Phase selection of FAU and LTA zeolites by controlling synthesis parameters

Fan, Wei; Shirato, Satoshi; Gao, Feifei; Ogura, Masaru; Okubo, Tatsuya

doi:10.1016/j.micromeso.2005.11.001

Cited by 63 publications

(38 citation statements)

References 28 publications

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“…• C for LTA ( figure 7(b)) belong to the oxidative decomposition of TMA + in α cage and sodalite cage [4], respectively. For comparison, the DTA and TGA curves of the FAU/LTA composite zeolite and the mechanical mixture are presented together in figures 7(c) and (d), respectively.…”

Section: Characterization Of the Fau Lta And Fau/lta Composite Zeolitementioning

confidence: 99%

“…These two kinds of zeolites can be synthesized from Na 2 O-Al 2 O 3 -SiO 2 -H 2 O systems using tetramethylammonium cation (TMA + ) as structure-directing agent [3][4][5]. Previous study has demonstrated that TMA + , almost the same size with sodalite cage, can induce the formation of some porous structures or secondary building units of the zeolite [6,7], and only one TMA + cation could be located in one sodalite cage [4,8]. Some inorganic ions, such as small alkali metal ions (Na + and Li + ), are hydrated in the synthesis solution.…”

Section: Introductionmentioning

confidence: 99%

“…FAU/LTA was observed by Mintova and Valtchev [10] in their early synthesis of FAU nanozeolite. Utilizing this composite zeolite, Okubo and co-workers [4] roughly studied some synthesis parameters affecting the FAU/LTA yield, and particularly investigated the local environments of TMA + in as-synthesized FAU and LTA zeolites. Navrotsky and co-workers [15] revealed the interplay of kinetic and thermodynamic factors, governing the competition in formation of FAU and LTA, via in situ calorimetry.…”

Section: Introductionmentioning

confidence: 99%

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Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Xie

Wang

et al. 2009

Science and Technology of Advanced Materials

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O] increases from 0.024 to 0.168, the product gradually changes from pure FAU to pure LTA via the formation of FAU/LTA composite with increasing LTA fraction. Interestingly, the induction periods of FAU and LTA in the FAU/LTA composite zeolite ([Na 2 O] is 0.072) are both 13 h, quite different from the induction periods of their individual pure phases-45 h for FAU and 4 h for LTA. During the crystallization, the LTA/(FAU + LTA) fraction in the composite zeolite decreases in a nearly linear fashion. Scanning electron microscopy, thermogravimetry and differential thermal analysis indicate some difference between the properties of the FAU/LTA composite zeolite and of the mechanical mixture.

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Section: Characterization Of the Fau Lta And Fau/lta Composite Zeolitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Xie

Wang

et al. 2009

Science and Technology of Advanced Materials

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“…Thus, the products that crystallize under particular conditions are hardly predictable. [5] On the contrary, the surfactant-directed self-assembly process has been well studied as a route to control mesostructures of sol-gel-derived mesoporous silica, which can be achieved under both thermodynamic and kinetic control.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Porous Materials with High Surface Area Derived from Bromophenylethenyl‐Functionalized Cubic Siloxane‐Based Building Units

Chaikittisilp

Sugawara

Shimojima

et al. 2010

Chemistry A European J

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117

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Sonogashira cross-coupling of bromophenylethenyl-terminated cubic, double four-ring, siloxane cages with di-/triethynyl compounds results in microporous poly(ethynylene aryleneethenylene silsesquioxane) networks, simply termed as polyorganosiloxane networks (PSNs). In comparison with porous organic polymers reported previously, these PSNs show relatively high surface area and comparable thermal stability. Their apparent BET specific surface areas vary in the range of 850-1040 m(2) g(-1) depending on the length and the connectable sites of the ethynyl compounds. Analyses of pore size distribution revealed bimodal micropores with relatively narrow distribution. The degree of cross-linking affects the degree of cleavage of the siloxane bonds, and this suggests that partial cleavage of the siloxane cages is mainly a result of cage distortion. Hydrogen adsorption was performed to evaluate potential of the PSNs as hydrogen storage media. Uptakes of up to 1.19 wt% at 77 K and 760 Torr and initial isosteric heats of adsorption as high as 8.0 kJ mol(-1) were observed. These materials have been obtained by a combination of structural, synthetic organic, and materials chemistry, which can exploited to synthesize porous hybrid materials with specifically designed structures and functions.

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“…It is well-known that the reaction conditions strongly affect the final crystal phase, size and morphology for zeolite synthesis [32]. Herein, a series of experiments were performed to investigate the effects of P 2 O 5 /Al 2 O 3 ratios and HF/Al 2 O 3 ratios, as well as P 2 O 5 /Ga 2 O 3 ratios and reaction temperature on the crystallization and phase transformation of the microporous aluminum and gallium phosphates, respectively.…”

Section: Effects Of Synthesis Conditions On the Crystallization And Pmentioning

confidence: 99%

Ionothermal synthesis of microporous aluminum and gallium phosphates

Han¹,

Wang²,

Zhang³

et al. 2008

Journal of Crystal Growth

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Phase selection of FAU and LTA zeolites by controlling synthesis parameters

Cited by 63 publications

References 28 publications

Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Hybrid Porous Materials with High Surface Area Derived from Bromophenylethenyl‐Functionalized Cubic Siloxane‐Based Building Units

Ionothermal synthesis of microporous aluminum and gallium phosphates

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