98%
921
2 minutes
20
The Pd-catalyzed C-H activation of natural tryptophan residues has emerged as a promising approach for their direct synthetic modification. While using water as the solvent and harnessing air as the oxidant is enticing, these conditions induce catalyst deactivation by promoting the formation of inactive Pd(0) clusters. In this work, we have studied optimized Pd-based catalytic systems via nonsteady state kinetic analysis and X-ray absorption spectroscopy (XAS) to overcome catalyst deactivation, which enables the effective use of lower Pd loadings.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11075009 | PMC |
http://dx.doi.org/10.1021/acscatal.4c01699 | DOI Listing |
Nanotechnology
September 2025
China University of Petroleum Beijing, No.18, Fuxue Road, Changping District, Beijing 102249, China, Changping, Beijing, 102249, CHINA.
In fluid catalytic cracking (FCC) processes, vanadium is a primary harmful feedstock contaminant that deactivates catalysts by forming vanadate species which corrode the zeolite framework and damage catalyst structure. Introducing vanadium capture agents is an effective way to enhance the catalytic performance, but the mechanism of the interaction has not yet been fully understood. This study demonstrates that lanthanum-based additives significantly improve vanadium resistance in FCC catalysts.
View Article and Find Full Text PDFWater Res
August 2025
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Catalysts for heterogeneous advanced oxidation processes (AOPs) in water remediation face environmental sustainability challenges, due to the intensive production of catalysts and limited stability of catalysts while maintaining high efficiency. Herein, we design a biomimetic carbon catalyst (BCC) inspired by the diatom frustule valve structure, achieving high environmental sustainability while maintaining superior water decontamination performance by a non-radical direct electron transfer (DET) pathway through activating peracetic acid (PAA). Utilizing a hydrogen-bonding strategy, BCC features pillared layered hierarchical pores with an ultrahigh specific surface area of 2710.
View Article and Find Full Text PDFEnviron Sci Technol
September 2025
School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, P.R. China.
Volatile organic compounds (VOCs) significantly impact air quality as photochemical smog precursors and health hazards. Catalytic oxidation is a leading VOC abatement method but suffers from catalyst deactivation due to metal sintering and competitive adsorption in complex mixtures. Strong metal-support interactions (SMSIs) provide atomic level control of interfacial electronic and geometric structures.
View Article and Find Full Text PDFEnviron Res
September 2025
National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China. Electronic address:
Heterogeneous Fenton-like reactions have broadened the pH adaptation window of traditional homogeneous Fenton during water purification. However, the sharp decrease in their activity under macro-neutral conditions is still a large challenge. More importantly, although it has been realized that the pH value always changes during the heterogeneous Fenton-like process, there are still a few research focuses on the degradation mechanisms in different pH systems, especially the difference between initial neutral and the buffered neutral system.
View Article and Find Full Text PDFSci Total Environ
September 2025
Department of Mechanical Engineering, University of Port Harcourt, Rivers State, Nigeria.
The urgent need to reduce fossil fuel emissions demands advanced control technologies beyond conventional catalysts. This review uniquely offers a comprehensive analysis of composite catalysts tailored to capture the full spectrum of fossil fuel pollutants, unlike prior studies that address individual emissions separately. It covers fundamental principles, reaction mechanisms, and recent material innovations, emphasizing multi-metallic, nanostructured, and hybrid catalyst designs.
View Article and Find Full Text PDF