Article
Chemistry, Multidisciplinary
Akbar Mahdavi-Shakib, K. B. Sravan Kumar, Todd N. Whittaker, Tianze Xie, Lars C. Grabow, Robert M. Rioux, Bert D. Chandler
Summary: H-2 adsorption on Au catalysts is weak and reversible, posing challenges for quantitative studies. By investigating H-2 adsorption on Au/TiO2 catalysts, electron transfer to the support was observed, leading to shifts in FTIR background signals, which were used to quantify H-2 adsorption. Additionally, a new H-O-H bending vibration associated with proton adsorption on distinct metal-support interface sites was identified, providing new insights into the nature and dynamics of H-2 adsorption at the Au/TiO2 interface.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Luiza Izabela Jinga, Gianina Popescu-Pelin, Gabriel Socol, Sorin Mocanu, Madalina Tudose, Daniela C. Culita, Andrei Kuncser, Petre Ionita
Summary: In this study, gold nanoparticles were deposited on titanium dioxide nanoparticles and the material was found to effectively degrade methylene blue dye in the presence of hydrogen peroxide. Longer exposure time and higher oxidant content led to up to 90% degradation of the dye. The material showed promising reusability without loss of activity.
Article
Chemistry, Physical
Aiyi Dong, Kun Li, Rentao Mu, Conghui Liu, Rongtan Li, Haoran Jia, Le Lin, Qiang Fu
Summary: The effect of D2O adsorption on D-2 activation over MgO nanocatalysts was investigated using FT-IR and TPD techniques. It was found that two sets of hydride and hydroxyl species produced from D-2 dissociation at more active and less active Mg-O pairs could be observed by FT-IR and desorb via the product of D-2. The physically adsorbed D2O overlayer was found to not affect the dissociation of D-2, as D-2 could pass through the molecular layer and access the surface-active sites.
Article
Physics, Applied
Kai Yang, Shenghui Kang, Xiaoyu Wu, Bohua Liu, Chongling Sun, Yanyan Wang
Summary: A high NIR sensitivity and spectral selectivity photothermal detector was developed by modifying a photothermal layer of reduced graphene oxide-Au nanorods hybrid. The detector converts light energy into heat and measures resistance changes. The hybrid material exhibits remarkable photothermal conversion efficiency and dependence on spectral response, resulting in high sensitivity to illumination in the wavelength range from 700 to 1000 nm.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Aiyi Dong, Le Lin, Rentao Mu, Rongtan Li, Kun Li, Chao Wang, Yunjun Cao, Yunjian Ling, Yuxiang Chen, Fan Yang, Xiulian Pan, Qiang Fu, Xinhe Bao
Summary: This study investigates the surface hydrogen species of ZnO and ZnCrOx catalysts using transmission infrared spectroscopy and temperature-programmed desorption. The results show that the surface geometry of metal oxide plays a crucial role in the evolution of hydrogen species.
Article
Polymer Science
N. Ceren Slier, Ilayda Acaroglu Degitz, Pelin Sungur, Ali Bayir, Tarik Eren
Summary: The introduction of phosphonium groups onto the surface of gold nanoparticles can enhance stability, and phosphonium-based polymers can act as both reducing and stabilizing agents for gold nanoparticles.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Jia Dong, Ze-Hua Gao, Qian-Fan Zhang, Lai-Sheng Wang
Summary: The research reports the synthesis and characterization of a gold nanohydride protected by diphosphine ligands. The nanohydride consists of an Au-22 core with two Au-11 units bridged by four H atoms and delocalized Au-H-Au bonds. It exhibits various transformations related to hydrogen and serves as a versatile model catalyst for understanding hydrogen reactions on gold nanoparticle surfaces.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Muammer Y. Yaman, Kathryn N. Guye, Maxim Ziatdinov, Hao Shen, David Baker, Sergei Kalinin, David S. Ginger
Summary: The study found that gold nanorods tend to align parallel to protein nanofibers, with this preference decreasing as salt concentration increases. Increase in specific gold nanorod attachment density with solution ionic strength is primarily dominated by non-specific binding to the substrate background.
Article
Environmental Sciences
Yasin Orooji, Bahareh Tanhaei, Ali Ayati, Soheil Hamidi Tabrizi, Marzieh Alizadeh, Fatemeh F. Bamoharram, Fatemeh Karimi, Sadegh Salmanpour, Jalal Rouhi, Safoora Afshar, Mika Sillanpaa, Rozhin Darabi, Hassan Karimi-Maleh
Summary: In this study, gold nanoparticles were well-decorated on the surface of TiO2 using HPW as reducing intermediate linkers, thereby enhancing the photocatalytic performance compared to anatase TiO2 and HPW/TiO2. The photocatalytic rate of the prepared nanocomposites increased by 6.5-fold and 4.6-fold, and the reusability study confirmed their high photocatalytic activity after three cycles.
Article
Chemistry, Physical
Dipendu Saha, Pasquale Gismondi, Kurt W. Kolasinski, Samantha L. Shumlas, Sylvie Rangan, Babak Eslami, Amy McConnell, TaeVaughn Bui, Kayla Cunfer
Summary: In this study, a composite nanofiber mat consisting of g-C3N4, gold nanoparticles (AuNPs) and polyvinylidene fluoride (PVDF) was fabricated by electrospinning. The structure and chemical properties of the mat were thoroughly investigated, revealing potential photocatalytic efficiency for applications such as dye degradation. The results showed promising performance in photocatalytic degradation of methylene blue and potential for repeated cycles.
SURFACES AND INTERFACES
(2021)
Article
Biochemical Research Methods
Franziska Beck, Carina Horn, Antje J. Baeumner
Summary: Electrochemical immunosensors offer rapid analyte quantification with high sensitivity and selectivity, but user-friendliness can often be a challenge. Using silver nanoparticles instead of gold nanoparticles in POC sensors not only improves sensitivity, but also simplifies assay protocols to meet POC requirements, achieving lower limits of detection in a 2-minute automatic measurement.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Akbar Mahdavi-Shakib, Todd N. N. Whittaker, Tae Yong Yun, K. B. Sravan Kumar, Lauren C. C. Rich, Shengguang Wang, Robert M. M. Rioux, Lars C. C. Grabow, Bert D. D. Chandler
Summary: Hydrogen spillover is the migration of H atom equivalents from metal nanoparticles to a support. This study measures weak, reversible H-2 adsorption on Au/TiO2 catalysts and determines the surface concentration of spilled-over hydrogen. The adsorption behavior of H* on the titania surface is found to increase with temperature, which is attributed to high proton mobility, configurational surface entropy, and increasing hydroxyl acid-base equilibrium constants.
Article
Chemistry, Inorganic & Nuclear
Andrey Yu. Baranov, Sofia O. Slavova, Alexey S. Berezin, Stanislav K. Petrovskii, Denis G. Samsonenko, Irina Yu. Bagryanskaya, Vladimir P. Fedin, Elena V. Grachova, Alexander V. Artem
Summary: We report a family of polynuclear complexes with Au-centered Ag4 and Cu4 tetrahedral cores. The structures of the Au@M4 clusters were experimentally determined, revealing very weak intermolecular Au-M metallophilic interactions. These compounds exhibit modest luminescence lifetimes at ambient temperature, with emission type depending on the composition of the cluster core.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Biomedical
Masayoshi Tanaka, Mirei Hayashi, Lucien Roach, Yuka Kiriki, Tetsuya Kadonosono, Takahiro Nomoto, Nobuhiro Nishiyama, Jonghoon Choi, Kevin Critchley, Stephen D. Evans, Mina Okochi
Summary: The study explored the synthesis of triangular gold nanoplates using peptides, demonstrating control over nanoplate size and properties by adjusting peptide concentration. These nanoplates showed promising potential as photothermal therapeutic agents and indicated the feasibility of synthesizing circular gold nanoplates using peptides.
ACTA BIOMATERIALIA
(2021)
Article
Chemistry, Physical
Juntian Niu, Cunxin Zhang, Haiyu Liu, Yan Jin, Riguang Zhang, Jingyu Ran
Summary: This study investigates the methane activation on Ni surface from cluster to nanoparticle through detailed DFT calculations. It is found that the surface structure of Ni cluster and nanoparticle affects their catalytic performance for methane activation, and the step/edge site shows the best performance for C-H bond activation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
F. Menegazzo, F. Pinna, M. Signoretto, V. Trevisan, F. Boccuzzi, A. Chiorino, M. Manzoli
APPLIED CATALYSIS A-GENERAL
(2009)
Article
Chemistry, Physical
Floriana Vindigni, Maela Manzoli, Tatyana Tabakova, Vasko Idakiev, Flora Boccuzzi, Anna Chiorino
APPLIED CATALYSIS B-ENVIRONMENTAL
(2012)
Article
Chemistry, Multidisciplinary
Federica Menegazzo, Francesco Pinna, Michela Signoretto, Valentina Trevisan, Flora Boccuzzi, Anna Chiorino, Maela Manzoli
Article
Chemistry, Inorganic & Nuclear
Floriana Vindigni, Maela Manzoli, Anna Chiorino, Flora Boccuzzi
Article
Chemistry, Physical
Anna Chiorino, Maela Manzoli, Federica Menegazzo, Michela Signoretto, Floriana Vindigni, Francesco Pinna, Flora Boccuzzi
JOURNAL OF CATALYSIS
(2009)
Article
Chemistry, Physical
F. Vindigni, M. Manzoli, T. Tabakova, V. Idakiev, F. Boccuzzi, A. Chiorino
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2013)
Article
Chemistry, Physical
Maela Manzoli, Floriana Vindigni, Anna Chiorino, Tatyana Tabakova, Vasko Idakiev, Flora Boccuzzi
REACTION KINETICS AND CATALYSIS LETTERS
(2007)
Article
Chemistry, Physical
Maela Manzoli, Flora Boccuzzi, Anna Chiorino, Floriana Vindigni, Weiling Deng, Maria Flytzani-Stephanopoulos
JOURNAL OF CATALYSIS
(2007)
Article
Chemistry, Physical
Floriana Vindigni, Maela Manzoli, Anna Chiorino, Tatyana Tabakova, Flora Boccuzzi
JOURNAL OF PHYSICAL CHEMISTRY B
(2006)
Article
Chemistry, Physical
T Tabakova, V Idakiev, K Tenchev, F Boccuzzi, M Manzoli, A Chiorino
APPLIED CATALYSIS B-ENVIRONMENTAL
(2006)
Article
Chemistry, Physical
F Menegazzo, M Manzoli, A Chiorino, F Boccuzzi, T Tabakova, M Signoretto, F Pinna, N Pernicone
JOURNAL OF CATALYSIS
(2006)
Article
Chemistry, Analytical
S Morandi, G Ghiotti, A Chiorino, B Bonelli, E Comini, G Sberveglieri
SENSORS AND ACTUATORS B-CHEMICAL
(2005)
Article
Materials Science, Multidisciplinary
S Morandi, G Ghiotti, A Chiorino, E Comini
Article
Chemistry, Physical
M Manzoli, A Chiorino, F Boccuzzi
APPLIED CATALYSIS B-ENVIRONMENTAL
(2005)
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.