The Formation and Hydrolysis of Isocyanic Acid during the Reaction of NO, CO, and H2 Mixtures on Supported Platinum, Palladium, and Rhodium

Chambers, Dean C.; Angove, Dennys E.; Cant, Noel W.

doi:10.1006/jcat.2001.3359

Cited by 58 publications

(60 citation statements)

References 54 publications

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“…Silva and Schmal [14] show that the -NCO species is an important intermediate in the NO reduction by CO while Granger et al [6] suggest that the formation of N 2 directly from NO dissociation might be the important step for NO reduction. The literature experimental results show that N 2 O is formed as an undesired product during the NO-CO reaction on Pt group catalysts [4]. Some articles indicate that N 2 O is an intermediate in the formation of N 2 [5,6].…”

Section: Elementary Reaction Mechanism and Reactor Modelmentioning

confidence: 99%

“…The system of equations is solved using MATLAB in order to obtain the outlet concentrations of various species as a function of reactor temperature, on a Pt (1 1 1) catalyst. Simulation results are compared with the experiments carried out by Chambers et al [4] for the NO-CO reaction on a Pt/SiO 2 catalyst which is briefly described below.…”

Section: Pbr/cstr Modelmentioning

confidence: 99%

“…Chambers et al [4] carried out experiments on a Pt based catalyst for NO x reduction using carbon monoxide as the reducing agent. The feed used in the experiments contained 3000 ppm NO and 3400 ppm CO.…”

Section: Pbr/cstr Modelmentioning

confidence: 99%

“…Selective catalytic reduction using hydrocarbons (HC-SCR) is found to be effective for NO x control [1][2][3]. The reactions between CO and NO are important in HC-SCR and CO is found to be a good reducing agent for NO x [4][5][6][7]. The use of CO as a reducing agent has advantages for practical application because of its presence in significant amounts in automobile exhausts.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Detailed surface reaction mechanism for reduction of NO by CO

Mantri¹,

Aghalayam²

2007

Catalysis Today

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Section: Elementary Reaction Mechanism and Reactor Modelmentioning

confidence: 99%

Section: Pbr/cstr Modelmentioning

confidence: 99%

Section: Pbr/cstr Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Detailed surface reaction mechanism for reduction of NO by CO

Mantri¹,

Aghalayam²

2007

Catalysis Today

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“…It was suggested that although NH 3 formation takes place through the hydrolysis of -NCO in both cases, H 2 adsorption on Pd particles may further weaken the N-O bond on Pd sites and thus enhance the NO dissociation and subsequent -NCO formation process. It should be also mentioned that in the presence of H 2 , NH 3 formation can also readily occur via an alternative pathway which is the hydrogenation of atomic N. In a related study, Cant and coworkers [131] [132]demonstrated the formation of gas phase HNCO in the CO + NO + H 2 reaction on high surface area Pd/SiO 2 and Pt/SiO 2 catalysts. This interesting finding supported the possibility that hydrolysis of -NCO to form NH 3 can take place via an HNCO intermediate as originally proposed by Unland et al [128].…”

Section: Co + No Reaction On Pd(111) At Elevated Pressures and The Fomentioning

confidence: 99%

Understanding the Catalytic Conversion of Automobile Exhaust Emissions Using Model Catalysts: CO + NO Reaction on Pd(111)

Özensoy

Heß

Goodman

2004

Topics in Catalysis

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The CO + NO reaction is one of the profoundly important reactions that take place on Pd-based industrial three-way catalysts (TWC). In this review, we discuss results from polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) and conventional IRAS experiments on CO adsorption, NO adsorption and the CO + NO reaction on a Pd(111) model catalyst surface within a wide range of pressures (10 -6 -450 Torr) and temperatures (80 -650 K). It will be shown that these studies allow for a detailed understanding of the adsorption behavior of these species as well as the nature of the products that are formed during their reaction under realistic catalytic conditions. CO adsorption experiments on Pd(111) at elevated pressures reveal that CO overlayers exhibit similar adsorption structures as found for ultrahigh vacuum (UHV) conditions. On the other hand, in the case of the CO + NO reaction on Pd(111), the pressure dependent formation of isocyanate was observed. The importance of this observation and its effects on the improvement of the catalytic NOx abatement is discussed. The kinetics of the CO + NO reaction on Pd(111) were also investigated and the factors affecting its selectivity are addressed.

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Detailed kinetic modelling of automotive exhaust NO_x reduction over rhodium catalyst

Xie

et al. 2014

Can J Chem Eng

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The reduction of NO with CO and H2 as the reductants was investigated on the rhodium‐based catalyst over a temperature range of 150–400 °C. Micro‐kinetic modelling method was utilized to compare the activities of CO and H2. Quasi‐elementary mechanisms of NO‐CO and NO‐H2 consisting of 11 and 25 steps, respectively, were proposed. The reaction steps and kinetic parameters were derived from literature and some parameters were optimized to fit the experimental data. Furthermore, to verify the validity range of the developed mechanism, the reaction intermediate N2O reduction by CO and by H2 over Rh were investigated. Over a wide range of reaction conditions, the detailed mechanism predicted experimental results quite well for both NO and N2O conversions with CO and/or H2 as reductant. The phenomenon that NO‐CO and NO‐H2 reactions commenced at similar temperature can be interpreted by the hindered H2 dissociative adsorption steps by extensive NO adsorption. Reaction profiles such as fractional coverages, reaction pathway and sensitivity analysis provided valuable insight into the reaction systems. N2O plays a crucial role in N2 formation for both NO‐CO and NO‐H2 reaction systems. The routes involving N2O formation and decomposition were identified as the dominant pathway in N2 formation at low temperatures.

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The Formation and Hydrolysis of Isocyanic Acid during the Reaction of NO, CO, and H2 Mixtures on Supported Platinum, Palladium, and Rhodium

Cited by 58 publications

References 54 publications

Detailed surface reaction mechanism for reduction of NO by CO

Detailed surface reaction mechanism for reduction of NO by CO

Understanding the Catalytic Conversion of Automobile Exhaust Emissions Using Model Catalysts: CO + NO Reaction on Pd(111)

Detailed kinetic modelling of automotive exhaust NO_x reduction over rhodium catalyst

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The Formation and Hydrolysis of Isocyanic Acid during the Reaction of NO, CO, and H2 Mixtures on Supported Platinum, Palladium, and Rhodium

Cited by 58 publications

References 54 publications

Detailed surface reaction mechanism for reduction of NO by CO

Detailed surface reaction mechanism for reduction of NO by CO

Understanding the Catalytic Conversion of Automobile Exhaust Emissions Using Model Catalysts: CO + NO Reaction on Pd(111)

Detailed kinetic modelling of automotive exhaust NOx reduction over rhodium catalyst

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Detailed kinetic modelling of automotive exhaust NO_x reduction over rhodium catalyst