Nguyen, Anh V.

doi:10.1016/j.apsusc.2016.01.103

Cited by 24 publications

(20 citation statements)

References 23 publications

(21 reference statements)

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“…XRD analysis showed the crystal structure collapsed after acid modification [34]. Comparing the untreated Na─Y to that exposed to water only, the crystal phases did not change after contacting Milli-Q water.…”

Section: Impact Of H 2 So 4 Concentration On Solid Mass In Na─y Zeolimentioning

confidence: 94%

“…Potential Desalination of Coal Seam Gas Coproduced Water Using Zeolite http://dx.doi.org/10.5772/intechopen.73613 Table 2. Behavior of the Na─Y suspensions after 3-day standing [34]. All of the tetrahedra are interconnected with shared corners to form channels of molecular dimensions.…”

Section: Characterization Of Electrokinetic Properties Of Clinoptilolmentioning

confidence: 99%

“…The results of XPS survey scans showed two different significant changes in atomic proportions of the Na─Y zeolite elements [34]: Na and Al decreased from 7.98% to 0 as the acid concentration increases from 0 to 0.5 M, but O and Si increased until the acid concentration reaches 0.5 M as well and then remained almost constant to 5 M. Sulfuric acid modifications on Na─Y zeolite could totally remove Na and Al from the surface, such that the main structural elements remaining were only Si and O. Together with the XRD results, the XPS data confirmed that Na and Al have been removed not only on the particle surface but also from the internal structure.…”

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

“…The change in O1s BE energy is explained by the interactions between the two known O bonds in the structure of Na─Y [35] (i.e., bridging oxygen Figure 13. XPS high-resolution spectra of original and sulfuric acid-treated Na─Y for Si 2p , O 1s , and Al 2p [34].…”

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

“…incorporated in structures such as Si─O─Si and non-bridging oxygen (NBO) comprising structures such as Si─O─M (where M represents other elements such as Na, Al, etc.) and H from water [34]. There are two possible reasons for the increase in BE of Si (and O): (1) the placement of Na and Al by H and (2) partly or full destruction of the surface structure dissolved in acid solution and recrystallized into amorphous SiO 2 .…”

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

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Potential Desalination of Coal Seam Gas Coproduced Water Using Zeolite

Wang¹,

Nguyen²

2018

Zeolites and Their Applications

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Natural clinoptilolite type zeolite was examined for its potential to treat coal seam gas (CSG) water and remove sodium ions to lower sodium adsorption ratio and reduce pH. The effectiveness of unmodified and modified natural zeolite is due to their regular composition and open porous structure, high exchange capacity, mechanical strength and stability, and consistency in particle size. The effects of acid modification in bringing about changes to the physicochemical properties of clinoptilolite underpin the effectiveness of this material for treatment of CSG saline water. The sodium adsorption capacity of acid-modified zeolite increases up to three times greater than that of the unmodified zeolite. The atomic percentage and binding energies of the chemical elements comprising zeolite are changed significantly following the acid modification. The Si/Al atomic ratio increases with increasing sulfuric acid concentration. Dealumination is the main reason for the increase in the surface charge and cation exchange capacity of clinoptilolite after acid modification. It is due to the increased defects in the crystal structure/lattice, which result in increasing numbers of charge vacancies. Sodium-rich synthetic zeolites 4A and Na─Y after acid modification are also examined by following the dissolution of the first-order fast kinetics and recrystallization processes which can be homogeneous or heterogeneous.

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Section: Impact Of H 2 So 4 Concentration On Solid Mass In Na─y Zeolimentioning

confidence: 94%

Section: Characterization Of Electrokinetic Properties Of Clinoptilolmentioning

confidence: 99%

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

Section: Xps Analysis Of the Effect Of Acid Treatment On Na─y Zeolitementioning

confidence: 99%

See 3 more Smart Citations

Potential Desalination of Coal Seam Gas Coproduced Water Using Zeolite

Wang¹,

Nguyen²

2018

Zeolites and Their Applications

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Catalytic Synthesis of Energy‐rich Fuel Additive Levulinate Esters from Levulinic Acid using Modified Ultra‐stable Zeolite Y

2022

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In the present investigation, the esterification reaction of levulinic acid with ethanol was performed using sulfuric acid‐modified zeolite Y catalyst to synthesize ethyl levulinate. Characterization of zeolite catalysts was performed using SEM‐EDS, XRD, and FTIR techniques. The experiments were performed to find the optimum reaction parameters to obtain the maximum yield of 96 % of the product, levulinate ester by varying catalyst concentration (2–12 wt %), levulinic acid to ethanol mole ratio (1 : 1 to 1 : 13), reaction temperature (40 °C–100 °C). The esterification of levulinic acid with ethanol followed pseudo‐first‐order reaction kinetics. The activation energy for this reaction was found to be 19.570 KJmol−1.

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Preparation of silver supported porous 4A-zeolite through hard template agent combined with heat treatment and study on its catalytic performance

Bai

2018

J Porous Mater

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Sulfuric acid dissolution of 4A and Na-Y synthetic zeolites and effects on Na-Y surface and particle properties

Abstract: acid dissolution of 4A and Na-Y synthetic zeolites and effects on Na-Y surface and particle properties,

Cited by 24 publications

References 23 publications

Potential Desalination of Coal Seam Gas Coproduced Water Using Zeolite

Potential Desalination of Coal Seam Gas Coproduced Water Using Zeolite

Catalytic Synthesis of Energy‐rich Fuel Additive Levulinate Esters from Levulinic Acid using Modified Ultra‐stable Zeolite Y

Preparation of silver supported porous 4A-zeolite through hard template agent combined with heat treatment and study on its catalytic performance

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