Details
| Original language | English |
|---|---|
| Pages (from-to) | 399-410 |
| Number of pages | 12 |
| Journal | Journal of Ceramic Science and Technology |
| Volume | 8 |
| Issue number | 3 |
| Publication status | Published - 2017 |
Abstract
Sodium tetrahydroborate(NaBH4 = SB) and ammonia-borane(NH3BH3 = AB) were dissolved in sodium aluminate and silicate solutions. Bringing them together caused immediate gel formation and recrystallization of SB and AB during drying. The gel forms geopolymer (G) type units, which enclose and protect the SB and AB crystals inside. SBGcomposites are stable over a long time without any loss in SB.AnoptimizedSB-Greleases about 1820Lhydrogen per kg, i.e. containing an equivalent of about 80%of pure SB (2270 L/kg) obtained by means of acidic titration. SB and SBGremain stable up to 400 °C in vacuum and under inert gas conditions (He, Ar, N2). In air, a reaction starts at about 240°C, leading to a complete transformation to NaBO2 above about 320 °C. For SB-G, this reaction is retarded by 50°C. In the case of AB-G, IR-absorption spectra indicate that the geopolymer matrix consists of mainly sialate units (Si-O-Al-O). Heating experiments at temperatures of 120, 150 and 300 °C show the formation of polyaminoboranes (PAB) and polyiminoboranes (PIB). The underlying reactions could be related to hydrogen release in two exothermic peaks observed at around 122 °C and 160 °C. There are strong indications that DADB, the diammoniate of diborane, (NH3BH2)[BH]4, forms prior to hydrogen release in the first step.
Keywords
- AB-geopolymer, Hydrogen storage, SB-geopolymer
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
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In: Journal of Ceramic Science and Technology, Vol. 8, No. 3, 2017, p. 399-410.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Boronhydride-geopolymer composites
AU - Rüscher, C. H.
N1 - Funding information: Part of the work was supported by DFG under RU 764/6 – 1.
PY - 2017
Y1 - 2017
N2 - Sodium tetrahydroborate(NaBH4 = SB) and ammonia-borane(NH3BH3 = AB) were dissolved in sodium aluminate and silicate solutions. Bringing them together caused immediate gel formation and recrystallization of SB and AB during drying. The gel forms geopolymer (G) type units, which enclose and protect the SB and AB crystals inside. SBGcomposites are stable over a long time without any loss in SB.AnoptimizedSB-Greleases about 1820Lhydrogen per kg, i.e. containing an equivalent of about 80%of pure SB (2270 L/kg) obtained by means of acidic titration. SB and SBGremain stable up to 400 °C in vacuum and under inert gas conditions (He, Ar, N2). In air, a reaction starts at about 240°C, leading to a complete transformation to NaBO2 above about 320 °C. For SB-G, this reaction is retarded by 50°C. In the case of AB-G, IR-absorption spectra indicate that the geopolymer matrix consists of mainly sialate units (Si-O-Al-O). Heating experiments at temperatures of 120, 150 and 300 °C show the formation of polyaminoboranes (PAB) and polyiminoboranes (PIB). The underlying reactions could be related to hydrogen release in two exothermic peaks observed at around 122 °C and 160 °C. There are strong indications that DADB, the diammoniate of diborane, (NH3BH2)[BH]4, forms prior to hydrogen release in the first step.
AB - Sodium tetrahydroborate(NaBH4 = SB) and ammonia-borane(NH3BH3 = AB) were dissolved in sodium aluminate and silicate solutions. Bringing them together caused immediate gel formation and recrystallization of SB and AB during drying. The gel forms geopolymer (G) type units, which enclose and protect the SB and AB crystals inside. SBGcomposites are stable over a long time without any loss in SB.AnoptimizedSB-Greleases about 1820Lhydrogen per kg, i.e. containing an equivalent of about 80%of pure SB (2270 L/kg) obtained by means of acidic titration. SB and SBGremain stable up to 400 °C in vacuum and under inert gas conditions (He, Ar, N2). In air, a reaction starts at about 240°C, leading to a complete transformation to NaBO2 above about 320 °C. For SB-G, this reaction is retarded by 50°C. In the case of AB-G, IR-absorption spectra indicate that the geopolymer matrix consists of mainly sialate units (Si-O-Al-O). Heating experiments at temperatures of 120, 150 and 300 °C show the formation of polyaminoboranes (PAB) and polyiminoboranes (PIB). The underlying reactions could be related to hydrogen release in two exothermic peaks observed at around 122 °C and 160 °C. There are strong indications that DADB, the diammoniate of diborane, (NH3BH2)[BH]4, forms prior to hydrogen release in the first step.
KW - AB-geopolymer
KW - Hydrogen storage
KW - SB-geopolymer
UR - http://www.scopus.com/inward/record.url?scp=85029910195&partnerID=8YFLogxK
U2 - 10.4416/JCST2017-00051
DO - 10.4416/JCST2017-00051
M3 - Article
AN - SCOPUS:85029910195
VL - 8
SP - 399
EP - 410
JO - Journal of Ceramic Science and Technology
JF - Journal of Ceramic Science and Technology
SN - 2190-9385
IS - 3
ER -