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MENYELESAIKAN PROGRAM PECAHAN LINEAR DENGAN MENGGUNAKAN PROGRAM DINAMIS MAJU
(Elfitra, 2023-12) Liandra, Suci Oktavi
This final project discusses the solution of fractional linear programming using dynamic
programming forward methods. The solution to this problem is to find the
optimal solution of the fractional linear programing by changing the fractional objective
function to an approximation function using the simplified method, followed
by using the simplex method until the optimal solution is obtained. Then, the optimal
solution is found using the dynamic programming forward method. It can be
concluded that the dynamic programming forward method produces better solution
compared to the approximation of objection function methods.
PENGARUH VARIASI WAKTU HIDROTERMAL PADA SINTESIS ZEOLIT DARI LEMPUNG MAREDAN
(Elfitra, 2023-12) Rahayu, Sri; Sophia, Halida; Sholeha, Novia Amalia
Maredan clay from the western part of Maredan Village, Siak Regency, Riau
Province can be used as raw material for zeolite synthesis. This study aims to
determine the characteristics of zeolite synthesized with variations in hydrothermal
time. Zeolite synthesis was carried out using the hydrothermal method with time
variations of 5, 6, 20, 24, 36 and 48 hours. Data from the characterization of
Maredan clay using XRF proved that Maredan clay has an Al2O3 content of
32.513% and SiO2 47.751%. XRD analysis showed that the synthesis of zeolite in
samples with different time variations showed peaks of sodalite type zeolite
appearing around 2θ = 14.16˚, 24, 65˚, 31.99˚ and 43.39˚, in addition to sodalite
appeared zeolite A (LTA) in the area 2θ = 27.11˚, 32.54˚, 34.18˚, 42.85˚ and several
peaks of zeolite Y around 2θ = 18.644˚. The zeolite synthesis product in this study
is an impure type of zeolite because it contains several zeolite phases consisting of
sodalite and zeolite Y. The crystallinity and crystal size of sodalite are 21.21; 27.45;
17.32; 16.92; 21.48; 126.81 % and 56.35; 42.28; 59.43; 25.35; 42.28; 126.82 nm.
The crystallinity and crystal size of zeolite A (LTA) are 7.42; 9.99; 15.18; 11.54;
10.93; 5.70 % and 52.09; 43.59; 107.27; 18.6; 52.28; 52.29 nm.
ELEKTRODA KARBON AKTIF BERBASIS BIOMASSA PELEPAH KELAPA SAWIT (ELAEIS GUINNESIS JACQ) DENGAN PENAMBAHAN KATALIS NiCl2 UNTUK APLIKASI SEL SUPERKAPASITOR
(Elfitra, 2023-12) Manfaah, Siti Nur
Supercapacitors are renewable energy storage devices that have relatively high power
density and performance, as well as fast charging-discharging. Activated carbon is one of
the materials that can be used as electrodes because from amorphous carbon materials
with high porosity and large surface area. The addition of catalysts aims to convert
amorphous carbon into graphitic carbon with a hight degree of graphitization. This
research utilized oil plam frond waste (PKS) without and with the addition of 0,1 M and
0,2 M NiCl2 catalysts with the respective sample codes namely PKS, PKS-01, and PKS-
02. Making carbon electrodes is carried out using several processes, precarbonization
process, chemical activation using a KOH activator and the addition of a NiCl2 catalyst,
the carbonization process using N2 gas at a temperature of 600oC and physical activation
using CO2 gas at a temperature of 800oC. The highest density shrinkage was found in the
PKS-01 sample namely 31,0534%.
SINTESIS BIODIESEL MENGGUNAKAN KATALIS CaO-SiO2 (3%) DARI CANGKANG KERANG DARAH DAN ABU SABUT PINANG KALSINASI 800ºC
(Elfitra, 2023-12) Permatasari, Silvia Eka; Nurhayati, Nurhayati
Biodiesel is an alternative fuel that is produced conventionally through the
transesterification reaction of triglycerides or oil with short-chain alcohols and a
catalyst. This research aims to increase the catalytic ability of the catalyst by
modifying the CaO catalyst from blood cockle shells with SiO2 derived from
areca palm ash through the impregnation method for use in the biodiesel
production process. SiO2 impregnated with ratios of 3% w/w to the weight of
CaO. The resulting catalyst was applied for biodiesel production with yield
optimization using Response Surface Methodology (RSM) with a Box Behnken
Design (BBD) design. Analysis using BET shows that the surface area of CaOSiO2
3% has increased. XRF analysis of the 3% CaO-SiO2 catalyst obtained a
CaO composition of 97.44%. At the optimum condition highest biodiesel yield
was 95.95%
SINTESIS DAN KARAKTERISASI KATALIS CaO-SiO2 DARI CANGKANG KERANG DARAH DAN SABUT PINANG UNTUK PRODUKSI BIODIESEL
(Elfitra, 2023-12) Marlinda, Ririn
Calcium oxide (CaO) is a catalyst that is widely used for biodiesel synthesis reactions
because it has relatively high base strength, but the CaO catalyst has the weakness of a low
surface area. Therefore, to increase biodiesel yield the CaO catalyst needs to be modified
using silica to increase the surface area of the catalyst and its catalytic activity. The aim of
this research is to synthesize and characterize the CaO catalyst modified by SiO2 areca palm
ash using the impregnation method with the SiO2 ratio of 3% w/w to the weight of CaO. The
resulting catalyst was applied for biodiesel production with yield optimization using a
Response Surface Methodology (RSM) design. Analysis using BET shows that the surface
area of CaO-SiO2 has increased. XRF analysis for the 3% CaO-SiO2 catalyst obtained a SiO2
composition of 0.66 and a CaO composition of 97.496%. Based on the optimum results, the
highest biodiesel yield was 94.29%.