Hydrothermal synthesis of mesoporous materials from diatomaceous earth

Jing, Zhenzi; Maeda, Hirotaka; Ioku, Koji; Ishida, Emile H.

doi:10.1002/aic.11235

Cited by 35 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Meanwhile, the peak intensity of sepiolite decreases with curing time, and at 24 h it tends to disappear, which indicates that sepiolite can be consumed up for a long curing time. Comparison between the phase evolution and strength development shows that the CSH formation contributes significantly to the initial strength development, and the tobermorite formation gives the final strength development, in accordance with the result of Jing et al [17]. However, even with tobermorite formation, an overlong curing time exerts a negative influence on the strength development.…”

Section: Effect Of Curing Timesupporting

confidence: 76%

“…As has been reported in previous research [9][10][11], in the Ca-Si-Al-H system, formation of tobermorite or CSH gel could enhance strength. Because the CaO content was low in sepiolite, the slaked lime was added into RS so as to form tobermorite.…”

Section: Resultsmentioning

confidence: 58%

“…A hydrothermal processing method has been used to produce tough-products in the fields of synthesis of calcium silicate materials and treatment of inorganic wastes [9][10][11] recently. The hydrothermal processing method is considered an attractive method due to its low curing temperature (\473 K).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrothermal synthesis of porous materials from sepiolite

Wang

Jing

et al. 2011

Res Chem Intermed

Self Cite

View full text Add to dashboard Cite

In order not only to manufacture a tough porous material from sepiolite but also to sustain the inherent properties of the sepiolite, a hydrothermal experiment was carried out under saturated steam pressure at 473 K for up to 24 h by mixing slaked lime. The experimental results show that the addition of slaked lime exerts a positive effect on the strength development, and the strength enhancement is found to be due to tobermorite and calcium silicate hydrate (CSH) gel formation. Curing time seems to condition the strength development. A fine particle size of sepiolite improves its activity during the hydrothermal process, thus offering a higher strength and quicker hardening rate of the synthesized specimen. The acid activation also has a beneficial effect on the strength development. The hardening mechanism of the synthesized specimen is different between the specimens synthesized with or without acid activation. The strength enhancement for sepiolite with acid activating is due mainly to CSH gel formation, instead of tobermorite formation without acid activation.

show abstract

Section: Effect Of Curing Timesupporting

confidence: 76%

Section: Resultsmentioning

confidence: 58%

See 1 more Smart Citation

Hydrothermal synthesis of porous materials from sepiolite

Wang

Jing

et al. 2011

Res Chem Intermed

Self Cite

View full text Add to dashboard Cite

show abstract

“…[1][2][3] Compared with conventional microporous zeolites, however, these mesoporous materials have much weaker acidity and lower hydrothermal stability because of the amorphous nature of their mesoporous walls. 4 Although the incorporation of heteroatoms such as aluminum can generate catalytically active sites, the hydrothermal stability of the resulting aluminum-substituted mesostructural materials often become lower.…”

Section: Introductionmentioning

confidence: 99%

Bimodal micro‐mesoporous aluminosilicates for heavy oil cracking: Porosity tuning and catalytic properties

et al. 2008

View full text Add to dashboard Cite

in Wiley InterScience (www.interscience.wiley.com).Through a two-step synthesis procedure, bimodal micro-mesoporous aluminosilicates, denoted as B-MASs, were synthesized by assembling preformed zeolite Y nanoclusters using a triblock polymer as template. By controlling the aging conditions of preformed zeolite nanoclusters the porosity of the B-MASs was suitably tuned. The characterization results showed that the pore walls of the mesoporous phase in the B-MASs consist of zeolite Y nanoclusters and the microporosity of the B-MASs is inherited from the incorporated nanoclusters. It was suggested that more incorporation of the well-developed zeolite nanoclusters accounts for the increasing microporosity of the B-MASs with the increasing aging temperature of the preformed zeolite nanoclusters. The incorporated nanoclusters have much shorter pore channels and mainly contribute weak Lewis acid sites to the B-MASs. The resulting bimodal micro-mesoporous materials B-MASs with mutually connected mesopores and shorter micropores showed superior catalytic properties when used for cracking heavy crude oil.

show abstract

“…The tobermorite and CSH formations have been found to favor the strength development, therefore the cross effect of both might result in the highest strength achieved at 10 h. From the evolutions of tobermorite (increasing) and CSH gel (decreasing), it could be speculated that in the beginning of the synthesis, CSH gel formed, but, it was transferred to tobermorite later. Jing et al also pointed out that CSH was among the first phase formed and invariably appeared before tobermorite, and tobermorite was transformed inevitably from CSH Gel [12,23] .…”

Section: Effect Of Curing Timementioning

confidence: 95%

Synthesis and microstructure analysis of autoclaved aerated concrete with carbide slag addition

Fan

Cao

Jing

et al. 2014

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

Self Cite

View full text Add to dashboard Cite

Synthesis of autoclaved aerated concrete (AAC) has been carried out with carbide slag addition, and the carbide slag could be used as a main material to produce the AAC with the compressive strength about 2 MPa and the density below 0.6 g•cm 3 . In this study, quartz sand acted as frame structure phase in the matrix, and quartz addition also infl uenced the Si/Ca of starting material. Tobermorite and CSH gel were formed readily at 62%, which seemed to enhance the compressive strength of samples. Curing time seemed to affect the morphology of phase produced, and specimen with the plate-like tobermorite formed at 10 h appeared to have a better compressive strength development than the fi ber-like one at 18 h. The higher curing temperature seemed to favor the tobermorite and CSH gel formation, which also exerted a signifi cant effect on the strength development of the samples. On the micro-scale, the formed CSH gel was fi lled in the interface of the matrix, and the tobermorite appeared to grow in internal-surface of the pores and interstices. The tobermorite or/and CSH formation seemed to densify the matrix, and therefore enhanced the strength of the samples.

show abstract

Hydrothermal synthesis of mesoporous materials from diatomaceous earth

Cited by 35 publications

References 23 publications

Hydrothermal synthesis of porous materials from sepiolite

Hydrothermal synthesis of porous materials from sepiolite

Bimodal micro‐mesoporous aluminosilicates for heavy oil cracking: Porosity tuning and catalytic properties

Synthesis and microstructure analysis of autoclaved aerated concrete with carbide slag addition

Contact Info

Product

Resources

About