Article
Biochemistry & Molecular Biology
Viktoria Hajdu, Adam Prekob, Gabor Muranszky, Ferenc Kristaly, Lajos Daroczi, Lajos Harasztosi, Zoltan Kaleta, Bela Viskolcz, Miklos Nagy, Laszlo Vanyorek
Summary: To address the challenges in the development of industrial catalysts, researchers have prepared intelligent, magnetizable NiFe2O4- and CoFe2O4-supported palladium catalysts that can be easily recovered by magnetic separation. The easy and fast preparation method involved solvothermal synthesis and sonochemical decomposition. Amino functionalization of the supports enhanced the metal-support interaction. The amine-functionalized catalysts showed better stability and retained high activity due to reduced palladium leaching.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Mohamed Sadou, Adel Saadi, Mohammed Hadj Meliani, Rami K. Suleiman, Tawfik A. Saleh
Summary: A facile synthetic method was used to prepare copper-modified SBA-15 catalysts. The catalysts showed high activity, which could be attributed to the well-dispersed copper nanoparticles on the mesoporous support.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Applied
Hojeong Lee, Chinh Nguyen-Huy, Eun Jeong Jang, Jihyeon Lee, Euiseob Yang, Man Sig Lee, Ja Hun Kwak, Kwangjin An
Summary: The study shows that different types of mesoporous oxide supports have a significant impact on Pd dispersion and the redox behavior of Pd, thus influencing the product selectivity in catalytic furfural hydrogenation. Among the catalysts tested, Pd/Co3O4 exhibits the highest furfural conversion and selectivity towards 2-methylfuran.
Article
Materials Science, Multidisciplinary
Viktoria Hajdu, Gabor Muranszky, Adam Prekob, Ferenc Kristaly, Bela Fiser, Janos Lakatos, Bela Viskolcz, Laszlo Vanyorek
Summary: This study investigates the application of transition metal-containing ferrites decorated with palladium catalysts in the hydrogenation of nitrobenzene. Three magnetic catalysts were prepared using sonochemical and combustion steps, and the Pd/ZnFe2O4 and Pd/NiZnFeO4 catalysts exhibited the highest activity, achieving high yields in a short reaction time.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Javier Navarro-Ruiz, Camila Rivera-Carcamo, Bruno Machado, Philippe Serp, Iker Del Rosal, Iann C. Gerber
Summary: The choice of support is crucial for the preparation of metal catalysts, as it influences the anchoring of metal species and can lead to efficient metal/support combinations for catalysis. First-principles studies were conducted on O-functionalized graphene as a model carbon support, a single Pd atom, and a Pd-13 nanocluster to describe their geometric and electronic properties. The oxygenated carbon-based support showed a metallic character with embedded Pd ion and nanocluster, and the hydrogenation process of the adsorbed cluster indicated high thermal stability and unity ratio between adsorbed hydrides and surface metal atoms at room temperature.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Applied
Eleonora Vottero, Michele Carosso, Riccardo Pellegrini, Monica Jimenez-Ruiz, Elena Groppo, Andrea Piovano
Summary: In this article, the behavior of activated carbon and Pt and Pd catalysts in the presence of H2 was investigated using Inelastic Neutron Scattering (INS) spectroscopy. The INS spectra provided detailed information about H2 physisorption and the formation of metal hydrides upon hydrogenation. The occurrence of hydrogen spillover from the metal nanoparticles onto the activated carbon was also observed. Overall, this work provides important insights for better understanding the complex interaction between H2 and Pt and Pd-loaded activated carbon catalysts.
Article
Chemistry, Physical
Xiqiang Tian, Muhammad Zahid, Wang Sun, Yujun Zhu
Summary: Different morphologies of TiO2 supports can lead to varied surface properties and catalytic activities of catalysts. This study synthesized three-dimensional hierarchical structure TiO2 using a novel evaporation-induced assisted hydrothermal approach, controlling morphology and size by adjusting the amount of Brij-35. The TiO2 supported palladium catalysts showed remarkable catalytic activity in selective hydrogenation of 4-nitrophenol due to the specific hierarchical structure and higher surface area of TiO2-SUT.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Haohao Wang, Fuxing Shi, Min Pu, Ming Lei
Summary: This study investigates the activities of 12 late transition metal single-atom-supported nitrogen-doped carbon-based catalysts in nitrobenzene hydrogenation. The results indicate that Ru-1-N-4/C SAC could be one of the most promising catalysts with good catalytic activities for nitrobenzene hydrogenation.
Article
Green & Sustainable Science & Technology
David Carvajal, Ramon Arcas, Camilo A. Mesa, Sixto Gimenez, Francisco Fabregat-Santiago, Elena Mas-Marza
Summary: This article focuses on the electrochemical reduction and hydrogenation of nitrobenzene to aniline using Cu/Pd electrodes. The study found that the deposition of Pd on the surface of the Cu electrode can decrease the overpotential for nitrobenzene reduction and improve the rate and selectivity of aniline production. Impedance spectroscopy analysis indicates that Pd enhances the production of H* radicals, which are necessary for the nitrobenzene reduction process.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Nanoscience & Nanotechnology
Adam Prekob, Gabor Muranszky, Milan Szori, Gabor Karacs, Ferenc Kristaly, Tibor Ferenczi, Bela Fiser, Bela Viskolcz, Laszlo Vanyorek
Summary: Carbon black-supported palladium-platinum catalysts were prepared with and without nickel(II) oxide or iron(III) oxide promoter materials using ultrasonic cavitation technology. The one-step catalyst preparation method without the need for post-treatments showed excellent catalytic activity in the hydrogenation of nitrobenzene, with no significant differences in selectivity and aniline yield observed even when promoters were present.
Article
Chemistry, Physical
Weiyu Wang, Qiang Wang, Yueying Chu, Guodong Qi, Shenhui Li, Jun Xu, Feng Deng
Summary: Alkyne semihydrogenation is a key method for synthesizing stereodefined molecules. The study investigates the stereoselective hydrogenation of propyne to propene using Al2O3-supported Pd-Ag bimetallic catalysts, adjusting properties by altering Pd and Ag components. The higher Ag concentration in Pd-Ag catalysts promotes a stronger pairwise syn-addition to propyne and a higher PHIP effect.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Applied
Dandan Mu, Zhuwan Li, Siyu Yu, Shetian Liu
Summary: Hydrodechlorination (HDC) via heterogeneous catalysis using liquid hydrogen donors is an effective method for degrading and removing chlorophenols. In this study, Pd and Pd-M (M=Zn, Ni, Co) catalysts supported on commercial multiwall carbon nanotubes (MWCNTs) and N-doped MWCNTs (N-MWCNTs) were used to investigate their catalytic performances for the HDC of 2-chlorophenol (2-CP) using methanol as the hydrogen donor. The results showed that N-doping and/or the addition of a second metal effectively increased the catalytic activity of the Pd catalysts, achieving nearly 100% conversion of 2-CP using Pd-Zn/N-MWCNTs. Characterization techniques were employed to better understand the reaction mechanism and the effects of N-doping and the addition of a second transition metal to the catalyst.
Article
Energy & Fuels
Thanadon Supabunnapong, Artita Na Rungsi, Apanee Luengnaruemitchai, Shih-Yuan Chen, Takehisa Mochizuki, Natthida Numwong, Nuwong Chollacoop
Summary: In this study, mesoporous silica (SBA-15)-supported Pd catalysts (Pd/SBA-15) with different sizes of Pd particles were prepared under different calcination conditions. These catalysts were used for the partial hydrogenation of soybean-oil-derived biodiesel fuel. The results showed that the size of Pd particles strongly influenced the hydrogenation rate and selectivity, affecting the composition and fuel properties of the partially hydrogenated fatty acid methyl esters (H-FAME).
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Physical
Claudia E. Berdugo-Diaz, Yang Sik Yun, Melissa T. Manetsch, Jing Luo, David G. Barton, Xue Chen, David W. Flaherty
Summary: The direct reduction of esters to ethers offers an efficient pathway to obtain ethers from renewable intermediates. This study elucidates the reaction pathways of propyl acetate in the presence of hydrogen over Pd nanoparticles supported on high-surface area Nb2O5. The results show that esters react via three primary pathways, leading to the formation of different products. The formation of ethers is not affected by the pressure of C5H10O2 but is dependent on the pressure of H-2.
Article
Chemistry, Multidisciplinary
Rafael T. P. da Silva, Susana I. Cordoba De Torresi, Paulo F. M. de Oliveira
Summary: Silver-gold nanoalloys were synthesized using mechanochemical synthesis, without the use of any stabilizing agent. These nanoalloys exhibited enhanced catalytic activity in the hydrogenation of 2-nitroaniline. This method allows for the direct synthesis of nanoparticles in the solid-state with clean surfaces and available catalytic sites.
FRONTIERS IN CHEMISTRY
(2022)
