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Title: Fungal bioleaching of spent hydroprocessing catalyst: Effect of decoking and particle size
Authors: Islam, M.
Ting, Y.P. 
Keywords: Aspergillus niger
Metal recovery
Spent catalyst
Issue Date: 2009
Source: Islam, M.,Ting, Y.P. (2009). Fungal bioleaching of spent hydroprocessing catalyst: Effect of decoking and particle size. Advanced Materials Research 71-73 : 665-668. ScholarBank@NUS Repository.
Abstract: This work reports on the bioleaching of spent NiMo catalyst using Aspergillus niger. As-received and decoked catalysts of various sizes (as-received, 180-120 μm, 120-45 μm and <45 μm) were examined. Chemical analysis of the spent catalyst confirmed the presence of heavy metals including Al (38.2%), Ni (3.36%), and Mo (12.9%). SEM-EDX analysis revealed a change in the metal distribution within the spent catalyst following the decoking process. In one-step bioleaching where the fungus was inoculated together with the catalyst, fungal growth was not observed. In 2-step bioleaching where the catalyst was added three days after the start of the fungal incubation, the highest Mo (87.3%) and Al (17.20%) leaching efficiencies were obtained from the catalyst of smallest particle size (i.e. decoked grounded; <45μm) while the highest Ni leaching efficiency (94%) was achieved from the as-received spent catalyst. © (2009) Trans Tech Publications.
Source Title: Advanced Materials Research
ISBN: 0878493220
ISSN: 10226680
Appears in Collections:Staff Publications

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