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Your search keyword '"Ngema, Peterson Thokozani"' showing total 6 results
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6 results on '"Ngema, Peterson Thokozani"'

1. CO2methanation: a bibliometric analysis and review of activated carbon-based materials (2014–24)

Author

Akpasi, Stephen Okiemute, Isa, Yusuf Makarfi, Monama, Thembisile Patience, Kiambi, Sammy Lewis, and Ngema, Peterson Thokozani

Abstract

This study highlights the significant potential of activated carbon (AC)-based materials in environmental remediation and energy production, particularly in converting carbon dioxide (CO2) and hydrogen (H2) into methane (CH4) and water (H2O) using transition metal-based catalysts. It emphasizes the role of porous AC in waste reduction and resource utilization, examining various applications of CO2and evaluating environmental impacts. The research explores commercialization opportunities and specifically investigates CO2methanation using AC-based materials. Using bibliometric analyses of 4196 articles from the Web of Science database, the study identifies a growing research interest in porous AC-related CO2methanation from 2014 to 2024. The top three journals in this field are Environment Development and Sustainability, Biomass Conversion and Biorefinery, and Journal of Environment Science and Pollution. However, there is limited inter-institutional collaboration in this field, suggesting room for development towards commercializing sustainable CH4production pathways. CH4is highlighted as a crucial intermediate in industrial processes, and research directions are identified through co-occurring author keywords analysis. The study suggests the need for a comprehensive approach integrating AC materials into carbon-neutral energy processes while addressing the potential adverse effects of AC nanoparticles on biological and environmental factors. Ultimately, it clarifies the potential uses and commercialization prospects for porous AC materials, especially in conjunction with carbon capture and utilization technologies, promoting sustainable practices in energy production and environmental management.The potential of activated carbon-based materials in environmental remediation and energy production is reviewed, particularly for converting carbon dioxide and hydrogen into methane and water using transition metal catalysts. The role of porous activated carbon in waste reduction and resource utilization is emphasized.Graphical Abstract

Published
2024
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6. Thermodynamic stability conditions of clathrate hydrates for refrigerant (R134a or R410a or R507) with MgCl2 aqueous solution.

Author

Ngema, Peterson Thokozani, Naidoo, Paramespri, Mohammadi, Amir H., Richon, Dominique, and Ramjugernath, Deresh

Subjects
*THERMODYNAMICS, *THERMAL stability, *MAGNESIUM chloride, *GAS hydrates, *REFRIGERANTS, *AQUEOUS solutions
Abstract

Clathrate hydrate dissociation data were measured for systems comprising of refrigerants (R134a, R410a and R507) + water + MgCl 2 at varying salt concentrations. The ternary system for R134a + water + MgCl 2 was measured at salt concentrations of (0.259, 0.546, and 0.868) mol.kg −1 in the temperature range of (277.1–283) K and a pressure range of (0.114–0.428) MPa. Hydrate measurements for the {R410a or R507} + water + MgCl 2 systems were measured at salt concentrations of (0.259 and 0.546) mol.kg −1 in the temperature range of (274.3–293) K and a pressure range of (0.154–1.421) MPa. The isochoric pressure-search method was used to measure the hydrate dissociation data. This study is a continuation of previous investigations which focused on obtaining hydrate dissociation data for R134a, R410a and R507 refrigerants in NaCl and CaCl 2 aqueous solutions. The measured hydrate dissociation data can be used to design industrial wastewater treatment and desalination processes. The results show that the effect of salt concentration on hydrate formation is smaller for MgCl 2 aqueous solutions compared to CaCl 2 and NaCl as salt concentration increases. Modelling of the measured data is performed using a combination of the solid solution theory of van der Waals and Platteeuw, the Aasberg–Petersen et al. model, and the Peng–Robinson equation of state with classical mixing rules. The model is in good agreement with the measured hydrate dissociation data. [ABSTRACT FROM AUTHOR]

Published
2016
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