Catalytic oxidation of HCN over a 0.5% Pt/Al2O3 catalyst

Journal Article · Mon Mar 27 04:00:00 EST 2006 · Applied Catalysis. B, Environmental, 65(2006):282-290

DOI:https://doi.org/10.1016/j.apcatb.2006.02.009· OSTI ID:883676

Zhao, Haibo; Tonkyn, Russell G; Barlow, Stephan E; Koel, Bruce E; Peden, Charles HF

The adsorption of HCN on, its catalytic oxidation with 6% O2 over 0.5% Pt/Al2O3, and the subsequent oxidation of strongly bound chemisorbed species upon heating were investigated. The observed N-containing products were N2O, NO and NO2, and some residual adsorbed N-containing species were oxidized to NO and NO2 during subsequent temperature programmed oxidation. Because N-atom balance could not be obtained after accounting for the quantities of each of these product species, we propose that N2 and was formed. Both the HCN conversion and the selectivity towards different N-containing products depend strongly on the reaction temperature and the composition of the reactant gas mixture. In particular, total HCN conversion reaches 95% above 250 C. Furthermore, the temperature of maximum HCN conversion to N2O is located between 200 and 250 C, while raising the reaction temperature increases the proportion of NOx in the products. The co-feeding of H2O and C3H6 had little, if any effect on the total HCN conversion, but C3H6 addition did increase the conversion to NO and decrease the conversion to NO2, perhaps due to the competing presence of adsorbed fragments of reductive C3H6. Evidence is also presented that introduction of NO and NO2 into the reactant gas mixture resulted in additional reaction pathways between these NOx species and HCN that provide for lean-NOx reduction coincident with HCN oxidation.

• 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: 883676
• Report Number(s): PNNL-SA-47073; 3589; 6694; VT0401000
• Journal Information: Applied Catalysis. B, Environmental, 65(2006):282-290, Journal Name: Applied Catalysis. B, Environmental, 65(2006):282-290
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ADSORPTION
ALUMINIUM OXIDES
C3H6
CATALYSTS
CATALYTIC EFFECTS
ETHANE
Environmental Molecular Sciences Laboratory
HCN
HYDROCYANIC ACID
N2O
NITRIC OXIDE
NITROGEN DIOXIDE
NITROUS OXIDE
NO
NO2
NOx
OXIDATION
PLATINUM
desorption
oxidation
supported Pt catalyst