Article Per Year (5 Year)
p-Index From 2021 - 2026
1.683
P-Index
This Author published in this journals
All Journal CHEMISTRY PROGRESS Jurnal Natur Indonesia The Indonesian Journal of Dental Research Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Communications in Science and Technology Chemistry Indonesian Journal of Chemical Research Molluca Journal of Chemistry Education (MJoCE) Jurnal Ilmu Pendidikan Indonesia Bulletin of Chemical Reaction Engineering & Catalysis
Karna Wijaya
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Gajah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Engineering Environmental Science Mathematics Physics

Published : 18 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 18 Documents
Search

 1   2 
Performance of Hydrothermally Prepared NiMo Dispersed on Sulfated Zirconia Nano-Catalyst in The Conversion of Used Palm Cooking Oil into Jet Fuel Range Bio-Hydrocarbons Wijaya, Karna; Saviola, Aldino Javier; Amin, Amalia Kurnia; Vebryana, Marini Fairuz; Bhagaskara, Adyatma; Ekawati, Hilda Anggita; Ramadhani, Saffana; Saputra, Dita Adi; Agustanhakri, Agustanhakri
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 2 Year 2024 (August 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20157

Abstract

Human efforts to overcome environmental problems from using fossil fuels continue, such as hydroconversion of biomass into bio-jet fuel. Research on producing a jet fuel range of bio-hydrocarbons from used palm cooking oil catalyzed by sulfated zirconia impregnated with nickel-molybdenum bimetal has been successfully conducted. The hydrothermal method synthesized the nano-catalyst material in the sulfation and impregnation processes. The hydroconversion process was carried out at atmospheric pressure and a temperature of 300–600 °C for 2 h with a hydrogen gas flow rate of 20 mL/min and a catalyst-to-feed ratio of 1:100 (wt%). Compared with zirconia and sulfated zirconia, NiMo-impregnated sulfated zirconia showed the best activity and selectivity in bio-jet fuel production with liquid product and selectivity of 61.07% and 43.49%, respectively. This catalyst also performed well in three consecutive runs, with bio-jet fuel selectivity in the second and third runs of 51.68% and 30.86%, respectively. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Dual metal NiMo dispersed on silica derived from rice husk ash as a catalyst for hydrocracking of used palm cooking oil into liquid biofuels Wijaya, Karna; Setyono, Risandrika Dwijayanti Putri; Pratika, Remi Ayu; Heraldy, Eddy; Suseno, Ahmad; Hakim, Lukman; Tahir, Iqmal; Oh, Won-Chun; Saviola, Aldino Javier
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1480

Abstract

The production of vegetable-based fuels has intensified in recent years due to the decreasing availability of fossil fuels and their environmental impacts. This study explores the synthesis, characterization, and application of nickel-molybdenum (NiMo) bimetal-dispersed silica catalysts for converting used palm cooking oil into liquid biofuels. The catalysts were synthesized using the wet impregnation method, incorporating Ni and Mo metals at concentrations of 1, 2, and 3% by weight of silica derived from rice husk ash. Impregnation of the silica with Ni and Mo metals increased its acidity, with the NiMo/SiO? 2 catalyst exhibiting the highest acidity value of 4.34 mmol/g. This catalyst also demonstrated the largest specific surface area and total pore volume, measured at 205.51 m²/g and 0.88 cm³/g, respectively. Hydrocracking of used palm cooking oil into liquid biofuels was performed at an optimum temperature of 450 °C with catalyst-to-feed weight ratios of 1:100, 2:100, and 3:100 for 1 h by hydrogen gas supply of 20 mL/min. Catalyst activity tests revealed the highest mass percentage of liquid product, 23.3%, at a ratio of 1:100 (w/w), with a biofuel yield of 20.34%, comprising 14.20% gasoline and 6.14% diesel. By utilizing biomass waste as both a catalyst and feedstock, this study presents a sustainable approach to reducing the carbon footprint and promoting environmental balance.
Fixing cobalt metal onto mordenite through spray impregnation and its evaluation as a catalyst in transforming used coconut cooking oil into bio-jet fuel Saviola, Aldino Javier; Wijaya, Karna; Syoufian, Akhmad; Vebryana, Marini Fairuz; Anggraeni, Widuri; Rozana, Kharistya; Darsono, Nono; Saputra, Dita Adi; Saputri, Wahyu Dita
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1535

Abstract

Given the challenges posed by fossil-based jet fuel, research into bio-jet fuel production has intensified to achieve carbon neutrality. The present work reports a significant breakthrough with the successful conversion of used coconut cooking oil into bio-jet fuel utilizing a cobalt-impregnated mordenite catalyst. Cobalt was introduced to mordenite via the spray impregnation method at a concentration of 2% using a CoCl?·6H?O solution. The resultant catalyst was characterized using FTIR, XRD, NH?-TPD, SAA, FESEM-EDX Mapping, TEM, XPS, and TG/DTA instruments. Hydrotreatment was conducted in a semi-batch reactor at atmospheric pressure, employing H? gas at a flow rate of 20 mL/min and a catalyst-to-feed ratio of 1:200 (w/w) for a duration of 2 h. The addition of cobalt significantly enhanced the efficiency of the hydrotreatment by improving the catalytic performance of mordenite as a support material. The liquid product conversion and total bio-jet fuel yield obtained from the hydrotreatment of used coconut cooking oil using the Co/mordenite catalyst were 60.25% and 51.11%, respectively. The highest selectivity for bio-jet fuel was observed in fraction II (450–550 °C) at 88.90%. This catalyst exhibited sustained performance over three consecutive runs, indicating its potential application in the future biofuel industry. Altogether, this research reveals the possibility of employing used coconut cooking oil as a sustainable and promising feedstock to be converted into bio-jet fuel by hydrodeoxygenation and/or hydrocracking reactions.
Sonochemically Modified Lapindo Mud Using Sulfuric Acid for Efficient Adsorption of Phenol in Aqueous Media and Real Wastewater Samples Wijaya, Karna; Bhagaskara, Adyatma; Sani, Maria Francia Mirabella; Vebryana, Marini Fairuz; Pratama, Fernando Alvaro; Anggraeni, Widuri; Amin, Amalia Kurnia; Ramadhani, Faturrahman Al; Saviola, Aldino Javier
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 4 Year 2024 (December 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20228

Abstract

Pharmaceutical industrial wastewater frequently contains high amounts of phenolic substances, which pose severe threats to the ecosystem and human health. Therefore, efficient removal of these pollutants is urgently needed. In the present work, sulfated Lapindo mud (SLM) was prepared using the sonochemical method and applied as an adsorbent for phenol removal in aqueous media and actual wastewater samples from Code River, Yogyakarta. Modification of Lapindo mud (LM) using sulfuric acid enables it to remove its impurities, resulting in a material containing 78.4% silica (SiO2) and 15.3% alumina (Al2O3). The SLM adsorbent demonstrated sufficient adsorption performance of 49.8% with an optimal initial phenol concentration of 120 mg/L with a contact time of 100 min at pH of 10. The maximum adsorption capacity (qmax) obtained by the Langmuir isotherm model was 27.2 mg/g. The adsorption process follows pseudo-second-order because it has two active sites, Brønsted acid sites (–SiOH and –SO3H) and Lewis acid sites (Si4+). Phenol in base condition undergoes a deprotonation reaction that is stabilized by the acid-active sites of the SLM adsorbent through intermolecular forces. Considering the large adsorption capacity and quick kinetic, the SLM adsorbent can be a promising cheap and green material to remove phenolic substances in wastewater, especially in the river near the medical facility. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
The Effect of Ni/AC and Mo/AC Catalyst Arrangements on the Activity and Selectivity for Hydrotreating Palm Cooking Oil into Biojet Fuel Trisunaryanti, Wega; Wijaya, Karna; Saputro, Muhammad Darul Ikhsan
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99071

Abstract

This research was done to study the effect of the arrangement of nickel (Ni) and molybdenum (Mo) metals impregnated with activated carbon on the activity and selectivity of the hydrodeoxygenation (HDO) of palm cooking oil into biojet fuel. The catalysts were synthesized by impregnating Ni and Mo metals by dry spray impregnation method with precursor salts nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) and ammonium heptamolybdate tetrahydrate ((NH4)6Mo7O24·4H2O) solutions, respectively on the activated carbon. The catalysts were characterized using FTIR, XRD, SAA, SEM-EDX, and NH3-TPD instruments. The catalyst performance was tested using a semi-batch reactor with dual heaters in a one-pot system, atmospheric pressure, and a hydrogen gas flow rate of 20 mL min−1 for the palm cooking oil HDO reaction for 3 h. The obtained liquid products were analyzed using gas chromatography-mass spectrometry (GC-MS). The best catalyst arrangement was the Ni/AC catalyst in a double-layer arrangement, which had 6.25 wt.% metal content, and a surface area of 803.89 m2 g−1 which resulted in 24.75 wt.% yield with 86.93% (fraction 1) and 87.48% (fraction 2) selectivity. This research concluded that catalyst layer arrangement affects the catalytic activity and selectivity in the HDO of palm cooking oil.
PROVISION OF CINNAMON BARK ETHANOL EXTRACT (Cinnamomum burmanii Blume) LOWER BLOOD SUGAR LEVELS HYPERGLYCEMIC WISTAR RATS A, Bawa Putra, A.; P, SutirtaYasa, I W.; I. B, Putra Manuaba,; M, Siaka, I; M., Bakta, I; M, Jawi, I; Wijaya, Karna; I M, Oka Adi Parwata, Parwata,; M, Sukadana, I
Jurnal Ilmu Pendidikan Indonesia Vol 10 No 1 (2022)
Publisher : Master of Science Education Program, Postgraduate Program of Cenderawasih University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (541.469 KB) | DOI: 10.31957/jipi.v10i1.1933

Abstract

Cinnamon plant (Cinnamomum burmanii Blume) is a tall plant that contains secondary metabolites and is widely consumed by the community for generations which is used as a medicinal ingredient. The part of the cinnamon plant that is widely used by the community is the bark. Cinnamon bark extraction was carried out by maceration method in 96% ethanol followed by evaporation until a thick extract was formed. Furthermore, characterization was carried out and applied to hyperglycemic wistar rats by observing the decrease in blood sugar levels. The results showed that the moisture content was 9.62% and the yield was 14.74% and the phytochemical test showed that the cinnamon bark extract was positive for polyphenols and flavonoids. Cinnamon bark extract was able to reduce blood sugar levels of hyperglycemic wistar rats to reach normal which was observed from the third day after being injected with alloxan until the seventeenth day.
EFFECT OF SOAKING AND HYDROLYSIS TIME VARIATIONS ON GELATIN CHARACTERISTICS FROM COW BONES Pattiasina, Priska Marisa; Trisunaryanti, Wega; Wijaya, Karna
Molluca Journal of Chemistry Education (MJoCE) Vol 15 No 1 (2025): MJoCe
Publisher : Program Studi Pendidikan Kimia, FKIP, Universitas Pattimura (Chemistry Education Study Program, Faculty of Teacher Training and Educational Sciences, Pattimura University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/MJoCEvol15iss1pp27-33

Abstract

Gelatin extraction from cow bones has been conducted with variations in both acid and alkaline soaking. The gelatin extraction process from cow bones consists of two steps: soaking the cow bones and collagen hydrolysis. During the soaking step, continuous soaking was performed, beginning with soaking in a 4% NaOH alkaline solution, followed by acid soaking using a 1.2% citric acid solution, and further acid soaking with 4% HCl, with variations in soaking times of 1 hour, 12 hours, and 24 hours. The soaked cow bones were then hydrolyzed at temperatures of 60°C and 80°C for 5 hours. The resulting gelatin was characterized using FTIR and SDS-PAGE techniques. The best-characterized gelatin, with a band thickness in the molecular weight range of about 120 kDa, confirmed as the α chain, was obtained from soaking for 24 hours and hydrolyzing at 80°C.
A Green and Sustainable Approach for Converting Laboratory Latex Glove Waste into Liquid Fuel via Microwave-assisted Pyrolysis Wangsa, Wangsa; Saviola, Aldino Javier; Hauli, Latifah; Trisunaryanti, Wega; Chandra, Patrik; Fitria, Riska Astin; Mahayuwati, Puspa Nindro; Wijaya, Karna
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 3 Year 2025 (October 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20429

Abstract

The extensive use of chemical laboratories for experimental and research activities has resulted in the substantial accumulation of latex glove waste, a widely used form of personal protective equipment (PPE). This study presents a novel and sustainable approach for converting laboratory latex glove waste into liquid fuel using microwave-assisted pyrolysis (MAP), which aligns with the principles of green chemistry. Under optimal conditions, including a microwave power of 800 W and an irradiation time of 30 min, the process achieved a liquid product yield of 52.58 wt%, with 41.86 wt% consisting of gasoline-range hydrocarbons (C₅–C₁₂). The primary compound identified in the liquid product was D-limonene (C₁₀H₁₆), a valuable monocyclic terpene. Compared to conventional pyrolysis conducted in a semi-batch reactor, the MAP process exhibited superior performance in terms of liquid yield, gasoline-range hydrocarbon content, total hydrocarbon composition, and calorific value. This innovative waste-to-fuel conversion method demonstrates the strong potential of MAP as an efficient and environmentally responsible strategy for waste valorization and resource recovery. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors A, Bawa Putra, A. Ady Mara, Ady Agustanhakri, Agustanhakri Ahmad Suseno Akhmad Syoufian Amin, Amalia Kurnia Andrian Saputra Anggraeni, Widuri Bhagaskara, Adyatma Budiyansah, Amsal Chandra, Patrik Dwi Julian Sugianto, Dwi Julian Dyah Irnawati Eddy Heraldy Ekawati, Hilda Anggita Fitria, Riska Astin Hauli, Latifah I M, Oka Adi Parwata, Parwata, I Wayan Sutapa I. B, Putra Manuaba, Indriana Kartini Iqmal Tahir Luh Putu Ratna Sundari Lukman Hakim M, Jawi, I M, Siaka, I M, Sukadana, I M., Bakta, I Mahayuwati, Puspa Nindro Mohd Noor Ahmad Nono Darsono, Nono Oh, Won-Chun P, SutirtaYasa, I W. Pattiasina, Priska Marisa Pratama, Fernando Alvaro Rahayu, Endah Fitriani Ramadhani, Faturrahman Al Ramadhani, Saffana Remi Ayu Pratika Ria Amunanto Ria Armunanto Rodiansono Rozana, Kharistya Sani, Maria Francia Mirabella Saputra, Dita Adi Saputro, Muhammad Darul Ikhsan Saviola, Aldino Javier Sekewael, Serly J. Setyono, Risandrika Dwijayanti Putri Suryo Purwono Tazkia, Aulia Meylida Triyono Triyono . Vebryana, Marini Fairuz W. Widjijono Wahyu Dita Saputri Wangsa, Wangsa Wega Trisunaryanti Widya Asmara