2017
DOI: 10.1021/acscatal.7b02757
|View full text |Cite
|
Sign up to set email alerts
|

Mechanism of Cobalt-Catalyzed CO Hydrogenation: 1. Methanation

Abstract: The mechanism of CO hydrogenation to CH4 at 260 °C on a cobalt catalyst is investigated using steady-state isotopic transient kinetic analysis (SSITKA) and backward and forward chemical transient kinetic analysis (CTKA). The dependence of CHx residence time is determined by 12CO/H2 → 13CO/H2 SSITKA as a function of the CO and H2 partial pressure and shows that the CH4 formation rate is mainly controlled by CHx hydrogenation rather than CO dissociation. Backward CO/H2 → H2 CTKA emphasizes the importance of H co… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

13
72
1

Year Published

2018
2018
2024
2024

Publication Types

Select...
6

Relationship

1
5

Authors

Journals

citations
Cited by 61 publications
(92 citation statements)
references
References 69 publications
13
72
1
Order By: Relevance
“…In literature, two deactivation reasons are most frequently considered -coking and sintering. According to the mechanistic study of Chen et al [18] on a Co/SiO 2 catalyst, the CO methanation proceeds by the direct dissociation of CO to atomic C and O, which is subsequently hydrogenated to CH 4 and H 2 O. Carbon deposition induced by the Boudouard reaction (Equation 4), as frequently reported for similar systems, [19,47,48] is underlined by the significant CO 2 formation.…”
Section: Co Methanationmentioning
confidence: 80%
See 3 more Smart Citations
“…In literature, two deactivation reasons are most frequently considered -coking and sintering. According to the mechanistic study of Chen et al [18] on a Co/SiO 2 catalyst, the CO methanation proceeds by the direct dissociation of CO to atomic C and O, which is subsequently hydrogenated to CH 4 and H 2 O. Carbon deposition induced by the Boudouard reaction (Equation 4), as frequently reported for similar systems, [19,47,48] is underlined by the significant CO 2 formation.…”
Section: Co Methanationmentioning
confidence: 80%
“…We assume a change in the underlying mechanism induced by the presence of both CO and CO 2 , whose identification is still a matter of debate, [18,19] since only little is known for CO x hydrogenation on cobalt as active material thus far beyond Fischer-Tropsch synthesis. For an increasing CO 2 share in the feed, CO 2 is converted to methane at a significant rate, while for smaller CO 2 fractions the CO methanation is the predominant reaction and CO 2 is produced via the WGS.…”
Section: Effect Of Carbon Oxide Mixturesmentioning
confidence: 99%
See 2 more Smart Citations
“…Procedures to determine the residence time and coverages of CO and CH x (intermediates of CH 4 ) are provided in our earlier work. 38 …”
Section: Methodsmentioning
confidence: 99%