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- Title
Heterogeneous Catalysts from Metallic Oxides and Lignocellulosic Biomasses Ash for the Valorization of Feedstocks into Biodiesel: an Overview.
- Authors
Bekele, Demelash Tilahun; Shibeshi, Nurelegne Tefera; Reshad, Ali Shemsedin
- Abstract
Transesterifying various grade feedstocks is a way to reduce biodiesel production costs. Non-edible feedstocks are preferable. Feedstock blending also makes production flexible and economical. Transesterification is not feasible without having an effective and low-cost catalyst. Heterogeneous catalysts are found to be prioritized for simple and low-cost biodiesel production. Metal oxides are good candidates. Their use is well known and recent researches are concerned with developing methods to increase their activity, stability, and selectivity. Metal oxide blending and integrating with porous support are some of the methods. Ash derived from lignocellulosic biomass is also being studied as a relatively cheap and environmentally benign heterogeneous catalyst. Based on its composition, it can be considered as a supported mixed oxide catalyst. Its composition strongly depends on the inorganic chemical makeup of the lignocellulosic biomass and synthesis (mainly calcination) conditions. Alkali metal compounds–rich and silica-rich ashes can be employed as alkali catalysts and active site support respectively. This review intends to give an overview of the metallic oxide and lignocellulosic biomass ash-based catalysts that were examined for the transesterification of diverse feedstocks into biodiesel.
- Subjects
HETEROGENEOUS catalysts; METALLIC oxides; LIGNOCELLULOSE; MIXED oxide catalysts; INORGANIC compounds; ALKALI metals
- Publication
BioEnergy Research, 2023, Vol 16, Issue 3, p1361
- ISSN
1939-1234
- Publication type
Article
- DOI
10.1007/s12155-022-10546-7