Pregled bibliografske jedinice broj: 949997
Shape-Controlled CeO2 Nanoparticles: Stability and Activity in the Catalyzed HCl Oxidation Reaction
Shape-Controlled CeO2 Nanoparticles: Stability and Activity in the Catalyzed HCl Oxidation Reaction // ACS Catalysis, 7 (2017), 10; 6453-6463 doi:10.1021/acscatal.7b01618 (međunarodna recenzija, članak, znanstveni)
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Naslov
Shape-Controlled CeO2 Nanoparticles: Stability and Activity in the Catalyzed HCl Oxidation Reaction
Autori
Li, Chenwei ; Sun, Yu ; Djerdj, Igor ; Voepel, Pascal ; Sack, Carl-Christian ; Weller, Tobias ; Ellinghaus, Rüdiger ; Sann, Joachim ; Guo, Yanglong ; Smarsly, Bernd M. ; Over, Herbert
Izvornik
ACS Catalysis (2155-5435) 7
(2017), 10;
6453-6463
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
Deacon process ; CeO2 ; shape controlled particles ; structure sensitivity ; stability ; activity
Sažetak
CeO2 is a promising catalyst for the HCl oxidation (Deacon process) in order to recover Cl2. Employing shape-controlled CeO2 nanoparticles (cubes, octahedrons, rods) with facets of preferential orientations ((100), (111), (110)), we studied the activity and stability under two reaction conditions (harsh: Ar:HCl:O2 = 6:2:2 and mild: Ar:HCl:O2 = 7:1:2). It turns out that both activity and stability are structure-sensitive. In terms of space time yield (STY), the rods are the most active particles, followed by the cubes and finally the octahedrons. This very same trend is reconciled with the complete oxygen storage capacity (OSCc), indicating a correlation between the observed activity STY and the OSCc. The apparent activation energies are about 50 kJ/mol for cubes and rods, while the octahedrons reveal an apparent activation energy of 65 kJ/mol. The reaction order in O2 is positive (0.26–0.32). Under mild reaction conditions, all three morphologies are stable, consistent with corresponding studies of CeO2 powders and CeO2 nanofibers. Under harsh reaction conditions, however, cubes and octahedrons are both instable, forming hydrated CeCl3, while rods are still stable. The present stability and activity experiments in the catalytic HCl oxidation reaction over shape- controlled CeO2 nanoparticles may serve as benchmarks for future ab initio studies of the catalyzed HCl oxidation reaction over well- defined CeO2 surfaces.
Izvorni jezik
Engleski
Znanstvena područja
Fizika, Kemija
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
