Article
Green & Sustainable Science & Technology
Yujie Peng, Xiaofei Wang, Liangliang Fan, Qi Zhang, Xian Cui, Xiaojie Tian, Qiuhao Wu, Kirk Cobb, Roger Ruan, Heng Tu, Jing Yang, Yunpu Wang
Summary: The study focused on finding a cleaner disposal method for polyolefin waste by utilizing continuous microwave pyrolysis with a dual-catalyst system. The dual-catalyzed trial showed a higher yield of condensate fractions and increased selectivity for monocyclic aromatic hydrocarbons (MAHs) compared to using a single catalyst. The CMP reactor also outperformed the batch microwave pyrolysis (BMP) reactor in terms of MAHs production.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Analytical
Xiangfei Xue, Jin Mi, Fanfan Huang, Jingyue Wang, Lanxin Chen, Jie Liang
Summary: Catalytic co-pyrolysis of biomass and plastic waste is a promising approach for producing renewable biofuels and value-added chemicals. However, because of their different pyrolysis behaviors, the synergy between biomass and plastic is limited, and low-yield aromatics are produced. A modified segmented catalytic co-pyrolysis technology was proposed to enhance the synergy between feedstocks.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Analytical
Yanhui Bin, Zhaosheng Yu, Meirong Li, Zigan Huang, Jinbo Zhan, Yanfen Liao, Anqing Zheng, Xiaoqian Ma
Summary: In this study, H-type multilamellar MFI nanosheets (HMMN) were used for catalytic reforming of municipal solid waste (MSW) and sawdust co-pyrolysis to produce high-value bio-oil. The results showed that HMMN exhibited high selectivity for monocyclic aromatic hydrocarbons (MAHs) and significantly reduced the content of oxygen-containing compounds (OCCs). The addition of MSW improved the pyrolysis behaviors of sawdust, promoting the formation of MAHs and reducing the relative yield of OCCs. HMMN had a catalytic effect on deoxygenation and aromatization reactions.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Chemistry, Applied
Seung Kyo Oh, Huiji Ku, Gi Bo Han, Byunghun Jeong, Jong-Ki Jeon
Summary: This study investigates the influence of platinum loading on the hydrogenation of polycyclic aromatic hydrocarbons (PAHs) in pyrolysis fuel oil (PFO) using Pt/gamma-Al2O3 catalysts for producing jet fuel. Catalyst characterization was carried out through nitrogen adsorption, temperature-programmed desorption of ammonia, and temperature-programmed reduction under hydrogen flow. The catalytic performance of bead-type Pt/gamma-Al2O3 catalysts in the hydrogenation of PAHs in PFO-cut was evaluated in a trickle-bed reactor. The main products of the hydrogenation reaction include decalin derivatives, alkylated cyclohexane, hexahydroindan derivatives, and bicyclohexyl. The Pt(1.0 wt%)/gamma-Al2O3 catalyst exhibited the highest activity and negligible deactivation over ten hours of time-on-stream.
Article
Thermodynamics
Yusuf H. Bello, Mahmoud A. Ahmed, Shinichi Ookawara, Ahmed E. Elwardany
Summary: An improved biomass conversion in a lab-scale fluidized bed reactor (FBR) is achieved by optimizing the air distributor orifice size and number. Different methods of introducing air yield different results in gas holdup, with increasing the orifice number showing positive effects on gas holdup.
Article
Construction & Building Technology
Dongsheng Li, Congliang Huang
Summary: A novel porous carbon material was developed from pressed and carbonized pine sawdust, showing excellent thermal insulation performance and environmental friendliness. The carbonized pine sawdust packed (CPP) bed exhibited low thermal conductivity, high porosity, hydrophobicity, reusability, and structural stability.
ENERGY AND BUILDINGS
(2022)
Article
Energy & Fuels
Jae-Wang Shim, Sumin Pyo, Su Shiung Lam, Jungho Jae, Byong-Hun Jeon, Moonis Ali Khan, Kun-Yi Andrew Lin, Young-Min Kim, Sang-Chul Jung, Young-Kwon Park
Summary: This study investigated the pyrolysis kinetics and product distribution of chicken manure through thermogravimetric analysis and pyrolyzer-gas chromatography/mass spectrometry. The results showed different decomposition reactions at different stages and the catalytic effect of acid catalysts on product formation.
Article
Chemistry, Analytical
Xiuhua Yang, Linyao Ke, Qiuhao Wu, Xian Cui, Qi Zhang, Xiaojie Tian, Yuan Zeng, Kirk Cobb, Yuhuan Liu, Roger Ruan, Yunpu Wang
Summary: The study shows that microwave-assisted pyrolysis is an efficient and fast method for producing aromatic bio-oil from spent bleaching clay (SBC). Compared to electric heating, microwave heating not only saves reaction time and energy consumption but also promotes the formation of aromatic hydrocarbons. The optimal pyrolysis conditions include a temperature of 500°C, a feedstock to catalyst mass ratio of 10/1, and a nitrogen flow rate of 50 mL/min.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Engineering, Environmental
Jingyi Liang, Chao Li, Lijun Zhang, Shu Zhang, Kuan Ding, Shuang Wang, Bin Li, Zhenhua Cui, Yonggui Tang, Xun Hu
Summary: Co-pyrolysis of mixed feedstocks is a common practice, but the interactions between volatiles from different sources remain a challenge. This study examined the impact of volatiles from one feedstock on the biochar of another feedstock during sequential pyrolysis, and found that it reduced oxygen/nitrogen-containing compounds and heavy pi-conjugated components in the bio-oils, increased biochar yields but decreased bio-oil yields, and made the biochars more hydrophobic and thermally stable.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Maryanne Chelang'at Mosonik, Roberto Volpe, Chinonso Ezenwajiaku, Midhat Talibi, Ramanarayanan Balachandran
Summary: This study investigated the impact of pyrolysis peak temperatures and holding period on the formation of PAHs from two lignocellulosic biomass samples. PAH PLIF signals appeared at around 275 degrees Celsius, with peak values for walnut shells at around 400 degrees Celsius and almond shells at around 375 degrees Celsius. These findings suggest potential improvements to reactor design based on temperature-dependent characteristics of PAH formation.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Evan Wiens, William L. H. Hallett, Rosalyn Skiffington
Summary: This paper introduces a simple technique for sampling individual fuel particles in overfeed packed bed combustion. The particles are secured to a thin stainless steel rod, which tracks their motion and removes them for sampling at desired times. Analysis of the tracked particles provides information on changes in mass, volume, density, and dimensions during combustion. Experiments on parallelepipedal wood particles show that shrinkage during pyrolysis is generally largest along the direction of the wood grain.
Article
Engineering, Environmental
Wenjie Ren, Haoran Liu, Tingyu Mao, Ying Teng, Rui Zhao, Yongming Luo
Summary: This study investigated the use of graphene oxide-immobilized bacterial pellets for the removal of polycyclic aromatic hydrocarbons (PAHs) from contaminated soil. The results showed that these immobilized bacterial pellets significantly improved the removal rate of PAHs and enhanced the abundance of degrading bacteria in the soil. They also enriched potential indigenous degrading bacteria and functional genes involved in PAHs degradation. Overall, this nanocomposite bacterial pellets provide a novel microbial immobilization option for remediating organic pollutants in harsh soil environments.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Scott V. Elgersma, Andrew J. Sederman, Michael D. Mantle, Constant M. Guedon, Gary J. Wells, Lynn F. Gladden
Summary: This study utilizes compressed sensing magnetic resonance methods to acquire full-field flow data in a packed bed system with non-spherical pellets, revealing interesting features of the flow dynamics, such as flow heterogeneity and the correlation between turbulent kinetic energy and time-averaged velocity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Yucheng Jiang, Chao Li, Lijun Zhang, Haisheng Lin, Shu Zhang, Yi Wang, Song Hu, Jun Xiang, Xun Hu
Summary: Microwave heating differs from furnace heating in terms of heat transfer and mechanism, leading to more pronounced pyrolysis and biochar production but less bio-oil yield. Microwave pretreatment enhances deoxygenation but limits the formation of micropores and pore structures due to increased aromatic degree.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiangtao Jiang, Niki Conner, Kaijun Lu, Jace W. Tunnell, Zhanfei Liu
Summary: Nurdles, also known as plastic resin pellets, are a major source of plastic pollution on beaches globally. This study collected nurdles from 24 sites in the coastal bend region of south Texas and investigated their morphologies and associated pollutants. The results showed variations in color, shape, polymer composition, and oxidation degree of the nurdles. PAHs and mercury were detected on nurdles at some sampling sites, indicating potential risks of pollutant exposure to marine organisms in ecosystems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)