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New Silica Removal Technique by Vacuum Heating toward High-Performance Cryosorption Pumps Based on Biomass-Based Activated Carbon

Yuto YANAGIHARA¹⁾, Takanori MURASE¹⁾, Hiroyuki NOTO¹⁾, Kunihiro OGAWA^1,2), Akihiro SHIMIZU^1,2), Mitsutaka ISOBE^1,2), Kazuki NAGAHARA¹⁾, Hiroyuki TANOUE¹⁾, Sho NAKAGAWA¹⁾, Yuki HAYASHI^1,2), Ngat T.H. PHAM³⁾, Tomohiro SHIOZAKI³⁾, Toshiaki SOGABE³⁾ and Mudtorlep NISOA⁴⁾

1)

National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan

2)

The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Japan

3)

ANAORI CARBON Co., Ltd., 6-20 Hatakeda-cho, Ibaraki 567-0028, Japan

4)

Functional Materials & Nanotechnology CoE, Walailak University, Nakhon Si Thammarat, 80160, Thailand

(Received 15 December 2023 / Accepted 9 January 2024 / Published 27 February 2024)

Abstract

We developed a new silica (SiO₂) removal technique that can maximize biomass-based activated carbon adsorption performance. SiO₂ removal is one of the key processes in making activated carbon suitable for cryosorption pumps in fusion machines. In this study, we employed an evaporation process to remove SiO₂ by high-temperature vacuum heating. The charcoal made from rice straw was heated at 1800℃ for 1 h at approximately 10 Pa in a vacuum furnace. We found that SiO₂ amount was significantly reduced from 15.8 wt% to 4.20 wt% due to vacuum heating. In addition, the result of surface element mapping analysis using energy-dispersive X-ray spectroscopy (EDX) indicated a considerable decrease in the oxygen content of SiO₂. We demonstrated the great potential of activated carbon derived from rice straw as an adsorbent for high-performance cryosorption pumps.

Copyright (c) 2024 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

cryosorption pump, activated carbon, silica, vacuum heating, unutilized biomass

DOI: 10.1585/pfr.19.1205012

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