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Basic metallosilicate catalysts from waste green container glass

Basic metallosilicate catalysts from waste green container glass

Elmes, Victoria K., Edgar, Benjamin J., Mendham, Andrew P. and Coleman, Nichola J. (2018) Basic metallosilicate catalysts from waste green container glass. Ceramics International, 44 (14). pp. 17069-17073. ISSN 0272-8842 (doi:10.1016/j.ceramint.2018.06.151)

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Abstract

Environmental imperatives to conserve natural resources and to divert waste streams have stimulated significant interest in mineral recycling. This study illustrates that waste green container glass cullet is a suitable feedstock material for the facile synthesis of basic metallosilicate minerals that have potential as heterogeneous catalysts for industrially significant organic reactions. The target product phases, tobermorite (Ca⁠5Si⁠6O⁠16(OH)⁠2·4H⁠2O), lithium metasilicate (Li⁠2SiO⁠3) and hydroxycancrinite (Na⁠6Ca(AlSiO⁠4)⁠6(OH)⁠2·2H⁠2O) were synthesised by hydrothermal treatment of waste green cullet in alkaline media at 125°C for 14 days. The reaction products were characterised by powder X-ray diffraction analysis, Fourier transform infra-red spectroscopy and scanning electron microscopy. Phase-pure tobermorite (TB) was prepared from a mixture of glass and lime in sodium hydroxide solution. Impure lithium metasilicate (LS) containing minor proportions of portlandite and calcite was synthesised from the glass in lithium hydroxide solution. A mixed product of hydroxycancrinite (HC), with minor proportions of hydroxysodalite, tobermorite and hydrogarnet, was produced from the glass in a solution of aluminium and sodium hydroxides. All three glass-derived metallosilicate products were found to be effective catalysts for the Knoevenagel synthesis of ethyl (2E)-2-cyano-3-phenylacrylate from ethyl cyanoacetate and benzaldehyde. The order of catalytic efficacy followed the trend in basicity of the metallosilicate products, LS >TB > HC.

Item Type: Article
Uncontrolled Keywords: Tobermorite; Lithium metasilicate; Cancrinite; Sodalite; Catalysis; Knoevenagel condensation
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 01 Oct 2018 08:42
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/20471

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