#TITLE_ALTERNATIVE#

• Main Author: WAHYUDI (NIM 23705005), AGUS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9836
• Institution: Institut Teknologi Bandung

Liquid coal is a future energy which keeps being developed to replace fossil based unrenewable energy source. One most important factor to run this process is the role of catalyst. This requirement leads to question how to provide low cost catalyst in abundant. In this research, pyrite mineral (iron-sulfide) from gold mining waste has been employed. Pyrite which its content has been increased to 92%, was measured its activity by sulfidazing test. The product, active compound pyrhotite (Fe1-xS) was characterized by XRD and crystal size was determined by Scherer equation. This pyrite sulfidazing test at coal liquefy's temperature (400 degrees C) resulted pyrhotite crystal with size 33.13 nm. Next investigation, we conducted pyrite mineral activation at temperature 400, 500 and 600 degrees C to obtain hematite. This hematite then was milled by HEM (high energy milling) resulted 50-300 nm in size. After sulfidazing test at temperature 400 degrees C, we acquired active compound pyrhotite with crystal size 24 nm. Crystal size of pyrhotite affects coal liquefy’s rate and yield. Smaller the sizes, the better influence to coal liquefy conversion process. Finally, hematite as a nano catalyst used for coal liquefaction process and reached the conversion up to 91.05%.