The effect of PdZn particle size on reverse-water-gas-shift reaction

Journal Article · Sat May 15 04:00:00 EDT 2010 · Applied Catalysis. A, General, 379(1-2):3-6

DOI:https://doi.org/10.1016/j.apcata.2010.02.008· OSTI ID:983421

Lebarbier, Vanessa MC; Dagle, Robert A; Datye, A K; Wang, Yong

The effect of PdZn particle size on the catalytic activity of Pd/ZnO catalysts for the reverse-water-gas-shift (RWGS) reaction was studied. The PdZn particle size was varied by adjusting Pd loading and reducing the catalysts at different temperatures. XRD and IR spectroscopy characterization confirmed the absence of metallic Pd on the catalyst surface. Consequently, the effect of PdZn alloy particle size on the RWGS reaction can be unambiguously studied without the complication of reactions catalyzed by metallic Pd. The results indicated that the turnover frequency increases as the PdZn crystallite size decreases. Interestingly, this structure relationship between PdZn particle size and RWGS activity is consistent with that previously observed for the steam reforming of methanol, i.e., higher CO selectivity on smaller PdZn particles. Thus, RWGS has been identified as a likely potential reaction pathway to undesired CO formation in methanol steam reforming on Pd/ZnO catalysts for hydrogen production.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 983421
• Report Number(s): PNNL-SA-68800; 24691; KC0302010
• Journal Information: Applied Catalysis. A, General, 379(1-2):3-6, Journal Name: Applied Catalysis. A, General, 379(1-2):3-6 Journal Issue: 1-2 Vol. 379; ISSN 0926-860X
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
10 SYNTHETIC FUELS
ALLOYS
CATALYSTS
CO formation
Environmental Molecular Sciences Laboratory
HYDROGEN PRODUCTION
METHANOL
PARTICLE SIZE
PdZn alloy
PdZn catalyst
PdZn particle size
SPECTROSCOPY
STEAM
X-RAY DIFFRACTION
reverse water gas shift