Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Konversi Jurnal ATMOSPHERE
Niawanti, Helda
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
The ability of the Ni/Al2O3 catalyst in the CO2 methanation process in terms of variations in CO2 flow rate and catalyst Parega, Sultan; Junaidi, Robert; Nugroho, Didiek Hari; Niawanti, Helda
Konversi Vol 13, No 2 (2024): OKTOBER 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i2.20235

Abstract

Carbon dioxide (CO2) is one of the biggest contributors to the greenhouse effect. Based on International Energy Agency (IEA) data, global emissions of carbon dioxide (CO2) from burning energy and industrial activities will reach 36.8 billion tons in 2022. The increase in emissions in 2022 will mainly come from burning coal and fuel oil (Fuel Oil). Carbon dioxide emissions from coal rose 1.6% while fuel oil emissions increased 2.5%. One effort to reduce carbon dioxide emissions is to convert carbon dioxide into methane gas (CH4) which can be used as fuel. This research aims to produce methane gas from carbon dioxide using Ni/Al2O3 catalyst treatment and varying CO2 flow rates. In this research, CO2 was used as a raw material with a Ni/Al2O3 catalyst and Zn metal. Based on the research results, the highest conversion yield of methane gas was 49.23% with a variation of 0.05 L/minute with Ni_R4 catalyst treatment
PENGARUH PENGERINGAN TERHADAP KADAR TANIN TEH HERBAL DAUN BELIMBING WULUH (AVERRHOA BILIMBI) Azkia Azhara Assya; Owin Ikhlas; Novy Pralisa Putri; Niawanti, Helda
jurnal ATMOSPHERE Vol. 3 No. 1 (2022): ATMOSPHERE
Publisher : Teknik Kimia ITN Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/atmosphere.v3i1.4654

Abstract

Herbal tea is a beverage product that people widely consume to improve health. Herbal teas are processed from various types of plants that contain bioactive compounds. One of the plants that contain bioactive compounds is Averrhoa bilimbi. The drying process is influenced by several parameters, including time and airflow velocity. This study aims to determine the effect of these two parameters on the drying process using a tray dryer on reducing the moisture content and tannin content of herbal tea. Averrhoa bilimbi leaves were dried at 65 ° C, drying times of 60, 90, 120 minutes, and airflow velocities of 6.8, 9.3, and 10 km/hour. The highest air content decreasing was 68%, and the highest tannin content was 1,871 ± 0.283%, which was obtained at an airflow velocity of 6.8 km/hour and a time of 120 minutes. The results showed that the drying time of 120 minutes did not damage the bioactive tannin compounds, and the decrease in air content in the results of drying could increase the levels of tannins extracted when the leaves were brewed into a drink that could be consumed.
Co-Authors Azkia Azhara Assya Didiek Hari Nugroho Novy Pralisa Putri Owin Ikhlas Parega, Sultan Robert Junaidi