Ni-containing CeO [sub] 2 rods for dry reforming of methane

activity tests and a multiscale lattice Boltzmann model analysis in two model geometries

Filip Strniša (Author), T. Vikram Sagar (Author), Petar Djinović (Author), Albin Pintar (Author), Igor Plazl (Author)

Abstract

Experimental and theoretical modeling on low-temperature dry methane reforming over Ni-containing CeO$_2$ rods was studied. The catalyst was characterized by means of N$_2$ physisorption, in-situ XRD, TPR and H$_2$ chemisorption techniques. The characterization studies revealed the distortion of CeO$_2$ flourite structure due to the Ni incorporation. Lattice expansion (due to reduction) and contraction (due to oxidation) suggest the reversible redox nature of CeO$_2$. Ni–O–Ce solid solution formation was evidenced by both XRD and TPR studies. H$_2$ chemisorption study revealed that the catalyst reduction temperature plays a significant role in Ni dispersion. The catalyst showed similar activity trends in two model geometries: a between-two-plates microchannel fixed-bed reactor and a conventional fixed-bed reactor. The activity tests were conducted in the kinetic regime, where conversions of CH$_4$ were not influenced with the gas flow rate. A lattice Boltzmann model for mixed gas flow was developed along with a boundary condition for catalytic sites. The lattice Boltzmann model was used in a multiscale simulation of the studied reaction systems and produced data that qualitatively matched the experiments.

Keywords

suhi reforming metana;delci nikelj-cerijev(IV) oksid;lattice Boltzmanova metoda;večnivojsko modeliranje;dry reforming of methane;nickel-cerium(IV) oxide rods;lattice Boltzmann method;multiscale modeling;

Data

Language:	English
Year of publishing:	2021
Typology:	1.01 - Original Scientific Article
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
UDC:	66.092.81
COBISS:	34724867
ISSN:	1385-8947
Views:	371
Downloads:	111
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	suhi reforming metana;nikelj-cerijev(IV) oksid;delci;lattice Boltzmanova metoda;večnivojsko modeliranje;
Type (COBISS):	Article
Pages:	str. 1-13
Issue:	ǂVol. ǂ413
Chronology:	1 Jun. 2021
DOI:	10.1016/j.cej.2020.127498
ID:	12907172