Hydrogen adsorption capacity using modified nickel-kenaf core at different concentrations

In this study, surface chemistry modification of kenaf adsorbent in adsorptive hydrogen storage system was computationally investigated using Brunauer-Emmett-Teller (BET) surface area, thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), and elemental dispersion X-ray (EDX) analysis, in which the suitability of the adsorbent was determined with detailed physicochemical characterisation analysis. The method used for surface modification was metal deposition method using Ni(NO3)2 with various concentrations at different levels of pressure (up to 6 bars). Based on this research, modified kenaf with 0.4 M Ni(NO3)2 and 2.559 m2 g-1 adsorbed up to 1.013 mmol g-1 of hydrogen compared to the raw kenaf with only 0.396 mmol g-1 of hydrogen adsorbed in 5 h. Two consecutive cycles of adsorption were carried out to show the delivery performance of hydrogen adsorptive storage. Thus, different adsorption ability between the modified kenaf and raw kenaf shows that Ni-metal on kenaf surface assists in hydrogen adsorption process

Hydrogen adsorption capacity using modified nickel-kenaf core at different concentrations

In this study, surface chemistry modification of kenaf adsorbent in adsorptive hydrogen storage system was computationally investigated using Brunauer-Emmett-Teller (BET) surface area, thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), and elemental dispersion X-ray (EDX) analysis, in which the suitability of the adsorbent was determined with detailed physicochemical characterisation analysis. The method used for surface modification was metal deposition method using Ni(NO3)2 with various concentrations at different levels of pressure (up to 6 bars). Based on this research, modified kenaf with 0.4 M Ni(NO3)2 and 2.559 m2 g-1 adsorbed up to 1.013 mmol g-1 of hydrogen compared to the raw kenaf with only 0.396 mmol g-1 of hydrogen adsorbed in 5 h. Two consecutive cycles of adsorption were carried out to show the delivery performance of hydrogen adsorptive storage. Thus, different adsorption ability between the modified kenaf and raw kenaf shows that Ni-metal on kenaf surface assists in hydrogen adsorption process

Study of hydrogen adsorption onto kenaf sorbent surface by metal impregnation method

The potential of kenaf (Hibiscus cannabinus L.) as hydrogen materials was investigated. Kenaf core from National Kenaf and Tobacco Board (NKTB), Kelantan, Malaysia have been synthesized and characterized to achieve the improvement on kenaf's surface support, and then evaluated the hydrogen adsorption performance of the modified nickel-kenaf adsorbent (MK-Ni). Kenaf core have been transformed in particulate forms (size: 500 mm) for high performance adsorbents and impregnated into chemicals of Nickel Nitrate, Ni(NO3)2 in different concentrations. To improve the hydrogen adsorption, the surface was tailored using Formaldehyde (HCHO) and Potassium Hydroxide (KOH) before the process of metal impregnation. The modified kenaf and raw kenaf surface morphological structure were characterized by Variable-Pressure Scanning Electron Microscope (VPSEM) and the elements in kenaf sample was analyzed by using Energy Dispersive X-ray (EDX) spectroscopy. The hydrogen adsorption is compared with laboratory scale of hydrogen adsorption system by ultra-purity hydrogen gas (H2) in ambient temperature. Two cyclic operation for delivery performance of hydrogen shows that modified nickel-kenaf with 0.4 M concentration in 4 bar pressure bed had better improvement in hydrogen adsorption performance