Abstract
Abstract Renewable biomass resources have become increasingly attractive in recent years. In this study, the pyrolysis of waste navel orange peels was carried out with different metal oxides (Cu2O, CaO, V2O5, Fe2O3, and ZnO) in a tube furnace to obtain high-quality bio-oil, from which high-value chemicals such as 3-furaldehyde could be well recovered to enhance the economic value of waste navel orange peels. The effects of different metal oxides on bio-oil were analyzed by GC/MS. The results showed that Cu2O and Fe2O3, as catalysts for slow pyrolysis, promoted the production of 3-furaldehyde compounds at a scale of approximately 5.69 and 4.82 times higher than that of pyrolysis without the addition of metal oxides, respectively. High-value chemicals such as 3-furaldehyde obtained from bio-oil can enhance the economic value of waste navel orange peels for full recovery and reuse.
Highlights
Renewable biomass resources have become increasingly attractive in recent years
In this work, (i) we explore the effect of several metal oxides on the yield of navel orange peel pyrolysis products at suitable temperatures; (ii) we characterize the effect of different metal oxides on bio-oil composition and analyze their differences to determine their respective advantages; and (iii) we characterize the effect of different metal oxides on gas product composition
Thermogravimetric analysis (TGA) was used to determine the weight loss of the biomass sample according to the following procedure: 20 mg of navel orange peels were heated at 10°C·min−1 from 25°C to 800°C in 60 mL·min−1 Ar and held at 800°C for 30 min to remove all volatiles
Summary
Abstract: Renewable biomass resources have become increasingly attractive in recent years. Preparation of bio-oil by catalytic pyrolysis of orange peel 219 effective in converting microalgae [11] and oil palm shell [12] into biofuels These biomass materials are thermally cracked and decomposed in an inert environment to produce pyrolysis products comprising biochar, bio-oil, and gases containing H2, syngas, and light gaseous hydrocarbons. Bio-oil, which is a pyrolysis product, is usually a dark brown organic flowing liquid that has a higher calorific value than the raw material and can be stored and transported It can be used in the production of chemicals and is a possible replacement for fuel oils for heating or power generation in many stationary applications [17]. Considering that metal oxides show good performance in pyrolysis of biomass, this article proposes the use of metal oxide catalysts to slowly pyrolyze waste navel orange peels to produce high grade bio-oil to add value to the waste navel orange peels. In this work, (i) we explore the effect of several metal oxides on the yield of navel orange peel pyrolysis products at suitable temperatures; (ii) we characterize the effect of different metal oxides on bio-oil composition and analyze their differences to determine their respective advantages; and (iii) we characterize the effect of different metal oxides on gas product composition
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