Article
Chemistry, Inorganic & Nuclear
Yohei Takashima, Seiko Tetsusashi, Mai Takano, Shintaro Tanaka, Yui Murakami, Takaaki Tsuruoka, Kensuke Akamatsu
Summary: In this study, we demonstrated the direct synthesis of sodium dihydrogen phosphate (PA) containing palladium nanoparticles (PdNPs) supported on a metal-organic framework (MOF). The resulting composite containing PA molecules coexisting with PdNPs demonstrated improved hydrogenation catalytic performance compared to the composites without PA.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Jiangang Lv, Di Wang, Xuefeng Guo, Weiping Ding, Weimin Yang
Summary: High-energy facets exposed nanotubular alumina and conventional alumina supported Pd catalysts were synthesized and applied to selective hydrogenation of phenylacetylene. The novel alumina supported catalyst exhibited higher selectivity at complete conversion of phenylacetylene, which can be attributed to the well dispersion of Pd and strong metal-support interaction resulting from the unique structural properties of the crystal plane regulated alumina. It facilitates the creation of more active sites for hydrogenation, while promoting the desorption of alkenes and suppressing excessive hydrogenation towards ethylbenzene.
CATALYSIS COMMUNICATIONS
(2023)
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, Inorganic & Nuclear
Csilla Eniko Czegeni, Henrietta Kovacs, Gabor Papp, Agnes Katho, Ferenc Joo
Summary: Anion-exchange resin-supported palladium catalysts are prepared by immobilizing Pd(II) on anion-exchange resins followed by reduction in hydrogen atmosphere. These catalysts exhibit high catalytic activity and selectivity in the dehalogenation of aromatic halides through hydrogen transfer from aqueous sodium formate in water-ionic liquid mixtures under batch conditions and hydrogenation in ethanol under moderate pressure of H2 in a continuous flow microreactor.
INORGANICA CHIMICA ACTA
(2023)
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
Polymer Science
Alima Zharmagambetova, Eldar Talgatov, Assemgul Auyezkhanova, Nurmukhamet Tumabayev, Farida Bukharbayeva
Summary: Magnetic nanoparticles have gained attention as catalyst supports due to their magnetic separation capability for easy recovery. A proposed synthesis method showed improved activity and lifespan for the Pd magnetic catalyst. The catalyst exhibited high activity and selectivity in phenylacetylene hydrogenation, and could be magnetically recovered and reused multiple times.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Kaihui Li, Junyuan Xu, Huan Zhang, Lihua Zhu
Summary: In this study, Pd/WO3 catalysts with different Pd contents were prepared via sodium borohydride liquid phase reduction and used for phenol selective hydrogenation. The Pd/WO3-2 catalyst showed excellent catalytic performance with 92.9% conversion, 84.4% selectivity, and high TOF (349.1 h(-1)) under the reaction conditions.
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
Engineering, Environmental
Xiaowen Lu, Tingting Luo, Mingyang Zhang, J. Hugh Horton, Qiong Wu, Wei Wu, Man Qiao, Yu Wang, Zhijun Li
Summary: The size and geometry of supported metal ensembles are crucial in the design of effective heterogeneous catalysts. In this study, supported single atomic-layered, low-nuclearity palladium catalysts were created using an electronic and structural engineering strategy. These atomically dispersed Pd catalysts exhibited excellent catalytic activity in the hydrogenation of levulinic acid to 1,4-pentanediol, a reaction of importance for biomass conversion. Theoretical calculations revealed that the high catalytic activity was a result of cooperation between adjacent Pd atoms and strong electronic metal-support interactions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Bon Seung Goo, Kyungrok Ham, Yeji Han, Seunghoon Lee, Hayoon Jung, Yongmin Kwon, Youngmin Kim, Jong Wook Hong, Sang Woo Han
Summary: This study developed a novel approach to investigate the intrinsic catalytic reactivity of edge and terrace atoms in nanocrystal catalysts. By comparing the catalytic behaviors of edge-covered Pd NCs with those of pristine Pd NCs, researchers successfully decoupled the activity of edge and {110}-plane atoms.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Bon Seung Goo, Kyungrok Ham, Yeji Han, Seunghoon Lee, Hayoon Jung, Yongmin Kwon, Youngmin Kim, Jong Wook Hong, Sang Woo Han
Summary: This study successfully decouples the activity of the edge and {110}-plane atoms of Pd NCs by comparing the catalytic behaviors of edge-covered Pd NCs with pristine Pd NCs, providing a new method for more precise examination of the surface properties of various NC catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Biochemistry & Molecular Biology
Xinxiang Cao, Ben W. -L. Jang, Jiaxue Hu, Lei Wang, Siqi Zhang
Summary: Selective semi-hydrogenation of acetylene is important both in industry and theory. Palladium is the most active metal and is widely used for this reaction, but it has poor selectivity towards ethylene. A commonly used strategy to improve the catalytic performance is introducing a secondary metal to tune the geometric and electronic structures of Pd nanoparticles. Various supported Pd-based bimetallic catalysts have been studied in the past decade, and their preparation methods, advantages, and disadvantages are summarized in this review.
Article
Chemistry, Physical
Mingyu Chu, Qi Pan, Wenyi Bian, Yu Liu, Muhan Cao, Congyang Zhang, Haiping Lin, Qiao Zhang, Yong Xu
Summary: This study reports the first example of strong metal-support interaction (SMSI) between palladium and gallium oxide within PdGa nanoparticles, demonstrating the important role of PdGa alloy and Ga2O3 coexistence in the formation of SMSI. The PdxGay NPs used as catalysts show higher catalytic performance for propyne semi-hydrogenation compared to conventional catalysts, indicating their potential in catalyst design and application. The reaction pathways of PSH on PdxGay NPs have been further elucidated by density functional theory calculations, providing a deeper understanding of SMSI and its implications for heterogeneous catalysis.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Tomohiro Yasukawa, Karin Sakamoto, Yasuhiro Yamashita, Shu Kobayashi
Summary: This study developed a catalyst with nitrogen-doped carbon as a carrier to achieve the homologation of aryl aldehydes, which showed excellent performance in terms of selectivity, activity, and reusability.
Review
Chemistry, Multidisciplinary
Kun Lu, Xiao Kong, Junmeng Cai, Shirui Yu, Xingguang Zhang
Summary: Heterogeneous catalysts of supported metals play a crucial role in the petrochemical industry and the production of bulk or fine chemicals and pharmaceuticals. Conventional supported metal catalysts often suffer from deactivation, but strategies like complete encapsulation or core-shell arrangements have been explored. This review focuses on the use of partial/porous overlayers to preserve metals and control the accessibility of active sites in catalytic reactions.
Article
Chemistry, Organic
Fuying Zhu, Yamei Lin
Summary: In this study, a low-metal iron-supported catalyst (Fe20/NC-Mg) was reported for the efficient synthesis of quinoxaline compounds, using water as a solvent and without additional bases. The synergistic effect of FeNx site and Mg (OH)2 nanorods in the catalyst played a key role in achieving high yields (82-91%) in 16 examples. The gram-level synthesis and reusability of the catalysts after four cycles demonstrated its industrial application potential.
Article
Chemistry, Organic
Mikhail Kozlov, Alexey Tyurin, Andrey Dmitrenok, Vyacheslav Rusak, Aleksander Fedorov, Igor Zavarzin, Yulia Volkova
Summary: This study presents a novel and practical synthesis method for phosphorus-substituted 1,3,4-thiadiazolines using phosphorylthioformic acid hydrazides and ketones. The protocol demonstrates operational simplicity, availability of reagents, and tolerance towards different functional groups.
Article
Chemistry, Organic
Jisna Jose, Thomas Mathew
Summary: 2-Cyclopentenone and its derivatives are highly esteemed synthetic intermediates with exceptional utility in organic synthesis. They are favored structural motifs in numerous pharmaceutical drugs and natural products, highlighting their significance. The review discusses the various methods used to synthesize cyclopentenones from 2016 to 2023.