The manufacturing process of fine Shirasu balloons using a fluidized sand-bed furnace

Sodeyama, Kenichi; Sakka, Yoshio; Kamino, Yoshitaka; Seki, Hiromitsu; Nishimoto, Kenryo; Yazaki, Makoto

doi:10.1163/156855200750172097

Cited by 10 publications

(13 citation statements)

References 5 publications

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“…[34] In Japan, hollow glass microspheres, named as Shirasu-balloons (SB), have been produced from vitric volcaniclastic materials, named as Shirasu or Hakudo (a kind of the "perlite"). [35] Its application such as adsorbents has advantages in reducing amount of solid waste and the cost for the treatment. The present study investigated influence of impregnation conditions of supported copper species and kinds of the Shirasubased materials on catalytic performance of low cost and highly active copper-supported Shirasu-based catalyst for N 2 O decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…Most Shirasu is disposed as solid waste to landfills and is expected to be found for its useful applications [34] . In Japan, hollow glass microspheres, named as Shirasu‐balloons (SB), have been produced from vitric volcaniclastic materials, named as Shirasu or Hakudo (a kind of the “perlite”) [35] . Its application such as adsorbents has advantages in reducing amount of solid waste and the cost for the treatment.…”

Section: Introductionmentioning

confidence: 99%

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Decomposition of Nitrous Oxide using a Copper‐supported Shirasu Catalyst

Umegaki

Noguchi

Fukumoto³

2022

ChemistrySelect

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This work firstly reported catalytic activity of copper species supported on Shirasu-based materials for decomposition of nitrous oxide. From the results of EDS and XPS analyses, the bulk and surface compositions of the supported copper species depends on its impregnation conditions. The copper species were preferably supported on the surface silica sites of the Shirasu-based materials with addition of ammonia during the impregnation process, and the amount of the copper species increased with increasing the amount of ammonia. The catalysts with the active copper species preferably supported on the silica sites exhibited high activity for decomposition of nitrous oxide. The catalytic activity also depended on the kinds of Shirasu-based materials, and the copper-supported catalyst on a Shirasu balloon, A3NN, showed the highest activity. The catalytic activity improved with addition of ammonia into the feed reactant gas, and nitrous oxide in the mixed gas was completely decomposed above 673 K.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decomposition of Nitrous Oxide using a Copper‐supported Shirasu Catalyst

Umegaki

Noguchi

Fukumoto³

2022

ChemistrySelect

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“…The surface of microballoons is smooth and considered to be difficult to contribute to calcium phosphate nucleation. Besides, microballoons and their raw materials are aluminosilicates [11] . Generally, aluminosilicates contain charge compensating cations such as alkali metal ions because they are negatively charged due to the alumina moiety in framework.…”

Section: Results and Discussion 31 Homogeneous Precipitation Processmentioning

confidence: 99%

Hydroxyapatite Coating of Volcanic Glass Microballoons by a Homogeneous Precipitation Process

Hagiri

Urita

2019

Trans. Mat. Res. Soc. Japan

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Volcanic glass microballoons (so-called Shirasu balloons) are produced via the expansion of hot volcano ash sand. This work assessed the application of a biocompatible hydroxyapatite (HAp) coating to this material, which both floats in most solvents and has extremely thin outer shells. A two-step process consisting of homogeneous precipitation followed by conversion of the crystal phase using static liquid immersion was found to be effective for this purpose. A uniform HAp coating was obtained by converting the initial calcium phosphate layer to HAp by immersing the microballoons in an optimized solution under static conditions.

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“…Since Shirasu is generally sandy, the research on the use of Shirasu as ne aggregate has been investigated for long years. Most Shirasu is now disposed as solid waste to land lls [5]. Hollow glass microspheres, named as Shirasu-balloons (SB), have been produced from vitric volcaniclastic materials, named as Shirasu or Hakudo (a kind of the "perlite") [6].…”

Section: Introductionmentioning

confidence: 99%

Function of Shirasu-based materials for acid-promoted hydrolysis of ammonia borane

Umegaki

Noguchi

Fukumoto

2022

Preprint

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The present study investigated influence of various treatment on activity of Shirasu-based materials for hydrogen evolution from aqueous ammonia borane solution. Various solution treatments and calcination treatment significantly affected on the morphology, compositions, and activity. The sample with high surface aluminum ratio and low silicon oxide crystalline impurity showed high activity for the hydrogen evolution. The sample treated with treated with ammonia following calcination at 723 K included the highest surface aluminum ratio and the lowest silicon oxide crystals impurity and exhibited the highest activity for the hydrogen evolution.

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The manufacturing process of fine Shirasu balloons using a fluidized sand-bed furnace

Cited by 10 publications

References 5 publications

Decomposition of Nitrous Oxide using a Copper‐supported Shirasu Catalyst

Decomposition of Nitrous Oxide using a Copper‐supported Shirasu Catalyst

Hydroxyapatite Coating of Volcanic Glass Microballoons by a Homogeneous Precipitation Process

Function of Shirasu-based materials for acid-promoted hydrolysis of ammonia borane

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