Preparation of Pt-Zeolite Catalyst for Conversion of n-Octanol = Pembuatan Katalis Pt-Zeolit untuk Konversi n-Oktanol.

Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCI4 solution. After separation, the sample was dried and calcinated at 550°C for 4 hours under nitrogen stream. Furthermore, the sample was oxydized with oxygen gas at 350°C for 2 hours and reduced with hydrogen gas at 400°C for 2 hours. Total amount of impregnated metal, acidity and surface are of the samples were determined by using atomic absorption spectrophotometric, gravimetric and gas sorption methods, respectivelly. The activity test was done in a fixed bed reactor and the result of the reaction were analyzed by using gas chromatograph. The result of the characterization showed that the higher total amount of impregnated metal, the lower the surface area and total volume of pores. The acidity and the catalyst activity increase with the increasing of the total amount of impregnated metal. The flow rate of feed and temperature reaction also influence yield conversion. The optimum yield of n-octanol conversion was obtained at 400°C with the showest flow rate of n-octanoland flow rate of H2 gas was equal to 40 ml/minute. Keywords: Catalyst, Impregnation, Characterization and Conversion

Aktivitas Antioksidan Ekstrak Biji Duwet (Syzygium Cumini Linn.) pada Peroksidasi Lipida secara In Vitro

Tanaman duwet (Syzygium cumini Linn.) pada semua kompartemennya dimanfaatkan masyarakat untuk pengobatan suatu penyakit. Ekstrak bijinya dimanfaatkan untuk penurun gula darah. Bijinya merupakan bagian tanaman yang kaya senyawa polifenol. Fraksi kaya senyawa fenolik dipreparasi dengan mengekstraksi biji duwet varietas "Genthong", dengan tiga jenis ekstraktan; etil acetat 85%, metanol 50% dan etanol 50%. Ekstrak biji duwet (EBD) yang diperoleh dianalisis kelompok senyawa fenolik dan aktivitas antioksidan menggunakan metode uji penangkapan radikal DPPH (2,2-diphenil 1-picrylhydrazyl), uji reduksi ion Feri (ferric reduction antioxidant power-FRAP) dan uji penghambatan peroksidasi asam lemak linoleat. Tujuan penelitian adalah memilih satu dari tiga ekstraktan yang menghasilkaan ekstrak, dengan yield dan kadar senyawa polifenolik terbesar serta sifat antioksidatif terkuat. Yield dengan ekstraktan Met-OH-50%, sebesar 16,29% (db), senyawa fenoliknya sebesar 45,99 ±0,25 g-GAE/100 g-EBD; 2,28±0,07 g-QE/100 g-EBD dan 26,9±0,07 g-TAE/100 g-EBD. Ketiga ekstrak kuat dalam uji penangkapan radikal DPPH antara 87-95 % (100 g-mL-l) dan uji reduksi ion Feri (Fe3+), moderat pada uji penghambatan peroksidasi lipid, 49-52 % pada 400 g- mL-l

Preparation of Pt-Zeolite Catalyst for Conversion of n-Octanol

Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After separation, the sample was dried and calcinated at 550 °C for 4 hours under nitrogen stream. Furthermore, the sample was oxidized with oxygen gas at 350 °C for 2 hours and reduced with hydrogen gas at 400 °C for 2 hours. Total amount of impregnated metal, acidity and surface are of the samples were determined by using atomic absorption spectrophotometric, gravimetric and gas sorption methods, respectively. The activity test was done in a fixed bed reactor and the results of the reaction were analyzed by using gas chromatograph. The result of the characterization showed that the higher total amount of impregnated metal, the lower the surface area and total volume of pores. The acidity and the catalyst activity increase with the increasing of the total amount of impregnated metal. The flow rate of feed and temperature reaction also influence yield conversion. The optimum yield of n-octanol conversion was obtained at 400 °C with the showest flow rate of n-octanol and flow rate of H2 gas was equal to 40 mL/minute

Proceedings of the 3rd International Conference on Community Engagement and Education for Sustainable Development

This proceeding contains articles on the various ideas of the academic community presented at The 3rd International Conference on Community Engagement and Education for Sustainable Development (ICCEESD 2022) organized by the Universitas Gadjah Mada, Indonesia on 7th-8th December 2022.  ICCEESD is a biannual forum for sharing, benchmarking, and discussing HEI’s activities in developing Education for Sustainable Development towards community engagement. Education for Sustainability as a teaching strategy for resolving community challenges through formal, informal, or non-formal education is expected to benefit from various community service best practices by academics, researchers, and students. The 3rd ICCEESD has “Strengthening Education for Sustainability Towards Better Community Engagement” as its theme this year. It is expected that the 3rd ICCEESD will provide a forum for the presenters and participants to exchange best practices, policies, and conceptual implementation of Education for Sustainability towards better community engagement and explore ideas to address community needs.  Conference Title: 3rd International Conference on Community Engagement and Education for Sustainable DevelopmentConference Theme: Strengthening Education for Sustainability Towards Better Community EngagementConference Acronyms: ICCEESD 2022Conference Date: 7th-8th December 2022Conference Location: Grand Rohan Jogja Yogyakarta, IndonesiaConference Organizer: Universitas Gadjah Mada, Indonesi