Article
Engineering, Environmental
Tsuyoshi Nagasawa, Atsushi Kobayashi, Susumu Sato, Hidenori Kosaka, Kyeounghak Kim, Hyo Min You, Katsunori Hanamura, Ami Terada, Takao Mishima
Summary: This study presents a direct visualization of oxygen storage process in a Pd/CeO2-ZrO2 catalyst using a combined method of oxygen isotope labeling and reaction quenching. The presence of Pd enhances the diffusion depth of oxygen into the CZ bulk and the surface oxygen concentration. The results provide insights into the oxygen dynamics and transport in the metal/oxygen storage material system.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Natalia Diaz Montenegro, William S. Epling
Summary: The methane oxidation and oxygen storage capacity of a bilayer Pt/Pd/Al2O3 over a Mn0.5Fe2.5O4 spinel catalyst under periodic conditions were studied before and after SO2 exposure. Improvement in CH4 oxidation conversion was observed under periodic conditions compared to steady-state conditions before sulfur exposure. After sulfur exposure, a loss in CH4 oxidation performance and oxygen storage capacity of the spinel material was observed, but regeneration methods under periodic conditions led to improved CH4 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Kyoko Fujita, Hiroyuki Asakura, Saburo Hosokawa, Kentaro Teramura, Masaki Kobayashi, Koji Fujita, Tsunehiro Tanaka
Summary: The study revealed that Fe-doped gamma-Al2O3 can store and release oxygen reversibly during catalytic reactions, offering a new approach for developing oxygen storage materials without the need for rare metals.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Wei Tan, Shaohua Xie, Xin Wang, Chunying Wang, Yaobin Li, Thomas E. Shaw, Lu Ma, Steven N. Ehrlich, Annai Liu, Jiawei Ji, Fei Gao, Lin Dong, Fudong Liu
Summary: The study focuses on the improvement of Pt-CeO2 catalysts by designing new ceria-based supports. Through a unique T-IWI method, a Pt single site catalyst with excellent thermal stability was synthesized on a CZA-T support. The catalyst showed higher oxidation activity and Oxygen storage capacity (OSC) compared to traditional Pt catalysts on regular CeO2/Al2O3 and one-step prepared CeZrOx/Al2O3 supports. The higher Pt dispersion and stronger Pt-O-Ce interaction on the CZA-T support played a vital role in the CO oxidation performance and OSC of the catalyst.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Ying Xin, Hanxue Zhang, Pan Li, Ningning Qu, Ahui Tang, Fuzhen Yang, Dongxu Han, Junxiu Jia, Jin Wang, Lirong Zheng, Zhaoliang Zhang
Summary: The next-generation Euro 7 standard proposes lower pollutant limits for gasoline vehicles, which could be challenging for commercially used three-way catalysts. This article reports a low-content Rh-based three-way catalyst and a Pd-based three-way catalyst for gasoline particulate filters, which show potential for meeting strict emission standards.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Applied
Hiroshi Yoshida, Tomoyo Koide, Takuya Uemura, Yusuke Kuzuhara, Junya Ohyama, Masato Machida
Summary: In this study, the surface modification of a nanometric Rh overlayer by a small amount of Ce was found to enhance its three-way catalytic activity. The oxygen storage/release behavior of the surface Ce contributed to buffering the air-to-fuel change and improving the catalytic activity. The Ce-modified Rh overlayer with a metal honeycomb structure exhibited high activity even under A/F perturbation conditions at high space velocity, making it a promising and energy-saving alternative to conventional catalytic converters.
Article
Chemistry, Applied
Kai Chen, Jie Wan, Ting Wang, Qi Sun, Renxian Zhou
Summary: A series of Pt-Pd bimetallic catalysts supported on CeO2-ZrO2-La2O3 mixed oxides were synthesized and their catalytic performance and physio-chemical characterizations were evaluated. The Pt/Pd ratios strongly affect the three-way catalytic behaviors by modulating the synergistic effect and dispersion of precious metals. The improved dispersion promotes metal-support interaction, increases surface oxygen vacancies concentration, enhances the thermal stability, and augments low temperature CO and NO reactions through increased NOx adsorption and nitrate conversion.
JOURNAL OF RARE EARTHS
(2023)
Article
Nanoscience & Nanotechnology
Maria Pilar Yeste, Juan Carlos Hernandez-Garrido, Michael Uwe Kumke, Sarah Alvarado, Miguel Angel Cauqui, Jose Juan Calvino, Philipp-Alexander Primus
Summary: The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development. In this study, zirconia-supported ceria catalysts were synthesized and characterized. Experimental results show that the formation of reversible reactive pyrochlore structures can be achieved through low-temperature reduction-oxidation pretreatment, without altering the morphology of the catalyst.
ACS APPLIED NANO MATERIALS
(2022)
Article
Energy & Fuels
Martin Nilsson
Summary: This paper introduces a concept of pumped thermal energy storage based on the Stirling cycle, which provides a smaller sized energy storage and power conversion unit compared to conventional systems. By utilizing a single Stirling machine and combined with a single-tank liquid thermal storage on the hot side and a fan and radiator combination on the cold side, high round-trip efficiencies are achieved.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Applied
Zhiyu Zhou, Michael P. Harold, Dan Luss
Summary: Simultaneous conversion of NO, CO and C3H6 was carried out on washcoated monoliths containing oxygen storage material-promoted mixed Platinum group metals to evaluate the promotion effects and identify the best architecture. PGM supported directly on the OSM was found to be the best design for one type of OSM, while a dual-layer architecture outperformed the MFO-supported PGM catalyst. Enhancement in conversion efficiency was achieved with the dual-layer PGM-MFO catalyst due to a direct catalytic contribution from the spinel. The study provides insights into the benefits of OSM and guidance for optimizing multi-component PGM + OSM catalyst composition and architecture.
Article
Chemistry, Applied
Ayumi Fujiwara, Hiroshi Yoshida, Junya Ohyama, Masato Machida
Summary: This study investigated the redox behavior of Pd/CeO2-ZrO2 (Pd/CZ) model three-way catalysts through in situ diffuse reflectance spectroscopy, revealing a strong correlation between Pd oxidation rate and the presence of three-phase boundaries (TPB). The study found that TPB abundance plays a significant role in retarding Pd oxidation, with smaller particle sizes leading to more pronounced effects. The ratio of rate constants provides a useful index for estimating the deactivation of the catalyst due to thermal sintering.
Article
Engineering, Environmental
Hyoseong Woo, Eun Jun Lee, Haney Park, Dalyoung Yoon, Chang Hwan Kim, Kwan- Young Lee
Summary: In this study, the effects of introducing Pt and the synthesis method of Pd-Pt-Rh/Al2O3 catalysts were investigated for enhancing the thermal stability and three-way catalyst activity. Three synthesis methods were introduced: co-impregnation, sequential impregnation, and physical mixing. The physically mixed catalyst exhibited higher thermal stability than other catalysts due to the inhibited sintering after thermal aging.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Weiwei Yang, Mi-Young Kim, Felipe Polo-Garzon, Jian Gong, Xiao Jiang, Zhennan Huang, Miaofang Chi, Xinbin Yu, Xiang Wang, Yanbing Guo, Zili Wu
Summary: This study investigates the effects of thermal aging and sulfur poisoning on the efficiency and lifetime of natural gas three-way catalysts (TWCs). The results show that both thermal aging and sulfur-induced deactivations lead to a degradation in CH4 combustion performance due to the reconstruction of Pd species and decreased reducibility of the support. Sulfation aging promotes the activation of CH4 and O2, but the sulfate also hinders the exchange of lattice oxygen.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Taro Kamada, Taisei Ueda, Shuta Fukuura, Takashi Yumura, Saburo Hosokawa, Tsunehiro Tanaka, Daisuke Kan, Yuichi Shimakawa
Summary: In this study, catalytic model systems based on Pd-loaded SrFeOx films were fabricated to investigate the phenomenon of hydrogen spillover. The results showed that hydrogen spillover on the SrFeOx support can extend over long distances, up to 600 μm. The reduction of Fe4+ on the support surface induced by hydrogen spillover yields large energies, driving the unexpectedly long-distance hydrogen diffusion. These findings provide a deeper understanding of hydrogen spillover and offer insights for designing catalyst systems with enhanced properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Environmental
Yuanqing Ding, Yanyan Jia, Mingxiang Jiang, Yanglong Guo, Yun Guo, Li Wang, Qingping Ke, Minh Ngoc Ha, Sheng Dai, Wangcheng Zhan
Summary: The structure of CeO2-ZrO2 mixed oxides support significantly affects the catalytic activity of Pd/CZ catalysts in methane combustion, with CZ oxides featuring a two-phase composite structure exhibiting higher oxygen storage capacity and mobility, positively impacting the performance of Pd/CZ catalysts.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Jian Gong, Christopher J. Rutland
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2015)
Article
Engineering, Mechanical
Jian Gong, Christopher J. Rutland
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2015)
Article
Engineering, Chemical
Jian Gong, Kushal Narayanaswamy, Christopher J. Rutland
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2016)
Article
Engineering, Environmental
Jian Gong, Sandeep Viswanathan, David A. Rothamer, David E. Foster, Christopher J. Rutland
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2017)
Article
Engineering, Environmental
Jian Gong, Mark L. Stewart, Alla Zelenyuk, Andrea Strzelec, Sandeep Viswanathan, David A. Rothamer, David E. Foster, Christopher J. Rutland
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Engineering, Chemical
Yujun Wang, Yulin Pan, Changsheng Su, Arland Srinivasan, Jian Gong, Carl J. Kamp
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2018)
Article
Chemistry, Physical
Di Wang, Jian Gong, Jinyong Luo, Junhui Li, Krishna Kamasamudram, Neal Currier, Aleksey Yezerets
APPLIED CATALYSIS A-GENERAL
(2019)
Article
Chemistry, Applied
Jian Gong, Josh Pihl, Di Wang, Mi-Young Kim, William P. Partridge, Junhui Li, Michael Cunningham, Krishna Kamasamudram, Neal Currier, Aleksey Yezerets
Summary: The study evaluated the effects of oscillations in gas composition on the performance of a commercial Pd-based three-way catalyst for stoichiometric natural gas engines. The relationship between CH4 conversion and lambda change was explored, with the findings indicating that dynamic CH4 conversion is related to catalyst oxidation state. O-2 dosage was proposed as an effective descriptor of TWC dithering performance, and maps of dithering amplitude and O-2 dosage provide insights into optimal operation strategies for high CH4 and NO conversions.
Review
Energy & Fuels
Yujun Wang, Carl J. Kamp, Yuesen Wang, Todd J. Toops, Changsheng Su, Ruoqian Wang, Jian Gong, Victor W. Wong
Article
Engineering, Environmental
Yujun Wang, Jian Gong, Changsheng Su, Qisheng Ou, Qiang Lyu, David Pui, Michael J. Cunningham
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Review
Chemistry, Physical
Weiwei Yang, Jian Gong, Xiang Wang, Zhenghong Bao, Yanbing Guo, Zili Wu
Summary: This review focuses on the effects of sulfur on the catalytic oxidation of NO, HCs, and CO over DOCs, as well as the challenges in understanding the sulfur influence mechanism and designing next-generation sulfur-resistant DOCs.
Article
Engineering, Environmental
Weiwei Yang, Mi-Young Kim, Felipe Polo-Garzon, Jian Gong, Xiao Jiang, Zhennan Huang, Miaofang Chi, Xinbin Yu, Xiang Wang, Yanbing Guo, Zili Wu
Summary: This study investigates the effects of thermal aging and sulfur poisoning on the efficiency and lifetime of natural gas three-way catalysts (TWCs). The results show that both thermal aging and sulfur-induced deactivations lead to a degradation in CH4 combustion performance due to the reconstruction of Pd species and decreased reducibility of the support. Sulfation aging promotes the activation of CH4 and O2, but the sulfate also hinders the exchange of lattice oxygen.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jian Gong, Di Wang, Junhui Li, Neal Currier, Aleksey Yezerets
APPLIED CATALYSIS B-ENVIRONMENTAL
(2017)
Proceedings Paper
Engineering, Mechanical
Jian Gong, Christopher J. Rutland
PROCEEDINGS OF THE ASME INTERNAL COMBUSTION ENGINE DIVISION, FALL TECHNICAL CONFERENCE, 2014, VOL 1
(2014)
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.
