Performance and Mechanistic Aspects of Ag/MgO/$${\varvec{\gamma}}$$-Al2O3 as a Passive NOx Adsorber

Khatri, Prateek; Bhatia, Divesh

doi:10.1007/s10562-021-03565-0

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…The detailed characterization results of this catalyst have been reported previously, and are included here in brief. 19,20 The BET surface area and pore volume of the catalyst were measured to be 228 m 2 /g and 0.54 cm 3 /g, respectively. Based on TEM measurements, a majority of the Ag particles were found to lie in the range of 5-14 nm.…”

Section: Characterization Resultsmentioning

confidence: 99%

“…The catalyst Ag/MgO/γ‐Al 2 O 3 was synthesized by employing incipient wetness impregnation technique 19,20 . PURAL MG05 (MgO:Al 2 O 3 = 05:95) obtained from SASOL was calcined at 650°C for 3 h to prepare the support.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the catalyst characterization are reported in our earlier work, and are included here in brief 19,20 . The specific surface area and pore volume of the catalyst were measured using a Micromeritics make 3Flex instrument.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the catalyst characterization are reported in our earlier work, and are included here in brief. 19,20 The specific surface area and pore volume of the catalyst were measured using a Micromeritics make 3Flex instrument. X-ray diffraction analysis was done on a Miniflex 300/600 instrument, whereas transmission electron microscopy (TEM) analysis was done using JEOL JEM-1400 microscope.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Khatri

Bhatia

2022

AIChE Journal

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The effect of H2, H2O, and CO2 on the NOx removal characteristics of a non‐PGM material (Ag/MgO/γ‐Al2O3) is investigated, which is shown to be active for both NOx adsorption and reduction. H2O facilitates NOx adsorption at early times but inhibits it at longer times. The inhibiting effect of CO2 is observed at low temperatures and is proposed to be due to bicarbonates. However, the inhibiting effect of both H2O and CO2 decreases at higher temperatures. The formation of NO2 at low temperatures is attributed to NO oxidation, and the contribution of stored NOx to NO2 formation increases with temperature. H2O inhibits NH3 oxidation at high temperatures as well as NOx reduction by NH3‐SCR at low temperatures. However, the NOx reduction activity is not affected by CO2. H2 significantly promotes the NH3‐SCR reactions, which is attributed to the facilitation of NOx spillover from the reduced Ag sites to the support.

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Section: Characterization Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

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Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Khatri

Bhatia

2022

AIChE Journal

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“…This result is specifically important with reference to selective NO x recirculation. This is because NO 2 could form a significant fraction of NO x released from various adsorbents during the desorption/reduction phase, due to which NO 2 could be a major component of the NO x recycled to the engine intake. − However, since the decomposition of NO 2 to NO occurs during the early stages of the power stroke, NO could be used as the model compound for the design of a SNR system.…”

Section: Resultsmentioning

confidence: 99%

Reaction Pathway Analysis for Investigation of the NO_x Reduction Mechanism during Selective NO_x Recirculation in a Hydrogen Engine

2022

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The injection of nitrogen monoxide (NO) into an internal combustion engine has been shown in the literature to reduce the net generation of nitrogen oxides (NOx). In this work, engine simulations are performed using two different microkinetic models to carry out an analysis of reaction pathways responsible for the net decrease in NOx formation when NO is injected into a hydrogen–fuelled internal combustion engine. The net NOx formed when 5000 ppm NO is injected at the engine intake is found to be 60% lower than the case without any NOx injection. The major reactions contributing to the formation and conversion of NO are obtained for various phases of combustion, and the corresponding reaction pathway diagrams are constructed. During the early phase of combustion with an increasing in-cylinder temperature and pressure, the Zeldovich reactions primarily contribute toward NO formation (60–82% contribution). During this phase, NO is primarily a product for various reactions, and the net rate of production of NO decreases with the external injection of NO. Further, any nitrogen dioxide (NO2) present in the intake mixture gets decomposed to NO owing to the high temperature. Thus, the in-cylinder NOx concentrations at the end of the power stroke are governed by the rate of consumption and formation of NO, irrespective of the NOx speciation at the intake. During the later phase of combustion with a decreasing in-cylinder temperature and pressure, the NOx concentration decreases, and the reactions constituting the Zeldovich mechanism dominate NO consumption, with the reactions involving fuel-NOx interactions playing a secondary role (<14% contribution). A comparison of the net rate of consumption of NO, the rate of formation of N2, the major reactions involved in NO reduction, and their relative contribution shows conclusively that the mechanism of NOx reduction is not impacted by the addition of NO.

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Effects of different EHC on times on gaseous, particulate pollutants and energy consumption of PNA + DOC + SDPF system under low temperature and WHTC conditions

Kang,

Lou,

Zhang

et al. 2024

Applied Energy

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Performance and Mechanistic Aspects of Ag/MgO/$${\varvec{\gamma}}$$-Al2O3 as a Passive NOx Adsorber

Cited by 6 publications

References 29 publications

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Reaction Pathway Analysis for Investigation of the NO_x Reduction Mechanism during Selective NO_x Recirculation in a Hydrogen Engine

Effects of different EHC on times on gaseous, particulate pollutants and energy consumption of PNA + DOC + SDPF system under low temperature and WHTC conditions

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Performance and Mechanistic Aspects of Ag/MgO/$${\varvec{\gamma}}$$-Al2O3 as a Passive NOx Adsorber

Cited by 6 publications

References 29 publications

Effect of H2, H2O, and CO2 on the deNOx characteristics of a combined passive NOx adsorber and NOx reduction catalyst

Effect of H2, H2O, and CO2 on the deNOx characteristics of a combined passive NOx adsorber and NOx reduction catalyst

Reaction Pathway Analysis for Investigation of the NOx Reduction Mechanism during Selective NOx Recirculation in a Hydrogen Engine

Effects of different EHC on times on gaseous, particulate pollutants and energy consumption of PNA + DOC + SDPF system under low temperature and WHTC conditions

Contact Info

Product

Resources

About

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Effect of H₂, H₂O, and CO₂ on the deNO_x characteristics of a combined passive NO_x adsorber and NO_x reduction catalyst

Reaction Pathway Analysis for Investigation of the NO_x Reduction Mechanism during Selective NO_x Recirculation in a Hydrogen Engine