Abstract: The XDR technique was used for studying a series of high‐loaded (90%) nickel catalysts with silica as a textural promoter. These were catalysts for direct cracking of methane at 550°C. A relation between the initial average size of active catalyst particles, carbon yield and average methane conversion was demonstrated. Genesis of these catalysts was studied including oxide precursors, reduced catalysts prior to the reaction, as well as catalysts upon their contacting the reaction medium for various periods of time from 15 min to 2 h. The active catalyst particles were shown to merge or disperse at the outset of the reaction depending on their initial size. Anyway, close average sizes ranging from 30 to 40 nm were observed by the end of the first reaction hour for all the catalytic systems providing the carbon yield of 300–385 g/g Ni. The catalytic system was shown to self‐organize in the course of direct methane cracking, i.e., the catalyst particles transform in response to the reaction conditions. If the size of nickel particles cannot vary, these catalysts are inefficient for the given process.

Cite: Ermakova M.A. , Ermakov D.Y. , Plyasova L.M. , Kuvshinov G.G.
XRD Studies of Evolution of Catalytic Nickel Nanoparticles During Synthesis of Filamentous Carbon from Methane
Catalysis Letters. 1999. V.62. N2-4. P.93-97. DOI: 10.1023/A:1019079929435 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	Jun 9, 1999
Accepted:	Sep 2, 1999
Published print:	Oct 1, 1999

Identifiers:

Web of science:	WOS:000083512000002
Scopus:	2-s2.0-0033232574
Elibrary:	13313583
Chemical Abstracts:	1999:765442
Chemical Abstracts (print):	131:342559
OpenAlex:	W247179065

Citing:

DB	Citing
Web of science	50
Scopus	53
Elibrary	56
OpenAlex	48

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