Synthesis of metal hydroxide-layer silicate intercalation compounds (metal = Mg(II), Ca(II), Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II))

Ohtsuka, Kunio; Suda, M.; Tsunoda, Masakiyo; Ono, Miyuki

doi:10.1021/cm00011a009

Cited by 22 publications

(15 citation statements)

References 6 publications

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“…Access to the gallery micropores was claimed for the LDH-Si802o 8-intercalates with gallery heights of ~7 ik. A related approach to mixed layered silicate metal (II) hydroxide compounds was reported by Ohtsuka et al (1990). The addition of a base to an aqueous suspension of sodium tetrasilicic mica exchanged with M(II) (Mg, Ca, Mn, Ni, Zn and Co, etc.)…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

Yun

Constantino

Pinnavaia

1995

Clays and clay miner.

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Abstract--Layered double hydroxides (LDH's) intedayered with silicate anions were prepared by reaction of tetraethylorthosilicate (TEOS)with synthetic meixnerite-like precursors of the type [MgI_~Al~(OH)2][OH-]~'zH20, where (1 -x)/x ~-2, 3, or 4. TEOS hydrolysis at ambient temperature occurred readily in the galleries of the hydroxide precursors with (1 -x)/x ~-3 or 4, but a temperature of ~ 100*C was required to achieve silicate intercalation for the LDH composition with (1 -x)/x ~ 2. On the basis of the observed gallery heights (~7.0-~7.2 ~) and 29Si MAS NMR spectra that indicated the presence of Q 2, Q3, and Q4 SiO4 sites, the intercalated silicate anions, which are formed by condensation reactions of silanol groups and partial neutralization of SiOH groups with gallery hydroxide ions, are assigned short chain structures. Also, some O3SiOH groups become grafted to the LDH layers by condensation with MOH groups on the gallery surfaces. The LDH-silicates exhibited comparable nonmicroporous N2 BET surface areas in the range 59-85 m2/g, but they differed substantially in acid/base reactivities, as judged by their relative activities for the catalytic dehydration/disproportionation of 2-methyl-3-butyn-2-ol (MBOH). Under reaction conditions where the LDH structure is retained (150"C), all the silicate intercalates showed mainly basic reactivities for the disproportionation of MBOH to acetone and acetylene. However, all the LDH silicates were less reactive than the corresponding LDH carbonates. Conversion of the LDH silicates to metal oxides at 450"C introduced acidic activity for MBOH dehydration, whereas the metal oxides formed by LDH carbonate decomposition were exclusivity basic under analogous conditions.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

Yun

Constantino

Pinnavaia

1995

Clays and clay miner.

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“…In future work, these mechanisms will be examined for natural clay minerals, such as montmorillonite. Performing the cation exchange at a slightly increased pH (>8) is shown in the literature 46 − 48 to produce condensed chlorite-type interlayers only and therefore may double the adsorption capacity for CO 2 . Given the compact nature of clay minerals, this can make them volumetrically competitive compared to MOFs and mesoporous carbon.…”

Section: Discussionmentioning

confidence: 99%

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

et al. 2021

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Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that with a decreasing interlayer surface charge in a clay mineral, the adsorption capacity for CO 2 increases, while the pressure threshold for adsorption and swelling in response to CO 2 decreases. Synthetic nickel-exchanged fluorohectorite was investigated with three different layer charges varying from 0.3 to 0.7 per formula unit of Si 4 O 10 F 2 . We associate the mechanism for the higher CO 2 adsorption with more accessible space and adsorption sites for CO 2 within the interlayers. The low onset pressure for the lower-charge clay is attributed to weaker cohesion due to the attractive electrostatic forces between the layers. The excess adsorption capacity of the clay is measured to be 8.6, 6.5, and 4.5 wt % for the lowest, intermediate, and highest layer charges, respectively. Upon release of CO 2 , the highest-layer charge clay retains significantly more CO 2 . This pressure hysteresis is related to the same cohesion mechanism, where CO 2 is first released from the edges of the particles thereby closing exit paths and trapping the molecules in the center of the clay particles.

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“…This reaction produces a structure similar to chlorite. The transition metals of Mn 2+, Fe 2+, Co 2+, and Ni 2+ show similar intercalating behavior as more typical non-transition metals, such as Mg e § or AP + (Brindley and Kao, 1980;Ohtsuka et al, 1990;Yamanaka and Brindley, 1978). Transition elements generate interesting physical properties, including two-dimensional magnetic effects (e.g., Takahashi et al, 1986Takahashi et al, , 1988.…”

Section: Introductionmentioning

confidence: 96%

“…The mica-like material, NaMgzsSi4010F2, used by Ohtsuka et al (1990) and Takahashi et al (1986Takahashi et al ( , 1988) is similar to vermiculite owing to its high layer charge. However, its properties are similar to smectite in both small particle size and high-swelling behavior.…”

Section: Introductionmentioning

confidence: 99%

A Nickel Hydroxide-Vermiculite Complex: Preparation and Characterization

Uehara

1999

Clays and clay miner.

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Abstract--A nickel hydroxide-vermiculite complex (NHVC) with csin~ = 1.41 nm and particle sizes from 0.075 to 0.15 mm was obtained hydrothermally by adding nickel nitrate solution to vermiculite from Transvaal, South Africa. The quantity of nickel hydroxide included in NHVC was controlled by adjusting the concentration of the nickel nitrate solution. The thermal behavior of NHVC at 450~ or above was independent of the Ni content. However, small differences exist in the dehydration behavior of NHVC below 450~ One-dimensional Fourier electron density analysis of the NHVC structure containing 2.43 mol of Ni per half unit cell showed that Ni cations occupy the interlayer of NHVC, and 10% of the total Ni cations is in the ditrJgonal cavity of the basal-oxygen plane of the tetrahedral sheet.

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Synthesis of metal hydroxide-layer silicate intercalation compounds (metal = Mg(II), Ca(II), Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II))

Cited by 22 publications

References 6 publications

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

A Nickel Hydroxide-Vermiculite Complex: Preparation and Characterization

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Synthesis of metal hydroxide-layer silicate intercalation compounds (metal = Mg(II), Ca(II), Mn(II), Fe(II), Co(II), Ni(II), Zn(II), and Cd(II))

Cited by 22 publications

References 6 publications

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

Synthesis and Catalytic Properties of Silicate-Intercalated Layered Double Hydroxides Formed by Intragallery Hydrolysis of Tetraethylorthosilicate

CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

A Nickel Hydroxide-Vermiculite Complex: Preparation and Characterization

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CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral