Fast synthesis of SSZ-13 zeolite by steam-assisted crystallization method

Zeng, Lianggang; Yu, Zhichao; Sun, Zhongtian; Han, Yide; Xu, Yan; Wu, Junbiao; Liang, Zhiqiang; Wang, Zhuopeng

doi:10.1016/j.micromeso.2019.109789

Cited by 18 publications

(11 citation statements)

References 27 publications

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“…Likewise, the total selectivity towards ethane and propane is higher for the nanosized SSZ-13. This example clearly shows that zeolite downsizing notably contributes to overcoming the diffusion limitations in catalytic processes [223].…”

Section: Chamentioning

confidence: 82%

Analysis and control of acid sites in zeolites

Palčić

Valtchev

2020

Applied Catalysis A: General

102

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The exceptional catalytic performance of zeolites is due to the presence of active sites in a shape-selective environment, i.e., in micropores with molecular dimensions. The present review provides a comprehensive analysis of active sites in zeolite frameworks. It is focused on the active sites generated by the Al incorporation in the framework. The inclusion of other heteroatoms in the zeolite framework is also addressed. After the introduction of zeolite-type materials and a discussion of the structure-properties relationship in zeolites the central part of the review is devoted to i) the analytical methods and their complementarity for the evaluation of the number, strength, and position of active sites and ii) the in situ and post-synthesis methods of acid sites assessment and control. The data presented herein provide guidelines for making zeolite materials by design in terms of acidity.

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Section: Chamentioning

confidence: 82%

Analysis and control of acid sites in zeolites

Palčić

Valtchev

2020

Applied Catalysis A: General

102

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“…As expected, the parent SSZ-13 chabazite structure was maintained, consistent with previous reports. 21,61 No discrete Ni-containing phases (e.g., Ni, NiO, Ni(OH) 2 ) were observed. Moreover, throughout all NO 2 exposures studied, no change in XRD (Figure S5) patterns was observed for Ni-SSZ-13 or H-SSZ-13.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Percival

Henkelis

et al. 2021

Ind. Eng. Chem. Res.

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A novel sensor composed of a nickel-loaded SSZ-13 zeolite membrane on interdigitated electrodes (IDEs) is demonstrated as a direct electrical NO2 readout sensor. This NO2 adsorbent is made by homogeneously loading SSZ-13 zeolite with nickel(II) through a liquid-phase ion-exchange procedure. Exposure of the zeolite-based sensor to trace NO2 gas elicits an electrical impedance response measured at a single frequency. The sensor shows the same final change in impedance magnitude upon equilibration to different concentrations of trace NO2 in N2, suggesting that the occupation and eventual saturation of adsorption sites lead to the impedance change. However, the NO2 concentration can be determined through analysis of the rate of impedance change, where lower concentrations of NO2 lead to larger time constants with a logarithmic relationship to the NO2 concentration. Two time constants were observed from the linearized impedance plots, a fast one (τ1) and a slow one (τ2), where τ2 showed a larger dependence on the NO2 concentration, increasing faster than τ1 as the NO2 concentration decreased. Furthermore, the Ni-SSZ-13 sensor response is partially reversible in an inert gas environment, indicating the reversible adsorption of NO2 at nickel surface sites. Under exposure to humid air, differentiation between humid air and dry 5 ppm NO2 is accomplished by examination of the real component of the impedance signal. The resulting NO2 atmosphere shows an increase in the real component (more resistive), whereas the humid air shows a decrease (more capacitive). These results indicate that control of metal-ion loading into SSZ-13 may allow these NO2 selective catalytic reduction catalysts to be further leveraged as low-temperature NO2 sensors.

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“…Membrane thickness decreased from 3.0 to 1.2 μm when the H 2 O/SiO 2 ratio in the solution increased from 44 to 132, as shown in Figures 4 and 6. Different from the dry/thick gels (H 2 O/SiO 2 ratio less than 10) using the SAC method for zeolite powder synthesis, 47 all the solution we used for membrane growth were diluted ones with the H 2 O/SiO 2 ratio of 44:132. The sucked amount of precursor/nutrition was less when the gel dilution was higher.…”

Section: Resultsmentioning

confidence: 99%

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

Liu

et al. 2020

Energy Fuels

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Thin and high-quality SSZ-13 membranes were synthesized by the steam-assisted conversion (SAC) method for the first time. More than 95% gel/solution was saved for membrane growth compared with conventional hydrothermal synthesis. Another advantage for the SAC method was that the competitive crystallization between the bulk solution and support was eliminated. The thickness of SSZ-13 membranes was well controlled from 1.2 to 3.0 μm by the dilution of sucked solution and synthesis time. Three membranes prepared under optimized conditions displayed N 2 permeances of (1.4 ± 0.12) × 10 −7 mol m −2 s −1 Pa −1 (∼418 GPU), N 2 /CH 4 selectivities of 14.8 ± 0.45 and a separation index of 0.19 ± 0.02 mol m −2 s −1 at 298 K, and 0.2 MPa pressure drop for an equimolar N 2 /CH 4 mixture. The membranes synthesis by the SAC method had a good reproducibility. Such separation performances of current SSZ-13 membranes were beyond the upper bound for N 2 /CH 4 separation among the reported membranes. The influences of temperature, pressure drop, and feed flow rate on separation performance of the membranes were investigated. High-pressure N 2 /CH 4 separation was also reported using SSZ-13 membranes at the pressure drop up to 2.5 MPa.

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Fast synthesis of SSZ-13 zeolite by steam-assisted crystallization method

Cited by 18 publications

References 27 publications

Analysis and control of acid sites in zeolites

Analysis and control of acid sites in zeolites

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

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Fast synthesis of SSZ-13 zeolite by steam-assisted crystallization method

Cited by 18 publications

References 27 publications

Analysis and control of acid sites in zeolites

Analysis and control of acid sites in zeolites

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO2

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N2/CH4 Separation

Contact Info

Product

Resources

About

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation