Publications by authors named "Nurul Noramelya Zulkefli"
In this work, the performance of anion exchange membrane (AEM) electrolysis is evaluated. A parametric study is conducted, focusing on the effects of various operating parameters on the AEM efficiency. The following parameters-potassium hydroxide (KOH electrolyte concentration (0.
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- An investigation assessed how different operating parameters and electrode types influence hydrogen gas production via electrolysis in a polymer electrolyte membrane (PEM) electrolyzer, focusing on various factors like current density, flow rate, and temperature.
- The optimal setup for efficient electrolysis was found to be a deionized water feed rate of 2 mL/min, a temperature of 70 °C, and using a 3.0 mg/cm IrRuOx anode catalyst, resulting in high voltaic efficiency (85%) and energy efficiency (67.5%).
- These findings indicate that carefully selecting operating parameters can significantly enhance the performance and reduce the costs of PEM electrolyzers.
Metal-based adsorbents with varying active phase loadings were synthesized to capture hydrogen sulfide (HS) from a biogas mimic system. The adsorption-desorption cycles were implemented to ascertain the HS captured. All prepared adsorbents were evaluated by nitrogen adsorption, Brunauer-Emmett-Teller surface area analysis, scanning electron microscopy-energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy.
View Article and Find Full Text PDFThis study reports on the synthesis of bi-metal compound (BMC) adsorbents based on commercial coconut activated carbon (CAC), surface-modified with metal acetate (ZnAc), metal oxide (ZnO), and the basic compounds potassium hydroxide (KOH) and sodium hydroxide (NaOH). The adsorbents were then characterized by scanning electron microscopy and elemental analysis, microporosity analysis through Brunauer-Emmett-Teller (BET) analysis, and thermal stability via thermogravimetric analysis. Adsorption-desorption test was conducted to determine the adsorption capacity of HS via 1 L adsorber and 1000 ppm HS balanced 49.
View Article and Find Full Text PDFThis study reports on the impregnation of bi-metallic adsorbents based on commercial coconut activated carbon (CAC), surface-modified with metal acetate (ZnAc), metal oxide (ZnO and TiO), and the basic compound potassium hydroxide (KOH). The morphology of the adsorbents was then characterized with SEM-EDX, the microporosity was determined using Brunauer-Emmett-Teller (BET) analysis, the thermal stability was investigated via thermogravity analysis (TGA), and functional group analysis was undertaken with Fourier-transform infrared (FTIR) spectroscopy. These modified adsorbents were subjected to a real adsorption test for HS capture using a 1 L adsorber with 5000 ppm HS balanced for N, with temperature and pressure maintained at an ambient condition.
View Article and Find Full Text PDFThis study focuses on the synthesis, characterization, and evaluation of the performance of core shell nanostructure adsorbent for hydrogen sulfide (HS) capture. Commercial coconut shell activated carbon (CAC) and commercial mixed gas of 5000 ppm HS balanced N were used. With different preparation techniques, the CAC was modified by core shell impregnation with zinc oxide (ZnO), titanium oxide (TiO), potassium hydroxide (KOH), and zinc acetate (ZnAC).
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- Adsorption technology offers innovative methods for biogas purification, focusing on the ability of adsorbents and operational conditions.
- A new adsorbent was developed using commercial coconut shell activated carbon (CAC) modified with various chemicals to enhance selective removal of H2S.
- The study evaluated the performance of these modified adsorbents in a real-time system, revealing that ZnAc2-CAC exhibited the highest H2S adsorption capacity.