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Browsing by Author "Musyoka, Nicholas M"

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Clay and clay-supported materials for clean energy storage applications

Author: Musyoka, Nicholas M ; Langmi, Henrietta W Date: 2015 The dwindling fossil energy reserves together with the need to find cleaner energy sources have intensified investigations for alternative energy sources. Solar energy, batteries and hydrogen have featured prominently amongst the most promising ... Read more
Co-pelletization of a zirconium-based metalorganic framework (UiO-66) with polymer nanofibers for improved useable capacity in hydrogen storage

Author: Bambalaza, Sonwabo E ; Langmi, HW ; Mokaya, R ; Musyoka, Nicholas M ; Khotseng, LE Date: Dec 2020 We report on a concept of co-pelletization using mechanically robust hydroxylated UiO-66 to develop a metal-organic framework (MOF) monolith that contains 5 wt% electrospun polymer nanofibers, and consists of an architecture with alternating ... Read more
Compaction of a zirconium metal–organic framework (UiO-66) for high density hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Mokaya, R ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: Nov 2018 We report a rare case whereby a metal–organic framework (MOF), namely UiO-66, is compacted at high pressure (700 MPa or 100 000 psi) resulting in densification and improved total volumetric hydrogen storage capacity, but crucially, without ... Read more
A comparison of hydrogen storage capacity of commercial and fly ash-derived zeolite X together with their respective templated carbon derivatives

Author: Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Oct 2015 This paper presents comparative results of structural, morphological and hydrogen sorption properties between commercial and fly ash-derived zeolite X including their respective templated carbon derivatives. The surface area of commercial ... Read more
Comparison of MOF-5- and Cr-MOF-derived carbons for hydrogen storage application

Author: Segakweng, T ; Musyoka, Nicholas M ; Ren, Jianwei ; Crouse, P ; Langmi, Henrietta W Date: Nov 2015 Nanoporous carbons which possess high surface areas and narrow pore size distributions have become one of the most important classes of porous materials with potential to be utilized for hydrogen storage. In recent times, several metal–organic ... Read more
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
Current research trends and perspectives on materials-based hydrogen storage solutions: A critical review

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Liao, S Date: Jan 2016 Effective hydrogen storage solutions have been pursued for decades, and materials-based hydrogen storage is a research frontier of much current interest. Yet, no researched materials to date have come close to the DOE 2020 targets for hydrogen ... Read more
Development of functional metal-organic frameworks (MOFs) for storing hydrogen in para form

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K Date: Dec 2016 In this work, enrichment of para-hydrogen is performed by flowing ultra-purity hydrogen gas at low temperature (77K) in the presence of a developed catalyst anchored in a MOF hybrid material. This approach fits within the bigger scope of the ... Read more
Effect of inclusion of MOF-polymer composite onto a carbon foam material for hydrogen storage application

Author: Molefe, Lerato Y ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Ndungu, PG Date: Aug 2020 Despite the extensive studies done on the remarkable characteristics of metal–organic frameworks (MOFs) for gas storage applications, several issues still preclude their widespread commercial lightweight applications. In most cases, MOF ... Read more
Electrospun MOF nanofibers as hydrogen storage media

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Annamalai, P ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Jun 2015 In this study, Zr-MOF and Cr-MOF were chosen as representatives of the developed MOFs in our laboratory and were incorporated into electrospun nanofibers. The obtained MOF nanofibers composites were evaluated as hydrogen storage media. The ... 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
Experimental demonstration of dynamic temperature-dependent behavior of UiO-66 metal-organic framework: Compaction of hydroxylated and dehydroxylated forms of UiO-66 for high-pressure hydrogen storage

Author: Bambalaza, Sonwabo E ; Langmi, HW ; Mokaya, R ; Musyoka, Nicholas M ; Khotseng, LE Date: May 2020 High-pressure (700 MPa or ∼100 000 psi) compaction of dehydroxylated and hydroxylated UiO-66 for H2 storage applications is reported. The dehydroxylation reaction was found to occur between 150 and 300 °C. The H2 uptake capacity of powdered ... Read more
Fabrication of core-shell MIL-101(Cr)@UiO-66(Zr) nanocrystals for hydrogen storage

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Sep 2014 The fabrication of coreeshell nanocrystals by incorporating microporous UiO-66 into mesoporous MIL-101 is reported. The growth of the coreeshell MIL-101@UiO-66 nanocrystals was observed and supported by TEM and PXRD. The accessible pore volumes ... Read more
A facile segregation process and restoration of LiMn2O4 cathode material from spent lithium-ion batteries

Author: Palaniyandy, Nithyadharseni ; Rambau, Khavharendwe MA ; Musyoka, Nicholas M ; Ren, Jianwei Date: Apr 2020 Due to its three-dimensional tunnel structure, the spinel LiMn2O4 (LMO) cathode material is highly favourable for the migration of lithium ions. Thus, LMO has been used as a commercial cathode material for the electronic devices such as mobile ... Read more
Feasibility of varied polyethylene terephthalate wastes as a linker source in metal-organic framework UiO-66(Zr) synthesis

Author: Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Ren, Jianwei ; Mathe, Mahlanyane K ; Onyango, MS Date: Aug 2019 Polyethylene terephthalate (PET), a chemically stable polyester with multiple applications, has risen dramatically in manufacturing and consumption in the past decades. The increase in PET use has resulted in considerable volumes of waste PET ... Read more
From biogas to hydrogen: A techno-economic study on the production of turquoise hydrogen and solid carbons

Author: Swartbooi, Ashton ; Kapanji-Kakoma, KK ; Musyoka, Nicholas M Date: Sep 2022 Biogas is a renewable feedstock that can be used to produce hydrogen through the decomposition of biomethane. However, the economics of the process are not well studied and understood, especially in cases where solid carbons are also produced, ... Read more
Green synthesis of chromium-based metal-organic framework (Cr-MOF) from waste polyethylene terephthalate (PET) bottles for hydrogen storage applications

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Onyango, MS Date: Oct 2016 It is of great economic value to produce high-value PET-based MOF materials by the veritable elimination of waste PET, and provide sufficient MOF materials for hydrogen storage applications. Consequently, this work demonstrates the use of ... 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
In-situ IR monitoring of the formation of Zr-fumarate MOF

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: May 2017 The in-situ IR technique was employed to monitor the crystallisation process of Zr-fumarate (Zr-fum) MOF under real synthesis conditions. The results evidenced the participations of both modulator acid (HCOOH) and solvent (DMF) during the ... Read more

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