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, Physical
Adrian Quindimil, M. Carmen Bacariza, Jose A. Gonzalez-Marcos, Carlos Henriques, Juan R. Gonzalez-Velasco
Summary: This study improved the performance of Ni/Al2O3 catalyst for low temperature CO2 methanation by using glycerol-assisted impregnation and co-impregnation of Ru. The Ru dispersion in RuAlGAI catalyst was higher, and NiAlGAI catalyst showed slightly higher metal surface and better catalytic performance. Additionally, co-impregnating Ru significantly increased Ni surface area and led to a higher methane yield.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Rajat Subhra Ghosh, Michael P. Harold, D. Wang
Summary: Modeling and optimization were presented for the Pt/Al2O3@Cu/ZSM-5 core-shell catalyst used as an Ammonia Slip Catalyst in a recent study. The study successfully demonstrated the synthesis and application of this core-shell catalyst, showing superior performance due to enhanced Pt activity and dense zeolite shell. A heterogeneous fixed-bed reactor was developed to predict and optimize the CS catalyst performance, incorporating independent kinetic models for NH3 oxidation and NOx reduction.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Ana Luiza Freitas Ferreira, Kimberly Paim Abeyta, Jordan Gonzaga Andrade Batista Silva, Ronaldo Costa Santos, Luiz Antonio Magalhaes Pontes
Summary: Glycerol, as a raw material, has applications in various industrial processes, yet its supply exceeds demand. This study investigates the conversion of glycerol into high added-value chemical products by dehydration and hydrogenation reactions, specifically targeting the production of 1,2-PDO and 1,3-PDO. By studying catalysts made of 2% Pt and 10% WO3 supported on SBA-15, the researchers explore the influence of different impregnation methods on the structural and textural properties of the catalysts. The results indicate that co-impregnation provides better dispersion of WO3 species and leads to a greater formation of Bronsted acid sites, while both methods yield catalysts with predominance of Lewis sites.
MATERIA-RIO DE JANEIRO
(2023)
Article
Chemistry, Applied
Franklin J. Mendez, Javier A. Alves, Yahse Rojas-Challa, Oscar Corona, Yanet Villasana, Julia Guerra, German Garcia-Colli, Osvaldo M. Martinez, Joaquin L. Brito
Summary: The study investigated the catalytic performance of two reduced Al2O3-supported Pd-based catalysts during 1-butyne hydrogenation, revealing high conversion rates and selectivity to 1-butene, as well as significant differences in hydroisomerizing and hydrogenating capabilities between the two catalysts. These findings may have industrial applications and offer guidance for the development of Pd-based catalysts with specific catalytic properties.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Davyd Urbanas, Edita Baltrenaite-Gediene
Summary: In this study, Mn-based catalysts supported by highly porous silica gel powder were prepared by six different methods in liquid solutions and tested for selective catalytic reduction of NOx with ammonia. Characterization techniques were used to provide comprehensive information about the composition, morphology, dispersion of active components, chemical forms, and structural properties of the catalysts. The results showed that while all preparation methods ensured uniform distribution of Mn species on the carrier surface, liquid phase techniques led to a reduction in surface area and pore volume. The most effective preparation methods were found to be incipient wetness impregnation and electroless metal deposition.
Article
Chemistry, Multidisciplinary
Qiucheng Xu, Aoni Xu, Sahil Garg, Asger B. Moss, Ib Chorkendorff, Thomas Bligaard, Brian Seger
Summary: In this study, a descriptor called surface-accessible CO2 concentration ([CO2](SA)) was developed to indicate the limits of CO2-to-CO conversion in CO2 electrolysis. Three general strategies were identified to enrich [CO2](SA), resulting in improved performance. The maximum j(CO) achieved was 368 +/- 28 mA cm(geo)(-2) using a commercial silver catalyst.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Editorial Material
Chemistry, Physical
Jakob Kibsgaard, Ib Chorkendorff
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tuomas O. Lilius, Kristian Nygaard Mortensen, Claire Deville, Terhi J. Lohela, Frederik Filip Staeger, Bjorn Sigurdsson, Elisabetta M. Fiordaliso, Marko Rosenholm, Chris Kamphuis, Freek J. Beekman, Andreas I. Jensen, Maiken Nedergaard
Summary: Nanoparticles hold promise for treating CNS disorders, but the BBB remains a barrier. Intra-cisterna magna administration of gold nanoparticles combined with hypertonic saline significantly increases their uptake in deep brain regions. Visualization by MRI shows that AuNPs enter the CNS through periarterial spaces and are cleared from the brain within 24 hours.
JOURNAL OF CONTROLLED RELEASE
(2023)
Article
Chemistry, Physical
Asger B. Moss, Joel Hatinen, Peter Kus, Sahil Garg, Marta Mirolo, Ib Chorkendorff, Brian Seger, Jakub Drnec
Summary: We present a design for an electrochemical cell that can be used for High Energy X-ray operando studies of Membrane Electrode Assembly (MEA) based electrochemical systems. The flowplate materials in the cell can be changed according to experimental needs, allowing for the study of different chemistries and reactions. The design also enables the coupling of X-ray elastic scattering techniques with computed tomography reconstruction, which enables 3D mapping of chemical and structural properties in operating devices. The cell was originally designed and tested for studying CO2 electrolysis performance using Wide Angle X-ray Scattering (WAXS) technique.
JOURNAL OF POWER SOURCES
(2023)
Article
Instruments & Instrumentation
Mads R. Almind, Jakob S. Engbaek, Mikkel F. Hansen, Soren B. Vendelbo, Peter M. Mortensen, Christian D. Damsgaard, Thomas Veile, Ib Chorkendorff, Cathrine Frandsen
Summary: We have developed an in situ sample holder similar to a quartz-based plug-flow reactor for gas-controlled vibrating sample magnetometry (VSM) at ambient pressure and temperatures up to approximately 1000 degrees C. The results show that the holder allows control of gas composition and sample reduction/oxidation, with similar measurement sensitivity and improved repeatability compared to conventional sample cups. The in situ holder uses a closed gas tubing system to prevent contact between the active gas and the VSM and oven parts, and the gas can be collected for analysis and safe handling at the outlet.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Instruments & Instrumentation
Clara C. Aletsee, Degenhart Hochfilzer, Anika Kwiatkowski, Markus Becherer, Jakob Kibsgaard, Ib Chorkendorff, Martin Tschurl, Ueli Heiz
Summary: Despite challenges in evaluating the catalytic performance of photoactive materials, a gas phase mu-photoreactor has been developed that is re-openable and re-usable, enabling post-characterization and catalyst screening studies. The reactor allows sensitive and time-resolved reaction monitoring at ambient pressure, and its microfabricated lid enhances sensitivity. The successful operation of the reactor is demonstrated through selective ethanol oxidation over Pt-loaded TiO2.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Peidi Xu, Niels-Henrik Holstein-Rathlou, Stinne Byrholdt Sogaard, Carsten Gundlach, Charlotte Mehlin Sorensen, Kenny Erleben, Olga Sosnovtseva, Sune Darkner
Summary: The renal vasculature plays a crucial role in kidney function both in normal physiology and in disease. However, current imaging techniques lack sufficient resolution to assess its structure and function. To develop realistic models and diagnostic methods, we propose a hybrid framework that combines automated segmentation and optimization algorithms to create subject-specific models of the renal vascular network. Our results demonstrate a close agreement with existing anatomical data, validating the accuracy of our approach.
SCIENTIFIC REPORTS
(2023)
Article
Agriculture, Dairy & Animal Science
Sina Baier-Stegmaier, Carsten Gundlach, Mariann Chriel, Mette Sif Hansen, Christina Vedel-Smith, Charlotte Vikkels Hansen, Daniel Klingberg Johansson, Louise Birgitte Henriksen, Magnus Wahlberg, Charlotte Bie Thostesen, Aage Kristian Olsen Alstrup, Kristian Murphy Gregersen, Cino Pertoldi, Sussie Pagh
Summary: X-ray micro-computed tomography (mu-CT) has been verified as a non-invasive method for age determination of three species within the order of Carnivora and suborders Odontoceti. The number of visible dental growth layers extracted from mu-CT data showed a high correlation with the true age for all three species.
Article
Chemistry, Physical
Asger B. Moss, Sahil Garg, Marta Mirolo, Carlos A. Giron Rodriguez, Roosa Ilvonen, Ib Chorkendorff, Jakub Drnec, Brian Seger
Summary: Membrane electrode assembly (MEA) CO2 electrolyzers are a promising approach for carbon-neutral chemical production, but stability issues due to flooding of the gas diffusion electrode (GDE) are common. This study investigates the causes of CO2 reduction reaction (CO2RR) selectivity suppression on Cu using in operando X-ray diffraction (XRD) analysis. The findings highlight the importance of proper ion management for enhanced durability in these devices.
Article
Chemistry, Multidisciplinary
Jon Bjarke Valbaek Mygind, Jakob B. Pedersen, Katja Li, Niklas H. Deissler, Mattia Saccoccio, Xianbiao Fu, Shaofeng Li, Rokas Sazinas, Suzanne Z. Andersen, Kasper Enemark-Rasmussen, Peter C. K. Vesborg, Jakob Doganli-Kibsgaard, Ib Chorkendorff
Summary: Ethanol plays a crucial role in the Li-NRR reaction, not only as a proton shuttle but also in facilitating a good solid-electrolyte interphase (SEI) and participating in electrolyte transformations. The ethanol-formed SEI enables ammonia synthesis even in an ethanol-free electrolyte.
Article
Optics
Anthony Seret, Jan Kehres, Carsten Gundlach, Ulrik Lund Olsen, Henning Friis Poulsen, Dorte Juul Jensen, Mark Cordier, Benjamin Stripe, Wenbing Yun, Yubin Zhang
Summary: This study presents and characterizes a novel focusing optics, composed of twin paraboloidal capillaries coated with Pt, for laboratory X-ray sources. The optics are designed to produce achromatic focused beam with high photon energies up to 40 keV. The performance of the optics is evaluated under different operational conditions, and the suitability and advantages of the optics for X-ray microdiffraction are demonstrated using polycrystalline aluminium. Possibilities for further developments are suggested.
Article
Chemistry, Physical
Eric J. Mcshane, Valerie A. Niemann, Peter Benedek, Xianbiao Fu, Adam C. Nielander, Ib Chorkendorff, Thomas F. Jaramillo, Matteo Cargnello
Summary: In this study, the quantitative analysis of lithium alkoxide solid-electrolyte interphase (SEI) species and its effect on the efficiency of lithium-mediated electrochemical ammonia synthesis were investigated. The results showed that the thickness of the lithium alkoxide SEI layer significantly influenced the Faradaic efficiency, with an optimal thickness of around 4 μm.
ACS ENERGY LETTERS
(2023)
Article
Medicine, General & Internal
Stinne Byrholdt Sogaard, Sofie Bech Andersen, Iman Taghavi, Mikkel Schou, Christina Christoffersen, Jens Christian Brings Jacobsen, Hans Martin Kjer, Carsten Gundlach, Amy Mcdermott, Jorgen Arendt Jensen, Michael Bachmann Nielsen, Charlotte Mehlin Sorensen
Summary: Super-resolution ultrasound (SRUS) imaging was used to investigate the changes in renal blood vessel density and tortuosity in a type 2 diabetes rat model, with promising results for monitoring and prognosing diabetic kidney disease (DKD) in the future.
Article
Chemistry, Physical
Rasmus Nielsen, Tobias H. Hemmingsen, Tobias G. Bonczyk, Ole Hansen, Ib Chorkendorff, Peter C. K. Vesborg
Summary: This study presents a laser-annealing strategy for crystallizing selenium thin-films, improving their optoelectronic quality and providing a new approach for high-efficiency selenium solar cells.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sahil Garg, Qiucheng Xu, Asger B. Moss, Marta Mirolo, Wanyu Deng, Ib Chorkendorff, Jakub Drnec, Brian Seger
Summary: Using operando wide-angle X-ray scattering, the formation of salt precipitates and their impact on the selectivity of CO2 reduction reaction and hydrogen evolution reaction were investigated. It was found that low-solubility salts can quickly precipitate over the catalyst layer, enhancing the hydrogen evolution reaction. On the other hand, highly soluble Cs salts prevent salt precipitation and flooding of the gas diffusion layer, improving the selectivity of CO2 reduction reaction. Furthermore, diluting cation concentration in the anolyte decreases salt precipitation and improves the selectivity of CO2 reduction reaction.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)