Synthesis and decomposition of formate on a Cu/SiO{sub 2} catalyst: Comparison to Cu(111)

Journal Article · Tue Apr 25 04:00:00 EDT 2000 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.2000.2810· OSTI ID:20030523

Yatsu, T; Nishimura, H; Fujitani, T; Nakamura, J

The kinetics of formate synthesis from CO{sub 2} and H{sub 2} and from formate decomposition on Cu/SiO{sub 2} were studied by temperature-programmed decomposition experiments and compared with those reported for Cu(111), Cu(110), and Cu(100) surfaces under similar reaction conditions. The initial rate of the formate synthesis from 380 Torr CO{sub 2}/380 Torr H{sub 2} at 323--353 K over the Cu/SiO{sub 2} catalyst was in good agreement with those on Cu(111) and Cu(110). At 353 K, for example, the initial rate was measured to be 5.3 x 10{sup {minus}4} molecules/site s. The apparent activation energy was determined to be 58.8 kJ/mol, which was also comparable with those obtained for Cu(111) (54.6--56.6 kJ/mol), Cu(110)(59.8 kJ/mol), and Cu(100)(55.6kJ/mol). The decomposition rate of formate was first-order in formate coverage, and the rate constant was 1.13 x 10{sup {minus}4} s{sup {minus}1} at 384 K. The promotional effect of H{sub 2} upon the decomposition of formate was observed on the Cu/SiO{sub 2} catalyst as observed for Cu(111) but not for Cu(110). The decomposition rate of formate on Cu/SiO{sub 2} was promoted by a factor of 6 at an H{sub 2} pressure of 457 Torr.

• Research Organization: Univ. of Tsukuba, Ibaraki (JP)
• OSTI ID: 20030523
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 191; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
10 SYNTHETIC FUELS
ACTIVATION ENERGY
CARBON DIOXIDE
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COPPER
DECOMPOSITION
FORMATES
HYDROGENATION
METHANATION
SYNTHESIS