Plasma-assisted manipulation of vanadia nanoclusters for efficient selective catalytic reduction of NO<sub>x</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38678057.
- Also identified by DOI 10.1038/s41467-024-47878-1 and PMC identifier 11055856.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Supported nanoclusters (SNCs) with distinct geometric and electronic structures have garnered significant attention in the field of heterogeneous catalysis. However, their directed synthesis remains a challenge due to limited efficient approaches. This study presents a plasma-assisted treatment strategy to achieve supported metal oxide nanoclusters from a rapid transformation of monomeric dispersed metal oxides. As a case study, oligomeric vanadia-dominated surface sites were derived from the classic supported V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> (VWT) catalyst and showed nearly an order of magnitude increase in turnover frequency (TOF) value via an H<sub>2</sub>-plasma treatment for selective catalytic reduction of NO with NH<sub>3</sub>. Such oligomeric surface VO<sub>x</sub> sites were not only successfully observed and firstly distinguished from WO<sub>x</sub> and TiO<sub>2</sub> by advanced electron microscopy, but also facilitated the generation of surface amide and nitrates intermediates that enable barrier-less steps in the SCR reaction as observed by modulation excitation spectroscopy technologies and predicted DFT calculations.