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All Journal Journal of Renewable Energy, Electrical, and Computer Engineering Chemical Engineering Journal Storage (CEJS)
Putra, Robertus Dhimas Dhewangga
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Microwave-Assisted Pyrolysis of Rice Husk Waste Using Silicon Carbide: Effects of Particle Size and Holding Time Zaka, Ahmad Murtadlo; Saptoadi, Harwin; Putra, Robertus Dhimas Dhewangga
Chemical Engineering Journal Storage (CEJS) Vol. 5 No. 2 (2025): Chemical Engineering Journal Storage (CEJS)-Mei 2025
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v5i2.21615

Abstract

Microwave pyrolysis converts rice husk waste into biochar, bio-oil, and gas products. This research utilized a microwave oven and a conventional oven to process rice husk into pyrolysis products, with silicon carbide (SiC) serving as an absorber in the primary microwave reactor and a natural zeolite catalyst in the secondary oven reactor. The particle size variations of rice husk waste were 2-1 mm, 1-0.5 mm, and 0.5-0.25 mm, with holding times of 5, 10, 15, and 20 minutes. The smallest particle size (0.25-0.5 mm) exhibited the fastest and most consistent heating rate, reaching 400 ËšC in 900 seconds and 450 ËšC in 1268 seconds. The highest biochar yield was obtained at a 5-minute holding time, whereas the highest bio-oil yield was achieved at 20 minutes. The highest gas yields for 1-2 mm (17.80%) and 0.5-1 mm (17.90%) were achieved at 5 minutes of holding time, whereas 0.25-0.5 mm particles yielded the highest gas (21.60%) at 20 minutes. The highest total energy of 1.153 MJ was obtained at size 1-2 with a holding time of 10 minutes and size 0.5-1 mm with a holding time of 5 minutes, while 0.25-0.5 mm particles reached 1.122 MJ at 10 minutes. The highest energy efficiency was achieved at a holding time of 5 minutes, recorded at 21.44% for particles sized 0.25-0.5 mm. This value is higher compared to particles sized 0.5-1 mm (21.21%) and 1-2 mm (19.84%). These results contribute to the optimization of rice husk waste management and the sustainable utilization of biomass
The Effect of Temperature Variation and Absorber Type on the Pyrolysis of Sawdust Using Microwaves Saputro, Muhammad Arief; Saptoadi, Harwin; Putra, Robertus Dhimas Dhewangga
Journal of Renewable Energy, Electrical, and Computer Engineering Vol. 5 No. 2 (2025): September 2025
Publisher : Institute for Research and Community Service (LPPM), Universitas Malikussaleh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jreece.v5i2.19543

Abstract

Biomass is a renewable and environmentally friendly energy source. However, its utilization is often inefficient, such as in direct combustion and biological processes. Pyrolysis, a method of heating biomass without oxygen, can enhance the value of biomass by producing gas, oil, and char. Microwave technology makes the pyrolysis process more efficient. This study varied the pyrolysis temperatures (350°C, 400°C, 450°C, 500°C) and used KOH and SiC as varied absorbers. KOH was chosen because it contains O and H elements that help absorb microwaves, while SiC is effective in improving heating efficiency. The results showed that pyrolysis at 350°C produced the highest biochar yield of 59.3% of the biomass weight. The highest bio-oil yield, 27.7%, was obtained at 400°C.Pyrolysis without an absorber demonstrated that sawdust cannot absorb microwaves effectively, as the temperature only reached around 200°C, which is insufficient for pyrolysis. SiC increased the temperature of the sawdust (between 200°C - 330°C) earlier than KOH. However, KOH led to higher bio-oil production than SiC. The findings suggest that absorber type and pyrolysis temperature significantly influence the efficiency and product distribution. Microwave-assisted pyrolysis with absorbers offers a promising method for converting biomass into valuable energy products, highlighting its potential for further development.
Co-Authors Harwin Saptoadi Muhammad Arief Saputro Zaka, Ahmad Murtadlo