Article
Environmental Sciences
M. A. A. Mohamad Dzol, V. Balasundram, K. Shameli, N. Ibrahim, Z. A. Manan, R. Isha
Summary: The aim of this study is to investigate the effect of nickel-waste chicken eggshell modified Hydrogen exchanged Zeolite Socony Mobil-5 (Ni-WCE/HZSM-5) on the pyrolysis of high-density polyethylene (HDPE). The impregnation of nickel and WCE significantly affected the structure and surface properties of HZSM-5. Among the tested catalytic samples, WCE showed the highest pyrolysis oil yield and Ni/HZSM-5 exhibited the highest yield of C6 and C7 hydrocarbons.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Jihyeon Seo, Hyunjin Kim, Sugyeong Jeon, Soheil Valizadeh, Yasin Khani, Byong-Hun Jeon, Gwang Hoon Rhee, Wei-Hsin Chen, Shiung Lam, Moonis Ali Khan, Young-Kwon Park
Summary: Air gasification of Wood-Plastic Composite (WPC) using Ni-loaded HZSM-5 catalysts resulted in H2-rich gas. The catalytic activity was adversely affected by increasing the SiO2/Al2O3 ratio (SAR) of HZSM-5. The highest gas yield and H2 selectivity were obtained using 20%Ni/HZSM-5(30). Reducing SAR led to an increase in acyclic compounds in oil products.
BIORESOURCE TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Tao Wang, Qian Liu, Wenqi Zhong, Xuecheng Tang
Summary: Metal loaded HZSM-5 catalysts were used in the catalytic co-pyrolysis of lignite and HDPE/waste plastic to enhance the yields of light aromatics such as benzene, toluene, ethylbenzene, xylene, naphthalene and methylnaphthalene (BTEXNM). The highest content of light aromatics was achieved at a pyrolysis temperature of 600 degrees C and a lignite to plastic mix ratio of 3:1. Among the metal loadings, 3 wt%Ga was found to be the most effective in increasing the content of aromatic products, and the combination of 1 wt%Mo and 2 wt%Ga showed the highest increase in monocyclic aromatic hydrocarbons.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Multidisciplinary
Yaoyuan Zhang, Qin Wu, Kun Zhang, Daxin Shi, Shujun Jia, Kangcheng Chen, Hansheng Li
Summary: HZSM-5/MCM41 composites with different Si/Al2 ratios were prepared by the hydrothermal method and their catalytic performance in n-decane catalytic cracking was investigated. HZSM-5/MCM-41 exhibited higher selectivity to light olefins and lower deactivation rate compared to HZSM-5 due to improved diffusion rate and decreased acid density. Extrusion of HZSM-5/MCM-41 with γ-Al2O3 further enhanced the selectivity to light olefins through the synergy effect of fast diffusion rate and passivation of external acid density.
Article
Energy & Fuels
Nai-Yu Yao, Jing-Pei Cao, Jing-Ping Zhao, Zi-Meng He, Xiao-Bo Feng, Tian-Long Liu, Ze-Ying Wang, Xiao-Yan Zhao
Summary: The addition of Zn during synthesis of HZSM-5 catalysts led to higher yields and selectivity in the catalytic reforming of cellulose pyrolysis volatiles, as well as improved mass transfer and anti-coking performance.
Article
Engineering, Environmental
Qiang Sun, Hongxia Gao, Teerawat Sema, Zhiwu Liang
Summary: This study compared the CO2 desorption performance of different Si/Al ratios of HZSM-5 zeolites and successfully synthesized hierarchical HZSM-5 with higher catalytic activity. The results showed that desilication by modification in sodium hydroxide could significantly improve the mesoporous surface area and enhance CO2 desorption capacity. These findings are important for improving catalyst design in CO2 capture technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jianyu Sun, Yuhang Tian, Jifeng Cao, Qilun Huang, Zilin Fang, Zhenzhou Ma, Xu Hou, Enxian Yuan, Tingting Cui
Summary: This study explores the effects of ethanol on n-heptane catalytic cracking over HZSM-5 zeolites. Ethanol addition promotes alkene selectivity but accelerates HZSM-5 deactivation.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yazhuo Wang, Leilei Cheng, Jing Gu, Yuyuan Zhang, Jiahuan Wu, Haoran Yuan, Yong Chen
Summary: This study successfully improved the selectivity and yield of monocyclic aromatics from waste plastics by regulating the acidic properties of the catalyst and processing parameters, and reducing the production of carbon deposits. This conversion technology provides a feasible approach for plastic recycling.
Article
Engineering, Chemical
Wenhui Li, Jiaxing Zhang, Xiao Jiang, Minchen Mu, Anfeng Zhang, Chunshan Song, Xinwen Guo
Summary: This study focuses on the hydrogenation of carbon dioxide (CO2) to gasoline using a tandem catalyst. The researchers synthesized HZSM-5 nanosheets with different thicknesses and composited them with In2O3/ZrO2 to create the tandem catalysts. The results showed that an appropriate length of straight channels in the catalyst can improve the selectivity and prevent deactivation. The addition of cobalt (Co) further enhanced CO2 conversion and selectivity. This study provides insights into designing effective catalysts for CO2-to-gasoline conversion.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
L. N. Vosmerikova, Z. M. Matieva, Yu M. Snatenkova, N. Kolesnichenko, V. Zaikovskii, A. V. Vosmerikov
Summary: Zinc-isomorphously substituted HZSM-5 catalyst (Zn/HZSM-5(iso)) exhibits high selectivity and efficiency in the conversion of a mixture of DME + syngas.
Article
Energy & Fuels
Haifeng Tian, Jiapeng Jiao, Haizhou Tian, Huanhuan He, Fei Zha, Xiaojun Guo, Xiaohua Tang, Yue Chang
Summary: Methanol to aromatics (MTA) is an effective method to produce aromatics through a non-petroleum route, with the acidity and structure of zeolite catalysts being key factors. Different preparation methods and Zn sources significantly influenced the products distribution in the MTA reaction. Steam-assisted crystallization method was found to improve the crystallinity and pore structure of the ZnZ8 catalyst.
Article
Environmental Sciences
Yunfei Wu, Kechao Wang, Baoyong Wei, He Yang, Lijun Jin, Haoquan Hu
Summary: A higher heating rate can significantly increase the liquid oil yield, while the oil is heavy; The addition of HZSM-5 is beneficial for obtaining high-quality liquid oils; A lower catalytic temperature is favorable for the generation of light oil components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Applied
Hengbo Huang, Ting Fang, Hui Liu, Hao Zhou, Dongfang Chen, Wenzhi Jia, Min Liu, Junhui Li, Zhirong Zhu
Summary: This study reveals the different reaction pathways of ethanol-to-hydrocarbons on the external surface and channels of HZSM-5 by comparing the catalytic performance of ZSM-5 samples with different acidic types and locations. The B acid sites on the external surface are responsible for the efficient conversion of ethanol/ethylene into C3+ hydrocarbons.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ning Wang, Xinglong Dong, Lingmei Liu, Dali Cai, Qingpeng Cheng, Jianjian Wang, Yilin Hou, Abdul-Hamid Emwas, Jorge Gascon, Yu Han
Summary: The crystal size of HZSM-5 determines the form and location of MoCx species; MoCx sites are preferentially deactivated on nano-sized HZSM-5; Properly protecting MoCx particles can enhance their activity.
CELL REPORTS PHYSICAL SCIENCE
(2021)
Article
Energy & Fuels
Qin Zeng, Zhenyu Du, Ligang Luo
Summary: This study investigated the improvement of kraft lignin depolymerization process using different bimetallic catalysts and supports, determining the effects of catalysts on the selectivity of aliphatic alcohol and hydrocarbon monomers. The optimal conditions for temperature and reaction time were discussed, as well as the analysis of chemical bonds with the catalyst to understand the depolymerization process.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Chemistry, Applied
Everton Santos, Bruna Rijo, Francisco Lemos, M. A. N. D. A. Lemos
Summary: The catalytic reactive distillation reactor was improved to increase production of middle and heavy hydrocarbons from high density polyethylene (HDPE) for Circular Economy of plastics. Both thermal and catalytic pyrolysis experiments showed different product distributions, with thermal pyrolysis producing more solid products while catalytic pyrolysis produced mainly liquid products in the form of C5 to C11 fractions. The aim was to develop a reactor/separation system for increased middle olefin production for reuse in the petrochemistry industry.
Article
Environmental Sciences
Regiane C. Ferreira, Diogo Dias, Isabel Fonseca, Maria Bernardo, Joao Lourenco Castagnari Willimann Pimenta, Nuno Lapa, Maria A. S. D. de Barros
Summary: Bovine bone char (BC) was used for highly efficient simultaneous removal of paracetamol and Cu(2+) ions from aqueous solutions. The presence of paracetamol enhanced the affinity of Cu(2+) in the binary system, leading to a higher removal rate of Cu2+.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Chemistry, Applied
Sara Inocencio, Teresa Cordeiro, Ines Matos, Florence Danede, Joao C. Sotomayor, Isabel M. Fonseca, Natalia T. Correia, Marta C. Corvo, Madalena Dionisio
Summary: Loading poorly water-soluble ibuprofen drug into inorganic silica matrix can achieve full drug amorphization and enhance drug release rate. Different surface modifications of the matrix can affect the speed and pathway of drug release, with water molecules playing a crucial role in the process.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Energy & Fuels
A. Umut Sen, Frederico G. Fonseca, Axel Funke, Helena Pereira, Francisco Lemos
Summary: The pyrolysis kinetics of Quercus cerris cork were studied using thermogravimetric analysis. The activation energies and chemical compositions of cork components were determined by different model-fitting methods. The results suggest that the pyrolysis of cork possibly follows nth-order kinetics, and the first-order model could be used for practical applications. Additionally, the thermal decomposition of cork hemicelluloses and cellulose is similar to that of wood, while cork suberin decomposes in two distinct steps.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Biochemistry & Molecular Biology
Rita Dias, Diogo Sousa, Maria Bernardo, Ines Matos, Isabel Fonseca, Vitor Vale Cardoso, Rui Neves Carneiro, Sofia Silva, Pedro Fontes, Michiel A. Daam, Rita Mauricio
Summary: The study evaluated the potential of using drinking water treatment sludges (WTS) containing high concentrations of activated carbon for the removal of two hormones. Results showed promising adsorption potential of both WTS for the hormones, suggesting a new method for removing EPs from wastewater.
Review
Energy & Fuels
Maria Bernardo, Nuno Lapa, Isabel Fonseca, Isabel A. A. C. Esteves
Summary: Porous carbon materials derived from biomass waste and by-products are versatile, economical, and have high adsorption capacity, making them suitable for environmental applications such as CO2 capture and upgrading biogas. Upgrading biogas to bio-CH4 through an adsorption process can produce high-quality biomethane and replace fossil natural gas, contributing to a circular economy and renewable energy market.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Chemistry, Applied
J. E. Castanheiro, J. Vital, I. M. Fonseca, A. M. Ramos
Summary: The acetalization of glycerol with hexanal was studied using sulfonic acid-functionalized mesoporous silica, showing optimal activity when the amount of sulfonic acid groups was moderate. Activity increased with the number of sulfonic acid groups until reaching a maximum, after which a decrease was observed. The catalytic stability of the [SO3H](3)-SBA-15 catalyst was evaluated through consecutive batch runs, demonstrating good stability.
Article
Chemistry, Applied
Marcia G. Ventura, Thomas Pullert, Rubia Risso, Ines Matos, I. Fonseca, Joaquim M. Vital
Summary: Composite materials based on CaO from egg shells and anionic sulfated linear polysaccharide k-carrageenan from red seaweeds were successfully used as a heterogeneous catalyst for transesterification reaction of soybean oil with methanol. The prepared composites exhibited excellent thermal stability and catalytic activity, with an internal structure consisting of meso and macropores that widen with the addition of a crosslinker HMDI.
Article
Environmental Sciences
D. Dias, M. Bernardo, F. Pinto, I. Fonseca, N. Lapa
Summary: The study found that the GC obtained from the co-gasification of rice husk and polyethylene showed better performance in continuous flow Cr(III) removal assays compared to the commercial activated carbon (CAC), although in batch conditions, the results were the opposite. Both adsorbents removed Cr(III) through precipitation, with CAC showing slightly higher removal due to its higher porosity. Regeneration studies revealed that neither GC nor CAC could be used in more than one cycle.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
D. T. Pio, H. G. M. F. Gomes, L. A. C. Tarelho, A. C. M. Vilas-Boas, M. A. A. Matos, F. M. S. Lemos
Summary: The study evaluated the impact of steam injection during biomass gasification on producer gas composition and efficiency. For low-density biomass, steam injection increased H2 concentration and H2/CO ratio but lowered energy content and efficiency, potentially due to the water-gas shift reaction. For high-density biomass, steam injection improved producer gas energy content and efficiency by promoting char accumulation and char-steam reforming reactions.
Article
Chemistry, Multidisciplinary
Fernando C. G. Martinho, Luis G. Picado-Santos, Francisco M. S. Lemos, Maria Amelia N. D. A. Lemos, Everton R. F. Santos
Summary: This work aimed to modify binder in the paving industry using sustainable wax, resulting in improved consistency and rheological behavior. The addition of the wax and other additives led to changes in viscosity and handling temperatures of the binders, contributing to the goals of the U.N. 2030 Agenda.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Inorganic & Nuclear
Tiago F. C. Cruz, Patricia S. Lopes, M. Amelia N. D. A. Lemos, Luis F. Veiros, Pedro T. Gomes
Summary: This study synthesized five dinuclear copper(I) complexes and analyzed their structure and electronic properties through NMR spectroscopy, elemental analysis, X-ray diffraction, DFT calculations, and cyclic voltammetry. It was found that these copper(I) complexes can serve as catalysts for azide-alkyne cycloaddition reactions, producing products with high yields and turnover frequencies.
DALTON TRANSACTIONS
(2023)