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- Title
Valorization of Pyrolyzed Biomass Residues for the Transformation of Waste Cooking Oil into Green Diesel.
- Authors
Nikolopoulos, Ioannis; Kordouli, Eleana; Mourgkogiannis, Nikolaos; Karapanagioti, Hrissi K.; Lycourghiotis, Alexis; Kordulis, Christos
- Abstract
This study aims to utilize biochars derived from residual biomass as supports for Ni-based catalysts. For the preparation of the biochars, byproducts of agro-industrial activities were used, such as espresso coffee residue (C) and rice husks (R). Sufficient quantities of the respective biochars (BioC and BioR) were prepared via pyrolysis at 850 °C of the aforementioned materials under limited oxygen conditions. The biochars were further treated with hot water (WBioC, WBioR), H3PO4 or H2SO4 solution (BioC-P, BioC-S, BioR-P, BioR-S), and NaOH solution (BioC-A and BioR-A), and the obtained solids were characterized using various physicochemical techniques. The biochars produced were microporous with high surface areas (367–938 m2g−1). The most promising biochars were selected as supports for the preparation of nickel catalysts (10 wt.% Ni) with high Ni dispersion (mean crystal size: 8.2–9.8 nm) and suitable acidity. The catalysts were evaluated in a high-pressure semi-batch reactor for the transformation of waste cooking oil (WCO) into green diesel. The 10Ni_BioC-P catalyst exhibited the best performance, resulting in a complete conversion of the WCO but a low hydrocarbon yield (7.5%). Yield improvement was achieved by promoting this catalyst with molybdenum. The addition of Mo increased the hydrocarbon yield by almost three times (19.5%).
- Subjects
EDIBLE fats &; oils; GREEN diesel fuels; NICKEL catalysts; MOLYBDENUM catalysts; CATALYST supports; DIESEL motors; HYDROCRACKING; DIESEL fuels; BIOCHAR
- Publication
Catalysts (2073-4344), 2023, Vol 13, Issue 6, p1004
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal13061004