Engineering Highly Dispersed Pt Species by Defects for Boosting the Reactive Desulfurization Performance

Abstract

Recently, production of a clean sulfur-free fuel and related green chemical processes have attracted the attention of researchers. The development of efficient desulfurizers is an effective strategy to meet this demand. Herein, a facile method to successfully construct W 18 O 49 nanoneedles (NNs) coupled with Pt species by a spontaneous redox reaction between reductive supports and oxidative platinum precursors was revealed. The closely arranged NNs hybrids with strong metal−support electron interaction and in situ-derived carbon are successfully constructed. The Pt species are stabilized on the defective W 18 O 49 NNs surface, which accelerates the adsorption and activation of molecular oxygen. The monolithic catalyst promotes the oxidation conversion of dibenzothiophene in the process of catalytic reactivetype desulfurization. By adjusting the reaction conditions, the catalyst shows over 99.0% dibenzothiophene conversion at only 0.8% Pt loading, and the polar products can be completely removed by extraction. Also, the catalyst showed a relatively stable regeneration and reused performance.

Synergistic Catalysis of a PtFe-Alloyed Structure on W18O49 for Boosted Sulfide Oxidation

“…In comparison to pure W 18 O 49 , the (010) plane of W 18 O 49 in PtFe/W 18 O 49 and Pt/W 18 O 49 samples is a slight negative shift to lower 2θ, which reveals that the lattice expanded W 18 O 49 after coupling with PtFe NAs. This weak lattice expansion effect indicates a strong interaction between PtFe NAs and W 18 O 49 . , Furthermore, as shown by Fourier transform infrared (FTIR) and Raman spectra, the feature structure of W 18 O 49 nanomaterials has not changed significantly and is still preserved in PtFe/W 18 O 49 nanohybrids (Figures S2 and S3 of the Supporting Information).…”

Enhanced Oxygen Activation Achieved by Robust Single Chromium Atom-Derived Catalysts in Aerobic Oxidative Desulfurization

“…In the traditional hydrodesulfurization (HDS) procedure, harsh operation conditions are required to achieve satisfied removal efficiency of ASCs (e.g., high temperature and hydrogen pressure). − Adsorptive desulfurization and extractive desulfurization pathways toward ASC removal have encountered the issues of low efficiency and tedious operation. Comparatively, cost-effective and energy-efficient ASC removal via ODS could be achieved by adapting nanocatalysts with good performance under mild conditions. ,, Besides the oxidative catalytic activity of the metal cores, nanocatalyst skeletons capable of adsorbing the as-generated products are preferred to afford high-quality fuels without further purification. , Polyoxometalates and supported noble metal species/NPs are the most widely deployed catalysts in ODS, but their applications are still limited by the complicated synthesis procedure, inferior intrinsic catalytic activity/stability, and tedious catalyst separation. , As a new frontier in heterogeneous catalysis, single-atom catalysts (SACs) are known to possess unparalleled merits in precious metal thrift, atom economy, and active site homogeneity and exhibit improved catalytic activity and task-specific selectivity in thermo-/photo-/electrocatalysis compared with the counterparts possessing large particle sizes. ,,− For example, carbon nitride-supported cobalt single atoms (SAs) performed well in ethylbenzene oxidation under air atmosphere, while the supported cobalt NPs are inert . In the field of ODS, there are only few studies focusing on the SAC-promoted procedures.…”