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All Journal VALENSI Seminar Nasional Teknik Kimia Kejuangan International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Dwiatmoko, Adid Adep
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science

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Journal : international journal of renewable energy development

 1 
Effect of various silica-supported nickel catalyst on the production of bio-hydrocarbons from oleic acid Riyandi, Rafly; Rinaldi, Nino; Yunarti, Rika Tri; Dwiatmoko, Adid Adep; Simanjuntak, Fidelis Stefanus Hubertson
International Journal of Renewable Energy Development Vol 13, No 4 (2024): July 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60054

Abstract

The conversion of fatty acids into bio-hydrocarbons can be carried out through a deoxygenation (DO) reaction. Catalytic deoxygenation of fatty acids can occur through three reaction pathways: decarbonylation, decarboxylation, and hydrodeoxygenation. In this study, three kinds of silica were prepared: (i) silica obtained from the rice husk ash (RHA); (ii) synthetic mesoporous silica SBA-16; and (iii) commercial silica. All prepared silica was used as supported nickel (Ni) catalyst for bio-hydrocarbon production through DO reaction of oleic acid. The objective of this study was to investigate the effect of variations of silica on the reaction pathway and final products composition of DO reaction of oleic acid. The catalysts were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), surface area analysis, and NH3-temperature-programme desorption. Based on XRF and XRD analysis results, it can be concluded that nickel was successfully impregnated into all silica. All samples of catalysts were used in a reaction carried out at temperature of 285 °C under a pressure of 40 bar H2 for 2h. The results showed that all catalysts were able to convert oleic acid to bio-hydrocarbon with differences in products composition. The highest oleic acid conversion of 98.25% was achieved with Ni/RHA catalyst but the obtained liquid products was the lowest among other catalysts. It is found that this phenomenon was closely related to the acidity properties of the catalyst.
The effect of temperature during the hydrocracking of low-density polyethylene using a Ni-Cu/HZSM-5 catalyst Maulida, Suhailah Salma; Kadarwati, Sri; Dwiatmoko, Adid Adep; Agustian, Egi
International Journal of Renewable Energy Development Vol 15, No 4 (2026): July 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61922

Abstract

LDPE plastics contributed 20-30% of the plastics use. Due to its non-biodegradable properties, plastic waste management is crucial. In the other hand, the LDPE plastics provide potential and benefits in the exploration of energy resources; they could be converted to liquid fuels through a catalytic hydrocracking. This study focuses on the effect of temperatures during the hydrocracking of LDPE using a Ni-Cu/HZSM-5 catalyst. The Ni-Cu/HZSM-5 catalyst was synthesized using the wet impregnation method assisted by an ultrasonic irradiation. The characteristics of the catalyst were evaluated prior to its use during the hydrocracking of LDPE. This study showed that the impregnation of Ni and Cu at HZSM-5 surface did not significantly affect the crystallinity of HZSM-5. Even though the peaks of Ni and Cu in the diffraction pattern were not clearly observed, their presence at HZSM-5 surface was well confirmed by the XRF spectrum. In addition, the hierarchical structure of HZSM-5 was also confirmed by the appearance of microporosity together with the type-IV hysteresis loop on the nitrogen adsorption-desorption isotherm. A considerable decrease (~25%) of the catalyst acidity was observed after the impregnation of Ni and Cu at HZSM-5 surface. The Ni-Cu/HZSM-5 catalyst showed a good activity during the hydrocracking of LDPE at temperatures of 275−400 °C, resulting in liquid, solid, and gaseous products. The yields of the liquid product increased by increasing the hydrocracking temperatures. It was observed that by increasing the hydrocracking temperatures, the yield of the kerosene and diesel fractions decreased, while the yield of the gasoline fraction increased, as supported by the density and calorific value that was close to the commercial gasoline. A further temperature increase would lead to more products with lighter fractions, reducing the yield of gasoline. This was also supported by the presence of alkenes, ketones, and esters formed after the catalytic hydrocracking as shown by the FTIR spectra of the liquid products.
Co-Authors Anna Muawanah Egi Agustian Isalmi Aziz Joni Prasetyo, Joni Kurniati, Sayekti Lisa Adhani Maharani, Najiah Sephia Maulida, Suhailah Salma Muhammad Farhan Muhammad Mufti Azis Nabillah, Syifa H. Nanda Saridewi, Nanda Nino Rinaldi Novia Dwi Rahmawati Noviyan Darmawan Purwantiningsih Sugita Riyandi, Rafly Simanjuntak, Fidelis Stefanus Hubertson Simanungkalit, Sabar P. Siregar, Yusraini D. I. Siti Nurbayti Sri Kadarwati Widjaya, Robert Ronal Yati Maryati yati, indri Yulyani Nur Azizah Yunarti, Rika Tri