PtZn and PtZn intermetallic nanoparticles supported on SiO were synthesized by combining atomic layer deposition (ALD) of ZnO, incipient wetness impregnation (IWI) of Pt, and appropriate hydrogen reduction. The formation of PtZn and PtZn intermetallic nanoparticles was observed by both X-ray diffraction (XRD) and synchrotron X-ray absorption spectroscopy (XAS). STEM images showed that the 2-3 nm Pt-based intermetallic nanoparticles were uniformly dispersed on a SiO support. The relationships between Pt-Zn intermetallic phases and synthesis conditions were established. XAS measurements at Pt L and Zn K edges during hydrogen reduction provided a detailed image of surface species evolution. Owing to a combined electronic and geometric effect, PtZn exhibited much higher reactivity and stability than PtZn and Pt in both the direct dehydrogenation and oxidative dehydrogenation of ethane to ethylene reactions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/d2cp04173a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pt-ZnO Interfacial Effect on the Performance of Propane Dehydrogenation and Mechanism Study.
ACS Nano
December 2024
School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510006, China.
Bimetallic Pt-based catalysts, for example, PtZn and PtSn catalysts, have gained significant attention for addressing the poor stability and low selectivity of pristine Pt catalysts over propane dehydrogenation (PDH). However, the structures of the active sites and the corresponding catalytic mechanism of PDH are still elusive. Here, we demonstrate a spatially confined Pt-ZnO@RUB-15 catalyst (where "" is the mole ratio of Zn/Pt and RUB-15 is a layered silica), which exhibited high catalytic activity, ultrahigh selectivity (>99%), and resistance to coking at 550 °C for PDH.
View Article and Find Full Text PDFUltrafast H-Spillover in Intermetallic PtZn Induced by the Local Disorder for Excellent Electrocatalytic Hydrogen Evolution Performance.
Adv Mater
November 2024
Key Lab of advanced optoelectronic quantum architecture and measurement (Ministry of Education), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, Beijing, 100081, China.
Article Synopsis
- Ordered intermetallic Platinum-Zinc (PtZn) shows promise for hydrogen evolution reaction (HER) but struggles with activity due to zinc's H-repulsion properties.
- Researchers created I-PtZn@NPC nanoparticles using a confinement-high-temperature pyrolysis strategy, which introduces local disorder that enhances HER performance by allowing for faster hydrogen migration.
- The modified material demonstrated impressive results, with a very low overpotential compared to commercial platinum catalysts, and successfully operated in a proton exchange membrane electrolyzer for extended periods.
Integrated Catalyst ZnNC⊂PtZn for High-Performance Ethanol Electrooxidation and DEFC.
Angew Chem Int Ed Engl
November 2024
Key Lab of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
We report here an electrocatalyst that exhibits superior performance in the electrooxidation of ethanol. The reactive centers of the catalyst have a nest-type configuration with outer Zn-NC nest covering inner PtZn intermetallic compound nanoparticles loaded on carbon support (ZnNC⊂PtZn/C). The high-energy stepped facets of the inner PtZn nanoparticles confined and shaped by the outer Zn-NC nest is highly active for the critical C-C bond cleavage of ethanol in oxidation, confirmed by experimental characterizations and density functional theory calculations.
View Article and Find Full Text PDFComparative Study of PtM (M=Cu, Zn, Ga, Mn, Fe, In, Ce) Bimetals on Zincosilicate for Propane Dehydrogenation Reaction.
Chemistry
December 2024
Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Fine Chemical Industry Research Institute, School of Chemistry, IGCME, Sun Yat-sen University, Guangzhou, 510275, China.
Silicoaluminate zeolites have relatively strong Brönsted (B) acid properties that can easily lead to deep cracking reactions, making them less favourable as carriers for propane dehydrogenation. Here, we utilise zincosilicate zeolite with less B-acid produced by the introduction of the heteroatom Zn into the framework as a carrier, followed by simultaneous ion exchange (IE) of M monometallic or PtM bimetallic (M=Cu, Zn and Ga, etc.).
View Article and Find Full Text PDFD-Band-Center-Engineered Platinum-Based Nanozyme for Personalized Pharmacovigilance.
Angew Chem Int Ed Engl
September 2024
Key Laboratory for Analytical Science of Food Safety and Biology (MOE & Fujian Province), Department of Chemistry, Fuzhou University, Fuzhou, 350108, China.
A high-efficiency PtZnCd nanozyme was screened with density functional theory (DFT) and unique d-orbital coupling features for sensitive enrichment and real-time analysis of CO-releasing molecule-3 (CORM-3). Multicatalytic sites in the nanozyme showed a high reactivity of up to 72.89 min for peroxidase (POD)-like reaction, which was 2.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!