Review
Chemistry, Physical
Jose Marcos Moreira Ferreira, Eduardo Falabella Sousa-Aguiar, Donato Alexandre Gomes Aranda
Summary: Fluid catalytic cracking (FCC) is a crucial process in the petroleum-refining industry aimed at converting large hydrocarbon molecules into smaller, more valuable products. Catalyst accessibility greatly affects the efficiency of the FCC process, influencing the penetration of feedstock molecules and the desorption of reaction products. This review examines the characterization and enhancement of FCC catalyst accessibility, encompassing three decades of technical papers and patents. Bibliometric analysis of literature search results is presented, along with the described search strategy and evaluation process.
Article
Energy & Fuels
Iratxe Crespo, Roberto Palos, David Trueba, Javier Bilbao, Jose M. Arandes, Alazne Gutierrez
Summary: Motivated by extending catalysts' life cycle and enhancing the utilization of secondary refinery streams, this study aimed to obtain high quality gasoline by hydrocracking pre-hydrotreated light cycle oil (HT-LCO) using noble metals catalysts supported on spent fluid catalytic cracking (FCC) catalyst. The results revealed that a temperature of 400 degrees C was the optimum for hydrocracking HT-LCO, leading to maximized gasoline yield (up to 80 wt%) and minimized gas formation. The Pt/FCC catalyst outperformed the Pd/FCC catalyst, producing an iso-paraffinic gasoline fraction with a RON of 93.0, thanks to its high hydrogenation capacity.
Article
Engineering, Environmental
Martin Rodriguez-Fragoso, Shantal Zavala-Salazar, Miriam Moreno-Montiel, Christian Bouchot, Octavio Elizalde-Solis, Edgar Ramirez-Jimenez
Summary: An 8-lumps kinetic model based on feedstock composition is proposed. The model is fitted using a sensitivity analysis to identify reaction pathways contributing significantly to the desired products, resulting in improved fitting. It considers commonly used lumps in the industry, making it useful. An uncertainty analysis is performed to provide a probability bandwidth for experimental data and acknowledge possible errors. The model can predict behavior of different feedstocks using a single set of kinetic parameters differentiated by a deactivation factor.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yu-Kun Ma, Li -Li Xu, Long-Ren Ouyang, Lu-Lu Huang, Ai -Ping Jia, Yu Wang, Ji-Qing Lu
Summary: The Pt/ZSM-5-18 catalyst with a Si/Al molar ratio of 18 in the support is highly active for the oxidation of CH2Cl2, showing high selectivity towards CO2 formation. The excellent performance is attributed to abundant surface acidity and strong oxidation ability. The rate-limiting step is the C-Cl cleavage of CH2Cl2, while the oxidation of CH3Cl and CO is more facile. The catalyst's stability is hardly affected by Pt aggregation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Mariana N. Catrinck, Sebastiano Campisi, Paolo Carniti, Reinaldo F. Teofilo, Filippo Bossola, Antonella Gervasini
Summary: In this study, physical mixtures of Nb2O5•nH(2)O and NbOPO4 were prepared to investigate the role of phosphate groups in total acidity and two reactions involving carbohydrate biomass. The acid and catalytic properties were influenced by phosphate group enrichment. The presence of Bronsted sites on the surface favored inulin conversion and NbOPO4 exhibited the best hydrolysis activity with glucose/fructose formation. Additionally, a catalyst with a more phosphated surface showed reduced deactivation during the dehydration of fructose/glucose into HMF.
Article
Chemistry, Applied
Nikolaos Nikolopoulos, Luke A. Parker, Maurits W. Vuijk, Bert M. Weckhuysen
Summary: One of the main challenges for the chemical industries is finding new ways to produce lower olefins, such as propylene and ethylene, to satisfy the increase in demand for polymers. The addition of magnesium to zeolites in the MTH process has been studied to enhance the selectivity towards light olefins. Adjusting the location of magnesium in zeolite-based catalyst bodies has shown to have a significant impact on their physicochemical properties and catalytic performance in the MTH reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Yong Yang, Chaowei Liu, Xueli Ma, Zixuan Zu, Yi Su, Hongwei Li, Dong Ji
Summary: This study investigates the effects of metal contamination, specifically nickel, vanadium, and iron, on fluid catalytic cracking (FCC) catalysts. The results show that each metal has different destructive effects on the catalyst, with vanadium having the highest deactivation effect, while iron reduces the acidic sites. Multiple metal deposition leads to more serious performance issues.
Article
Engineering, Environmental
Gang Wang, Zengxi Li
Summary: In this study, the deposition and deactivation behavior of TFE and HFP oligomers on catalysts with different Lewis and BrOnsted acid site densities were investigated using (modified) Voorhies equation. The results showed that both BrOnsted and Lewis acid sites were responsible for the formation and deposition of TFE and HFP oligomers. The exponential relationship between the amount of oligomers deposited on catalyst and catalytic decay factor can be used to describe the catalyst deactivation process, which is important for catalyst modification and reaction condition optimization.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Fan Lin, Mengze Xu, Karthikeyan K. Ramasamy, Zhenglong Li, Jordan Lee Klinger, Joshua A. Schaidle, Huamin Wang
Summary: The article discusses the challenges faced by biomass conversion technologies, specifically in terms of catalyst deactivation and mitigation. It highlights the unique properties of biomass-derived feedstocks that cause catalyst deactivation and provides information on potential mitigation approaches to guide the design of robust catalysts and processes for biomass conversion.
Article
Chemistry, Physical
Jing Dong, Zhiwei Huang, Xiaomin Wu, Huawang Zhao, Huazhen Shen, Guohua Jing
Summary: Fe2O3/HY zeolite with a SiO2/Al2O3 ratio of 8 exhibits the maximum resistance to alkali poisoning, due to the presence of adequate framework protons and large pore entrances facilitating efficient cation diffusion and exchange processes for alkali trapping. The complex SiO2/Al2O3 ratio-dependent alkali-resistant behavior is observed for this catalyst, with higher SiO2/Al2O3 ratios showing limited H+ centers for binding alkali poisons, while lower ratios are limited by contracted pore entrances affecting ion-exchange processes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Preeti Sahu, Adarsh Sahu, Ayyamperumal Sakthivel
Summary: This study presents the preparation of gallium-containing MCM-22 zeolite material and its application in the synthesis of 2,3-dihydroquinazolin-4(1H)-ones. The material showed excellent isolated yield in the reaction, with strong acidic sites and a microporous nature.
Article
Energy & Fuels
Magdalena Zybert, Hubert Ronduda, Wojciech Patkowski, Weronika Rybinska, Andrzej Ostrowski, Kamil Sobczak, Wioletta Rarog-Pilecka
Summary: This paper investigates the extended stability of a highly active promoted cobalt catalyst for ammonia synthesis. The study shows that the catalyst can operate stably in an ammonia synthesis reactor at temperatures of 400-470 degrees Celsius without losing its beneficial catalytic properties over time. The decline in catalyst activity during long-term stability testing is less than 10%.
Article
Chemistry, Applied
Li Zhang, Qingxun Hu, Yucai Qin, Honghai Liu, Huangfei Liu, Gengzhen Cao, Xionghou Gao, Lijuan Song, Zhaolin Sun
Summary: Optimizing the accessibility of zeolite Y is crucial for improving the heavy oil cracking performance of fluid catalytic cracking (FCC) catalysts. Four FCC catalysts with different Y zeolite content were prepared by adjusting the crystallization time. The distribution characteristics of Y zeolite in the catalysts were analyzed using various microscopy techniques. The results showed that the distribution of Y zeolite in the outer layer of microspheres was beneficial for mass transfer performance and acid accessibility.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Engineering, Environmental
Santiago Orozco, Laura Santamaria, Maite Artetxe, Jon Alvarez, Javier Bilbao, Martin Olazar, Gartzen Lopez
Summary: The continuous catalytic fast pyrolysis of plastics was studied using a conical spouted bed reactor equipped with a fountain confiner and draft tube. An inexpensive equilibrium fluid catalytic cracking (FCC) catalyst was used. Operating under oxidative conditions improved product distribution and catalyst activity and stability. The role of the presence of air in the reaction environment on catalyst stability and deactivation mechanism was assessed.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Pablo D. Nieres, Victoria A. Vaillard, Juan Zelin, Nicolas I. Neuman, Andres F. Trasarti, Carlos R. Apesteguia, Santiago E. Vaillard
Summary: HG(2) is a reliable and extremely useful catalyst for synthesizing olefins, especially for the self-metathesis reaction of unsaturated fatty acid methyl esters. Silica gel is a promising support for large scale application of HG(2) due to its beneficial characteristics. However, storing the supported catalyst under atmospheric conditions at 298K significantly decreases its activity, which compromises its stability and applicability. Detailed experimental and spectroscopic studies, along with electronic structure calculations, shed light on the catalyst decomposition process.
Article
Environmental Sciences
Elias A. Christoforou, Paris A. Fokaides, Scott W. Banks, Daniel Nowakowski, Anthony V. Bridgwater, Stelios Stefanidis, Kostas G. Kalogiannis, Eleni F. Iliopoulou, Angelos A. Lappas
WASTE AND BIOMASS VALORIZATION
(2018)
Article
Chemistry, Physical
A. A. Marianou, C. M. Michailof, A. Pineda, E. F. Iliopoulou, K. S. Triantafyllidis, A. A. Lappas
APPLIED CATALYSIS A-GENERAL
(2018)
Article
Energy & Fuels
Eleni F. Iliopoulou, Kostas S. Triantafyllidis, Angelos A. Lappas
WILEY INTERDISCIPLINARY REVIEWS-ENERGY AND ENVIRONMENT
(2019)
Article
Chemistry, Physical
Sofia Darda, Eleni Pachatouridou, Angelos Lappas, Eleni Iliopoulou
Article
Chemistry, Physical
A. C. Psarras, C. M. Michailof, E. F. Iliopoulou, K. G. Kalogiannis, A. A. Lappas, E. Heracleous, K. S. Triantafyllidis
MOLECULAR CATALYSIS
(2019)
Article
Chemistry, Applied
E. Kantarelis, R. Javed, S. Stefanidis, A. Psarras, E. Iliopoulou, A. Lappas
TOPICS IN CATALYSIS
(2019)
Article
Engineering, Chemical
Andrey A. Gusev, Antonios C. Psarras, Konstantinos S. Triantafyllidis, Angelos A. Lappas, Paul A. Diddams, Iacovos A. Vasalos
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
Chemistry, Applied
Caterina Zerva, Stamatia A. Karakoulia, Konstantinos G. Kalogiannis, Antigoni Margellou, Eleni F. Iliopoulou, Angelos A. Lappas, Nikolaos Papayannakos, Konstantinos S. Triantafyllidis
Summary: The study investigated the hydrodeoxygenation of pure phenol and catalytic biomass fast pyrolysis oil over 10%Ni/ZrO2 and 10%Ni/WO3-ZrO2 catalysts. It was found that the addition of WO3 improved the catalytic activity, especially in the complete hydrodeoxygenation of phenol to cyclohexane. The 10%Ni/WO3-ZrO2 catalyst showed high activity and selectivity in both phenol and bio-oil hydrodeoxygenation reactions.
Article
Chemistry, Applied
Eleni Heracleous, Eleni F. Iliopoulou, Kleoniki Drakaki, Maria C. Papapetrou, Dimitris K. Iatridis, Angelos A. Lappas
Summary: Efficient processes for upgrading low value bio-derived liquid intermediates to high added value products are crucial for the establishment of a robust bio-based economy. This study demonstrates that low quality biofuels can be converted to high quality fuel and chemicals through hydroisomerization and catalytic cracking. Both processes have been validated on a pilot scale, showing good scalability and applicability in thermochemical biorefineries.
Correction
Chemistry, Multidisciplinary
Georgios Varvoutis, Maria Lykaki, Eleni Papista, Sonia A. C. Carabineiro, Antonios C. Psarras, Georgios E. Marnellos, Michalis Konsolakis
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Multidisciplinary
Georgios Varvoutis, Maria Lykaki, Eleni Papista, Sonia A. C. Carabineiro, Antonios C. Psarras, Georgios E. Marnellos, Michalis Konsolakis
Summary: The effect of cesium doping on CuO/CeO2 catalysts under CO2 hydrogenation conditions was investigated. Results showed that a low amount of cesium improved CO selectivity but inhibited CO2 conversion. Specifically, doping with 2 cesium atoms per nm(2) at 430 degrees Celsius led to over 96% CO selectivity and equilibrium CO2 conversion.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Energy & Fuels
Eleni F. Iliopoulou, Charitini Matsouka, Eleni Pachatouridou, Flora Papadopoulou, Antonios Psarras, Antigoni Evdou, Vassilios Zaspalis, Lori Nalbandian
Summary: Novel customized lanthanum calcium manganese perovskite structures with varying calcium content were studied for their oxygen transfer capacity, methane oxidation ability, selectivity to CO2 and CO, and stability in multiple reduction-oxidation cycles. The results showed that increasing calcium content enhanced the reducibility and oxygen adsorption capacity of the materials. Among the studied perovskites, CaMnO3 demonstrated the best redox properties.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Applied
E. F. Iliopoulou, S. Darda, E. P. Pachatouridou, A. A. Lappas
Summary: A series of Co-based catalysts were synthesized using different synthesis methods and parameters, and their catalytic performance in CH4 and CO oxidation reactions were investigated. The results showed that precipitated Co3O4 exhibited excellent performance in CH4 oxidation, while hydrothermally prepared Co3O4 exhibited good performance in CO oxidation.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Applied
Lulu Wan, Gan Ye, Yuying Chang, Zhaohan Yang, Guangming Shi, Qiuli Zhang, Jin Wang
Summary: This study developed an efficient approach to upgrade the oxidative desulfurization (ODS) performance of Zr-MOFs with proton stimulation. Experimental results showed that the introduction of protons can significantly improve the ODS efficiency. This work provides a facile and efficient strategy for enhancing the ODS performance of pristine MOFs.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Qiqi Lu, Xiu-Zhi Wei, Qi Zhang, Xinghua Zhang, Lungang Chen, Jianguo Liu, Yubao Chen, Longlong Ma
Summary: The application of Pd-M bimetallic clusters in the selective hydrogenation reaction was investigated, and the Pd0.6Ni@S-1 catalyst was found to exhibit high selectivity in the conversion of phenylacetylene to styrene. The confinement effect of zeolite inhibited over-hydrogenation and improved the stability of the catalysts. Furthermore, the solvent properties also influenced the product distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Review
Chemistry, Applied
Bo Li, Lumin Hong, Changdi Jing, Xianyang Yue, Huabo Huang, Qianqian Jiang, Jianguo Tang
Summary: MOF materials with adjustable pore structure and polymetallic sites have been explored as electrocatalysts for OER. Bimetallic materials show higher electrocatalytic activity than monometallic materials, while carbon-coated and doped MOF catalysts exhibit stable and good OER activity. The synergistic interaction between polymetallic active sites effectively improves the intrinsic activity of MOF on OER.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shichun Gu, Ruyi Wang, Junxiong Zhang, Hairong Dong, Liping Deng, Xue Wang, Yapeng He
Summary: In this study, monodispersed hollow mesoporous organosilica nanospheres with controlled core cavity and mesoporous shell were successfully synthesized. These hollow nanospheres showed a high adsorption capacity for Pb2+ in water solution and exhibited acceptable recycling and stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Lucie Havelkova, Bogdana Bashta, Michaela Vankova, Jiri Zednik, Jiri Brus, Jan Svoboda, Alice Vagenknechtova, Jan Sedlacek
Summary: An atom-economic one-step chain-growth coordination homopolymerization providing high yields of functionalized hyper-cross-linked polyacetylenes with a permanent micro/mesoporous texture and a BET area of up to 1062 m2/g is reported. The homopolymerization is highly compatible with the heteroatom groups of the monomers and allows the preparation of well-defined porous networks with a wide spectrum of univalent groups.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shirui Pang, Yuxin Liu, Zhe Zhang, Yuxin Li, Chunguang Li, Zhan Shi, Shouhua Feng
Summary: This study focuses on using a functional separator to suppress the shuttle effect of soluble lithium polysulfides in Li-S batteries. It is found that the functionalized sulfonic acid group not only accelerates the conduction of lithium ions, but also repels polysulfide anions through electrostatic interactions. The performance of the batteries is significantly improved with the use of this functionalized separator.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Pingping Li, Lei Han, Donghun Kim, Kemal Celebi
Summary: This study presents a fast synthetic strategy for the preparation of high-quality platelike MFI crystals using a thin-wall tubular reactor. The strategy is efficient, time-saving, and can be optimized, making it applicable to the preparation and optimization of other important materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Haitao Yin, Wei Wang, Yuxin Li, Hu Wen, Shuang Chen, Nanzhe Jiang
Summary: This study presents a template-free and solid-state-like crystallisation method for the synthesis of ZSM-5 zeolite, which can be scaled-up in production. Mechanical mixing of starting material components improves the dispersion of materials, leading to ZSM-5 zeolite with high crystallinity and size uniformity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Congli Li, Jiang Wang, Zhenfei Wang, Jinxiang Dong, Qi Shi
Summary: This study investigates the evolution and autoreduction behavior of Cu species in CuCl/NaY adsorbent during vacuum thermal activation. It is found that Cu species migrate from supercages to the nearby plane of the six-membered ring connecting the supercage and sod cage during vacuum activation. At 150 degrees C, vacuum autoreduction occurs, resulting in the formation of Cu+Cl- species. The results provide reference for the preparation of pi-complex adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Irena Khatrin, Iman Abdullah, Alan J. Mccue, Yuni K. Krisnandi
Summary: Hierarchical porous system with two types of mesopores provides a solution to the diffusion limitation in conventional zeolites. Cobalt oxide impregnated hierarchical ZSM-5 zeolite samples with intra- and inter-crystalline mesopores were synthesized using two different strategies. The physicochemical properties of the modified catalysts were analyzed, revealing distinct features given by the two mesoporous configurations. Catalytic activity analysis showed that Co-oxide/ZSM-5 with inter-crystalline mesopores exhibited higher activity in methane partial oxidation reaction compared to Co-oxide/ZSM-5 with intra-crystalline mesopores.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Nataliia Reinders, Martin Durovic, Pavla Honcova, Zaneta Dohnalova, Jana Luxova, Stanislav Slang, Jhonatan Rodriguez-Pereira, Petra S. Sulcova
Summary: This study presents a new method for preparing a microporous Ni2P/C catalyst with high catalytic activity. The redox reaction and carbon matrix formation during high-temperature treatment contribute to the stability and activity of the catalyst. Experimental and analytical results suggest that the microporous structure of the composite plays a crucial role in its catalytic performance. These findings are important for practical applications of efficient hydrogen production by water electrolysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Ana Raquel Bertao, Viktoriya Ivasiv, Cristina Almeida-Aguiar, Patricia R. Correia, Antonio M. Fonseca, Manuel Banobre-Lopez, Fatima Baltazar, Isabel C. Neves
Summary: This study developed a zeolite-based delivery system (ZDS) using silver and 5-Fluorouracil as antimicrobial and antineoplastic agents. The ZDS was characterized and its antimicrobial properties were investigated, showing better antibacterial effectiveness for the ZDS containing both silver and 5-FU.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Naonobu Katada, Nobuki Ozawa, Etsushi Tsuji, Keigo Kanehara, Akiho Otsuka, Taiga Sakamoto, Kirari Umezawa, Hitoshi Matsubara, Satoshi Suganuma, Momoji Kubo
Summary: First principles calculations were used to investigate the pathway for methylation of benzene with methane catalyzed by MFI type zeolite-supported Co species. The strong adsorption of benzene on Co is found to lower the activation energy for methane dissociation and promote the formation of toluene precursor. The activation energy of methane dissociation is also affected by the Al-Al distance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Yuan Liu, An T. Ta, Kyoung Chul Park, Shenyang Hu, Natalia B. Shustova, Simon R. Phillpot
Summary: We use density functional theory to investigate the interactions of cerium, americium, and curium cations with crown ethers. Our results demonstrate that crown ethers can capture cerium, americium, and curium ions, and modifying the crown ether structure by substituting nitrogen atoms for oxygen atoms significantly increases their binding energies with radionuclides.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Zhengwu Peng, Shixing Wang, Yihui Wu, Xiang Liu, Hongliang Liu, Dekun Zhang, Likang Fu
Summary: An efficient adsorbent for recovery of germanium was prepared and characterized in this study. The adsorption behavior of Ge(IV) on the adsorbent was analyzed, and the results showed that it follows pseudo-secondary kinetic model and Langmuir isotherm model. The adsorbent exhibited good anionic anti-interference ability and can still maintain high adsorption efficiency after repeated adsorption.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
