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All Journal CHEMISTRY PROGRESS Jurnal Penelitian Hasil Hutan Alchemy Jurnal Penelitian Kimia Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Communications in Science and Technology CORD Molluca Journal of Chemistry Education (MJoCE) Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
Wega Trisunaryanti
Jurusan Kimia MIPA Universitas Gadjah Mada, Yogyakarta
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology

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Journal : Communications in Science and Technology

 1 
Study of green reductant effects of highly reduced graphene oxide production and their characteristics Chasanah, Uswatul; Trisunaryanti, Wega; Triyono; Oktaviano, Haryo Satriya; Santoso, Iman; Fatmawati, Dyah Ayu
Communications in Science and Technology Vol 7 No 2 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.2.2022.906

Abstract

The study of the green reductant effects to produce reduced graphene oxide (rGO) has been completed successfully. The reduction of graphene oxide (GO) was carried out chemically using various reductants such as ascorbic acid (rGO-AA), gallic acid (rGO-AG), and trisodium citrate (rGO-NS). The GO was prepared using the Tour method at a temperature of 65 ? for 6 hours with potassium permanganate: graphite weight ratio 1:3.5. The results showed that rGO-AA had the highest electrical conductivity value of 755.70 S/m, with characteristics such as a surface area of 255.93 m2/g, a pore volume of 0.61 cm3/g, an average pore diameter of 7.10 nm, ID/IG ratio of 1.93, and three graphene layers in the material nanostructure stack. Therefore, it can be concluded that the reduction of GO with ascorbic acid (rGO-AA) is the most effective in producing rGO.
Preparation of Mo-impregnated mordenite catalysts for the conversion of refined kernel palm oil into bioavtur Trisunaryanti, Wega; Triyono; Wijaya, Karna; Kartini, Indriana; Purwono, Suryo; Rodiansono; Mara, Ady; Budiyansah, Amsal
Communications in Science and Technology Vol 8 No 2 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.2.2023.1288

Abstract

The research aims to study the effects of Mo metal embedded on H-Mordenite on its activity and selectivity of hydrodeoxygenation (HDO) for Refined Palm Kernel Oil (RPKO) into bioavtur. The RPKO was obtained from the results of degumming and bleaching process of palm kernel oil and then analyzed using Gas Chromatography-Mass Spectrometer (GC-MS). The impregnation of Mo metal was carried out by spraying using an ammonium heptamolybdate precursor solution ((NH4)6Mo7O24•4H2O) with an initial Mo metal content of 5, 10, and 15wt% of H-Mordenite to produce 5-Mo/Mor, 10-Mo/Mor, and 15-Mo/Mor. The 15-Mo/Mor catalyst produced the highest amount of liquid product (46.08wt%) with bioavtur yield of 43.19wt%. The usability test showed that 15-Mo/Mor catalyst still produced a good performance after three times of use in the RPKO feed HDO with the second and third run test liquid product of 34.82 and 46.14wt% respectively with bioavtur yield of 32.58 and 43.45wt%, respectively.
Preparation of Ni/ZSM-5 and Mo/ZSM-5 catalysts for hydrotreating palm oil into biojet fuel Trisunaryanti, Wega; Wijaya, Karna; Tazkia, Aulia Meylida
Communications in Science and Technology Vol 9 No 1 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.1.2024.1442

Abstract

With the increasing demand for fuel for global usage and CO2 emissions, greener alternatives are needed, especially in biojet fuel production. Catalyst preparation involves the impregnation of Ni and Mo metals into H-ZSM-5 using a dry impregnation method with spray deposition, resulting in Ni/ZSM-5 and Mo/ZSM-5 catalysts. Catalyst characterization utilizes FT-IR, XRD, SAA, SEM-EDX, XRF, and NH3-TPD instruments. The activity and selectivity tests of the catalysts were conducted in the hydrotreating of palm oil using Ni/ZSM-5 monolayer, Ni/ZSM-5 bilayer, Mo/ZSM-5 monolayer, Mo/ZSM-5 bilayer, as well as Ni/ZSM-5 bottom-layer and Mo/ZSM-5 top-layer arrangements. The result showed double-layer Ni/ZSM-5 as the best catalyst in activity and selectivity in producing biojet fuel fractions with consecutive conversion, selectivity, and yield of 29.71%, 84.76%, and 24.34%, respectively. The layers of catalyst affected the catalytic activity and selectivity, resulting in a higher yield.
Synthesis, characterization and performance of Ni/mesoporous silica - NH\(_2\)/mesoporous silica and Ni-NH\(_2\)/mesoporous silica as bifunctional catalyst in one step conversion of waste palm oil to biodiesel Fitria, Anissa; Trisunaryanti, Wega; Triyono; Santoso, Iman
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.9.2.2024.1483

Abstract

Sidoarjo mud is a natural material resulted from an unusual natural phenomenon and is rich in silica contents. So far, no studies have been reported about mesoporous silica from Sidoarjo Mud, which is a supported catalyst for one-step conversion to biodiesel. This study aims to explore synthesis, characterization, and applications to demonstrate the heightened activity and selectivity in the esterification- transesterification of waste palm oil into biodiesel, utilizing a one-step method aligned with the principles of green chemistry using two bifunctional catalysts (Ni/MS - NH2/MS and Ni-NH2/MS). The bifunctional catalysts were prepared by means of hydrothermal, wet impregnation, and grafting methods. The highest biodiesel yield (78.77%) was achieved under the condition of 65 °C, 3 h, methanol to oil ratio 21 : 1, and 3wt% of Ni/MS - NH2/MS as the catalyst. The catalyst was able to yield a conversion level as good as ~72% in the 3rd cycle after regeneration. The research demonstrates the industrial relevance of the catalyst, offering a sustainable solution for biodiesel production and waste management.
High-performance eco-friendly Ni Cu/bamboo activated carbon catalysts for oxidative desulfurization of high-concentration DBT Haerani, St.; Trisunaryanti, Wega; Triyono; Santoso, Imam; Purbonegoro, Jason; Wangsa
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1702

Abstract

This study investigated how the metal impregnation method affects the oxidative desulfurization (ODS) of dibenzothiophene (DBT) using H2O2 over Ni–Cu catalysts supported on bamboo-derived activated carbon. Catalysts with 1% and 2% Ni–Cu were prepared via simultaneous impregnation, while the effect of sequence was evaluated by comparing simultaneous and sequential impregnation (2%Ni-2%Cu/AC and 2%Cu-2%Ni/AC). The 2%Ni-2%Cu/AC catalyst was identified as the best catalyst, with a surface area of 802.36 m2/g, average pore diameter of 2.4761 nm, and total acidity of 3.1239 mmol/g. This catalyst achieved the highest DBT reduction of 90.81% under optimal conditions (0.2 g catalyst weight, 60 minutes, 40 °C, and 0.66 mL H2O2), confirming that the sequential impregnation route significantly enhances catalytic performance. In conclusion, the impregnation sequence in designing highly efficient desulfurization catalysts is important due to spray impregnation resulting in higher surface area, acidity, and catalytic activity compared to the simultaneous impregnation method.
Co-Authors Abd. Rasyid Syamsuri Ady Mara, Ady Aminuyati Bambang Setiaji Budiyansah, Amsal Chairil Anwar Chandra, Patrik Dian Maruto Widjonarko Endang Tri Wahyuni Fatmawati, Dyah Ayu Fitria, Anissa Fitria, Riska Astin Haryo Satriya Oktaviano Hauli, Latifah I F Nurcahyo, I F I. D. K. Anom Imam Santoso Indriana Kartini Karna Wijaya Kartini, Indriyana Khoirina Dwi Nugrahaningtyas Lisna Efiyanti Mahayuwati, Puspa Nindro Meytij Jeanne Rampe Nugraheni, Ika Kusuma Nuryati Nuryati Nuryono Nuryono Pattiasina, Priska Marisa Persada, Anggun Angkasa Bela Purbonegoro, Jason Rahayu, Endah Fitriani Rodiansono Rodiansono Rodiansono Saputro, Muhammad Darul Ikhsan Saviola, Aldino Javier Siti Salamah St. Haerani, St. Suryo Purwono Tazkia, Aulia Meylida Triyono Triyono . Triyono Triyono Uswatul Chasanah, Uswatul Wangsa Wangsa, Wangsa