Simulation of NO[sub x] scrubbing by ceric solutions: Oxidation of nitrous acid by Ce(IV) species in acidic solutions

Journal Article · Mon Jan 31 23:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00026a003· OSTI ID:7117532

Aurousseau, M; Lapicque, F; Storck, A ^[1]

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1. CNRS-ENSIC-INPL, Nancy (France). Lab. des Sciences du Genie Chimique

The oxidation of nitrogen oxides in ceric solution was accomplished by the liquid-phase oxidation of nitrous acid. Kinetic measurements in a discontinuous reactor were performed using two analytical techniques. In particular, amperometric titration of Ce(IV) allowed on-line measurement of CE(IV) concentration. The oxidation was shown to be a first-order process with respect to both Ce(IV) and nitrous acid, in the range 0.1--0.5 mol/m[sup 3]. The concentration of sulfuric acid exerted a strong influence on the rate constant k in the range 500--9500 mol/m[sup 3]. The presence of nitric acid resulted in additional reduction in k, especially for concentrated sulfuric solutions. The strong variation of the rate constant with the concentration of both acids is likely due to changes in the chemical states of nitrous acid in the solution. A factorial design method yielded the dependence of acid concentrations on the rate constant k = 0.0061 + (144/[H[sub 2]SO[sub 4]]) - [(3.03 [times] 10[sup [minus]6])[HNO[sub 3]]] + [(1.08 [times] 10[sup 4])/[H[sub 2]SO[sub 4]][sup 2]] - [0.0041([HNO[sub 3]]/[H[sub 2]/SO[sub 4]])] m[sup 3]/mol.s at 25 C, for the concentration ranges at H[sub 2]SO[sub 4], 500--5000 mol/m[sup 3], 0--4000 mol/m[sup 3].

• OSTI ID: 7117532
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:2; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

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CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONCENTRATION RATIO
DATA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS ACID
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
REDUCTION
SCRUBBING