Controllable Conversion of CO 2 on Non‐Metallic Gold Clusters

Hao

Crystal Research and Technology

et al. 2021

A new 3D organo-silver(I) crystalline complex of [(MPC) 4 (CF 3 COO) 8 Ag 10 ] n (MPC = 4-methyl-7-propargyloxy coumarin) (JMSU-Ag 10 ) has been successfully synthesized. The crystal structure analysis shows that the 10-core silver(I) cluster (Ag 10 ) can be considered as the subunit of JMSU-Ag 10 with different Ag⋯Ag argentophilic interactions. By the protection of organic ligands and Ag⋯Ag interactions, the Ag 10 subunits further compose a chain structure, and then the trifluoroacetate or the MPC ligands bridge the 1D silver(I) chains along different directions to form the 3D framework. Furthermore, JMSU-Ag 10 can be used to detect the hydrazine due to that the Ag + ions can be reduced to Ag 0 species with strong UV-vis absorption. Interestingly, the reduced JMSU-Ag 10 by hydrazine can be further used to catalyze the reduction of 4-nitrophenol to form 4-aminophenol. This work provides a new strategy for the design, synthesis, and the cyclic utilization of functional organo-silver(I) crystalline materials.

Section: Introductionmentioning

confidence: 99%

Coumarin Derivative Induced 3D Organo‐Silver(I) Complex with Tandem Hydrazine Detection and 4‐Nitrophenol Catalysis

Hao

Crystal Research and Technology

et al. 2021

“…[1] Therefore, the development of efficient CO 2 capture and utilization systems and new technologies to diminish CO 2 emissions has attracted considerable interests from both academia and industry. [2][3][4] With the assistance of H 2 generated from clean energies (water, wind, sunlight, etc. ), hydrogenating CO 2 via thermo-catalysis can not only mitigate CO 2 emissions, but also effective in providing valuable organic chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past centuries, excessive reliance on fossil fuels has resulted in huge amounts of CO 2 emissions, with CO 2 being the major cause of serious environmental challenges such as global warming, ocean acidification, and climate change [1] . Therefore, the development of efficient CO 2 capture and utilization systems and new technologies to diminish CO 2 emissions has attracted considerable interests from both academia and industry [2–4] . With the assistance of H 2 generated from clean energies (water, wind, sunlight, etc.…”

Section: Introductionmentioning

confidence: 99%

Potassium as a Versatile Promoter to Tailor the Distribution of the Olefins in CO₂ Hydrogenation over Iron‐Based Catalyst

Qiao

Wang

et al. 2022

ChemCatChem

= ) of 40 % and 27 μmol CO2 g Fe À 1 s À 1 , respectively, were obtained at 3 wt% of K under the same reaction conditions. At 3 wt% of K and above, the overall selectivity to the olefins (inclusive of light olefins and heavy olefins) remained at as high as ca. 60 % at high CO 2 conversion of ca. 50 %. Comprehensive characterizations revealed that the K promoter enhanced the basicity of the catalyst, which facilitates the formation of χ-Fe 5 C 2 , the key active phase for CO 2 hydrogenation. A good linear relationship is established between the surface basicity and the content of χ-Fe 5 C 2 . Moreover, the K promoter weakened the adsorption of the olefins, which inhibited the secondary hydrogenation of the olefins, thus improving the selectivity to the olefins. This work demonstrates that K is a highly promising promoter for the tailoring of the types of the olefinic products in CO 2 hydrogenation.

“…Currently, the surface and interface catalysis of catalysts is always in the research spotlight, as the chemical reactions can directly occur on the surface or interface of the catalysts [35–38] . However, investigations on the roles of internal atoms of the catalysts in determining the catalytic properties are still in the infancy, due to the difficulty of correlating the conventional characterization information with inner structure of a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Contributions of Internal Atoms of Atomically Precise Metal Nanoclusters to Catalytic Performances

Cai

Sun

et al. 2021

Chemistry A European J

Self Cite

Every atom of a heterogeneous catalyst can play a direct or indirect role in its overall catalytic properties. However, it is extremely challenging to determine explicitly which atom(s) of a catalyst can contribute most to its catalytic performance because the observed performance usually reflects an average of all the atoms in the catalyst. The emergence of atomically precise metal nanoclusters brings unprecedented opportunities to address these central issues, as the crystal structures of such nanoclusters have been solved, and hence very fundamental understanding of nanocatalysis can be attained at an atomic level. This minireview focuses on recent efforts to reveal the contributions of the internal atoms or vacancies of nanocluster catalysts to the catalytic processes, including how the catalytic activity can be dramatically changed by the central doping of a foreign atom, how catalytic activation and inactivation can be reversibly switched by shuttling the central atom into and out of nanoclusters, and how evolution in catalytic activity can be driven by structural periodicity in the inner kernels of the nanoclusters. We anticipate that progress in this research area could represent a novel conceptual framework for understanding the crucial roles of internal atoms of the catalysts in tuning the catalytic properties.