Sugeng Triwahyono
Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, Skudai Johor Bahru 81310

Published : 5 Documents
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Condensation of Indole with Isatin over AlCl3/Mesoporous Aluminosilicate Purbaningtias, Tri Esti; Prasetyoko, Didik; Bahruji, Hasliza; Zein, Yusuf Muhammad; Triwahyono, Sugeng; Fadlan, Arief; Qoniah, Imroatul
Indonesian Journal of Chemistry Vol 15, No 1 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.91 KB) | DOI: 10.22146/ijc.21224

Abstract

Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the condensation of isatin with indole. AlCl3/mesoporous aluminosilicate (AlCl3/AM) catalysts were prepared by impregnation of 1, 5, 10 and 15 wt% AlCl3 on the surface of mesoporous aluminosilicate. A maximum conversion of isatin was achieved using 15% AlCl3/AM catalyst whereas the highest selectivity of 68.97% towards trisindoline was obtained using pure AM. The activity of the catalysts was depended on their acid site number and surface area. The number of Brønsted acid and the surface area affected to the conversion of isatin while the total acidity and the number of Lewis acid influenced the selectivity.
Catalytic CO Methanation over Mesoporous ZSM5 with Different Metal Promoters Teh, Lee Peng; Triwahyono, Sugeng; Jalil, Aishah Abdul; Setiabudi, Herma Dina; Abdul Aziz, Muhammad Arif
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 1 Year 2019 (SCOPUS and Web of Science Indexed, April 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4606.645 KB) | DOI: 10.9767/bcrec.14.1.3618.228-237

Abstract

The carbon monoxide methanation has possessed huge potential as an effective method to produce synthetic natural gas (SNG). The basic requirements such as high catalytic activity at low temperatures (<500 °C) and high stability throughout all temperatures is needed for an ideal methanation catalysts. The ultimate goal of the study is to examine the influential of different metal promoters towards catalytic properties and catalytic CO methanation performance. A series of metal promoters (Rh, Co, Pd and Zn) mesoporous ZSM5 were synthesized using an incipient-wetness impregnation method and evaluated for catalytic CO methanation. XRD analysis showed that only metal oxides and no metallic phase of Rh, Co, Pd, and Zn were observed. The nitrogen physisorption analysis showed that mZSM5 possessed high surface area and micro-mesoporosity with intra- and interparticle pores. FESEM analysis illustrated that mZSM5 had typical coffin-type morphology and Rh metal dispersed on the surface of the support was confirmed by EDX analysis. Moreover, Rh (CO conversion = 95%, CH4 yield = 82%) and Co (CO conversion = 91%, CH4 yield = 71%) promoters showed significant improvement in CO methanation. On the other hand, Pd (CO conversion = 18%, CH4 yield = 12%) and Zn (CO conversion = 10%, CH4 yield = 9%) promoters had only low benefit to the CO methanation. This study affirmed that the catalytic activity of CO methanation was influenced by the variation in the type of metal loading due to different nature of metallic phases and their synergistic interaction with the supporting material. Copyright © 2019 BCREC Group. All rights reserved 
Direct Synthesis of Sodalite from Indonesian Kaolin for Adsorption of Pb2+ Solution, Kinetics, and Isotherm Approach Wahyuni, Tri; Prasetyoko, Didik; Suprapto, Suprapto; Qoniah, Imroatul; Bahruji, Hasliza; Dawam, Ahmad Anwarud; Triwahyono, Sugeng; Jalil, Aishah Abdul
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (SCOPUS and Web of Science Indexed, December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.528 KB) | DOI: 10.9767/bcrec.14.3.2939.502-512

Abstract

Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were optimized by varying the Si/Al ratios, stirring and aging conditions, and water composition. X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscope-Energy Dispersive X-ray (SEM-EDX), and Particle Size Analyzer (PSA) were used to characterize sodalite. The potential of sodalite as adsorbent for heavy metal Pb2+ ions removal from waste water was investigated in this work. The uptake adsorption capacities of sodalite was 90-100 mg/g from synthesized sodalite crystallized for 24 and 48 hours, and commercial silica. The kinetic of Pb2+ adsorption was a pseudo second order reaction and the adsorption coefficients was followed Langmuir adsorption isotherm. Copyright © 2019 BCREC Group. All rights reserved
Activities of Heterogeneous Acid-Base Catalysts for Fragrances Synthesis: A Review Hartati, Hartati; Santoso, Mardi; Triwahyono, Sugeng; Prasetyoko, Didik
Bulletin of Chemical Reaction Engineering & Catalysis 2013: BCREC Volume 8 Issue 1 Year 2013 (SCOPUS Indexed, June 2013)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1083.912 KB) | DOI: 10.9767/bcrec.8.1.4394.14-33

Abstract

This paper reviews various types of heterogeneous acid-base catalysts for fragrances preparation. Catalytic activities of various types of heterogeneous acid and base catalysts in fragrances preparation, i.e. non-zeolitic, zeolitic, and mesoporous molecular sieves have been reported. Generally, heterogeneous acid catalysts are commonly used in fragrance synthesis as compared to heterogeneous base catalysts. Heteropoly acids and hydrotalcites type catalysts are widely used as heterogeneous acid and base catalysts, respectively. © 2013 BCREC UNDIP. All rights reservedReceived: 20th January 2013; Revised: 31st March 2013; Accepted: 1st April 2013[How to Cite: Hartati, H., Santoso, M., Triwahyono, S., Prasetyoko, D. (2013). Activities of Heterogeneous Acid-Base Catalysts for Fragrances Synthesis: A Review. Bulletin of Chemical Reaction Engineering & Catalysis, 8 (1): 14-33. (doi:10.9767/bcrec.8.1.4394.14-33)][Permalink/DOI: http://dx.doi.org/10.9767/bcrec.8.1.4394.14-33] | View in  |
Esterification of Benzyl Alcohol with Acetic Acid over Mesoporous H-ZSM-5 Kusumaningtyas, Desy Tri; Prasetyoko, Didik; Suprapto, Suprapto; Triwahyono, Sugeng; Jalil, Aishah Abdul; Rosidah, Afifah
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 2 Year 2017 (SCOPUS and Web of Science Indexed, August 2017)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (163.504 KB) | DOI: 10.9767/bcrec.12.2.806.243-250

Abstract

In this study, the performance of mesoporous ZSM-5 has been studied on the esterification of acetic acid (AA) with benzyl alcohol (BA). The mesoporous ZSM-5 catalyst has been synthesized with the variation of aging time i.e. 6, 12, and 24 hours at the same temperature, 70 °C. The cation exchange of Na-ZSM-5 to H-ZSM-5 was performed before the catalytic activity test. The acidity type and amount of solids were determined by FT-IR spectroscopy using pyridine as a probe molecule. The characterization by pyridine adsorption showed that at a higher mesoporous surface area, the number of Lewis acid was increased. The highest mesoporous surface area, Lewis, and Brönsted acid sites were obtained by sample which has the lowest crystallinity, i.e. 255.78 m2/g, 0.2732 mmol/g, and 0.20612 mmol/g, respectively. Influence of mesoporous volume was studied on the catalytic activity of the mesoporous ZSM-5 in the esterification reaction. Conversion of acetic acid in the esterification reaction for samples of    HZ-6, HZ-12, and HZ-24 were obtained by titration methods, i.e. 39.59, 36.39, and 32.90 %, respectively. Hence, the reaction temperature of 393 K, molar ratio 1:4 (AA:BA) and catalyst loading 5 % were selected as an optimum reaction parameters. Copyright © 2017 BCREC Group. All rights reservedReceived: 21st November 2016; Revised: 1st February 2017; Accepted: 18th February 2017How to Cite: Kusumaningtyas, D.T., Prasetyoko, D., Suprapto, Triwahyono, S., Jalil, A.A., Rosidah, A. (2017). Esterification of Benzyl Alcohol with Acetic Acid over Mesoporous H-ZSM-5. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (2): 243-250 (doi:10.9767/bcrec.12.2.806.243-250)Permalink/DOI: http://dx.doi.org/10.9767/bcrec.12.2.806.243-250