Sulfur-Resistant Cu0.7Ni0.3Fe2O4 Catalyst for Removing NO from Diesel Exhausts

Liang, Meisheng; Chen, Yi‐Chen; Li, Long; Bo, Xin; Lai, Zhuojun

doi:10.1007/s10562-020-03154-7

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…Because of the increase in the acidity of the catalyst surface, NH 3 molecules are easily adsorbed on the surface of the acidic catalysts. In addition, the increase in acidity shortens the residence time of NO molecules, accelerating the catalytic reaction, thus improving the NO oxidation ability …”

Section: Resultsmentioning

confidence: 99%

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Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Yang

Wang

et al. 2021

ACS Catal.

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We present a facile selective dissolution method for the surface modification of SmMn2O5 mullite (SMO) to increase the exposed sites for NO oxidation on the premise of excellent thermal stability. Surface Sm cations are partially removed during the treatment (SMO-H), leading to the exposure of B-site cations with higher electronegativity and oxygen vacancies. Under laboratory-simulated diesel combustion conditions, the SMO-H exhibits higher NO oxidation activity than the SMO and is comparable to that of the Pt/Al catalyst under a gas hourly space velocity (GHSV) of 120 000 mL g–1 h–1. In addition, the SMO-H possesses good thermal and steam stability during a 50 h test at 300 °C. X-ray absorption spectroscopy (XAS) and electron paramagnetic resonance (EPR) spectroscopy results reveal that the SMO-H presents more Mn4+O6 octahedral groups and oxygen vacancies than the SMO. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), and density functional theory (DFT) calculations show that the valence of surface Mn decreased after NO capture up to 300 °C and fulfilled the adsorption procedure as nitrite and/or nitrate species when O2 is involved in the flue gas. The results indicate that Mn-terminated surface rather than Sm-terminated one is the major adsorption site for NO.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the increase in acidity shortens the residence time of NO molecules, accelerating the catalytic reaction, thus improving the NO oxidation ability. 44 NO-TPD (Figure 6d) was used to investigate the NO adsorption/desorption species on the surfaces. Two desorption peaks at 170 and 345 °C were observed.…”

Section: Resultsmentioning

confidence: 99%

Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Yang

Wang

et al. 2021

ACS Catal.

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“…Because of the relatively high sulphur content in Chinese diesel, the catalyst in the NH3-SCR process for eliminating NO from diesel exhaust is susceptible to poisoning. By employing citric acid as a complexing agent, spinel-type Cu1xNixFe2O4 (x = 0-0.5) catalysts with different Ni concentrations were produced using the sol-gel technique by Liang et.al (Liang, 2020) to counter this. In a uidized bed reactor, the catalytic activities for NO removal in sulfur-free and sulfur-containing (SO2, 0.035 percent, volume fraction) air were examined.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation with Optimal Prediction of Emission in Diesel Engine Using Combined SCR-NSR Catalyzer

Durairaj

Subramanian

Duraiswami

2022

Preprint

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An expanding requirement for clean air motivates the vehicle makers to contribute a lot of time and cash to reduce toxic emissions. The utilization of catalytic converters is one of the well-known strategies to clean the exhaust. The catalytic converters oxidize the destructive carbon monoxide, hydrocarbon emissions into harmless CO2 and water vapor. In this experiment, the essential objective is to develop a catalytic converter with combined methods like selective catalytic reduction, NOx storage and reduction (SCR-NSR) procedure and test its effectiveness towards the NOx reduction from the exhaust of diesel engine. The combination of the two systems is proposed in this experimentation for building up an effective catalytic converter and distinguishing the optimal emission processes. The fabricated SCR-NSR catalytic converter fitted to the exhaust system and the emission rates are estimated with the help of a gas analyzer. The testing is done by utilizing diesel as fuel in the Kirloskar TV1 engine with NSR, Non-filter and combined NSR-SCR system. The investigation is experiencing for 20 trials with different emission parameters is analyzed. For improving the discharge level in the engine, the test data are predicted with the proposed numerical model and tested in Mat Lab software. The invasive weed optimization and particle swarm optimization together with a recurrent neural network are utilized for the prediction and optimization process and parameters like compression ratio, input power, and load are utilized as input to the experimentation. In the 20 trial, a low level of discharge is attained in the 17th trial. Subsequently, the prediction goes for the 20 sets individually and compared with 17th set and the experimental results demonstrates that the discharge rates acquired for consolidated NSR-SCR observed to be 0.01% of CO, 3% of HC, 0.1% of CO2, 20.74% of O2, and 68 ppm of NOx. At the point when compared to predicted outcomes demonstrates the ideal level of 0.001% of CO, 0.5% of HC, 0% of CO2, 21.76% of O2, and 60.6ppm of NOx respectively. The proposed invasive weed optimization and particle swarm optimization obviously reduce the emission rates of diesel engine than the other comparative methods.

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The Properties and SCR de‐NO_x Application of Supported V₂O₅/TiO₂ Catalysts with Different Polymerization State of VO_x Species Controlled by the pH Value of Their Precursors

et al. 2020

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NO x is the main pollutant in the air, which causes many harmful effects on society. The V 2 O 5 /TiO 2 catalysts are very important to reduce the NO x from the heat engine plants and vehicle exhausts. However, various reasons will affect the performance of the catalysts. In this paper, the polymerization state of surface VO x of supported V 2 O 5 /TiO 2 catalysts was controlled by changing the pH value of the impregnation precursor solutions, and the redox and acidity properties of the catalysts can be adjusted consequently. The Raman spectroscopy, 51 V magicangle spinning nuclear magnetic resonance (MAS NMR), H 2temperature-programmed reduction (H 2-TPR), NH 3-temperature-programmed desorption (NH 3-TPD), NH 3-temperature-programmed oxidation (TPO) and 15 NH 3-NO-O 2-temperature-programmed surface reaction (TPSR) were mainly used for the characterization and properties tests of the samples. Although all catalysts in this work had similar surface morphology and the same vanadium loading, the catalyst oxidability decreased while acidity increased with the increasing of VO x polymerization, which causes the NO conversion increases with the increasing of VO x polymerization below 300°C in selective catalytic reduction (SCR) de-NO x reaction. This work will promote the advance in catalysis and anti-pollution fields for human and nature.

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Sulfur-Resistant Cu0.7Ni0.3Fe2O4 Catalyst for Removing NO from Diesel Exhausts

Cited by 4 publications

References 39 publications

Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Experimental Investigation with Optimal Prediction of Emission in Diesel Engine Using Combined SCR-NSR Catalyzer

The Properties and SCR de‐NO_x Application of Supported V₂O₅/TiO₂ Catalysts with Different Polymerization State of VO_x Species Controlled by the pH Value of Their Precursors

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Sulfur-Resistant Cu0.7Ni0.3Fe2O4 Catalyst for Removing NO from Diesel Exhausts

Cited by 4 publications

References 39 publications

Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Surface Reconstruction of a Mullite-Type Catalyst via Selective Dissolution for NO Oxidation

Experimental Investigation with Optimal Prediction of Emission in Diesel Engine Using Combined SCR-NSR Catalyzer

The Properties and SCR de‐NOx Application of Supported V2O5/TiO2 Catalysts with Different Polymerization State of VOx Species Controlled by the pH Value of Their Precursors

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The Properties and SCR de‐NO_x Application of Supported V₂O₅/TiO₂ Catalysts with Different Polymerization State of VO_x Species Controlled by the pH Value of Their Precursors