Article
Chemistry, Applied
Tao Jin, Hongtao Wang, Jiebang Peng, Yushan Wu, Zhen Huang, Xin Tian, Mingyue Ding
Summary: This study investigated the feasibility of using metal-modified HZSM-5 zeolite as catalysts for monocyclic aromatic hydrocarbons production in lignin catalytic pyrolysis. The 1%Co-HZ catalyst showed excellent performance and resistance to carbon deposition.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xiang Guo, Huijun Yang, Terrence Wenga, Rui Zhang, Bin Liu, Guanyi Chen, Li'an Hou
Summary: Modified HZSM-5 catalysts with metallic impregnation showed reduced oxygenates and nitrogen-containing compounds in bio-oil, while enhancing selectivity towards aromatics, especially monocyclic aromatic hydrocarbons. Among them, Mo-M/HZSM-5 exhibited the best deoxygenation potential, denitrification, and highest content of MAHs. Mo-Zn/HZSM-5 was identified as a superior catalyst for decreasing oxygen content and increasing calorific value in bio-oil.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Amin Osatiashtiani, Jiajun Zhang, Stylianos D. Stefanidis, Xiaolei Zhang, Anthony V. Bridgwater
Summary: This study investigates the decomposition mechanism of the key cellulose pyrolysis intermediate, levoglucosan, in biomass catalytic fast pyrolysis. Experimental results show that furan and furfural are key intermediates in the formation of aromatic hydrocarbons. Theoretical modelling reveals a direct pathway from levoglucosan to furan without furfural as an intermediate.
Article
Chemistry, Applied
Zhen Wan, Zhihe Li, Guo Li, Weiming Yi, Andong Zhang, Tawaf Ali Shah, Shaoqing Wang
Summary: In this study, composite catalysts were synthesized using HZSM-5 and calcined spent bleaching clay (CSBC) for upgrading lignin with spent bleaching clay (SBC) co-pyrolysis vapors. The addition of CSBC converted the coke of HZSM-5 into oxygenated coke, benefiting the catalysts regeneration. The pore structure and acidity of the catalysts were affected by the coke, and soluble coke on the catalyst was mainly composed of long-chain alkanes and oxygenated aromatic compounds. The modulation of HZSM-5 by CSBC inhibited the polymerization of these compounds, improving the selectivity and stability of the catalyst.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Engineering, Environmental
Soheil Valizadeh, Sumin Pyo, Young-Min Kim, Hanie Hakimian, Young -Kwon Park
Summary: Catalytic pyrolysis of cow manure using HZSM-5, HBeta, and HY zeolites was conducted, and HZSM-5 showed the highest production efficiency of benzene, toluene, ethylbenzene, xylene, and naphthalene. The acidity and pore structure of the catalysts played a crucial role in the efficiency. Increasing the acidity, reaction temperature, and catalyst-to-feedstock ratio further increased the production of BTEXN and decreased oxygen-containing compounds.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Miriam Arabiourrutia, Gmar Bensidhom, Maider Bolanos, Aida Ben Hassen Trabelsi, Martin Olazar
Summary: This study investigates the catalytic pyrolysis of date palm seeds and finds that HZSM-5 zeolite promotes the production of incondensable gases and aromatic hydrocarbons, while dolomite catalyst increases the content of ketones.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Agricultural Engineering
Shaoqing Wang, Zhihe Li, Weiming Yi, Peng Fu, Xueyuan Bai
Summary: This study demonstrates the successful use of a tailored hierarchical zeolite catalyst for the catalytic pyrolysis of corn cob lignin, resulting in the production of value-added aromatic hydrocarbons. The hierarchical zeolite allows for the regulation of aromatic hydrocarbon components, improves catalytic stability, and reduces coke formation. This research is of great importance for practical applications.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Energy & Fuels
Huiyan Zhang, Bingbing Luo, Kai Wu, Bo Zhao, Jiajun Yu, Siyu Wang, Yujie Tao
Summary: The ex-situ catalytic pyrolysis of lignin using LC catalysts combined with HZSM-5 can enhance the aromatic yield. LC catalysts prepared under optimal conditions show excellent depolymerization performance for both lignin and biomass. The total aromatic yield is significantly improved by using the optimal LC catalyst combined with HZSM-5, and LC catalysts have good renewability.
Article
Biochemistry & Molecular Biology
Zhen Li, Huihui Zhang, Deshi Yang, Zhipeng Hu, Fengqiang Wang, Zhijun Zhang
Summary: A niobium-doped HZSM-5 catalyst (H[Nb]ZSM-5) was synthesized and characterized. The results showed that H[Nb]ZSM-5 can efficiently and selectively convert lignin into monoaromatic hydrocarbons, reducing the phenol content compared to control HZSM-5.
Article
Green & Sustainable Science & Technology
Shaoqing Wang, Zhihe Li, Weiming Yi, Peng Fu, Andong Zhang, Xueyuan Bai
Summary: This study successfully increased the production of mono-aromatic hydrocarbons (MAHs) and inhibited the formation of poly-aromatic hydrocarbons (PAHs) in the catalytic pyrolysis of lignin by combining Al-SBA-15 and HZSM-5.
Article
Energy & Fuels
Witchakorn Charusiri, Naphat Phowan, Tharapong Vitidsant
Summary: This study investigates the influence of copyrolysis operating conditions and copper doping on the product distribution of sugarcane leaves (SCLs) and low-density polyethylene (LDPE) pyrolysis. The results show that there is a synergistic effect on liquid yield when co-pyrolyzing biomass-plastic mixtures. However, the experimental yield of noncondensable gas is higher than the theoretical yield at high temperature. Moreover, the amount of copper doped into HZSM-35 has an insignificant effect on the product yield.
Article
Energy & Fuels
Donghong Zhang, Tao Jin, Jiebang Peng, Jingjing Ma, Jianli Zhang, Xin Tian, Mingyue Ding
Summary: In this study, HZSM-5 zeolites with different micro/mesoporous morphology were synthesized via the green and energy-efficient in-situ synthesis method. The synthesized HZSM-5 catalyst showed higher selectivity for monocyclic aromatics production during lignin catalytic pyrolysis compared to commercial HZSM-5. Furthermore, the introduction of cobalt impregnation into the catalyst improved the structural property and acidity, resulting in increased generation of monocyclic aromatics and good stability in catalytic lignin pyrolysis.
Article
Chemistry, Physical
Xinghua Liu, Cunhao Cui, Haoran Liu, Linyu Zhu, Wenhao Yuan, Yanan Zhu, Zhongyue Zhou, Fei Qi
Summary: The TCCA mechanism of guaiacol with ammonia over HZSM-5 was investigated, and it was found that the formation of methylamine and aminophenol below 400°C is attributed to the strong adsorption of ammonia on the active site of HZSM-5, while aniline is the major product above 400°C coproduced with pyrroles and pyridines. The reactions among radical intermediates and molecules lead to poor aniline selectivity, and hydroamination is proposed as the main formation mechanism of pyrroles and pyridines. The maximum yield of aniline can be achieved at 650°C.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Xinghua Liu, Cunhao Cui, Haoran Liu, Linyu Zhu, Wenhao Yuan, Yanan Zhu, Zhongyue Zhou, Fei Qi
Summary: The thermal-catalytic conversion and amination of lignin over zeolites is a promising method to produce aromatic amines, but the exact mechanism of this process is still unclear. In this study, the TCCA mechanism of guaiacol with ammonia over HZSM-5 was investigated, and various products including amines, pyrroles, and pyridines were identified. The formation of methylamine and aminophenol was attributed to the strong adsorption of ammonia on the active site of HZSM-5, while aniline was the major product above 400 degrees C, produced through reactions among radical intermediates and molecules. The formation of pyrroles and pyridines was proposed to be mainly through hydroamination. The maximum yield of aniline was achieved at 650 degrees C.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Environmental Sciences
Min-Ji Ha, Jung Eun Lee, Y. Park, Jin Sun Cha, Young-Min Kim, Beom-Sik Kim
Summary: The catalytic ozonation of methylethylketone (MEK) was investigated using synthesized Mn and Cu-loaded ZSM-5 catalysts. Different catalysts were studied for the removal of MEK and ozone, and 5 wt% Mn/ZSM-5 and 5Mn1CuZSM showed the highest efficiency, respectively. The 5Mn1CuZSM catalyst exhibited superior catalytic reactivity for ozone conversion and CO2 selectivity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Thermodynamics
Si Woo Han, Jeong Jae Lee, Diyar Tokmurzin, Seok Hyeong Lee, Ji Young Nam, Sung Jin Park, Ho Won Ra, Tae-Young Mun, Sang Jun Yoon, Sung Min Yoon, Ji Hong Moon, Jae Goo Lee, Young-Min Kim, Young Woo Rhee, Myung Won Seo
Summary: The study investigated the air gasification properties of SRF with high content of residual mixed waste plastic in a lab scale bubbling fluidized bed gasifier. The results showed that gas yield increases and tar yield decreases as the operating temperature and air-to-fuel equivalence ratio (ER) increases, with changes in the concentration of various gases in the gas product. The H2/CO ratio increases with rising temperature and decreases with rising ER, while carbon conversion efficiency (CCE) and cold gas efficiency peak at 800 degrees C and ER of 0.25.
Article
Thermodynamics
Hanie Hakimian, Sumin Pyo, Young-Min Kim, Jungho Jae, Pau Loke Show, Gwang Hoon Rhee, Wei-Hsin Chen, Young-Kwon Park
Summary: This study investigated the catalytic pyrolysis of cellulose with oil sludge as a co-feeding feedstock, with Ni/HZSM-5 catalyst showing the best cracking and BTEXs formation effect. The experimental BTEXs yields were higher than theoretical values over all catalysts, indicating a synergistic effect. Highest synergistic effect was observed when 1/3 of cellulose/oil sludge mixture was used as the feedstock.
Article
Engineering, Environmental
Abid Farooq, Jechan Lee, Hocheol Song, Chang Hyun Ko, Im-Hack Lee, Young-Min Kim, Gwang Hoon Rhee, Sumin Pyo, Young-Kwon Park
Summary: This study introduces a method to valorize hazardous waste like used COVID-19 face masks through catalytic gasification using Ni-loaded ZSM-5 type zeolites. The research found that 25% Ni loading on ZSM-5 is optimal for H-2 production. Using steam as gasifying agent can reduce the content of N-containing species in the gasification product, potentially hazardous air pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Sumin Pyo, Jechan Lee, Young-Min Kim, Youna Park, Im Hack Lee, Yong Jun Choi, Gwang Hoon Rhee, Sang-Chul Jung, Young-Kwon Park
Summary: Catalytic fast co-pyrolysis with HZSM-5 and LLDPE effectively upgrades BHO to less hazardous fuel, with DeHZSM-5 showing enhanced hydrocarbon production and reduced content of toxic compounds. The study experimentally validates the feasibility of this approach for bio-heavy oil conversion.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Jin Sun Cha, Young-Min Kim, Im Hack Lee, Yong Jun Choi, Gwang Hoon Rhee, Hocheol Song, Byong-Hun Jeon, Su Shiung Lam, Moonis Ali Khan, Kun-Yi Andrew Lin, Wei-Hsin Chen, Young-Kwon Park
Summary: This study investigated the catalytic ozone oxidation of hazardous toluene using sawdust char (SDW) as a catalyst. The catalyst properties and their effects on toluene removal were analyzed, and it was found that the improved MnOx/SDC-K3 catalyst exhibited higher removal efficiency.
ENVIRONMENTAL POLLUTION
(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
Environmental Sciences
Hanie Hakimian, Soheil Valizadeh, Young-Min Kim, Young-Kwon Park
Summary: This research investigated the catalytic pyrolysis of oil sludge using metal-loaded HZSM-5 catalysts to produce value-added aromatics. Results showed that Ni-loaded HZSM-5 catalyst had the highest yield of BTEXs and other aromatics. Increasing the reaction temperature and catalyst amount also improved the yield.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Soheil Valizadeh, Sumin Pyo, Young-Min Kim, Hanie Hakimian, Young -Kwon Park
Summary: Catalytic pyrolysis of cow manure using HZSM-5, HBeta, and HY zeolites was conducted, and HZSM-5 showed the highest production efficiency of benzene, toluene, ethylbenzene, xylene, and naphthalene. The acidity and pore structure of the catalysts played a crucial role in the efficiency. Increasing the acidity, reaction temperature, and catalyst-to-feedstock ratio further increased the production of BTEXN and decreased oxygen-containing compounds.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Min-Ji Ha, Jung Eun Lee, Y. Park, Jin Sun Cha, Young-Min Kim, Beom-Sik Kim
Summary: The catalytic ozonation of methylethylketone (MEK) was investigated using synthesized Mn and Cu-loaded ZSM-5 catalysts. Different catalysts were studied for the removal of MEK and ozone, and 5 wt% Mn/ZSM-5 and 5Mn1CuZSM showed the highest efficiency, respectively. The 5Mn1CuZSM catalyst exhibited superior catalytic reactivity for ozone conversion and CO2 selectivity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Yujin Hwang, Young -Min Kim, Jung Eun Lee, Gwang Hoon Rhee, Pau-Loke Show, Kun -Yi Andrew Lin, Young-Kwon Park
Summary: Removal of harmful volatile organic compounds (VOCs), such as 2-butanone, emitted from industrial plants is crucial for clean air. Recycling porous spent fluid catalytic cracking (SFCC) catalysts from petroleum refineries can reduce waste and reuse resources. Mn-Cu/SFCC and Mn/SFCC catalysts exhibited superior catalytic efficiency in the ozonation of 2-butanone compared to other catalysts studied. The improved distribution of Mn3+ species and O-vacancy sites in Mn/SFCC and Mn-Cu/SFCC catalysts enhanced their catalytic activity for 2-butanone and ozone removal.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Cheolwoo Park, Eun-Suk Jang, Young-Min Kim
Summary: The effects of temperature on the product quality of wood pellet torrefaction were studied. Increasing the torrefaction temperature resulted in a decrease in solid yield and an increase in gas and liquid yield due to the elimination and decomposition of hemicellulose, cellulose, and lignin. The heating value of the wood pellets increased, but overall energy recovery efficiency decreased. The torrefied wood pellets exhibited improved hydrophobicity and decreased moisture absorption. Low-temperature torrefaction produced typical pyrolyzates of hemicellulose and cellulose, while high-temperature torrefaction increased the amount of lignin pyrolyzates and provided a potential tar reduction during gasification.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Jongik Park, Hyungwook Lee, Keonku Lee, Sieun Noh, Soyeong Jin, Jungho Jae, Youngdo Jeong, Jaegeun Noh
Summary: Using renewable photocatalysts is a promising method for addressing environmental water challenges without additional energy consumption. In this study, a superabsorbent photocatalyst consisting of HNTs, GO, and ZnO was developed, showing significantly improved degradability compared to other combinations. The photocatalysts demonstrated enhanced activity in the degradation of rhodamine b, maintaining their initial activity after multiple uses.
Article
Green & Sustainable Science & Technology
Hyeon Su Heo, Sumin Pyo, Bo Sung Kang, Jung Sul Jung, Gwang Hoon Rhee, Young-Min Kim, Ji Man Kim, Young-Kwon Park
Summary: In this study, the feasibility of low-cost catalysts (gamma-Al2O3, spent FCC catalyst, and natural zeolite) in the pyrolysis of wood-plastic composite (WPC) was evaluated using thermogravimetric and pyrolyzer-gas chromatography/mass spectrometry analyses. The use of low-cost catalysts during catalytic fast pyrolysis (CFP) was found to decrease the decomposition temperature of polyethylene and polypropylene in WPC. Natural zeolite exhibited the lowest activation energy (Ea) of CFP, followed by spent FCC catalyst and gamma-Al2O3, respectively. Although CFP over natural zeolite was less effective in decreasing the production of low-quality hydrocarbons, paraffins, and olefins compared to spent FCC catalyst and gamma-Al2O3, it produced the largest amount of value-added aromatic hydrocarbons due to its high and strong acidity.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Chemistry, Multidisciplinary
Han Ung Kim, Jong Wha Kim, Sumin Seo, Jungho Jae
Summary: Efficient hydrolysis of cellulose is crucial for the cost-effective production of biofuels and biochemicals. This study investigated the feasibility of using ionic liquids (ILs) and deep eutectic solvents (DES) for the dissolution/regeneration (DR) of cellulose as an alternative to ball-milling pretreatment. The results showed that cellulose pretreatment using ILs and DES had superior kinetics for hydrolysis compared to conventional ball milling, suggesting the potential for replacing the high energy-demanding ball-milling process with the energy-saving DR process.
Article
Chemistry, Multidisciplinary
Vishnu Murali, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: This study presents an efficient green approach for the quantitative conversion of PET to high-density C6-C8 cyclic hydrocarbons using a Ru/TiO2 catalyst in a water-assisted biphasic system. The catalyst demonstrated a high selectivity in producing fuel-range C6-C8 cyclic hydrocarbons from PET. The addition of water to the biphasic system enhanced the rate of proton transfer on the catalyst support.
Article
Chemistry, Analytical
Guanshuai Zhang, Shanjian Liu, Dongmei Bi, Zhisen He, Jia Liu, Yinjiao Liu
Summary: Hydrogen peroxide pretreatment was applied for fast pyrolysis of corn stalks, and it was found that the pretreatment effectively promoted lignin depolymerization and decreased the reaction activation energy. The pretreatment also increased the cellulose content and removed alkali and alkaline earth metals from the biomass. The pH of the hydrogen peroxide solution affected the removal of lignin and ash by the pretreatment, and the composition of bio-oil changed significantly, with a significant increase in the relative content of levoglucosan after pretreatment.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2024)
