Control of the oxidation state of copper in copper silicate SGU‐29 for efficient catalytic reduction

Abstract

In transition metal-based zeotype systems, engineering transition metal species through ion exchange, doping, and oxidation state control to achieve heterogeneous catalytic systems is considered an effective strategy to improve catalytic performance. Among these strategies, controlling the oxidation state of transition metal species is a promising method to enhance the catalytic properties. Herein, we demonstrate for the first time that zeotypes containing Cu(I) can be effectively generated through the reduction of Cu(II) to Cu(I) in [CuO 4 ] 2À in the SGU-29 framework using a hydrogen/argon gas mixture. Our results showed that reduced SGU-29 (rSGU-29) exhibited a high catalytic performance while reducing 4-nitrophenol, providing 99% conversion.

Synergistic Interaction between Ruthenium Catalysts and Grafted Niobium on SBA-15 for 2,5-Furandicarboxylic Acid Production Using 5-Hydroxymethylfurfural

“…Consequently, the introduction of Lewis acid sites alongside a minimal proportion of Brønsted acid sites is inferred to have occurred in the Nb/SBA-15 samples, resulting in an increased acidity of the Nb/SBA-15 support. This alteration in acidity is presumed to potentially impact the chemical environment of the catalytic sites within the Ru nanometer, which in turn influences the catalytic performance. − …”

Investigation of electrocatalytic activity of palladium nanoparticle for ammonia borane oxidation via single‐entity electrochemistry

“…[16][17][18] The electrocatalytic performance of NPs is influenced by factors such as size, shape, capping agent, and surface lattice structure. [19][20][21] However, traditional electroanalytical techniques used to investigate NPs have limitations when it comes to discerning the properties of individual NPs, as they rely on the ensemble behavior of NPs rather than examining single NPs individually. [22][23][24][25] Consequently, in recent years, single-entity electrochemistry (SEE) has gained popularity as a method for analyzing the electrocatalytic behavior of NPs at the single NP level.…”

Effect of co‐substitution on complex thermoelectric compounds: The Zintl phase Ba1‐xSrxZn2‐yCuySb2 system

“…Three quaternary and quinary compounds BaZn 1.76-Cu 0.24 Sb 2 , BaZn 1.58 Cu 0.42 Sb 2 , and Ba 0.91 Sr 0.09 Zn 1.70 Cu 0.30 Sb 2 were successfully synthesized by the molten Pb-metal flux method, and their isotypic crystal structures were carefully characterized by powder X-ray diffraction (PXRD) as well as single crystal x-ray diffraction (SXRD) analyses. [13][14][15][16][17][18][19][20][21] A series of DFT calculations 16,22,23 using the tight-binding linear muffin-tin orbital (TB-LMTO) method 24 was also performed to understand their electronic structures. Moreover, the resultant density of states (DOS), crystal orbital Hamilton population (COHP) curves, and electron localization function (ELF) diagrams were also thoroughly discussed to elucidate the effect of the co-substitution using both of the Sr-and Cu-substitutions on the electrical transport property.…”