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All Journal Distilat: Jurnal Teknologi Separasi
Manggada, Gumawa Windu
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Chemical Engineering, Chemistry & Bioengineering

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HIGH-ENERGY MILLING OF MAGNESIUM WITH ZEOLITE FOR HYDROGEN STORAGE Pratama, Adhira Satria; Manggada, Gumawa Windu; Elsayed, Magdy Abdelghany; Zhou, Shixue
DISTILAT: Jurnal Teknologi Separasi Vol. 10 No. 4 (2024): December 2024
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/distilat.v10i4.6651

Abstract

Magnesium has received great attention as a potential material for hydrogen storage due to its environmental friendliness, high gravimetric hydrogen storage capacity, and low cost. However, the material's effectiveness is limited by its high thermodynamic stability, which makes hydrogen desorption challenging, and low reaction kinetics, which slows the rate of hydrogen absorption and desorption. To enhance the performance of magnesium as a hydrogen storage material, this work innovatively aims to examine the impact of time and high energy milling speed on particle size as well as the milling aid effect of zeolite 5A. Experiment results showed that after ball milling with 4 h milling time and 270 r/min milling speed, the size of magnesium crystallites calculated from XRD data is in the range of 32.8-49.3 nm, while the size before ball milling was 72.7 nm. The kinetic measurement results showed that the Mg+10 wt.% zeolite 5A+10 wt.% Ni sample with 4 h milling time and 270 r/min milling speed at 330°C and 2.5 MPa had the best absorption and desorption capacity of 4.14 wt.% and 3.91 wt.%, respectively, in less than 25 min. The synergistic effect of milling time, milling speed, and the addition of zeolite 5A with Ni has a significant role in reducing the size of Mg particles, which affects the absorption and desorption performance of magnesium.
PHOSPHONIC ACID MODIFICATION TO MOLYBDENUM ATOM CATALYST FOR CO2 HYDROGENATION ON MAGNESIUM HYDRIDE SURFACE Manggada, Gumawa Windu; Zhou, Shixue
DISTILAT: Jurnal Teknologi Separasi Vol. 8 No. 2 (2022): June 2022
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/distilat.v8i2.383

Abstract

Catalytic hydrogenation is one of the most effective ways to convert CO2 to high value-added chemicals, and it is challenging to improve the catalytic activity and product selectivity based on the understanding of catalysis mechanism of the process. In this work, organic phosphonic acid was innovatively employed to tune single atom catalyst for CO2 hydrogenation to methanol, and the effect of fluoromethylphosphonic acid (FMPA) on the electronic structure of molybdenum and the reaction energy barriers of CO2 hydrogenation on MgH2 surface were investigated by density functional theory (DFT) calculations. The results showed that the reaction energy barriers at the key steps were significantly decreased by the introduction of FMPA, which stabilized the reaction intermediates from CO2 hydrogenation by reducing the electron density of molybdenum adsorption site with its oxygen atoms. The reverse water gas shift (RWGS) pathway was superior to formate pathway for CO2 hydrogenation on FMPA/Mo-MgH2(001) surface with energy barrier only 1.22 eV at the rate-determining step, and CH3OH was the overwhelming product rather than HCOOH, H2CO, CO or CH4 considering the reaction barriers and adsorption energies. The combination of organic phosphonic acid with single atom catalyst can generate the rational design of new catalytic system, which is helpful to control the reaction pathway and product selectivity.
Co-Authors Elsayed, Magdy Abdelghany Pratama, Adhira Satria Zhou, Shixue