The effect of temperature, heating rate, and ZSM-5 catalyst on the product selectivity of the fast pyrolysis of spent coffee grounds

Abstract

ARTICLEThis journal is Spent coffee grounds (SCG) are a continuously produced and abundant biomass resource that is rich in fixed carbon and underutilized. In this study, fast pyrolysis was employed as a method of upgrading this waste product into higher value chemicals and commodities. The effect of catalytic upgrading via a ZSM-5 catalyst on the pyrolysis product was investigated at two heating rates and three different pyrolysis temperatures. ZSM-5 catalyst was explored as the means to increase selectivity to deoxygenated olefins and aromatic products. The liquid products from the pyrolysis of SCG were predominantly fatty acids, linear hydrocarbons, furans, phenols, ketones, and aromatic hydrocarbons. The ZSM-5 catalyst was seen to decrease selectivity to linear hydrocarbons and furans, and enhance selectivity to aromatic hydrocarbons and CO. Increasing the pyrolysis temperature was seen to decrease selectivity to fatty acids, and increase selectivity to aromatic and linear hydrocarbons.

Bifunctional Ni‐ZSM‐5 Catalysts for the Pyrolysis and Hydropyrolysis of Biomass

“…[6] Zeolitesh ave been used as deoxygenationc atalysts because of their high acidity and characteristic shape-selective pore structure.O ft he possible candidates,Z SM-5 has been identified as the most promising. [7] Many studies with zeolite catalysts have focused on the optimizationo ft he process conditions,w hich include the pyrolysis temperature, [8] heating rate, [9] catalyst location (in situ vs.e xsitu), [10,11] residence time, [1] and feedstock, [12] but low bio-oil yields and high rates of coke and char formationc ontinue to impede the industrializationofb iomass catalytic fast pyrolysis (CFP).…”

Catalytic Conversion of Furan to Hydrocarbons using HZSM‐5: Coking Behavior and Kinetic Modeling including Coke Deposition

“…Catalytic fast pyrolysis (CFP) of biomass is a promising technology to convert solid biomass to high‐value fuels and chemicals . Oxygenates (e.g., furans, acids, aldehydes) are first formed from the initial decomposition of biomass and then catalytically converted on the catalysts to valuable hydrocarbons through a series of reaction steps . It requires special pore structure to realize high shape selectivity to hydrocarbons.…”

“…[1][2][3][4][5][6] Oxygenates (e.g.,f urans,a cids,a ldehydes) are first formed from the initial decomposition of biomass and then catalytically converted on the catalysts to valuable hydrocarbonst hrough as eries of reaction steps. [7][8][9] It requires special pore structure to realize high shape selectivityt oh ydrocarbons. Thea luminosilicate zeolite ZSM-5c atalyst has a3 -dimensionalp ore structure with pore size of 0.55-0.56 nm, which is close to molecular diameter of benzene, toluene, and xylene (BTX).…”

Development of Heterogeneous Catalysts for Thermo-Chemical Conversion of Lignocellulosic Biomass

“…The studies associated with the application of ZSM-5 are also focused on the determination of its catalytic performance in the decomposition of different feedstock or co-pyrolysis processes [12,[19][20][21][22][23]. Fisher et al [19] investigated the effect of the use of ZSM-5 catalyst on the course of fast pyrolysis of spent coffee grounds.…”

“…Fisher et al [19] investigated the effect of the use of ZSM-5 catalyst on the course of fast pyrolysis of spent coffee grounds. The experiments were performed in both a fixed bed reactor and a pyroprobe.…”