Microstructures formed by secondary growth of fired ZSM-5 seed crystals

Uemiya, Shigeyuki; Tanigawa, Atsushi; Koike, Tatsuya; Sasaki, Yukichi; Ban, Takayuki; Ohya, Yutaka; Yoshiie, Ryo; Nishimura, Makoto; Yamamoto, Naoki; Yogo, Katsunori; Yamada, Kôichi

doi:10.1007/s10934-007-9096-4

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…With the submicrometer zeolite Y seed crystals, (Figure ), dissolution does still occur, but probably not as rapidly and to full completion as is the case for higher surface/volume ratio nanocrystals. Such dissolution phenomena has been also been observed for zeolite A, TS-1, MFI, and ZSM-5. − For both nano and submicrometer seeds used in synthesis of composition B membranes, dissolution of the seed crystals occurs in the initial stage. In the case of the submicrometer seed layer, partial dissolution is followed by secondary growth of the remaining zeolite Y nuclei at the alumina interface.…”

Section: Discussionmentioning

confidence: 71%

“…Such dissolution phenomena has been also been observed for zeolite A, TS-1, MFI, and ZSM-5. [28][29][30][31] For both nano and submicrometer seeds used in synthesis of composition B membranes, dissolution of the seed crystals occurs in the initial stage. In the case of the submicrometer seed layer, partial dissolution is followed by secondary growth of the remaining zeolite Y nuclei at the alumina interface.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

et al. 2010

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Synthesis of zeolite Y membranes from submicrometer (>100 nm) and nano seed (<100 nm) crystals on alumina supports was examined and the separation characteristics of these membranes for CO(2) and N(2) were studied. Two secondary growth solutions were examined, one for a rapid growth (hours) and one for a slower growth process (days). Membranes formed from the rapid growth solution resulted in 2-2.5 microm thickness, while for the slower growth solution, a dense membrane of 350-600 nm thickness was formed, covered by a 25 microm porous zeolite layer. With the nano seeds as the seeding layer, no membrane was formed. A mechanism involving seed dissolution to initiate membrane formation is concluded. The separation characteristics of membranes for CO(2)/N(2) separation were similar, with very high selectivities for separation (alpha(CO(2),N(2)) > 500). The thicker membrane had lower permeance. By investigating both single gas and mixed gas permeances, strong evidence for a percolative type separation process is obtained.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

et al. 2010

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“…In fact, core-shell catalyst with different crystal between core and shell is often prepared by not in situ growth method but the secondary growth method. Before shell disposition, core particle will be modified for shell adsorption on core surface [22][23][24][25][26][27][28] . But here we got no modification and the shell disposition was forced directly on the core surface in a small space of water droplet, the core particle acting as seed, as is in situ growth method in water in oil microemulsion.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Core-Shell Catalyst by in situ Growth Method in Water-in-Oil Microemulsion

Chen¹,

Cao²,

Wang³

et al. 2014

Asian J. Chem.

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A type of core-shell catalyst CuO-ZnO-Al2O3/ZSM-5 was prepared for direct synthesis of dimethyl ether from syngas. A water-in-oil microemulsion made up of liquid paraffin, Span 80 and water phase was used to prepare both the core and core-shell catalyst. The water phase was consisted of core growth medium for core preparation or core sol for core-shell preparation. The dispersion medium of core sol was the growth medium and shell would layer on the core directly. Transmission electron microscopic images showed the core particles were in nano-size and coated by shell successfully. EDS was used to test quality percents of Cu, Zn and Al. The crystal structure of core and shell was described by XRD. This original preparation method of in situ growth in microemulsion can give a novel inspiration to the core-shell constitute material which can realize the combination of two and more sequential reactions with many synergistic effects.

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Preparation of ZSM‐5 Coated on Monolithic Interconnected Macroporous Al₂O₃ Using Cheap n‐Butylamine as Template

et al. 2015

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Using cheap n‐butylamine as template, ZSM‐5 zeolites have been successfully synthesized and coated on monolithic interconnected macroporous Al2O3 by the secondary growth method. The use of cheap n‐butylamine could significantly reduce the synthesis cost. Hierarchical monolithic ZSM‐5 zeolites were prepared from synthetic mixtures with different H2O/Na2O or SiO2/Al2O3 ratio. The synthesized samples were characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR) and N2 adsorption‐desorption. The results show that the hierarchical monolithic zeolites were obtained with cheap n‐butylamine template as template. During the hydrothermal reaction process, the morphology of the micrometer‐sized support was well maintained. The irregular crystals were formed in a wide range of the H2O/Na2O or SiO2/Al2O3 ratio of synthetic mixtures and coated on monolithic Al2O3. The relative crystallinity of the zeolites was highest at H2O/Na2O=250 or SiO2/Al2O3=160. This type of composites exhibited hierarchical porous structures and relatively high specific surface areas.

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Microstructures formed by secondary growth of fired ZSM-5 seed crystals

Cited by 4 publications

References 8 publications

Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

Preparation of Core-Shell Catalyst by in situ Growth Method in Water-in-Oil Microemulsion

Preparation of ZSM‐5 Coated on Monolithic Interconnected Macroporous Al₂O₃ Using Cheap n‐Butylamine as Template

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Microstructures formed by secondary growth of fired ZSM-5 seed crystals

Cited by 4 publications

References 8 publications

Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

Synthesis of Ultrathin Zeolite Y Membranes and their Application for Separation of Carbon Dioxide and Nitrogen Gases

Preparation of Core-Shell Catalyst by in situ Growth Method in Water-in-Oil Microemulsion

Preparation of ZSM‐5 Coated on Monolithic Interconnected Macroporous Al2O3 Using Cheap n‐Butylamine as Template

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Preparation of ZSM‐5 Coated on Monolithic Interconnected Macroporous Al₂O₃ Using Cheap n‐Butylamine as Template