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Waste Photovoltaic Panels for Ultrapure Silicon and Hydrogen through the Low-Temperature Magnesium Silicide.

SYSNO ASEP	0484211
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Waste Photovoltaic Panels for Ultrapure Silicon and Hydrogen through the Low-Temperature Magnesium Silicide.
Author(s)	Dytrych, Pavel (UCHP-M)_{RID, ORCID, SAI} Bumba, Jakub (UCHP-M)_SAI Kaštánek, František (UCHP-M)_{RID, SAI, ORCID} Fajgar, Radek (UCHP-M)_{RID, ORCID, SAI} Koštejn, Martin (UCHP-M)_{RID, SAI, ORCID} Šolcová, Olga (UCHP-M)_{RID, ORCID, SAI}
Source Title	Industrial and Engineering Chemistry Research. - : American Chemical Society - ISSN 0888-5885 Roč. 56, č. 45 (2017), s. 12863-12869
Number of pages	7 s.
Language	eng - English
Country	US - United States
Keywords	magnesium silicide ; waste photovoltaic panels ; ultrapure silicon
Subject RIV	CI - Industrial Chemistry, Chemical Engineering
OECD category	Chemical process engineering
R&D Projects	GA15-14228S GA ČR - Czech Science Foundation (CSF)
Institutional support	UCHP-M - RVO:67985858
UT WOS	000415785500003
EID SCOPUS	85034224326
DOI	10.1021/acs.iecr.7b01156
Annotation	Circulation technology of waste photovoltaic panels for production of ultrapure silicon and energy in the form of hydrogen storage was designed and verified. Preparation of magnesium silicide from waste photovoltaic panel's silicon and partially oxidized magnesium was thoroughly studied. Work was focused on process optimization, thus, three groups of reactors were tested, namely the continuously evacuated open reactor, pre evacuated batch reactor and semiopened reactors. The influence of reaction temperature was evaluated in the range of 330-630 degrees C for various reaction atmospheres, argon and/or air at pressures of 5, 33, and 100 kPa and vacuum in the range of 5-30 Pa. The effect of nitrogen and oxygen presence in the atmosphere on the resulted reaction and reaction rate was also thoroughly studied. The minimum reaction time guaranteeing the total conversion of silicon for two purifies of used magnesium was also determined. The produced materials were analyzed by dispersive Raman spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, and X-ray diffraction. Finally, the reactor filling, which significantly influenced the formation of magnesium silicide, was tested and established minimally at 30% of reactors volume. Hydrolysis of obtained magnesium silicide by diluted acid for silicon hydrides' (silanes) production and their subsequent thermal decomposition into the ultrapure silicon and hydrogen were successfully verified.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2018

Number of the records: 1