Please use this identifier to cite or link to this item:
Title: Bioleaching of refinery hydroprocessing Ni-Mo catalyst by heterotrophic fungi
Keywords: Spent catalyst, Bioleaching
Issue Date: 11-Jun-2008
Citation: MOHAMMAD MOYDUL ISLAM (2008-06-11). Bioleaching of refinery hydroprocessing Ni-Mo catalyst by heterotrophic fungi. ScholarBank@NUS Repository.
Abstract: Spent NiMo catalyst was physically and chemically characterized, and subjected to 1-step and 2-step bioleaching processes using Aspergillus niger and Penicilium simplicissium. SEM-EDX analysis of the decoked spent catalyst revealed a change in the metal distribution within the catalyst during the decoking process. This paved a way to explain the metal leaching kinetics during bioleaching. In general, A. niger showed a higher metal leaching efficiency than P. sp. The highest Mo (87.3%) and Al (17.20%) leaching efficiencies were obtained (at the end of 43 days) from decoked grounded (<45B5m) spent catalyst whereas the highest Ni leaching efficiency (94%) was achieved from the as-received spent catalyst in 2-step bioleaching of A. niger. Fungal growth was not observed in 1-step bioleaching (for A. niger and P. sp), indicating metal toxicity to the fungal spores on direct contact with the catalyst.
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Mohammad Moydul Islam(HT050008H).pdf.pdf5.95 MBAdobe PDF



Page view(s)

checked on May 22, 2019


checked on May 22, 2019

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.