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Browsing by Author "Petrik, LF"

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Conversion of South African clays into high quality zeolites

Author: Musyoka, Nicholas M ; Missengue, R ; Kusisakana, M ; Petrik, LF Date: Aug 2014 Clays obtained from South Africa were used as feedstock materials for the synthesis of zeolites. The conventional alkaline hydrothermal treatment of the starting material (90 °C for 8 h)was preceded by a fusion step (550 °C for 1.5 h) to ... Read more
Conversion of South African coal fly ash into high-purity ZSM-5 zeolite without additional source of silica or alumina and its application as a methanol-to-olefins catalyst

Author: Missengue, RNM ; Losch, P ; Musyoka, Nicholas M ; Louis, B ; Pale, P ; Petrik, LF Date: Mar 2018 Characteristics of ZSM-5 synthesized from H2SO4-treated coal fly ash and fused coal fly ash extracts are compared in this study. In the synthesis process, fused coal fly ash extract (without an additional silica source) was used in the synthesis ... Read more
Electrospun zeolite-templated carbon composite fibres for hydrogen storage applications

Author: Annamalai, Perushini ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Bessarabov, D ; Petrik, LF Date: Jan 2017 The current study explored the application of the electrospinning technique to produce multi-hierarchical composites for hydrogen storage applications. Predetermined control of fibre porosity is expected to enable production of well-defined ... Read more
Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach

Author: Madzivire, G ; Gitari, WM ; Kumar Vadapalli, VR ; Ojumu, TV ; Petrik, LF Date: Oct 2011 The treatment of acid mine drainage (AMD) and circumneutral mine water (CMW) with South African coal fly ash (FA) provides a low cost and alternative technique for treating mine wastes waters. The sulphate concentration in AMD can be reduced ... Read more
Hydrothermal conversion of South African coal fly ash into pure phase Zeolite Na-P1

Author: Gitari, MW ; Petrik, LF ; Musyoka, Nicholas M Date: Aug 2016 South African coal combustion power utilities generate huge amounts of coal fly ash that can be beneficiated into zeolitic products. This chapter reports on the optimization of the presynthesis and synthesis conditions for a pure-phase zeolite ... Read more
Influence of aluminium source on the crystal structure and framework coordination of Al and Si in fly ash-based zeolite NaA

Author: Ameh, AE ; Fatoba, OO ; Musyoka, Nicholas M ; Petrik, LF Date: Jan 2017 In this study zeolite NaA with different crystal sizes and % crystallinity was prepared from a clear solution extract of fused fly ash. Sodium aluminate or aluminium hydroxide was used to adjust the aluminium content in the fused fly ash ... Read more
Integrated acid mine drainage management using fly ash

Author: Vadapalli, VRK ; Gitari, MW ; Petrik, LF ; Etchebers, O ; Ellendt, A Date: Jan 2012 Fly Ash (FA) from a power station in South Africa was investigated to neutralise and remove contaminants from Acid Mine Drainage (AMD). After this primary treatment the insoluble FA residue namely solid residue (SR) was investigated as a ... Read more
Leaching and antimicrobial properties of silver nanoparticles loaded onto natural zeolite clinoptilolite by ion exchange and wet impregnation

Author: Missengue, RNM ; Musyoka, Nicholas M ; Madzivire, G ; Babajide, O ; Fatoba, OO ; Tuffin, M ; Petrik, LF Date: Nov 2015 This study aimed to compare the leaching and antimicrobial properties of silver that was loaded onto the natural zeolite clinoptilolite by ion exchange and wet impregnation. Silver ions were reduced using sodium borohydride (NaBH(sub4)). The ... Read more
Synthesis of zeolite NaA membrane from fused fly ash extract

Author: Ameh, AE ; Musyoka, Nicholas M ; Fatoba, OO ; Syrtsova, DA ; Teplyakov, VV ; Petrik, LF Date: Jan 2016 Zeolite-NaA membranes were synthesized from an extract of fused South African fly ash on a porous titanium support by a secondary growth method. The influence of the synthesis molar regime on the formation of zeolite NaA membrane layer was ... Read more
Transformation of fly ash based nanosilica extract to BEA zeolite and its durability in hot liquid

Author: Ameh, AE ; Fatoba, OO ; Musyoka, Nicholas M ; Louis, B ; Petrik, LF Date: Oct 2020 Power generation in South Africa relies heavily on the combustion of coal and during this process, coal fly ash (CFA) is generated as by-product, which raises several environmental issues. The transformation of CFA into a value added zeolite ... Read more
Transformation of South African coal fly ash into ZSM-5 zeolite and its application as an MTO catalyst

Author: Missengue, RNM ; Losch, P ; Sedres, G ; Musyoka, Nicholas M ; Fatoba, OO ; Louis, B ; Pale, P ; Petrik, LF Date: Jan 2017 This study presents a way of using South African coal fly ash by extracting metals such as Al and Fe with concentrated sulphuric acid, and then using the solid residue as a feedstock for the synthesis of ZSM-5 zeolite. The percentage of ... Read more

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Browsing by Author "Petrik, LF"

Browsing by Author "Petrik, LF"

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