Abstract
Two series of bimetallic Ni-Co catalysts and corresponding monometallic catalysts with ca. 20 wt% metal loading were evaluated in hydrodeoxygenation (HDO) of phenol as a model compound for bio-oil. The bimetallic catalysts outperformed the corresponding monometallic catalyst in terms of conversion and cyclohexane selectivity. This could be attributed to the formation of Ni-Co alloy, which caused a decrease in metal particle size and stabilized Ni active sites in the near surface region. The balanced combination of formed Ni-Co alloy with acidity from supports allowed performing all individual steps in the reaction network toward desired products at high rate. Consequently, the two best-performing catalysts were tested in HDO of wood based bio-oil, showing that the bimetallic catalyst 10Ni10Co/HZSM-5 was more effective than 20Ni/HZSM-5 in terms of degree of deoxygenation and upgraded bio-oil yield. These findings might open an opportunity for development of a novel cheap but effective catalyst for a key step in the process chain from biomass to renewable liquid fuels.
Highlights
Energy and environmental issues are two common concerns of modern society
We have recently studied bimetallic Ni-Co and Ni-Cu-containing catalysts using HZSM-5 as carrier for aqueous phase HDO of phenol as a model compound for bio-oil to overcome the discussed drawbacks [25]
This study presents results from aqueous phase HDO over various supported transition metal-containing catalysts with phenol as a model compound for screening purpose
Summary
Energy and environmental issues are two common concerns of modern society. Worldwide energy consumption. The catalyst material should be resistant to coking and heteroatoms in bio-oil in order to increase the catalyst lifetime For this purpose, we have recently studied bimetallic Ni-Co and Ni-Cu-containing catalysts using HZSM-5 as carrier for aqueous phase HDO of phenol as a model compound for bio-oil to overcome the discussed drawbacks [25]. We have recently studied bimetallic Ni-Co and Ni-Cu-containing catalysts using HZSM-5 as carrier for aqueous phase HDO of phenol as a model compound for bio-oil to overcome the discussed drawbacks [25] From these previous studies, a 10 wt% Ni + 10 wt% Co supported on HZSM-5 catalyst revealed best performance [25]. The transfer from the model reaction to conversion of bio-oil was performed afterwards with the best-performing catalysts to shed some light on the catalyst performance in real feed and the comparability of model and real reactions
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