Solid superbases can catalyze diverse reactions under mild conditions, while they suffer from aggregation of basic sites and poor stability during recycling. Here we report a new generation of solid superbases derived from K single atoms (SAs) prepared by a tandem redox strategy. The initial redox reaction takes place between base precursor KNO and graphene support, producing K O at 400 °C. Further increasing the temperature to 800 °C, the graphene reduces K O to K anchored by its vacancies, leading to the generation of K SAs (denoted as K /G). The source of basicity in the K /G is K SAs, and neighboring single atoms (NSAs) possess superbasicity, which is different from conventional basicity originated from oxygen and nitrogen atoms. Due to the superbasicity as well as high dispersion and anchoring of basic sites, the K /G shows excellent catalytic activity and stability in transesterification reaction, which is much superior to the reported catalysts.
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http://dx.doi.org/10.1002/anie.202215157 | DOI Listing |
RSC Adv
May 2024
Sinopec Research Institute of Petroleum Processing Co., Ltd. No. 18 Xueyuan Road, Haidian District Beijing 100083 P. R. China +86-10-82368547 +86-10-82368390.
The alkane cracking mechanism has been a subject of intense scrutiny, with carbonium and free radical mechanisms being two well-established pathways which correlate to solid acid catalysis and thermal cracking, respectively. However, despite an understanding of these two mechanisms, certain intricacies remain unexplored, especially when it comes to alternative reaction routes over solid base materials. This gap in the knowledge hinders optimization of the desired product selectivity of alkane cracking processes.
View Article and Find Full Text PDFCarbohydr Res
March 2024
School of Engineering, Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia.
Methods Mol Biol
February 2024
Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan.
The large variety and high concentration of O-glycans are characteristic properties of mucins and play a crucial role in their unique functions. Analyzing the O-glycans of mucins is essential for investigating the functions of mucins. Eliminative oximation is an aqueous reaction that can be used to obtain O-glycan oximes from mucins.
View Article and Find Full Text PDFInt J Mol Sci
September 2023
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Nanjing 210042, China.
Alkali-activated persulfate (PS) is widely used in situ in chemical oxidation processes; however, studies on the innovation of the alkali activation process are very limited. Two supported solid superbases, namely KNO/γ-AlO (KAl) and KNO/SBA-15/MgO (KSM), respectively, were prepared and used to activate persulfate to degrade DCF in this work. The results showed that the superbases elevated the solution pH once added and thus could catalyze persulfate to degrade diclofenac efficiently above pH 10.
View Article and Find Full Text PDFChemSusChem
October 2023
Department of Chemistry, Institute for Advanced Materials and Manufacturing, University of Tennessee, Knoxville, TN 37996, USA.
Direct air capture (DAC) of CO by solid porous materials represents an attractive "negative emission" technology. However, state-of-the-art sorbents based on supported amines still suffer from unsolved high energy consumption and stability issues. Herein, taking clues from the CO interaction with superbase-derived ionic liquids (SILs), high-performance and tunable sorbents in DAC of CO was developed by harnessing the power of CaO- and SIL-engineered sorbents.
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