Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite

Feng, Ailing; Yu, Yang; Mi, Le; Cao, Yunzhen; Yu, Yun; Song, Lixin

doi:10.1016/j.micromeso.2019.109646

Cited by 37 publications

(12 citation statements)

References 35 publications

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“…The BET specific surface area for USY zeolite is 671.7 m 2 g −1 , consistent with the ultrastable Y-type zeolites in previously reported literatures. 37,38 The high specific surface provides numerous sites that enhance the adsorption of Li + by zeolites. The affinity of USY zeolite to cations was further confirmed by the change of zeta potential.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Regulating Li-Ion Distribution by the Electrical Double Layer Effect for Dendrite-Free and High-Rate Capability Lithium Metal Batteries

Zhang

Yin

et al. 2022

ACS Appl. Energy Mater.

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The formation of lithium dendrites during cycling because of the uneven distribution of Li+ causes shortened lifespan and even safety hazards, which seriously hinder the practical application of lithium metal batteries. Here, a class for commercially available low-cost zeolite as electrolyte additives is proposed. Relying on its huge specific surface area and ion exchange capability, zeolite is a suitable “Li+-carrier” to deliver uniform Li+ distribution for dendrite-free Li deposition. Resultantly, Coulombic efficiency of the Li||Cu cell in an electrolyte with ultrastable Y zeolite addition is more than 98% even at a high current density of 5 mA cm–2. The as-prepared electrolyte prolonged the cycle life to 1100 h for the Li||Li symmetric cell and enabled a high specific capacity of 123.4 mA h g–1 at 3.2 C for the Li||LiFePO4 cell, respectively. This research provides ideas to accelerate the development of high energy density lithium metal batteries.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Regulating Li-Ion Distribution by the Electrical Double Layer Effect for Dendrite-Free and High-Rate Capability Lithium Metal Batteries

Zhang

Yin

et al. 2022

ACS Appl. Energy Mater.

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“…[18] With the increase of NiÀ P content, the areas of hysteresis loops increased slightly, which indicates that the mesoporous volume of modified Y zeolites increased with the increase of NiÀ P content. [19] This is because nickel nitrate solution and ammonium dihydrogen phosphate solution are both acidic, which will cause the dealumination of Y zeolite in the process of modification, thus enlarging the pore size and creating new mesopores, resulting in the increase of irregular mesopores. The analysis results of N 2 adsorption-desorption characterization of NiÀ P co-modified Y zeolites are shown in Table 1.…”

Section: Chemistryselectmentioning

confidence: 99%

Heteroatom‐Modified Zeolite Y and Catalytic Performance of Their NiWS Supported Catalysts for Hydrocracking of Naphthalene

et al. 2022

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In order to prepare hydrocracking catalyst with high catalytic performance for producing chemical raw materials, NiW supported catalysts was prepared with Ni−P co‐modified Y zeolites as the supports for the hydrocracking of naphthalene. Y zeolites were impregnated with different Ni−P contents, and the effects of Ni−P co‐modification on the physicochemical properties of Y zeolites, the properties of the active phases of the catalysts and the catalytic performance of catalysts were analyzed via a series of characterization methods. Ni−P co‐modification could effectively improve the pore properties and acid properties of Y zeolites, and made the acid density and acid strength of Y zeolites meet the requirements of selective cracking of naphthalene. Ni−P co‐modification could also effectively improve the reducibility of active metals,dispersion and stacking number of active phases of the catalysts, which greatly improved the selectivity of the target product (C6−C8) of the catalysts. Compared with NiW/HY, the yield of C6‐C8 products of NiW/2‐Ni/P−Y increased by 30.8 %. It is expected to provide a feasible strategy for the design and preparation of hydrocracking catalysts for the production of chemical raw materials in the integration of refining and chemical industry.

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“…In this context, steamcalcination is a classical method for mesopore formation that involves the removal of Al from the lattice, whereby the zeolite structure is stabilized by the migration of silicon species to increase the SiO 2 /Al 2 O 3 ratio in the zeolite framework. 9 In the case of zeolite Y, its poor stability can be attributed to its low SiO 2 /Al 2 O 3 ratio, and so the steam-calcination treatment of zeolite Y can lead both to an enhanced mesoporous structure and also to an ultrastable state. On the other hand, an increase in the SiO 2 /Al 2 O 3 ratio results in a significantly reduced acid density compared with that of the ordinary HY zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction rate can therefore be inhibited by appropriately reducing the acid content so as to reduce the coking of reactive sites. In this context, steam-calcination is a classical method for mesopore formation that involves the removal of Al from the lattice, whereby the zeolite structure is stabilized by the migration of silicon species to increase the SiO 2 /Al 2 O 3 ratio in the zeolite framework . In the case of zeolite Y, its poor stability can be attributed to its low SiO 2 /Al 2 O 3 ratio, and so the steam-calcination treatment of zeolite Y can lead both to an enhanced mesoporous structure and also to an ultrastable state.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of USY Zeolite with a High Mesoporous Content by Introducing Sn and Enhanced Catalytic Performance

Meng

Ren

Liu

et al. 2020

Ind. Eng. Chem. Res.

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A method for the introduction of trace Sn atoms into zeolite Y to impart a large mesoporous pore volume is proposed, whereby the mesoporous pore volume, framework SiO2/Al2O3 molar ratio, and crystal size were controlled by varying the Sn content. Characterization of the zeolite samples by a range of analytical techniques demonstrated that Sn entered the zeolite framework and produced superior mesopores during subsequent steam treatment, with an increased mesoporous pore volume of up to 50% being achieved compared with that of the ultrastable Y (USY) zeolite. In the catalytic cracking of 1,3,5-triisopropylbenzene, the reactivity of the Sn-containing zeolite Y differed significantly from that of USY. In addition, the Sn-containing zeolite Y exhibited a higher activity and a lower deactivation tendency than USY. Overall, the presented results indicate that this method of introducing mesopores by presetting the unstable sites in the framework of zeolite Y can have a positive influence in the preparation of mesoporous Y zeolites.

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Structural, textural and toluene adsorption properties of NH4HF2 and alkali modified USY zeolite

Cited by 37 publications

References 35 publications

Regulating Li-Ion Distribution by the Electrical Double Layer Effect for Dendrite-Free and High-Rate Capability Lithium Metal Batteries

Regulating Li-Ion Distribution by the Electrical Double Layer Effect for Dendrite-Free and High-Rate Capability Lithium Metal Batteries

Heteroatom‐Modified Zeolite Y and Catalytic Performance of Their NiWS Supported Catalysts for Hydrocracking of Naphthalene

Synthesis of USY Zeolite with a High Mesoporous Content by Introducing Sn and Enhanced Catalytic Performance

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