Synthesis of Dense Y-zeolite Bulks with Large Surface Area Using a Hydrothermal Hot-pressing (HHP) Process

Nakahira, Atsushi; Takezoe, Shinichi; Yamasaki, Yoshio

doi:10.1246/cl.2004.1400

Cited by 25 publications

(20 citation statements)

References 11 publications

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“…The average heating rate was about 80 º C /min and sintering time was 5 minutes in this process. The phosphates were also used as the starting powder for hydrothermal hot pressing (HHP) method [12][13][14]. The mixture of powder and water or ethanol were set in a mold and mechanically pressed with a uni-axial pressure and subsequently heated at 150 and 200 ºC for 2 hours.…”

Section: Synthesis Of Cerium Polyphosphate Bulksmentioning

confidence: 99%

Synthesis and Electrical Conductivity of Tetra-Valent Cerium Polyphosphate Bulks

Onoda

Inagaki

Kuwabara

et al. 2009

Phosphorus Research Bulletin

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Tetra-valent cerium phosphate was synthesized from cerium oxide and phosphoric acid by heating. The sintering processes, pressure-less sintering (PLS), spark plasma sintering (SPS), and hydrothermal hot pressing (HHP), were tried to obtain polyphosphate bulks. Furthermore, the electrical conductivity of cerium polyphosphate bulks was investigated. Tetra-valent cerium phosphate was synthesized by heating at 700ºC for 20 hours. The hydrothermal hot pressing process was the suitable method to synthesize the tetra-valent cerium phosphate bulk. Y doped Ce(PO 3 ) 4 had higher conductivity than other rare earth phosphates. A part of tetra-valent cerium cation was considered to reduce tri-valent cerium cation and then to work as a dopant.

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Section: Synthesis Of Cerium Polyphosphate Bulksmentioning

confidence: 99%

Synthesis and Electrical Conductivity of Tetra-Valent Cerium Polyphosphate Bulks

Onoda

Inagaki

Kuwabara

et al. 2009

Phosphorus Research Bulletin

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“…The discontinuity of a micropore channel network between zeolite crystals and grain boundaries was reported to be caused by the introduction of voids, pinholes and amorphous phases into the zeolite crystals. 15) The dissolution of natural zeolite is proposed to lead to the partial collapse of the microporous structure of the zeolite in the hydrothermal treatment. That is, the discontinuity of the micropore channel network causes the reduction of the micropore volume in samples after treatment.…”

Section: Jcs-japanmentioning

confidence: 99%

Hydrothermal solidification of zeolite/tobermorite composites

Maeda

Okada

Ishida

2009

J. Ceram. Soc. Japan

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Novel zeolite/tobermorite composites were prepared by hydrothermal treatment of a powder-compact consisting of mordenite and slaked lime. Tobermorite formed after the hydrothermal process due to the reaction of mordenite and slaked lime. The bending strength after the hydrothermal process was more than 7 MPa. X-ray diffraction analysis results showed that mordenite remained after the hydrothermal treatment, resulting in the existence of inherent micropores of mordenite in the composites. The composites exhibited a broad mesopore size distribution of more than 6 nm. The improvement in strength, mesopore formation, and specific surface area of the composites depended on the amount and size of the tobermorite that was formed.

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“…It has been reported that various inorganic materials can produce solid bodies from high-level radioactive-waste, [8][9][10] for recycling as glass powder 11-14 using HHP methods. Nakahira et al 15,16 reported that solidified Y-zeolites having high values of specific surface areas were successfully obtained by this HHP method. In this study, we report the results of synthesis of the bulky and dense mesoporous silica FSM bodies from FSM powder with and without a surfactant as a starting powder for HHP.…”

Section: Introductionmentioning

confidence: 98%

Synthesis and Characterization of Bulky FSM with Interconnected Mesopore-Networks Using an HHP Method

麻里

英純

友紀³

et al. 2006

J. Ceram. Soc. Japan

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In this study, the synthesis of bulky FSM materials was attempted by a hydrothermal hot-pressing HHP method at relatively low temperatures. The obtained FSM bulks had dense microstructures without large voids and extremely high values of specific surface areas of over 1000 m 2 g. TEM observations showed that the bulks synthesized by this HHP method possessed a regular hexagonal arrangement of uniform mesopores and no amorphous phase at the interface between FSM grains, leading to bulky FSM bodies with interconnected mesopore-networks. As a result, dense bulky bodies with hexagonal structured mesopores and high values of specific surface areas could be obtained by this HHP method. These bulky FSM bodies are expected to be applicable as catalysts, adsorbents, sensors, electronics materials, and so on.

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Synthesis of Dense Y-zeolite Bulks with Large Surface Area Using a Hydrothermal Hot-pressing (HHP) Process

Abstract: Highly dense and large bulk Y-zeolites (1.5 mm in thickness and 20 mm in diameter) with a significantly large surface area over 700 m2/g were obtained by a short-term hydrothermal hot-pressing (HHP) treatment at 423 K for 2 h, comparable with the Y-zeolite powder.

Cited by 25 publications

References 11 publications

Synthesis and Electrical Conductivity of Tetra-Valent Cerium Polyphosphate Bulks

Synthesis and Electrical Conductivity of Tetra-Valent Cerium Polyphosphate Bulks

Hydrothermal solidification of zeolite/tobermorite composites

Synthesis and Characterization of Bulky FSM with Interconnected Mesopore-Networks Using an HHP Method

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