Manipulation of the pore size of clinoptilolite for separation of ethane from ethylene

Farjoo, Afrooz; Sawada, James A.; Kuznicki, Steven M.

doi:10.1016/j.ces.2015.08.044

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The adsorption of hydrogen on clinoptilolite could not be measured at this temperature range. The stronger adsorption of C 2 H 4 on the zeolite is attributed to the strong quadrupole moment that results in specific interactions between the ethylene π-bonds and the cationic sites in the zeolite micropores [ 21 , 22 ]. The isotherms of methane and ethane are linear at temperatures higher than 25 °C, while for ethylene, the isotherm has a rectangular pattern due to the strong adsorption of this gas onto the zeolite pores.…”

Section: Resultsmentioning

confidence: 99%

“…Before conducting the permeation tests, the integrity and robustness of the synthesized membranes must be confirmed. Our earlier investigations have indicated the synthesis of defect-free mixed matrix membranes after coating with zeolite slurry [ 20 , 22 ]. After the formation of a zeolite layer, permeation tests were also conducted using gases of different molecular sizes, such as H 2 , CO 2 , and C 2 H 6 to ensure the absence of large defects in the membrane.…”

Section: Resultsmentioning

confidence: 99%

“…In single gas tests, the permeance of all gases, particularly H 2 , was enhanced upon increasing the operating temperature. As the contribution of Knudsen and viscous transports to permeance decreases with temperature, the increasing permeation trend of all of the gases as the temperature increases shows the larger contribution of zeolitic transport [ 14 , 20 , 22 , 31 ]. In both pure and mixed gas tests, the permeance of H 2 was more noticeably affected than that of the other gases.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen Separation by Natural Zeolite Composite Membranes: Single and Multicomponent Gas Transport

2017

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Single and multicomponent gas permeation tests were used to evaluate the performance of metal-supported clinoptilolite membranes. The efficiency of hydrogen separation from lower hydrocarbons (methane, ethane, and ethylene) was studied within the temperature and pressure ranges of 25–600 °C and 110–160 kPa, respectively. The hydrogen separation factor was found to reduce noticeably in the gas mixture compared with single gas experiments at 25 °C. The difference between the single and multicomponent gas results decreased as the temperature increased to higher than 300 °C, which is when the competitive adsorption–diffusion mechanism was replaced by Knudsen diffusion or activated diffusion mechanisms. To evaluate the effect of gas adsorption, the zeolite surface isotherms of each gas in the mixture were obtained from 25 °C to 600 °C. The results indicated negligible adsorption of individual gases at temperatures higher than 300 °C. Increasing the feed pressure resulted in a higher separation efficiency for the individual gases compared with the multicomponent mixture, due to the governing effect of the adsorptive mechanism. This study provides valuable insight into the application of natural zeolites for the separation of hydrogen from a mixture of hydrocarbons.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Hydrogen Separation by Natural Zeolite Composite Membranes: Single and Multicomponent Gas Transport

2017

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“…The Bayah natural zeolites were dominated as clinoptilolite types. Despite the pore size of clinoptilolite being relatively small, excluding molecules larger than 0.4 nm [31], the catalyst showed high activity for pyrolysis plastic. The mesoporous features created after acid-treated in the natural zeolite pore provide access to acid sites for reactants.…”

Section: Effect Of Temperature Polyole N Types and Natural Zeolites O...mentioning

confidence: 99%

Pyrolysis of Polyolefins into Chemicals Using Low-Cost Natural Zeolites

Irawan

Kurniawan²,

Nurkholifah³

et al. 2022

Waste Biomass Valor

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Massive production of disposable plastic that is not supported with proper plastic waste management has created an environmental problem. One solution that could be done to address this situation is by transforming plastics into chemicals through pyrolysis route. An experimental study of pyrolysis from polyethylene (PE) and polypropylene (PP) has been done by catalytic method and utilization of low-cost natural zeolite in a semi-batch reactor. A low-cost natural zeolite made from acid-treated zeolite with 1 M HCl solution denoted as HZ. The prepared HZ catalyst was then carried out under pyrolysis reaction at 350, 400, 450 o C for 60 minutes. The chemical products composition from this reaction was analyzed using Gas Chromatography-Mass Spectrometry (GC-MS). According to the analysis result, a low-temperature reaction of pyrolysis could produce wax in all variant types of feed. Utilization of HZ catalyst could reduce formation wax while also increasing the yield of oil products after the reaction. Catalytic pyrolysis using HZ for PE and PP plastic feed yields oil products up to 67% and 70%, respectively. The composition of oil products mainly consisted of para n, ole n, and alcohol compounds. The temperature optimum for the catalytic reaction could produce the highest para n and ole n products at 400°C. Additionally, utilization of low-cost natural zeolite could improve pyrolysis reaction's performance from PP to produce yield ole n products from 39-62%. Statement Of NoveltyPlastics waste is threatening the environment due to its di culty in degradation. Pyrolysis of plastic by using catalysts would improve the oil products. Natural zeolites are low-cost minerals and are abundantly available throughout the world. The novelty of this study is to investigate the local natural zeolites in Indonesia as a cost-effective catalyst for application in polyole ns pyrolysis. The oil yield and products selectivity improved signi cantly after using the natural zeolites. The oil composition identi ed would be potentially utilized as chemicals and fuels. Finally, the catalytic pyrolysis of plastic waste using low-cost local catalysts will overcome the environmental problem and create the circular economy of plastic.

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“…10 The effective pore size of the zeolite excludes molecules larger than about 0.4 nm. 11 This value may vary to some extent when an ion-exchange procedure is applied.…”

Section: Introductionmentioning

confidence: 99%

Gas permeability of polydimethylsiloxane membranes filled with clinoptilolite in different cationic forms

Atalay-Oral¹

2018

Turk J Chem

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Zeolite-polymer mixed matrix membranes were prepared by filling polydimethylsiloxane (PDMS) with clinoptilolite in various cationic forms of K, Mg, H, and Na. The membranes were characterized by scanning electron microscopy as well as measurements of O 2 , N 2 , and CO 2 gas permeabilities. The results indicated the presence of an optimum zeolite loading in the mixed matrix membranes maximizing permeability. The type of the cationic form of clinoptilolite used affected the permeabilities and ideal selectivities of the zeolite-polymer mixed matrix membranes investigated to some degree and some improvements were obtained when compared to the ideal selectivities of the original polymeric membranes.

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Manipulation of the pore size of clinoptilolite for separation of ethane from ethylene

Cited by 6 publications

References 10 publications

Hydrogen Separation by Natural Zeolite Composite Membranes: Single and Multicomponent Gas Transport

Hydrogen Separation by Natural Zeolite Composite Membranes: Single and Multicomponent Gas Transport

Pyrolysis of Polyolefins into Chemicals Using Low-Cost Natural Zeolites

Gas permeability of polydimethylsiloxane membranes filled with clinoptilolite in different cationic forms

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