Synthesis of iron-silicate analogs of zeolite beta

Kumar, Rajiv; Thangaraj, A.; Bhat, R.N.; Ratnasamy, P.

doi:10.1016/0144-2449(90)90023-k

Cited by 77 publications

(16 citation statements)

References 11 publications

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“…Some minor ingredients such as Class F fly ash and metakaolin conforming to ASTM C 618, and limestone powder (median particle size of 0.7 lm) conforming to ASTM C 568 were also used in the binder synthesis [12]. Fly ash provides a silica source for the reactions (to potentially facilitate iron silicate complexation [14]), while the fine limestone powder provides nucleation sites. Metakaolin imparts cohesiveness to the paste mixtures because of its clayey origins.…”

Section: Materials Mixtures and Specimen Preparationmentioning

confidence: 99%

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Das

Hendrix

Stone

et al. 2015

Construction and Building Materials

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h i g h l i g h t sFracture response of a novel iron-based binder system brought out. Significantly higher fracture properties as compared to OPC systems. Superior influence of the unreacted metallic particles in the system elucidated. Digital image correlation method used for fracture property determination. a b s t r a c tThis paper explores the fracture properties of a novel and sustainable glass-fiber reinforced composite, the matrix for which is formed through the aqueous, anoxic, room-temperature carbonation of (waste) metallic iron powder along with other minor ingredients. A comparison of the properties of this binder with Ordinary Portland Cement pastes, which constitutes one of the most common and economic ceramic matrices is also provided. The iron-based binder system exhibits fracture parameters (fracture toughness, K IC S and critical crack tip opening displacement, CTOD C , determined using two parameter fracture model, TPFM) that are significantly higher when compared to those of the OPC systems in both the unreinforced and glass fiber reinforced states. The beneficial influence of the unreacted metallic iron particles of large aspect ratio, on the fracture parameters of iron-based binders are elucidated. The strain energy release rates show trends that are in line with the fracture parameters from TPFM. The elastic and inelastic components of strain energy release rate are separated in an effort to capture the fundamental toughening mechanisms in these systems. The fracture parameters determined using a non-contact, digital image correlation technique are found to relate well to those obtained from TPFM.

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Section: Materials Mixtures and Specimen Preparationmentioning

confidence: 99%

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Das

Hendrix

Stone

et al. 2015

Construction and Building Materials

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“…Framework exchange of transition metals in zeolites has also received great attention. For example iron, cobalt, vanadium, and titanium‐exchanged zeolites have been synthesized and characterized. Owing to the growing importance of transition‐metal‐exchanged zeolites, a large number of theoretical studies concerning transition‐metal‐exchanged zeolites have appeared …”

Section: Introductionmentioning

confidence: 99%

Exploring Scaling Relations for Chemisorption Energies on Transition‐Metal‐Exchanged Zeolites ZSM‐22 and ZSM‐5

et al. 2016

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Copper exchange on all the different T sites of ZSM‐22 and ZSM‐5 is considered and the chemisorption energies of dioxygen, OH, and O species are studied. We show that for different T sites the adsorption energies vary significantly. The oxygen adsorption energy on copper‐exchanged zeolites is quite similar to those of the most selective catalysts for oxidation reactions, that is, Ag and Au surfaces. The chemisorption energies of oxygen, carbon‐, and nitrogen‐containing species on different transition metals exchanged in ZSM‐22 are also investigated. The study covers three different oxidation states, that is, 1+, 2+, and 3+ for the transition‐metal exchanges. Scaling relations are presented for the corresponding species. Chemisorption of O scales with chemisorption of OH for all three considered exchanges, whereas there are essentially rough correlations for NH2 and N as well as CH3 and C.

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“…In addition to the iron powder, the minor ingredients used in binder synthesis include Class F fly ash and metakaolin conforming to ASTM C 618, and limestone powder (median particle size of 0.7 µm) conforming to ASTM C 568. Fly ash was used to provide a silica source for the reactions (to potentially facilitate iron silicate complexation [22,23]), while the fine limestone powder provides nucleation sites and metakaolin provides cohesiveness to the paste mixtures [17]. In the process of iron carbonation, water is only a mediator in the reactions which serves as an agent of mass-transfer and does not as such chemically participate in the reactions.…”

Section: Starting Materials: Composition and Particle Sizesmentioning

confidence: 99%

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

Das

Stone

Convey

et al. 2014

Materials Characterization

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The pore-and micro-structural features of a novel binding material based on the carbonation of waste metallic iron powder is reported in this paper. The binder contains metallic iron powder as the major ingredient, followed by additives containing silica and alumina to facilitate favorable reaction product formation. Compressive strengths sufficient for a majority of concrete applications are attained. The material pore structure is investigated primarily through mercury intrusion porosimetry whereas electron microscopy is used for microstructural characterization. Reduction in the overall porosity and the average pore size with an increase in carbonation duration from 1 day to 4 days are noticed. The pore structure features are used in predictive models for gas and moisture transport (water vapor diffusivity and moisture permeability) through the porous medium which dictates its long-term durability when used in structural applications. Comparisons of the pore structure with those of a Portland cement paste are also provided. The morphology of the reaction products in the iron-based binder, its elemental composition and the distribution of constituent elements in the microstructure are also reported.

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Synthesis of iron-silicate analogs of zeolite beta

Cited by 77 publications

References 11 publications

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Exploring Scaling Relations for Chemisorption Energies on Transition‐Metal‐Exchanged Zeolites ZSM‐22 and ZSM‐5

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

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