Preparation of hierarchical TS-1 zeolite membrane via a dissolution–recrystallization process

Liu, Xuguang; Xie, Bin; Zhang, Baoquan; Ma, Laibo

doi:10.1007/s10853-017-1641-1

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…The membrane pore size distribution was directly revealed by a permporometry measurement. 47 2.4. N 2 /CO 2 Separation Experiment.…”

Section: Methodsmentioning

confidence: 68%

“…The total time of the crystallization periods was 144 h. This preparation method here is suggested as a periodical secondary growth. These obtained membranes were washed with DI water, dried at 333 K, and activated through a catalytic hydrocracking approach at 613 K with Pd/SiO 2 as the catalyst, which is described in detail in our previous work for mild removal of templates. − This mild activation temperature (613 K) would avoid structure damage and maintains the local structure. The procedure of seeded growth with the TS-1 particle is similar to refs and .…”

Section: Methodsmentioning

confidence: 99%

“…The activated membranes would be regarded as free of the defects, if its f was hardly independent of P av . The membrane pore size distribution was directly revealed by a permporometry measurement …”

Section: Methodsmentioning

confidence: 99%

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Highly Oriented Thin Membrane Fabrication with Hierarchically Porous Zeolite Seed

Liu

Zhang

et al. 2018

Crystal Growth & Design

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Nanosized zeolite is widely used as seed for high quality zeolite membranes fabrication, while its complicated synthesis routine limits large-scale productions. In this work, a non-nanosized cubic hierarchically porous TS-1 zeolite (HTS-1), obtained by basic hydrothermal treatment of conventional ellipsoid solid TS-1, is used as seed to prepare highly oriented thin membranes. A capillary condensation phenomenon resulting from the unique hierarchically porous structure benefits gel attachment. Moreover, abundant ledges, kinks, and terraces on the HTS-1 surface promote epitaxial growth of the membrane. In contrast, the solid TS-1 seed induces intergrowth dominantly, which results in a thick TS-1 membrane. The HTS-1 membrane demonstrates superior CO2/N2 separation properties compared to the TS-1 one. It associates with thin oriented membrane morphology, leading to exposure of a high Miller index surface and less diffuse distance and tortuosity. The results suggest beneficial effects of a hierarchically porous TS-1 zeolite seed on the interfacial crystal growth for membrane fabrication. A similar conclusion is applicable to the case of a hierarchically porous zeolite β. This work develops a facile approach to obtain a highly oriented thin zeolite membrane with enhanced separation properties.

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“…The membrane pore size distribution was directly revealed by a permporometry measurement. 47 2.4. N 2 /CO 2 Separation Experiment.…”

Section: Methodsmentioning

confidence: 68%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Oriented Thin Membrane Fabrication with Hierarchically Porous Zeolite Seed

Liu

Zhang

et al. 2018

Crystal Growth & Design

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“…Lu et al , and Wang et al observed that the formation of intracrystal mesopores in coatings via desilication facilitated the diffusion and thus the catalytic cracking stability. Liu et al adopted dissolution–recrystallization to prepare hierarchical TS-1 coatings, and superior gas/water permeability was observed . However, these methods faced a problem regarding poor control of mesoporosity and undesirable loss of active sites.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al adopted dissolution−recrystallization to prepare hierarchical TS-1 coatings, and superior gas/water permeability was observed. 16 However, these methods faced a problem regarding poor control of mesoporosity and undesirable loss of active sites. Alternatively, amphiphilic organosilane was employed for fabricating meso-HZSM-5 membranes with ordered intracrystal mesopores.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Cracking of Endothermic Fuels over Meso-HZSM-5/MCM-41 Coatings

et al. 2019

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Novel structured catalysts of meso-HZSM-5/MCM-41 composite coatings were synthesized via a two-step process: washcoating HZSM-5 powder on the internal surface of a stainless steel tube and subsequently converting SiO2 binder into MCM-41 by sequential desilication and recrystallization. Additional Fe and Al species were incorporated into the MCM-41 framework for increasing the active sites. It was found that the adherence strength of composite coating was remarkably improved, as a result of encapsulation of HZSM-5 crystals into the successive MCM-41 network. Catalytic cracking of supercritical n-dodecane (500 °C and 4 MPa) was employed to test the catalytic performance of the coatings. The ZC-Al/Fe coating with both Fe and Al species incorporated into the MCM-41 framework showed an excellent catalytic performance, with the initial conversion of n-dodecane enhancement by 50.6%, the deactivation rate reduction by 64.5%, and the heat sink improvement by 14.5%, compared to the parent HZSM-5 coating. The performance enhancement for ZC-Al/Fe coating may result from the sequential precracking–cracking–dehydrogenation reaction process catalyzed by acid sites in MCM-41, acid sites in meso-HZSM-5, and redox sites in MCM-41, respectively.

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One‐Pot Synthesis and Formation Mechanism of Hollow ZSM‐5

Zhang

Che

2019

Chemistry A European J

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Coffin-shapedh ollow ZSM-5 zeolite (HZZ) particles with shell thickness of about 200 nm andh ollow diameter of approximately 1.5 mmw ere synthesized in one pot by using tetrapropylammonium bromide (TPABr),a luminumt riisopropoxide Al[OCH(CH 3 ) 2 ] 3 and tetraethoxysilane (TEOS) as the structure-directinga gent (SDA),a luminum ands ilica source,r espectively.T he appropriate molar ratios of TPABr/ SiO 2 and Si/Al as well as suitablec rystallization temperature are the key factors for the formation of HZZ. The formation of the HZZ can be attributed to the existence of intrinsic density variation inside the initial amorphous aggregates and the Al zoning in the outer surfaceo ft he ZSM-5 particles. Amorphous silica with lowc rystallinity formed at early stagesa nd low Al concentration,w hich has been subsequently dissolved and recrystallizedo nt he ZSM-5 particle surface through Ostwaldr ipening, leading to the formation of HZZ. This approach, which uses ah igh concentration of SDA, will providen ew possibilities and insighti nto the prospectivefabrication of hollow zeolites.[**] ZSM-5 = Zeolite SoconyMobil-5.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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Preparation of hierarchical TS-1 zeolite membrane via a dissolution–recrystallization process

Cited by 12 publications

References 48 publications

Highly Oriented Thin Membrane Fabrication with Hierarchically Porous Zeolite Seed

Highly Oriented Thin Membrane Fabrication with Hierarchically Porous Zeolite Seed

Catalytic Cracking of Endothermic Fuels over Meso-HZSM-5/MCM-41 Coatings

One‐Pot Synthesis and Formation Mechanism of Hollow ZSM‐5

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