In Situ and Ex Situ Catalytic Co-pyrolysis of Lignocellulosic Biomass and Plastics (Low-Density and High-Density Polyethylene) Using Spent FCC Catalyst

Catalytic co-pyrolysis of biomass and plastics (low-density and high-density polyethylene) was conducted utilizing spent fluid‐catalytic‐cracking catalyst. The effect of pyrolysis type (in situ vs. ex situ) on product yield and selectivity was tested at feed ratios of 1:2, 1:1, and 2:1 (w/w). The ex...

Full description

Saved in:
Bibliographic Details
Published in:Waste and biomass valorization 2023-05, Vol.14 (5), p.1737-1751
Main Authors: Kanduri, Praveen Kumar, Seethamraju, Srinivas
Format: Article
Language:English
Subjects:
Benzene
Biomass
Catalysts
Catalytic cracking
Char formation
Configurations
Engineering
Environment
Environmental Engineering/Biotechnology
Fluid catalytic cracking
High density polyethylenes
Hydrogen
Industrial Pollution Prevention
Lignocellulose
Original Paper
Plastics
Polycyclic aromatic hydrocarbons
Polyethylene
Pyrolysis
Renewable and Green Energy
Toluene
Waste Management/Waste Technology
Xylene
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Catalytic co-pyrolysis of biomass and plastics (low-density and high-density polyethylene) was conducted utilizing spent fluid‐catalytic‐cracking catalyst. The effect of pyrolysis type (in situ vs. ex situ) on product yield and selectivity was tested at feed ratios of 1:2, 1:1, and 2:1 (w/w). The ex situ configuration improved the bio-oil quality and produced substantially high gas and low char yields than the in situ configuration. The bio-oil from ex situ processes had more oxygen-free monoaromatics with a maximum yield of ~ 29%C and ~ 26%C for low‐density and high‐density polyethylene at the biomass to plastic ratios of 2 and 1, respectively. The feed containing more biomass resulted in a higher selectivity towards monoaromatics (including benzene, toluene, and xylene) and polycyclic aromatic hydrocarbons, regardless of the configuration type. Compared to biomass pyrolysis, co-feeding plastics with biomass enriched the hydrogen content of the bio-oil with the ex situ processes producing more fungible products than the in situ processes. The effective H/C ratio in the bio-oils improved from ~ 0.19 to > 1.0 for the biomass-plastic mixtures compared to biomass pyrolysis alone. This is so as the plastics are hydrogen rich (H/C ratio of 2) compared to biomass, and the increased hydrogen availability during pyrolysis reactions improves the bio-oil quality and simultaneously reduces the char formation. Graphical Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-022-01961-0