Details

Autor(en) / Beteiligte

• Li, Yuxin
• Han, Wei
• Wang, Ruixuan
• Weng, Lu-Tao
• Serrano-Lotina, Ana
• Bañares, Miguel A.
• Wang, Qingyue
• Yeung, King Lun

Titel

Performance of an aliovalent-substituted CoCeOx catalyst from bimetallic MOF for VOC oxidation in air

Ist Teil von

• Applied catalysis. B, Environmental, 2020-10, Vol.275, p.119121, Article 119121

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] Relationship between catalytic performance and oxygen vacancy defects (OVac) of conversion and CoCeOx, Co3O4/CeO2, and CeO2 nanocubes (NCs) catalysts. •A aliovalent-substituted CoCeOx catalyst was derived from bimetallic MOF.•The aliovalent substitution of cobalt ions into ceria generates oxygen vacancies.•The as-prepared CoCeOx has shown high reactivity in the oxidation of various VOCs.•The catalytic activity of CoCeOx correlates well with abundant oxygen vacancies.•The methodology can be easily applied to produce mixed metal oxides. The aliovalent-substitution of cobalt into ceria lattice was demonstrated using a bimetallic CoCeBDC MOF to achieve a high degree of atomic level mixing in the CoCeOx catalyst. Spectroscopic analyses including X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and time-of-flight secondary ion mass spectrometry (ToF-SIMS) confirmed the successful insertion of cobalt atom with a concomitant increase in defects (i.e., Raman ID/IF2g = 0.25) and oxygen vacancies (i.e., XPS Oβ/(Oα+Oβ) = 0.33) that correlates well with catalytic activity for the oxidations of methanol, acetone, toluene, and o-xylene. The as-prepared CoCeOx performed a 50% conversion (T50) and 90% conversion (T90) in toluene oxidation at 212 °C and 227 °C that are significantly lower than the reference Co3O4/CeO2 nanocube catalyst that had T50 of 261 °C and T90 of 308 °C, indicating its better catalytic activity. Moreover, CoCeOx catalyst completely oxidizes organic compounds to carbon dioxide and water, while reaction over Co3O4/CeO2 nanocube catalyst produces significant carbon monoxide.