Effect of Nickel Oxide Dispersity on Carbon Capacity of Nickel Catalysts for Low-Temperature Methane Cracking
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Conference |
Monolith honeycomb supports and catalysts. Post conference seminar of Memorial G.K. Boreskov conference "Catalysis on the Eve of the XXI Century. Science and Engineering"
12-15 Jul 1997
,
Novosibirsk
|
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584
, E-ISSN: 1608-3210
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| Output data |
Year: 1998,
Volume: 39,
Number: 5,
Pages: 728-731
Pages count
: 4
|
| Authors |
Ermakova M.A.
1
,
Ermakov D.Y.
1
,
Kuvshinov G.G.
1
,
Plyasova L.M.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
|
The effect of nickel oxide dispersity on the carbon formation capacity of high-percentage nickel catalysts for methane cracking was studied using 96% Ni-4% SiO2 as a model system. A new procedure for catalyst preparation was proposed. The procedure provides the nickel oxide dispersity independence of its concentration. It is based on the incorporation of silicon oxide in nickel oxide pores by the impregnation of the latter with an alcohol solution of hydrolyzed tetraethoxysilane. The necessary dispersity of NiO was achieved by its preliminary calcination at a certain temperature over a 300-900 degrees C range. Using the catalysts with different specific surface areas (from 200 to 0.7 m(2)/g, which correspond to the average sizes of NiO particles from 3 to >100 nm), we showed that their carbon capacity correlates with the specific surface area of nickel oxide and, hence, with the average size of NiO particles. The carbon capacity has a maximum (300 g C/g Ni) in the region of 50 m(2)/g (d(av) NiO similar to 19 nm). The results obtained point to the possibility of the formation of catalytic systems with the optimum size distribution of active particles.