Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Al-Kimia Criksetra: Jurnal Pendidikan Sejarah
Rika Damayanti
Universitas Sriwijaya
Humanities Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science Languange, Linguistic, Communication & Media Social Sciences

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Pengaruh Katalis NiMo Terhadap Kualitas Minyak Batubara Hasil Pencairan Tidak Langsung Rika Damayanti; Susila Arita R; Fitri Hadiah
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6560

Abstract

Coal is a fossil energy source that is widely used as a soild fuel in many sectors. The development of indirect coal liquefaction technology is one type of technology used to convert coal into a liquid fuel product in the form of coal oil with characteristics resemble petroleum fuels. Coal oil production can be an alternative fuel source for future energy needs. In this study, the indirect liquefaction process of coal (calorific value = 6400 kcal/kg) was done in the fluidized bed reactor by heating the reactor with an electric furnace, where the process took place at temperature 350oC - 500oC and the catalyst weight was varied into 0%, 5%, 10%, and 15%. Air with a flow rate 2 LPM is flowed during the process and the lenght of the process was 60 minutes. From this research, the best characteristics of coal oil produced at a temperature of 400oC - 450oC with a catalyst weight of 15%. The characteristics of the coal oil obtained have a density of 0.852 g / cm3, specific gravity of 0.853 and oAPI gravity of 34.41. The results of GC-MS analysis was known that 46.15% of the composition of hydrocarbons in coal oil is the fraction of gasoline.
The Characteristic of Coal Oil From Catalytic Coal Gasification Rika Damayanti; Susila Arita; Fitri Hadiah
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 4, No 2 (2019): June 2019
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v4.i2.59

Abstract

In this work, the catalytic gasification process of coal was studied at different operating temperatures and catalyst weights. The purpose of this study was to study the characteristics of coal oil produced through the gasification process using Nickel Molybdenum (NiMo) catalyst. The effect of adding NiMo catalyst with variations in weight of 0%, 5%, 10% and 15% for different gasification temperatures (375 – 385 °C, 430 – 440 °C, and 475 – 485 °C) were studied on coal with a calorific value of 6,400 kcal/kg. The process was done in fluidized bed reactor under atmospheric pressure and an air flow rate of 2 liters/minute was flow for 60 minutes. The results showed that NiMo is effective as a catalyst in the gasification of coal at 430 – 440 °C, the addition of 15% weight of catalysts produced coal oil with a yield of 9.35% and the composition of hydrocarbon consists of 59.75% of aromatics, 26.42% of aliphatics, and 7.34% of phenolics. Compared to coal oil without catalyst give a yield of 6.56% with 57.33% of aromatics, 17.44% of aliphatics, and 16.03% of phenolics. This showing that NiMo catalysts have a high selectivity to increase aromatic and aliphatic hydrocarbons in coal oil.
Pengaruh Metode Problem Solving terhadap Hasil Belajar Siswa pada Mata Pelajaran Sejarah di Kelas X SMA Negeri 1 Mendo Barat Bangka Rika Damayanti; Sani Safitri
Criksetra: Jurnal Pendidikan Sejarah Vol 7, No 2 (2018)
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jc.v7i2.6899

Abstract

Abstract: This thesis is entitled the influence of the Problem Solving method on student learning outcomes in historical subjects in class X of SMA Negeri 1 Mendo Barat Bangka. The formulation of the problem in this study is how the effect of the Problem Solving method on student learning outcomes in History subjects in SMA 1 Mendo Barat Bangka. This study uses an experimental method that is treatment and without treatment. The population in this study were all class X which amounted to 171 students, while the study sample was taken by Random Sampling technique so that it was obtained as a sample of 74 students namely the experimental class (class X IPA 1) totaling 37 students and the control class (class X IPA 2) amounting to 37 students. Data collection was carried out through the implementation of both pree test and post test which numbered 25 multiple choice questions. The results of this study indicate that, in the experimental class, the average learning outcomes of the final test students were 79.43, while the control class average student learning outcomes obtained in the final test was 68.86. Furthermore, the data were analyzed using the t test with a significant level of ? = 0.05 and dk = n1 + n2 - 2 = 72 which is 1.66, obtained by the hypothesis test t count of 4.76 because t count> t table (4.76> 1.66) then accept Ha and reject Ho, meaning learning history by applying the Problem Solving method gives an influence on student learning outcomes in class X SMA 1 Mendo Barat Bangka.  Keywords: Problem Solving method and student learning outcomes
Co-Authors Fitri Hadiah Sani Safitri Susila Arita