Article
Chemistry, Applied
Jinho Oh, Yesuel Choi, Jaeuk Shin, Kyutae Kim, Jung Kyoo Lee
Summary: This study investigated the catalytic hydroconversion of C10+ heavy aromatics (C10+ Aro) to produce benzene, toluene, and xylenes (BTX), rich in xylenes. Two catalytic schemes, direct hydrocracking (HDC) and hydrotreating (HDT) followed by HDC, were explored. The results showed that the Mo2C/& gamma;-Al2O3 catalyst exhibited high selectivity for mono-aromatics and excellent catalytic stability in the HDT of C10+ Aro. The use of HZSM-5 in the HDC catalyst significantly enhanced the yield of BTX while limiting the formation of alkylbenzenes and heavy aromatic residues.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Energy & Fuels
Yan-Ting Zhang, Ni-Ni Zhang, Sheng-Li Chen, Hui Dang, Tao Wu
Summary: The catalysts based on selectively dealuminated Beta zeolites showed higher BTX selectivity and lower coke formation rate compared to those based on conventionally dealuminated Beta zeolites.
Article
Energy & Fuels
Xiao Zhou, Xian-Yong Wei, Yu-Miao Ma, Zhi-Min Zong
Summary: An active bifunctional nickel-based catalyst was prepared and successfully applied in the catalytic hydroconversion of alkali lignin. The soluble portions from catalytic hydroconversion showed a richer variety and higher yields of products compared to non-catalytic hydroconversion. The catalyst exhibited stability in the hydrocracking process of benzyloxybenzene.
Article
Energy & Fuels
Yijun Yu, Yingjie Guan, Peng Zhang, Xinhui Liu, Yitao Zhao, Jianguo Zhuang, Qichao Zhao, Yuchen Wang, Yuan Qian, Xuedong Zhu, Fan Yang
Summary: Light cycle oil (LCO) can no longer be used as fuel additives for diesel upgrading, so it is urgent to catalytically crack LCO into light aromatics for proper utilization. This work used ZSM-5 zeolites to investigate the active sites for LCO cracking and found that the reaction primarily occurs on the external acid sites. The nanosized ZSM-5 catalyst with abundant external acid sites exhibited the highest catalytic performance.
Article
Engineering, Chemical
Yuxiang Mao, Jun Cheng, Yang Shao, Hao Guo, Lei Qian, Weijuan Yang
Summary: An efficient bifunctional catalyst was synthesized by pyrolyzing Ni-based metal-organic frameworks (Ni-BDC) to enhance deoxygenation and cracking of fatty acid methylesters in jet fuel production. High-temperature pyrolysis destroyed coordinated Ni-O bonds in the Ni-BDC structure, generating active Ni nanoparticles anchored to carbon, thus enhancing Lewis acidity and deoxygenation ability. The Ni-BDC-600 catalyst exhibited higher selectivity for the conversion of methyl palmitate and microalgal biodiesel into jet fuel compared to the Ni-BDC catalyst.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Zhibing Shen, Fu Rao, Shangli Zhang, Shunmei Wang, Zhang Wu, Ruiyuan Tang, Shengrong Liang, Juntao Zhang, Shibao Yuan, Haiyan Jiang
Summary: By introducing methane, high yields of monocyclic aromatic hydrocarbons with methyl side chains, such as toluene and xylene, can be obtained. Methane participates in the reaction, supplies methyl side chains to the product, and improves product distribution. The promotional effect of methane on the hydrocracking of polycyclic aromatics was investigated using a carbonized NiMo/H beta catalyst in a methane and hydrogen environment.
CHINA PETROLEUM PROCESSING & PETROCHEMICAL TECHNOLOGY
(2023)
Article
Chemistry, Physical
David P. Jelenfi, Anita Schneiker, Attila Tajti, Gabor Magyarfalvi, Gyorgy Tarczay
Summary: In this study, the catalytic effect of small PAHs with an imperfect aromatic system on the formation of H-2 in the interstellar medium was investigated using quantum chemical computations. It was found that defects in the aromatic system compared to benzene can increase the rate of catalytic H-2 formation.
Article
Chemistry, Physical
Yu-Jen Shih, Zhi-Lun Wu
Summary: The crystal habit of metallic tin on a nickel foam electrode was manipulated using cationic surfactants to assess the selective conversion of NO3-. Different surfactants were found to modify the preference of tin crystal facets, affecting the selectivity towards N-2 and ultimately the efficiency of nitrate reduction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Ting Fang, Yangli Xie, Lirong Li, Yao He, Xu Yang, Linjie Zhang, Wenzhi Jia, Hengbo Huang, Junhui Li, Zhirong Zhu
Summary: A new Ni-HY zeolite catalyst with lamellar-crystals has been successfully prepared, showing significantly improved reactivity and BTX selectivity for phenanthrene hydrocracking. The catalyst's lamellar crystals enhance diffusion-reaction efficiency and promote phenanthrene conversion into benzene series, while also improving catalytic stability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Prabhleen Kaur, Md. Ehesan Ali
Summary: This study reveals the correlation between the radicaloid character of conjugated spacers and the strength of magnetic exchange interactions mediated through them.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Gabriel V. S. Seufitelli, Jason J. W. Park, Phuong N. Tran, Anthony Dichiara, Fernando L. P. Resende, Rick Gustafson
Summary: The study investigated the kinetics of ethylene oligomerization over Ni-H-Beta catalyst at temperatures between 50 and 100 degrees C and pressures between 5 and 28 atm. The reactions showed different apparent activation energies for butene, hexene, and octene formation, with evidence suggesting that octene formation mainly proceeds via the cascade co-oligomerization of re-adsorbed butene with ethylene.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Somayeh Taghavi, Paivi Maki-Arvela, Zuzana Vajglova, Markus Peurla, Ilari Angervo, Kari Eranen, Elena Ghedini, Federica Menegazzo, Mojgan Zendehdel, Michela Signoretto, Dmitry Yu Murzin
Summary: Citronellal was converted to menthol using a Ni catalyst supported on H-Beta zeolite. The acidity and Ni loading of the catalyst significantly influenced the catalytic performance. The best results were obtained with a Ni loading of 15 wt.% on H-Beta-25, giving a yield of 36% menthols and 77% stereoselectivity. The catalyst could be successfully regenerated and reused with similar activity and selectivity.
Article
Chemistry, Multidisciplinary
Guang Xiong, Huaxiang Yang, Liping Liu, Jiaxu Liu
Summary: A simple aerosol method was used to post-synthesize Sn-beta zeolite, a Lewis acid catalyst capable of activating C-O and C=O bonds in organic compounds. Sn-beta zeolites with different Sn contents were obtained by rapidly drying an aqueous solution containing SnCl2 and dealuminated beta zeolite using an aerosol generator. The physicochemical properties of the Sn-beta zeolites were characterized using XRD, nitrogen adsorption-desorption, FT-IR, and Py-FT-IR techniques. The catalysts showed good catalytic performances in the Baeyer-Villiger oxidation reaction of cyclohexanone.
Article
Green & Sustainable Science & Technology
Kalpana Manda, Manasa Kandula, Padmasri Hari Aytam, Pratyay Basak, Akella V. S. Sarma, Venugopal Akula
Summary: Rice husk-derived H beta zeolite supported Ni catalysts were used for CH4 cracking to produce clean hydrogen and carbon nanofibers, without CO or CO2 formation. The optimal Ni loading of 25 wt% exhibited the highest hydrogen yields and CNFs, with hydrogen production rates correlating well with the surface area of Ni. Deactivated catalysts showed semiconducting properties and potential as carbon electrode materials. Characterization using techniques such as BET surface area, p-X-ray diffraction, temperature programmed reduction, SEM, TEM, H-2-pulse chemisorption, Raman spectroscopy, and hydrogen rates provided insights into the physicochemical characteristics of the catalysts.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yuma Morimoto, Shinichi Hanada, Ryusuke Kamada, Arisa Fukatsu, Hideki Sugimoto, Shinobu Itoh
Summary: The hydroxylation of cyclohexane was successfully achieved using an iron(III) complex supported by a trianionic planar tetradentate ligand, showing high turnover number and selectivity for alcohol production. The involvement of an iron(III) acyl peroxido complex as the reactive species was suggested by spectroscopic measurements, providing insight into the reaction mechanism.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Donguk Kim, Seulah Lee, Jihye Lee, Yeseul Choi, Jaeuk Shin, Jung Kyoo Lee
RESEARCH ON CHEMICAL INTERMEDIATES
(2016)
Article
Electrochemistry
Nahyeon Kim, Changil Oh, Jaegyeong Kim, Jeom-Soo Kim, Euh Duck Jeong, Jong-Seong Bae, Tae Eun Hong, Jung Kyoo Lee
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2017)
Article
Chemistry, Multidisciplinary
Min-Gi Jeong, Hoang Long Du, Mobinul Islam, Jung Kyoo Lee, Yang-Kook Sun, Hun-Gi Jung
Article
Chemistry, Physical
Changil Oh, Naeun Yoon, Jaeho Choi, Yeseul Choi, Seonghyeon Ahn, Jung Kyoo Lee
JOURNAL OF MATERIALS CHEMISTRY A
(2017)
Article
Chemistry, Multidisciplinary
Nahyeon Kim, Hyejeong Park, Naeun Yoon, Jung Kyoo Lee
Article
Chemistry, Physical
Sun-Young Lee, Yunju Choi, Kyong-Soo Hong, Jung Kyoo Lee, Ju-Young Kim, Jong-Seong Bae, Euh Duck Jeong
APPLIED SURFACE SCIENCE
(2018)
Article
Electrochemistry
Yeseul Choi, Naeun Yoon, Nahyeon Kim, Changil Oh, Hyejeong Park, Jung Kyoo Lee
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2018)
Article
Chemistry, Physical
Youngseok Oh, Jaeuk Shin, Haeseong Noh, Chanwoo Kim, Yong-Su Kim, Yong-Kul Lee, Jung Kyoo Lee
APPLIED CATALYSIS A-GENERAL
(2019)
Article
Chemistry, Applied
Youngseok Oh, Haeseong Noh, Hyojeong Park, Hwayeon Han, Thanh-Binh Nguyen, Jung Kyoo Lee
Article
Electrochemistry
Hyejeong Park, Naeun Yoon, DongHwan Kang, Chohee Young, Jung Kyoo Lee
ELECTROCHIMICA ACTA
(2020)
Article
Electrochemistry
Naeun Yoon, Chohee Young, DongHwan Kang, Hyejeong Park, Jung Kyoo Lee
Summary: A rotational magnesiothermic reduction (R-MR) system was developed to efficiently produce high purity porous silicon (pSi) with high yield. The carbon-coated pSi/C samples and pSi/C@Gr composites exhibited stable cycling performance at high capacity and high cycling efficiency.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Hyojeong Park, Jinho Oh, Thanh-Binh Nguyen, Jung Kyoo Lee
Summary: The hydrogen storage and release characteristics of simulated light cycle oil (Sim-LCO) were studied and compared to a toluene/methylcyclohexane pair. Sim-LCO showed a higher H2 storage capacity and release of hydrogen compared to toluene. However, the dehydrogenation activity of the platinum catalyst needs improvement.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Electrochemistry
Chohee Young, Wondo Choi, Hyeonbin Kim, JeongWoo Bae, Jung Kyoo Lee
Summary: According to the kinetic studies, the magnesiothermic reduction reaction (MRR) of silica for producing porous silicon (pSi) microparticles shows better precursor conversion and pSi yield under dynamic conditions compared to static conditions. The pSi microparticles, which are mesoporous and composed of interconnected primary silicon nanoparticles, exhibit significantly enhanced cycling stability when used as anode materials in lithium-based batteries. Therefore, the dynamic MRR (D-MRR) is a highly efficient and scalable production process for pSi microparticles for advanced lithium-based batteries.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Jaeuk Shin, Youngseok Oh, Yeseul Choi, Jihye Lee, Jung Kyoo Lee
APPLIED CATALYSIS A-GENERAL
(2017)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
