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Titolo:
Isotopic studies on the mechanism of partial oxidation of CH4 to syngas over a Ni/Al2O3 catalyst
Autore:
Li, CY; Yu, CC; Shen, SK;
Indirizzi:
Univ Petr, Coll Chem & Chem Engn, Dongying 257061, Shandong Prov, Peoples R China Univ Petr Dongying Shandong Prov Peoples R China 257061 , Peoples R China Univ Petr, Catalyt Key Lab CNPC, Beijing 102200, Peoples R China Univ Petr Beijing Peoples R China 102200 Beijing 102200, Peoples R China
Titolo Testata:
CATALYSIS LETTERS
fascicolo: 3-4, volume: 75, anno: 2001,
pagine: 183 - 189
SICI:
1011-372X(2001)75:3-4<183:ISOTMO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYNTHESIS GAS-FORMATION; EARTH-OXIDE CATALYSTS; SELECTIVE OXIDATION; CARBON-MONOXIDE; METHANE CONVERSION; CO; TEMPERATURES; MONOLITHS; HYDROGEN; DIOXIDE;
Keywords:
methane; partial oxidation; syngas; mechanism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Li, CY Univ Petr, Coll Chem & Chem Engn, Dongying 257061, Shandong Prov, Peoples R China Univ Petr Dongying Shandong Prov Peoples R China 257061 es R China
Citazione:
C.Y. Li et al., "Isotopic studies on the mechanism of partial oxidation of CH4 to syngas over a Ni/Al2O3 catalyst", CATAL LETT, 75(3-4), 2001, pp. 183-189

Abstract

An isotopic transient technique and XPS were used to investigate the mechanism of partial oxidation of CH4 to syngas over a Ni/Al2O3 catalyst at atmospheric pressure and 700 degreesC. The experimental results show that CH4 can decompose easily and quickly to H-2 and NixC over the reduced catalyst, and NixC can react rapidly with NiO from Ni oxidized by O-2 to CO or CO2 depending on the relative concentration of NixC around NiO on the catalyst surface. Both H2 and CO are primary products in partial oxidation of CH4. Isotopic tracing experiments prove that most Of CO2 produced during partial oxidation of CH4 is from the surface reaction between NixC and NiO, and it isimpossible to mainly originate from the further oxidation of CO or the disproportionation of CO. The disproportionation of CO may happen at the experimental conditions, limited by thermodynamic equilibrium, however, the conversion of CO is very low. The pulse experiments of CH4/O-2 and CH4/CO2 withstoichiometric ratio show that the rate of partial oxidation of CH4 is faster than that of CH4 reforming with CO2, this implies that partial oxidation of CH4 is unlikely to proceed via a combustion reforming mechanism. All the results support the direct oxidation mechanism: H-2 is from CH4 decomposition and CO is the product of the surface reaction between NixC and NiO.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 04:21:50