Mass Transfer Effects in SCR Reactor for NOx Abatement in Diesel Engines

Karadağ, Hazal G.; Bozbağ, Selmi Erim; Şanlı, Deniz; Demir, Onur; Özener, Barkın; Hisar, Gökhan; Erkey, Can

doi:10.1016/b978-0-12-813734-5.00054-8

Cited by 3 publications

(2 citation statements)

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“…Cylindrical cores with a length of 2.2 cm and a diameter of 1.8 cm were used in the runs. The experiments were carried out in a synthetic gas bench described in [60]. In a typical run, the monolith was first wrapped with a ceramic fibre paper and then loaded in a quartz reactor and placed in the isothermal zone of an electric tubular furnace (Thermo Scientific Lindberg Blue M).…”

Section: Laboratory Testsmentioning

confidence: 99%

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

et al. 2020

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A unified transient kinetic model which can predict the adsorption, desorption and oxidation kinetics of NH3 over hydrothermally aged Cu-chabazite was developed. The model takes into account the variation of fractional coverages of NH3 storage sites due to hydrothermal aging. In order to determine the fractional coverage of these sites, the catalyst was aged for various times at a certain temperature followed by NH3 adsorption, desorption and temperature-programmed desorption (TPD) experiments. TPD profiles were deconvoluted mainly into three peaks with centres at 317, 456 and 526 °C, respectively. Hydrothermal aging resulted in the progressive increase in the intensity of the peak at 317 °C and decrease in the intensity of the peaks at 456 and 526 °C, along with decreased NH3 oxidation at high temperatures. A model for hydrothermal aging kinetics of the fractional coverage of storage sites was developed using three reactions with appropriate rate expressions with parameters regressed from experimental data. The model was then incorporated into a multi-site kinetic model for the degreened Cu-Chabazite by the addition of aging reactions on each storage site. The effects of both aging time and temperature on the kinetics NH3 adsorption, desorption and oxidation were successfully predicted in the 155-540 °C range. This study is the first step towards the development of a hydrothermal aging-unified kinetic model of NH3-Selective Catalytic Reduction over Cu-chabazite.

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Section: Laboratory Testsmentioning

confidence: 99%

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

et al. 2020

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“…Scholars have studied the influence of mass transfer limitation on SCR reactions, and some of them have reported the existence of mass transfer limitation. Karada g et al have investigated mass transfer limitations in a monolith reactor for selective catalytic reduction (SCR) of NO x with a commercial copper chabazite (CHA) catalyst, wherein the results show that the mass transfer limitation is important between 210 and 380 C. [34] According to Hu et al, [35] the SCR reaction rate on the Cu/SAPO-34 powder catalyst is subject to kinetic control. According to Joshi et al, [36] the degree of effect of mass transfer on the SCR reaction varies with temperature over the Cu-SSZ-13 catalyst.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analyses of NH₃‐SCR reaction‐mass transfer over Cu‐ZSM‐5

Zhong

Zuo

et al. 2022

Can J Chem Eng

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NH3‐selective catalytic reduction (NH3‐SCR) is a very effective technical means to control NOx emissions from diesel engines, and Zeolite Selony Mobil No. 5 (SiO2/Al2O3 ratio 53:1) ion exchanged with Cu (Cu‐ZSM‐5) provides support for the high performance of NH3‐SCR within a wide temperature window under diesel engine operating conditions. The mechanism of the NH3‐SCR reaction based on Cu‐ZSM‐5 is established. Resistance analysis, effective factor analysis, and characteristic time analysis are used to analyze the influence of external mass transfer limitation and washcoat diffusion limitation on NH3‐SCR reaction and the transition between the washcoat diffusion control regime, the external mass transfer control regime, and the kinetic control regime of the NH3‐SCR over Cu‐ZSM‐5. It provides the basis for the optimization of the catalyst structure and the support for the improvement of NH3‐SCR performance.

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Assessment of the Single-Site Kinetic Model for NH3-SCR on Cu-Chabazite for the Prediction of NOx Emissions in Dynamometer Tests

Bozbağ

Şimşek

Demir

et al. 2019

Emiss. Control Sci. Technol.

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Mass Transfer Effects in SCR Reactor for NOx Abatement in Diesel Engines

Cited by 3 publications

References 50 publications

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

Theoretical analyses of NH₃‐SCR reaction‐mass transfer over Cu‐ZSM‐5

Assessment of the Single-Site Kinetic Model for NH3-SCR on Cu-Chabazite for the Prediction of NOx Emissions in Dynamometer Tests

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Mass Transfer Effects in SCR Reactor for NOx Abatement in Diesel Engines

Cited by 3 publications

References 50 publications

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

An Aging Model of NH3 Storage Sites for Predicting Kinetics of NH3 Adsorption, Desorption and Oxidation over Hydrothermally Aged Cu-Chabazite

Theoretical analyses of NH3‐SCR reaction‐mass transfer over Cu‐ZSM‐5

Assessment of the Single-Site Kinetic Model for NH3-SCR on Cu-Chabazite for the Prediction of NOx Emissions in Dynamometer Tests

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Theoretical analyses of NH₃‐SCR reaction‐mass transfer over Cu‐ZSM‐5