| Email : akhmadsyoufian@ugm.ac.id |
| Education Background : |
| Doctor, Ph.D, Energy and Materials Science, Saga University, Japan, 2007 Undergraduate, S.Si, Kimia, Universitas Gadjah Mada, 2002 |
| Research Interest : |
| Semikonduktor dan Fotokatalisis, Kimia Fisik (Termasuk Struktur), Sintesis Bahan/ Makromolekuler dan Kimia Material. Aktif meneliti tentang fotoreaksi dalam sistem nano semikonduktor, modifikasi struktur fotokatalis semikonduktor, serta sintesis fotokatalis semikonduktor responsif pada daerah sinar tampak. |
| Research Cluster/Group : |
| Material, Katalis |
| List of Publications : |
|
(1) Saviola, A. J.; Syoufian, A.; Oh, W. C.; Wijaya, K. Atmospheric Hydrotreatment of Used Palm Cooking Oil over Nickel-Dispersed Phosphated Zirconia as Highly Stable Nano-Catalyst for Bio-Jet Fuel Production. Inorg. Chem. Commun. 2025, 173. https://doi.org/10.1016/j.inoche.2024.113790. (2) Lestari, D. Y.; Wijaya, K.; Syoufian, A.; Hariani, P. L.; Utami, M.; Saviola, A. J.; Fitria, R. A.; Wahyuningsih, P.; Bhagaskara, A.; Wangsa, W.; Chang, S. W.; Ravindran, B. Unveiling the Potency of Graphene-Based Materials for Water Remediation: A Brief Review. J. Mol. Struct. 2025, 1335. https://doi.org/10.1016/j.molstruc.2025.142018. (3) Lestari, D. Y.; Syoufian, A.; Hariani, P. L.; Amin, A. K.; Oh, W. C.; Saviola, A. J.; Wijaya, K. Biogenic Synthesis of Silver Nanoparticles/Reduced Graphene Oxide (AgNPs/RGO) Mediated Nephelium Lappaceum Leaf Extract as an Effective Solid Acid Catalyst for Liquid-Phase Benzene Nitration. Results Chem. 2025, 13. https://doi.org/10.1016/j.rechem.2024.102014. (4) Kunarti, E. S.; Agustiningsih, D.; Pambudi, F. I.; Syoufian, A.; Santosa, S. J. Enhanced Photocatalytic Activity and Magnetic Properties of CoFe2O4/TiO2-Ag/S for Visible Light-Driven Photodegradation of Methylene Blue. Indones. J. Chem. 2025, 25 (1), 232–243. https://doi.org/10.22146/ijc.100142. (5) Sholichah, E.; Purwono, B.; Murdiati, A.; Syoufian, A.; Afifah, N.; Sarifudin, A. A Novel Method for Extracting Glucomannan Using an Aqueous Two-Phase System. Food Technol. Biotechnol. 2025, 63 (1), 14–25. https://doi.org/10.17113/ftb.63.01.25.8583. (6) Lestari, D. Y.; Syoufian, A.; Hariani, P. L.; Saviola, A. J.; Oh, W. C.; Amin, A. K.; Pratika, R. A.; Wijaya, K. Facile Green Synthesis of Silver Nanoparticles Decorated on Sulfonated Graphene Oxide by Rambutan (Nephelium Lappaceum) Leaf Extract and Application as a Catalyst for Converting Benzene into Nitrobenzene. Results Eng. 2025, 25. https://doi.org/10.1016/j.rineng.2025.104321. (7) Fitria, R. A.; Prasetyo, N.; Saviola, A. J.; Trisunaryanti, W.; Syoufian, A.; Amin, A. K.; Oh, W. C.; Wijaya, K. Synthesis of Cobalt-Dispersed Sulfated Zirconia Nanocatalyst for the Hydroconversion of Used Palm Cooking Oil into Bio-Jet Fuel. Case Stud. Chem. Environ. Eng. 2025, 11. https://doi.org/10.1016/j.cscee.2024.101052. (8) Saviola, A. J.; Vebryana, M. F.; Wangsa, W.; Prastyo, P.; Syoufian, A.; Saputra, D. A.; Timuda, G. E.; Hauli, L.; Oh, W. C.; Wijaya, K. Performance Comparison of Molybdenum-Impregnated Sulfated Mesoporous Silica Catalysts by Spray and Wet Impregnation in Transforming Used Palm Cooking Oil into Bio-Jet Fuel. Chem. Africa 2025. https://doi.org/10.1007/s42250-025-01229-9. (9) Fauzi, W. P.; Kurniawan, R.; Sudiono, S.; Prasetyo, N.; Syoufian, A. Photodegradation of Phenol under Visible Light Irradiation Using Cu-N-Codoped ZrTiO4 Composite as a High-Performance Photocatalyst. Indones. J. Chem. 2024, 24 (2), 519–529. https://doi.org/10.22146/ijc.90365. (10) Syoufian, A.; Kurniawan, R. Codoping of Nickel and Nitrogen in ZrO2-TiO2 Composite as Photocatalyst for Methylene Blue Degradation under Visible Light Irradiation. Indones. J. Chem. 2024, 24 (4), 1218–1227. https://doi.org/10.22146/ijc.90151. (11) Alifi, A.; Saviola, A. J.; Wijaya, K.; Syoufian, A.; Prasetyo, N.; Wahyuningsih, P.; Fitria, R. A.; Hauli, L.; Amin, A. K.; Oh, W. C. Preparation and Catalytic Evaluation of Phosphated Zirconia Nanopowder for Ethanol Dehydration into Diethyl Ether. J. Indian Chem. Soc. 2024, 101 (8). https://doi.org/10.1016/j.jics.2024.101204. (12) Saviola, A. J.; Wijaya, K.; Syoufian, A.; Saputri, W. D.; Saputra, D. A.; Aziz, I. T. A.; Oh, W. C. Hydroconversion of Used Palm Cooking Oil into Bio-Jet Fuel over Phosphoric Acid-Modified Nano-Zirconia Catalyst. Case Stud. Chem. Environ. Eng. 2024, 9. https://doi.org/10.1016/j.cscee.2024.100653. (13) Saviola, A. J.; Wijaya, K.; Syoufian, A.; Vebryana, M. F.; Anggraeni, W.; Rozana, K.; Darsono, N.; Saputra, D. A.; Saputri, W. D. Fixing Cobalt Metal onto Mordenite through Spray Impregnation and Its Evaluation as a Catalyst in Transforming Used Coconut Cooking Oil into Biojet Fuel. Commun. Sci. Technol. 2024, 9 (2), 356–365. https://doi.org/10.21924/cst.9.2.2024.1535. (14) Alisha, G. D.; Trisunaryanti, W.; Syoufian, A.; Larasati, S. Synthesis of High Stability Mo/SiO2 Catalyst Utilizing Parangtritis Beach Sand for Hydrocracking Waste Palm Oil into Biofuel. Biomass Convers. Biorefinery 2023, 13 (12), 11041–11055. https://doi.org/10.1007/s13399-021-02064-x. (15) Syoufian, A.; Kurniawan, R. Visible-Light-Induced Photodegradation of Methylene Blue Using Mn,N-Codoped ZrTiO4 as Photocatalyst. Indones. J. Chem. 2023, 23 (3), 661–670. https://doi.org/10.22146/ijc.79261. (16) Wijaya, K.; Annisa, R. N.; Setyopratiwi, A.; Syoufian, A.; Hasanudin, H.; Utami, M. Hydrocracking of Palm Oil Into Biofuel Over Ni-Al2O3-Bentonite (Aluminosilicate) Nanocatalyst. In Sustainability Engineering: Challenges, Technologies, and Applications; CRC Press: Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, Indonesia, 2023; pp 61–82. https://doi.org/10.1201/9781003167693-2. (17) Rahmawati, L.; Kurniawan, R.; Prasetyo, N.; Sudiono, S.; Syoufian, A. Copper-and-Nitrogen-Codoped Zirconium Titanate (Cu-N-ZrTiO4) as a Photocatalyst for Photo-Degradation of Methylene Blue under Visible-Light Irradiation. Indones. J. Chem. 2023, 23 (2), 416–424. https://doi.org/10.22146/ijc.78908. (18) Agipa, A. I.; Saputri, W. D.; Syoufian, A.; Sudiono, S.; Budiman, A.; Lestari, M. F.; Hauli, L.; Wijaya, K. Modification of Nanozirconia with Sulfuric Acid and Calcium Oxide as Heterogeneous Catalysts for Biodiesel Production from Used Coconut Cooking Oil. Moroccan J. Chem. 2023, 11 (3), 854–870. https://doi.org/10.48317/IMIST.PRSM/morjchem-v11i3.40434. (19) Aneu, A.; Wijaya, K.; Syoufian, A. Porous Silica Modification with Sulfuric Acids and Potassium Fluorides as Catalysts for Biodiesel Conversion from Waste Cooking Oils. J. Porous Mater. 2022, 29 (5), 1321–1335. https://doi.org/10.1007/s10934-022-01258-6. (20) Cipta, I.; Febiyanto, F.; Syoufian, A.; Kartini, I. Identification and Characterization of Nanoclays in Gamalama Volcanic Soil of Northern Maluku. Clays Clay Miner. 2022, 70 (3), 438–449. https://doi.org/10.1007/s42860-022-00190-9. (21) Setyaningsih, S.; Utami, M.; Syoufian, A.; Heraldy, E.; Yuwono, N. W.; Wijaya, K. Synthesis of SO42– /ZrO2 Solid Acid and Na2O/ZrO2 Solid Base Catalysts Using Hydrothermal Method for Biodiesel Production from Low-Grade Crude Palm Oil. Indones. J. Chem. 2022, 22 (1), 17–34. https://doi.org/10.22146/ijc.65404. (22) Sari, E. P.; Wijaya, K.; Trisunaryanti, W.; Syoufian, A.; Hasanudin, H.; Saputri, W. D. The Effective Combination of Zirconia Superacid and Zirconia-Impregnated CaO in Biodiesel Manufacturing: Utilization of Used Coconut Cooking Oil (UCCO). Int. J. Energy Environ. Eng. 2022, 13 (3), 967–978. https://doi.org/10.1007/s40095-021-00439-4. (23) Alisha, G. D.; Trisunaryanti, W.; Syoufian, A. Hydrocracking of Waste Palm Cooking Oil into Hydrocarbon Compounds over Mo Catalyst Impregnated on SBA-15. Silicon 2022, 14 (5), 2309–2315. https://doi.org/10.1007/s12633-021-01035-1. (24) Aziz, I. T. A.; Saputri, W. D.; Trisunaryanti, W.; Sudiono, S.; Syoufian, A.; Budiman, A.; Wijaya, K. Synthesis of Nickel-Loaded Sulfated Zirconia Catalyst and Its Application for Converting Used Palm Cooking Oil to Gasoline via Hydrocracking Process. Period. Polytech. Chem. Eng. 2022, 66 (1), 101–113. https://doi.org/10.3311/PPch.18209. (25) Wahyuni, E. T.; Mochammad, R. S.; Mahira, N. S.; Lestari, N. D.; Syoufian, A.; Nasir, T. A. Enhancement of TiO2 Activity under Visible Light by Doping S Element from Sulfur Core for Pb(II) Photo-Oxidation. React. Kinet. Mech. Catal. 2022, 135 (5), 2783–2796. https://doi.org/10.1007/s11144-022-02268-w. (26) Utami, M.; Wicaksono, S. H.; Syoufian, A.; Wijaya, K. Optimized Diethanolamide Surfactant Production from Waste Cooking Oil Using K2CO3/Zeolite Catalyst. In AIP Conference Proceedings; American Institute of Physics Inc.: Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Yogyakarta, 55584, Indonesia, 2022; Vol. 2645. https://doi.org/10.1063/5.0113105. (27) Alisha, G. D.; Trisunaryanti, W.; Syoufian, A. Mesoporous Silica from Parangtritis Beach Sand Templated by CTAB as a Support of Mo Metal as a Catalyst for Hydrocracking of Waste Palm Cooking Oil into Biofuel. Waste and Biomass Valorization 2022, 13 (2), 1311–1321. https://doi.org/10.1007/s12649-021-01559-y. (28) Taufiqurrohman, M.; Wijaya, K.; Nadia, A.; Purba, S. E.; Syoufian, A. Hydrocracking of LDPE Plastic Wastes into Liquid Fuel by Natural Zeolite Supported Nickel Metal. In Key Engineering Materials; Trans Tech Publications Ltd: Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia, 2022; Vol. 927, pp 154–158. https://doi.org/10.4028/p-t38x2o. (29) Andiena, R. Z.; Wijaya, K.; Syoufian, A. Nanocatalysts of Sulfated Zirconia and Calcium Oxide/Zirconia for Microwave-Assisted Biodiesel Synthesis from Castor Oil. In Materials Science Forum; Trans Tech Publications Ltd: Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Indonesia, 2022; Vol. 1067, pp 167–176. https://doi.org/10.4028/p-4320g2. (30) Hayati, R.; Kurniawan, R.; Prasetyo, N.; Sudiono, S.; Syoufian, A. Codoping Effect of Nitrogen (N) to Iron (Fe) Doped Zirconium Titanate (ZrTiO4) Composite toward Its Visible Light Responsiveness as Photocatalysts. Indones. J. Chem. 2022, 22 (3), 692–702. https://doi.org/10.22146/ijc.70146. 2021 Synthesis of high stability Mo/SiO2 catalyst utilizing Parangtritis beach sand for hydrocracking waste palm oil into biofuelGD Alisha, W Trisunaryanti, A Syoufian, S LarasatiBiomass Conversion and Biorefinery, 1-15 2021 Kimia Kuantum Untuk Perekayasa NanomaterialK Wijaya, A Syoufian, I Tahir, AS Hutama UGM PRESS 2021 PREPARATION OF Co, Ni, AND Zn-BASED CATALYST SUPPORTED ON MESOPOROUS CARBON FOR HYDROCRACKING OF PYROLYZED α-CELLULOSEWT Triyono, A Syoufian, AP Wibawa, E Suarsih, DA Fatmawati environmental pollution 14 (3), 1965-1971 2021 Silica-based solid acid catalyst with different concentration of H2SO4 and calcination temperature: Preparation and characterizationA Aneu, K Wijaya, A Syoufian Silicon 13 (7), 2265-2270 2021 Synthesis and Application of Na2O/ZrO2 Nanocomposite for Microwave-assisted Transesterification of Castor OilD Hidayat, A Syoufian, M Utami, K Wijaya ICS Physical Chemistry 1 (1), 26-26 2021 Performance of Ni-Mo sulfated nanozirconia catalyst for conversion of waste cooking oil into biofuel via hydrocracking processA Hanifa, A Nadia, WD Saputri, A Syoufian, K Wijaya Materials Science Forum 1045, 79-89 2021 The Effects of Manganese Dopant Content and Calcination Temperature on Properties of Titania-Zirconia CompositeMI Muslim, R Kurniawan, MF Pradipta, W Trisunaryanti, A Syoufian Indonesian Journal of Chemistry 21 (4), 882-890 2021 Solid State Mixing Preparation of CaO/Bentonite Nanocomposite and its Application to Improve the Quality of Patchouli OiK Wijaya, M Utami, A Syoufian, AI Murifal Advanced Materials Research 1162, 21-26 2020 Catalytic Synthesis of Diethanolamide Surfactant from Used Cooking OilM Utami, K Wijaya, A Syoufian, SH Wicaksono EKSAKTA: Journal of Sciences and Data Analysis, 133-138 2020 Physico-chemical properties of nano ZrO2-pillared bentonite with nickel as supporting metalM Mirzan, A Syoufian, K Wijaya Nano Hybrids and Composites 30, 9-17 2020 Preparation of calcium oxide/zeolite nanocomposite and its application to improve the quality of patchouli oilK Wijaya, M Utami, A Syoufian, L Hidayatullah Key Engineering Materials 849, 119-124 2020 Cobalt Doping on Zirconium Titanate as a Potential Photocatalyst with Visible-Light-ResponseEF Sulaikhah, R Kurniawan, MF Pradipta, W Trisunaryanti, A Syoufian Indonesian Journal of Chemistry 20 (4), 911-918 2020 Zinc-Doped Titania Embedded on the Surface of Zirconia: A Potential Visible-Responsive Photocatalyst MaterialA Alifi, R Kurniawan, A Syoufian Indonesian Journal of Chemistry 20 (6), 1374-1381 2020 Fuel production from LDPE-based plastic waste over chromium supported on sulfated zirconiL Hauli, K Wijaya, A Syoufian Indonesian Journal of Chemistry 20 (2), 422-429 2019 Kinetics adsorption of heavy oil spills in rivers on magnetite-(CTAB-montmorillonite) adsorbentSH Siregar, K Wijaya, ES Kunarti, A Syoufian IOP Conference Series: Materials Science and Engineering 509 (1), 012136 2019 Chrom/Nanocomposite ZrO2-Pillared Bentonite Catalyst for Castor Oil (Ricinus communis) HydrocrackingK Wijaya, A Syoufian, A Fitroturokhmah, W Trisunaryanti, D Adi Saputra Nano Hybrids and Composites 27, 31-37 2019 Hydrocracking of LDPE plastic waste into liquid fuel over sulfated zirconia from a commercial zirconia nanopowderL Hauli, K Wijaya, A Syoufian Orient. J. Chem 35 (1), 128-133 2019 Synthesis and Characterization of Cu-Doped Zirconium Titanate as A Potential Visible-Light Responsive PhotocatalystKR Andita, R Kurniawan, A Syoufian Indonesian Journal of Chemistry 19 (3), 761-766 2019 Synthesis of Iron-Doped Zirconium Titanate as a Potential Visible-Light Responsive PhotocatalystR Kurniawan, S Sudiono, W Trisunaryanti, A Syoufian Indonesian Journal of Chemistry 19 (02), 454-460 2018 Synthesis and Photoactivity of Fe 3 O 4/TiO 2-Co as a Magnetically Separable Visible Light Responsive PhotocatalystES Kunarti, I Kartini, A Syoufian, KM Widyandari Indonesian Journal of Chemistry 18 (3), 403-410 2018 PENGARUH VARIASI WAKTU DAN KECEPATAN PENGADUKAN DALAM PEMBUATAN ETIL ESTER DARI MINYAK KELAPAJ Jusman, B Setiaji, T Triyono, A Syoufian KOVALEN: Jurnal Riset Kimia 4 (1), 106-114 2018 Preparation and characterization of montmorillonite–cetyl trimethylammonium bromidSH Siregar, K Wijaya, ES Kunarti, A Syoufian, S Suyanta Asian Journal of Chemistry 30, 25-28 2018 Synthesis and Characteristics of the Magnetic Properties of Fe3O4–(CTAB-montmorillonite) Composites, based on Variation in Fe3+/Fe2+ ConcentrationsSH Siregar, K Wijaya, ES Kunarti, A Syoufian Oriental Journal of Chemistry 34 (2), 716 2018 Synthesis of Cr/Al2O3-Bentonite Nanocomposite as the hydrocracking catalyst of Castor oilK Wijaya, AD Ariyanti, I Tahir, A Syoufian, A Rachmat Nano Hybrids and Composites 19, 46-54 2018 Preparation and properties of Fe3O4/SiO2/TiO2 core-shell nanocomposite as recoverable photocatalystES Kunarti, A Syoufian, IS Budi, AR Pradipta Asian J. Chem 28 (6), 1343-1346 2016 Chrome impregnated on Bentonite (Cr-Bentonite) as hydrocracking catalyst of used cooking oilR Mandey, K Wijaya, A Syoufian Asian Journal of Chemistry 28 (2), 282 2016 Sol–gel preparation of photoactive srilankite-type zirconium titanate hollow spheres by templating sulfonated polystyrene latex particlesA Syoufian, Y Manako, K Nakashima Powder Technology 280, 207-210 2015 PEMBUATAN EMULSI M/A (VIRGIN COCONUT OIL-LARUTAN TEH) MENGGUNAKAN POLISORBAT 80 (POLIOKSIETILEN (20) SORBITAN MONOOLEAT) SEBAGAI SURFAKTANANS Utomo Universitas Gadjah Mada 2015 Pengaruh Suhu Kalsinasi pada Sintesis Fe-Doped Titanium Dioksida dengan Metode Sol-GelF FITRIAH, A Syoufian Text 2014 PENGARUH KONSENTRASI GARAM FeCl3· 6H2O PADA KARAKTER Fe-DOPED TITANIUM DIOKSIDA HASIL SINTESIS DENGAN METODE SOL GELNIKA ZAHRIYANI Universitas Gadjah Mada 1 2014 PENGARUH KONSENTRASI Co, SUHU KALSINASI, DAN pH PADA SINTESIS Co-DOPED TiO2 DENGAN METODE SOL GELCR UTAMI Universitas Gadjah Mada 2014 PENGARUH VARIASI KONSENTRASI GARAM FeCl3. 6H2O, SUHU KALSINASI DAN pH TERHADAP KARAKTER Fe-TiO2 YANG DISINTESIS MENGGUNAKAN METODE SOL-GEL; THE EFFECT OF VARIATIONS OF FeCl3 …AD Rosanti Universitas Gadjah Mada 3 2014 PENGARUH KANDUNGAN ZAT ORGANIK TERHADAP KONSENTRASI PLUTONIUM PADA SEDIMEN PANTAI DEPOK YOGYAKARTAGA WASKITO, A Syoufian Text 2014 Hydrocracking of used cooking oil into biofuel catalyzed by nickel-bentonite.K Wijaya, A Syoufian, SD Ariantika Asian Journal of Chemistry 26 (13), 3785-3789 10 2014 Pengaruh konsentrasi Virgin Coconut Oil (VCO) terhadap stabilitas emulsi kosmetik dan nilai Sun Protection Factor (SPF)IAU Mu’awanah, B Setiaji, A Syoufian Bimipa 24 (1), 1-11 36 2014 Purwarupa Sistem Kendali Suhu dengan Pengendali PID pada Sistem Pemanas dalam Proses Refluks/DistilasiTB Pratomo, A Dharmawan, A Syoufian, TW Supardi IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 3 (1 … 12 2013 Characterization and modification of indonesian natural zeolite for hydrocracking of waste lubricant oil into liquid fuel fractionW Trisunaryanti, A Syoufian, S Purwono Journal of Chemistry and Chemical Engineering 7 (2), 175 17 2013 Hydrocracking of palm oil into biogasoline catalyzed by Cr/natural zeolite.K Wijaya, G Baobalabuana, W Trisunaryanti, A Syoufian Asian Journal of Chemistry 25 (16), 8981-8986 13 2013 MULTIPLE REGRESSION ANALYSIS OF THE INFLUENCE OF CATALYST CHARACTERS SUPPORTED ON γ-Al 2 O 3 TOWARDS THEIR HYDROCRACKING CONVERSION OF ASPHALTENEW Trisunaryanti, T Triyono, M Mudasir, A Syoufian Indonesian Journal of Chemistry 4 (1), 6-11 2 2010 Konversi lemak ayam menjadi biodiesel dengan katalis zeolit alam teraktivasi H2SO4 dan NaOHK HADI Universitas Gadjah Mada 1 2009 Degradation of methylene blue in aqueous dispersion of hollow titania photocatalyst: study of reaction enhancement by various electron scavengersA Syoufian, K Nakashima Journal of colloid and interface science 317 (2), 507-512 2008 Titania Hollow Sphere: Synthesis and its ApplicationsA Syoufian 佐賀大学 2007 Degradation of methylene blue in aqueous dispersion of hollow titania photocatalyst: optimization of reaction by peroxydisulfate electron scavengerA Syoufian, K Nakashima Journal of colloid and interface science 313 (1), 213-218 2007 Photocatalytic activity of titania hollow spheres: Photodecomposition of methylene blue as a target moleculeA Syoufian, OH Satriya, K Nakashima Catalysis Communications 8 (5), 755-759 2007 Preparation of submicrometer-sized titania hollow spheres by templating sulfonated polystyrene latex particlesA Syoufian, Y Inoue, M Yada, K Nakashima Materials Letters 61 (7), 1572-1575 2007 Codoping Effect of Nitrogen (N) to Iron (Fe) Doped Zirconium Titanate (ZrTiO 4) Composite toward Its Visible Light Responsiveness as PhotocatalystsR Hayati, R Kurniawan, N Prasetyo, S Sudiono, A Syoufian Indonesian Journal of Chemistry Synthesis of SO 4 2–/ZrO 2 Solid Acid and Na 2 O/ZrO 2 Solid Base Catalysts Using Hydrothermal Method for Biodiesel Production from Low-Grade Crude Palm OilS Setyaningsih, M Utami, A Syoufian, E Heraldy, NW Yuwono, K Wijaya Indonesian Journal of Chemistry EFFECT ACTIVATION OF CHEMICAL AND PHYSICAL TO STRUCTURE AND ACTIVATED CARBON QUALITY FROM CHARCOAL OBTAINED BY PYROLYSIS OF COCONUT SHELLD Tani, B Setiaji, W Trisunaryanti, A Syoufian PREPARATION OF BIODIESEL FROM NYAMPLUNG OIL (Calophyllum inophyllum Linn OIL) USING H-ZEOLITE AND NaOH AS THE CATALYSTK Wijaya, A Syoufian, M Ainuri THE EFFECT OF TEMPERATURE ON BIODIESEL CONVERSION FROM CALLOPHYLUM INOPHYLUM L (NYAMPLUNG) OIL CATALYZED BY H-ZEOLITE AND NaOHK Wijaya, A Syoufian, J Kusmasari fuel 3, 6 |