Characteristics on NOx adsorption and intermediates of LNT catalyst

Ko, Seung-Jae; Oh, Kwang Chul; Seo, Choong-Kil; Lee, C. B.

doi:10.1007/s12239-014-0036-4

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…Meanwhile, the pyrolysis coke catalyst whose volatile is 11.5% contains more metal ions and organic matter, so the denitration efficiency is higher than that when the pyrolysis coke catalyst volatile is 8% after 15 min. So it can be concluded that the denitration efficiency of the pyrolysis coke catalyst will be better when the volatile is controlled in the certain range [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

Study on the NO removal efficiency of the lignite pyrolysis coke catalyst by selective catalytic oxidation method

Zhang

Xiangling

et al. 2017

PLoS ONE

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Selective catalytic oxidation (SCO) method is commonly used in wet denitration technology; NO after the catalytic oxidation can be removed with SO2 together by wet method. Among the SCO denitration catalysts, pyrolysis coke is favored by the advantages of low cost and high catalytic activity. In this paper, SCO method combined with pyrolysis coke catalyst was used to remove NO from flue gas. The effects of different SCO operating conditions and different pyrolysis coke catalyst made under different process conditions were studied. Besides, the specific surface area of the catalyst and functional groups were analyzed with surface area analyzer and Beohm titration. The results are: (1) The optimum operating conditions of SCO is as follows: the reaction temperature is 150°C and the oxygen content is 6%. (2) The optimum pyrolysis coke catalyst preparation processes are as follows: the pyrolysis final temperature is 750°C, and the heating rate is 44°C / min. (3) The characterization analysis can be obtained: In the denitration reaction, the basic functional groups and the phenolic hydroxyl groups of the catalyst play a major role while the specific surface area not.

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Section: Resultsmentioning

confidence: 99%

Study on the NO removal efficiency of the lignite pyrolysis coke catalyst by selective catalytic oxidation method

Zhang

Xiangling

et al. 2017

PLoS ONE

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“…13,14,27,28 The upstream NO x concentration is solely dependent on the EGR rate control strategy of the diesel engine, whereas the downstream NO x signal reflects the de-NO x control strategies of the aftertreatment systems combined with the EGR and LNT catalyst. 13,14,27,29,30 The intake air volume and EGR quantity were also adjusted to boost the exothermic energy and improve the combustion stability. [31][32][33] Figure 8 and Table 12 show the results of the FE after performing the tests under different modes (FTP-75 and HWFET).…”

Section: Correlation Analysis Of the Fe On The Rl Variation From The Gdi Vehicle By One-way Anova (Ftp-75 And Hwfet)mentioning

confidence: 99%

Correlation analysis of road load fuel economy variations by energy difference for gasoline direct injection and diesel-powered vehicles

Son

Kim

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Test flexibilities, such as the tire pressure, adjustment of brakes, vehicle preconditioning, test mass, and running-in period, are multiple factors that can confound vehicle emissions and fuel economy tests. The road load force is the most influential flexibility factor for a type-approval vehicle certification test. Because of these various factors, it was revealed that there was a substantial difference between the type-approval emissions and those from a real-driving emissions test. In this study, the test cycle road load energy using the road load coefficients determined by the TA coast-down procedure was the base condition. After calculating the test cycle road load power, the constant term of the road load coefficient was adjusted by the energy loss. The tolerance of the road load in domestic regulation is 15%, so the constant term of the road load coefficient was increased by 5% in the cycle road load energy loss. Then, the road load power and tractive power were calculated from the force and vehicle speed. The vehicle fuel efficiency, under the road load variation conditions, was determined for modern 2.4 L gasoline direct injection and lean NOx trap-equipped diesel vehicles on a chassis dynamometer. To assess the impact of different road load values on the FE and carbon dioxide emissions, the test cycle was performed over the combined modes of the federal test procedure-75 and the highway fuel economy test. To investigate the road load variations of the vehicle fuel economy in correlation with the energy difference, the statistical approach of the one-way analysis of variance was applied. The results showed that the variations of the road load energy of the tested cycle were closely related in a trade-off relationship with the vehicle fuel economy.

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“…In the case of V 2 O 5 -WO 3 -TiO 2 , N 2 O is generated at high temperatures and through the standard and fast reactions. For this reason, NH 3 and NOx are stored as NH 4 NO 3 at the acid site, N 2 O generation results from increases N 2 O selectivity, and generally, N 2 O can be produced at or near stoichiometric equivalence to the NO 2 entering the SCR catalyst. Eq.…”

Section: De-nox Performance Of Scr Catalystmentioning

confidence: 99%

“…Taking diesel combustion characteristics into consideration, NOx emitted from diesel engines is mostly produced in the localized high-temperature reaction zone, and PM (particulate matter) in diffusion combustion zones. Recent research into NOx reduction includes studies on LNT (lean NOx trap) [1][2][3][4], SCR (selective catalytic reduction) [5][6][7][8][9][10], and combined system of LNT and SCR for after-treatment systems.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical characteristics according to aging of Fe-zeolite and V2O5–WO3–TiO2 SCR for diesel engines

Seo

Choi

2015

Journal of Industrial and Engineering Chemistry

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Characteristics on NOx adsorption and intermediates of LNT catalyst

Cited by 13 publications

References 11 publications

Study on the NO removal efficiency of the lignite pyrolysis coke catalyst by selective catalytic oxidation method

Study on the NO removal efficiency of the lignite pyrolysis coke catalyst by selective catalytic oxidation method

Correlation analysis of road load fuel economy variations by energy difference for gasoline direct injection and diesel-powered vehicles

Physicochemical characteristics according to aging of Fe-zeolite and V2O5–WO3–TiO2 SCR for diesel engines

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