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Preparation And Characterization Of Cr/Activated Carbon Catalyst From Palm Empty Fruit Bunch Fanani, Zainal; Rohendi, Dedi; Dewi, Tri Kurnia; Dzulfikar A, Muhammad
Indonesian Journal of Fundamental and Applied Chemistry Vol 1, No 2 (2016): June 2016
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i2.35

Abstract

Preparation and characterization of Cr/activated carbon catalyst from palm empty fruit bunch had been done. The research were to determine the effect of carbonization temperature towards adsorption of ammonia, iodine number, metilen blue number, and porosity of activated carbon and Cr/activated carbon catalyst. The determination of porosity include surface area, micropore volume and total pore volume. The results showed the best carbonization temperature activated carbon and Cr/activated carbon catalyst at 700°C. The adsorption ammonia of activated carbon and Cr/activated carbon catalyst as 6.379 mmol/g and 8.1624 mmol/g. The iodine number of activated carbon and Cr/activated carbon catalyst as 1520.16 mg/g and 1535.67 mg/g. The metilen blue number of activated carbon and Cr/activated carbon catalyst as 281.71 mg/g and 319.18 mg/g. The surface area of activated carbon and Cr/activated carbon catalyst as 1527.80 m2/g and 1652.58 m2/g. The micropore volume of activated carbon and Cr/activated carbon catalyst as 0.7460 cm3/g and 0.8670 cm3/g. The total pore volume of activated carbon and Cr/activated carbon catalyst as 0.8243 cm3/g and 0.8970 cm3/g.Keywords : activated carbon, palm empty fruit bunch, porosity, catalyst, chromium
Conversion of Waste Oil into Fuel Oil : Dewi, Tri Kurnia
Sriwijaya International Seminar on Energy-Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Sriwijaya International Seminar on Energy-Environmental Science and Technology

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Abstract

Research has been conducted to convert waste lubrication oil into fuel oil. This work is the second part of a bigger work entittled “Conversion of Waste Oil into Fuel Oil”. The first part dealing with the production of catalyst and the effect of temperature, whilst this part studying the effect of catalyst ratio. This work was done with procedure similar with the first part of the work. Convertion of waste lubrication oil into fuel oil was done using hydrocracking process with catalyst of combination of chromium and activated natural zeolith (Cr/ZAA). Controlled variables used for this researh were the type of waste oil (lubrication oil), feed volume (40 ml), temperature (500°C), and hydrogen gas rate (20 ml/sec). The weight ratio of the catalyst and waste oil feed was varied at 1/8, 1/4, 1/3, 1/2, and 2/3. The parameters used to analyse the results were the amount of hydrocracking product, percentage of cracking fraction (gasoline, kerosene and solar) in the product and the heating value of the product. Analytic works were carried out with GC for cracking fraction and bomb calorimeter for heating value of the produced fuel oil. Results showed that the amount of hydrocracking product decreases with the increase of catalyst ratio. Increasing catalyst ratio increases gasoline fraction lineary, decreases kerosene and solar fractions. The heating value of the product lineary increases with catalyst ratio. Best catalyst ratio for this work was 1/8 to get maximum amount of product (13.16 ml for 40 ml feed), and 2/3 to get maximum gasoline fraction (56.70%), and highest heating value (44.92 kJ/gr).
Peningkatan Keterampilan Pemecahan Masalah Pengukuran Sudut melalui Penerapan Model Pembelajaran Problem Solving Learning (PSL) pada Peserta Didik Kelas IV Sekolah Dasar Dewi, Tri Kurnia
Jurnal Didaktika Dwija Indria Vol 7, No 3 (2019): Jurnal Didaktia Dwija Indria Maret 2019
Publisher : Universitas Sebelas Maret

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Abstract

The direction of this research was to upgrade the problem solving skills of angular measurement by applying the problem solving learning (PSL) model in fourth grade students of public elementary school Tambakreja 02 Cilacap 2018/2019 academic year. This research was a classroom action research consists of 3 cycles with of 2 meetings. Every cycle consist 4 phases. The subjects of this research were 27 students and teachers.Data accumulating technique used interviews, observation, tests, and documentation. The data validity technique used source triangulation and technical triangulation. Data analysis technique maked use of critical analysis, descriptive comparative techniques, and interactive analysis models. The results showed that the average score of pre-action was 41.04 with classical completeness of 3.70%, increase in first cycle to 65,85 with classical completeness of 33,33%, increased at second cycle to 77,36 with classical completeness 66.67%, increased again in third cycle to 83,41 with classical completeness of 88.89%. Results of the research, it can be summarized that through the application of the problem solving learning (PSL) model can improve the problem solving skills of angular measurements in fourth grade student of SDN Tambakreja 02 Cilacap 2018/2019 academic year.Keyword: problem solving skills, problem solving learning model, angular measurement, and elementary school
Synthesis of Catalyst Cobalt Impregnated on Activated Natural Zeolite, Co/ANZ Dewi, Tri Kurnia; Fanani, Zainal
Indonesian Journal of Fundamental and Applied Chemistry Vol 2, No 1 (2017): February 2017
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v2.i1.01

Abstract

Research has been done on the synthesis of catalyst Co/Activated Natural Zeolite. The variables studied were the mass ratio of Cobalt to Zeolite and temperature of reduction during catalyst activation. The catalyst produced were analysed in their acidity and surface area. Acidity was presented in the form of ammonia and pyridine adsorption on the catalyst surface. The results showed the increasing Cobalt to Zeolite mass ratio will increase acidity of the catalyst produced. Reduction temperature during catalyst activation also gave same effect as Cobalt to Zeolite mass ratio did. Best ratio within the range of this study was Cobalt to Zeolite mass ratio of 6:20, which was found at reduction temperature of 400 C. This ratio gave catalyst acidity correspond to ammonia adsorption of 6.4615 mmol/g, and to pyridine adsorption of 2.6047 mmol/g catalyst. The best reduction temperature was 450 C at ratio of 6:20. The acidity of this catalyst was of 7.5202 mmol/g as in ammonia adsorption, and was of  3.662 mmol/g as in pyridine adsorption. Catalyst surface area of the best ratio was 32.63 m2/g, whilst catalyst surface area of the best reduction temperature was 38.95 m2/g. Keywords: catalyst, cobalt, activated natural Zeolite