Intensification of co-pyrolysis of plastic with biomass via pretreatment

Muhammad, Ishaka; Manos, George

doi:10.1016/j.psep.2020.11.042

Cited by 19 publications

(23 citation statements)

References 52 publications

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“…Higher reaction temperature supports the easy cleavage of bonds, thereby promoting the catalytic cracking of heavier fraction and the suppression of alkylation reactions [80]. Similar results were reported by Wong et al [81] and Muhammad and Manos [56] where the increase in reaction temperature caused further cracking of oligomers to form smaller hydrocarbons and increase the lighter fraction.…”

Section: The Effect Of Pre-treatment (Co-pressing Method) On the Boiling Point Distribution Of The Bio-oil From Catalytic Pyrolysis Of Hesupporting

confidence: 76%

“…The product yields from catalytic pyrolysis of lignin has been improved through co-pressing method resulting in higher liquid yield and lower coke/char yield respectively. Muhammad and Manos [56] reported an increase in liquid yield from 41.5% to 52.0% and decrease in coke/char yield from 25.0% to 26.0% for un-treated and co-pressed cellulose with USY, studied at 723 K and 10 mL N /min flow rate. The liquid yield from this study showed the same effect as presented in Figure 3, while the coke/char yield of the co-pressed sample has increased due to the lower N 2 flow rate in the latter study, which has increased the residence time of the volatiles in the reactor.…”

Section: Pyrolysis Reactor Experiments 221 the Effect Of Co-pressing Pre-treatment Methods On Liquid Product Yieldsmentioning

confidence: 99%

“…This can be attributed to further conversion of cellulose char in the presence of USY, resulting in more volatiles components that were partly transformed into thermal coke. Co-pressed cellulose produced more hard coke compared to normal mixing because of the intimate contact it provides between the cellulose and USY, which enhanced not only its pyrolysis but its coke formation too [56]. Higher catalytic effect of the co-pressed sample at lower reaction temperature also leads to the lower formation of coke/char as shown by the coke concentration (Table 1).…”

Section: Coked/charred Catalyst Characterizationmentioning

confidence: 99%

“…As shown in Table 1, HY has higher surface area and acid density. The higher acid density obviously influences its higher initial degradation performance but the frequent deactivation and poor thermal stability are the main drawbacks in its application [42,56,61,62]. On the other hand, USY is the modified form of Y zeolite which exhibits very strong acidic sites [63,64], mesoporous system [64,65] and high thermal stability [62][63][64][65].…”

Section: Liquid Product Characterisationmentioning

confidence: 99%

“…They reported higher amounts of polycyclic aromatic hydrocarbons from catalytic pyrolysis of cellulose. The slow diffusion of the main products from cellulose thermal decomposition into the HY pores [69,71] due to coke/char deposition has also contributed to the higher amount of heavy fraction obtained [56]. However, USY was able to allow further cracking of the products and the boiling point distribution was shifted to middle fraction in consistency with its stronger acid sites, thus suggesting a more extended degree of conversion.…”

Section: Liquid Product Characterisationmentioning

confidence: 99%

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Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Muhammad

Manos

2021

Catalysts

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Biomass pyrolysis is a promising technology for fuel and chemical production from an abundant renewable source. It takes place usually in two stages; non-catalytic pyrolysis with further catalytic upgrading of the formed pyrolysis oil. The direct catalytic pyrolysis of biomass reduces the pyrolysis temperature, increase the yield to target products and improves their quality. However, in such one-stage process the contact between biomass and solid catalyst particles is poor leading to an excessively high degree of pure thermal pyrolysis reactions. The aim of this study was to enhance the catalyst-biomass contact via co-pressing of biomass and catalyst particles as a pre-treatment method. Catalytic pyrolysis of biomass components with HY and USY zeolites was studied using thermogravimetric analysis (TGA), as well as experiments in a pyrolysis reactor. The liquid and coke yields were characterized using gas chromatography, and TGA respectively. The TGA results showed that the degradation of the co-pressed cellulose occurred at lower temperatures compared to the pure thermal degradation, as well as catalytic degradation of non-pretreated cellulose. All biomass components produced better results using the co-pressing method, where the liquid yields increased while coke/char yields decreased. Bio-oil from catalytic pyrolysis of cellulose with HY catalyst mainly produced heavier fractions, while in the presence of USY catalyst medium fraction was mainly produced within the gasoline range. For hemicellulose catalytic pyrolysis, the catalysts had similar effects in enhancing the lighter fraction, but specifically, HY showed higher selectivity to middle fraction while USY has produced higher percentage of lighter fraction. Using with both catalysts, co-pressing had the best effect of eliminating the heavier fraction and improving the gasoline range fraction. Spent catalyst from co-pressed sample had lower concentrations of coke/char components due to the shorter residence times of volatiles, which suppresses the occurrence of secondary reactions leading to coke/char formations.

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Section: The Effect Of Pre-treatment (Co-pressing Method) On the Boiling Point Distribution Of The Bio-oil From Catalytic Pyrolysis Of Hesupporting

confidence: 76%

Section: Pyrolysis Reactor Experiments 221 the Effect Of Co-pressing Pre-treatment Methods On Liquid Product Yieldsmentioning

confidence: 99%

Section: Coked/charred Catalyst Characterizationmentioning

confidence: 99%

Section: Liquid Product Characterisationmentioning

confidence: 99%

Section: Liquid Product Characterisationmentioning

confidence: 99%

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Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Muhammad

Manos

2021

Catalysts

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Thermal degradation of emerging pollutants in municipal solid wastes and agro wastes: effectiveness of catalysts and pretreatment for the conversion of value added products

Chandrasekran,

Ahalya,

Pamila

et al. 2024

Discov Appl Sci

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In this study, emerging soil pollutants in the form of municipal solid waste (MSW) and agricultural waste were converted into biofuel via thermal degradation process. Among various waste-to-energy conversion processes, the pyrolysis of biomass is considered the most significant due to its maximum biofuel yield than other conversion techniques. Individual and co-pyrolysis of MSW and sugarcane residue (SR) as well as its treated variant (TSR) were performed in a lab-setup fixed-bed reactor with and without catalyst. The effect of acid pretreatment and catalytic effects on the pyrolysis process was assessed in terms of product yields and characterization. The acidic pretreatment of SR and catalyst in the pyrolysis process alters the process yield and its composition. The maximum oil yield of 50.5 wt% was achieved by catalytic co-pyrolysis of MSW + TSR + HZSM5, whereas the maximum gas yield of 38.1 wt% was achieved by catalytic co-pyrolysis of MSW + SR + HZSM5. This suggests that intrinsic minerals present in the biomass and MSW, particularly alkali and alkaline earth metals, have a catalytic effect on the devolatilization of organic material and the char cracking event. The pretreatment of biomass showed considerable improvement in the properties of the produced pyrolysis oil and char. Compared to the pyrolysis oil and char obtained from MSW + SR, the oil and char obtained from MSW + TSR + HZSM5 showed a small increment in their heating values. Pretreatment and the catalytic co-pyrolysis process influenced the structure of the pyrolysis oils, increasing the production of phenolic compounds and aromatic hydrocarbons. The amount of gas components in pyrolysis gas, such as CH4, CO2, and CO also changed more according to the feedstock used for the process. Overall, the HZSM-5 catalyst and co-pyrolysis of MSW with pretreated SR enhanced the pyrolysis conversion of waste municipal solids and agricultural wastes into energy-rich products.

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Co-pyrolysis of biomass and waste plastics for production of chemicals and liquid fuel: A review on the role of plastics and catalyst types

Zulkafli

Hassan²,

Ahmad³

et al. 2023

Arabian Journal of Chemistry

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Intensification of co-pyrolysis of plastic with biomass via pretreatment

Cited by 19 publications

References 52 publications

Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Improving the Conversion of Biomass in Catalytic Pyrolysis via Intensification of Biomass—Catalyst Contact by Co-Pressing

Thermal degradation of emerging pollutants in municipal solid wastes and agro wastes: effectiveness of catalysts and pretreatment for the conversion of value added products

Co-pyrolysis of biomass and waste plastics for production of chemicals and liquid fuel: A review on the role of plastics and catalyst types

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