Abstract
To delve into the law of hydrocarbon production in microwave-assisted catalytic fast pyrolysis (MACFP) of corn straw, physical mixed Mesoporous Crystalline Material-41 (MCM-41) and Zeolite Socony Mobile-5 (ZSM-5) catalyst prototypes were exploited in this study. Besides, the effects exerted by temperature of reaction and MCM-41/ZSM-5 mass ratio were explored. As revealed from the results, carbon outputs of hydrocarbons rose initially as the temperature of MACFP rose and reached the maximal data at 550 °C; subsequently, it declined as reaction temperature rose. Moreover, the MCM-41/ZSM-5 mass ratio of 1:2 was second-to-none for hydrocarbon formation in the course of biomass MACFP. It was reported that adding MCM-41 can hinder coke formation on ZSM-5. Furthermore, MCM-41/ZSM-5 mixture exhibited more significant catalytic activity than ZSM-5/MCM-41 composite, demonstrating that hydrocarbon producing process can be stimulated by a simple physical MCM-41 and ZSM-5 catalysts mixture instead of synthesizing complex hierarchically-structured ZSM-5/MCM-41 composite.
Highlights
Over the past few years, energy consumption and environmental pollution have risen remarkably, so renewable energy should be developed to tackle energy and environmental issues [1]
The product distribution from microwave-assisted catalytic fast pyrolysis (MACFP) of corn stalk is shown in Figure 1 as a function of temperature
The maximal carbon output of overall petrochemicals (17.1%) and minimum carbon output of unidentified oxygenates (11.0%) were obviously obtained at a temperature of MACFP of 550 ◦ C, suggesting that 550 ◦ C is the optimal temperature for MACFP of corn stalk to maximize hydrocarbon output
Summary
Over the past few years, energy consumption and environmental pollution have risen remarkably, so renewable energy should be developed to tackle energy and environmental issues [1]. Catalytic fast pyrolysis (CFP) refers to an emerging and promising thermochemical conversion technique to yield liquid fuels (termed bio-oil) from biomass in the absence of oxygen [8,9,10], combining fast pyrolysis and zeolitic catalyst and allowing for biomass volume reduction and high-quality bio-oil production. It is noteworthy that the zeolitic catalyst is employed to expel oxygen and facilitate hydrocarbon formation during CFP [11], which improves bio-oil quality. Over the past few decades, numerous microporous and mesoporous catalysts have been screened and assessed for biomass CFP transformation [12,13], and it is identified that ZSM-5 catalyst optimally contributes to hydrocarbon production for its great deoxygenating capacity [14,15,16]. The inner pore structure of ZSM-5 is characterized by the straight 0.53 × 0.56 nm channels connected with zigzag
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