Performance of Cu-ZSM-5 in a Coupled Monolith NSR-SCR System for NOx Removal in Lean-Burn Engine Exhaust

De‐La‐Torre, Unai; Pereda‐Ayo, Beñat; González‐Marcos, José A.; Gutiérrez-Ortiz, M.A.; González‐Velasco, Juan R.

doi:10.1007/s11244-015-0442-5

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…Currently, the initial two techniques can effectively decrease the overall volume of nitrogen oxides, yet meeting the rigorous emission norms proves to be a challenge. The post-combustion control technology has emerged as the cornerstone for complying with emission standards [ 16 , 17 , 18 , 19 , 20 ]. Currently, the most feasible methods for reducing NO x emissions primarily involve selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR).…”

Section: Introductionmentioning

confidence: 99%

Dy-Modified Mn/TiO2 Catalyst Used for the Selective Catalytic Reduction of NO in Ammonia at Low Temperatures

Xu,

Wang,

et al. 2024

Molecules

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A novel Mn/TiO2 catalyst, prepared through modification with the rare-earth metal Dy, has been employed for low-temperature selective catalytic reduction (SCR) denitrification. Anatase TiO2, with its large specific surface area, serves as the carrier. The active component MnOx on the TiO2 carrier is modified using Dy. DyxMn/TiO2, prepared via the impregnation method, exhibited remarkable catalytic performance in the SCR of NO with NH3 as the reducing agent at low temperatures. Experiments and characterization revealed that the introduction of a suitable amount of the rare-earth metal Dy can effectively enhance the catalyst’s specific surface area and the gas–solid contact area in catalytic reactions. It also significantly increases the concentration of Mn4+, chemisorbed oxygen, and weak acid sites on the catalyst surface. This leads to a notable improvement in the reduction performance of the DyMn/TiO2 catalyst, ultimately contributing to the improvement of the NH3-SCR denitrification performance at low temperatures. At 100 °C and a space velocity of 24,000 h−1, the Dy0.1Mn/TiO2 catalyst can achieve a 98% conversion rate of NOx. Furthermore, its active temperature point decreases by 60 °C after the modification, highlighting exceptional catalytic efficacy at low temperatures. By doubling the space velocity, the NOx conversion rate of the catalyst can still reach 96% at 130 °C, indicating significant operational flexibility. The selectivity of N2 remained stable at over 95% before reaching 240 °C.

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Section: Introductionmentioning

confidence: 99%

Dy-Modified Mn/TiO2 Catalyst Used for the Selective Catalytic Reduction of NO in Ammonia at Low Temperatures

Xu,

Wang,

et al. 2024

Molecules

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A four-way catalytic system for control of emissions from diesel engine

Trivedi

Прасад

2018

Sādhanā

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The pollution caused by diesel-fuelled vehicles has become a subject of global concern. Presently, various separate technologies such as diesel oxidation catalyst, diesel particulate filter, selective catalytic reduction and ammonia selective catalytic reduction are used to control these pollutants. The four-way catalytic (FWC) system integrates all the separate control systems into a single compact unit. FWC technique using a combination of oxidation-reduction catalysts under various strategies has been investigated to simultaneously remove CO, HC, PM and NOx emitted from diesel engines. An oxidation catalyst (La 0.6 K 0.4 CoO 3) was prepared by two different methods (sol-gel and co-precipitation). The reduction catalysts: Ag/Al 2 O 3 and Cu-ZSM5 were synthesized by impregnation and ion-exchange method, respectively. The FWC was characterized by N 2sorption, X-ray diffraction, Fourier transform spectroscopy and scanning electron microscopy. The catalytic activities of FWC containing double-layer of catalysts were evaluated in a fixed-bed-tubular-reactor. The highest catalytic activity resulted by the two-layered system of La 0.6 K 0.4 CoO 3 (sol-gel) ? Cu-ZSM5 showing 100% NO conversion to N 2 at 415°C, maximum-temperature of soot-combustion at 410°C, complete C 3 H 8 conversion at 450°C and 100% CO conversion at 388°C. Maximum NO conversion was maintained up to 427°C; conversion started decreasing with further increase in temperature and 75.4% conversion remained up to 450°C. The performance of double-layered-catalytic-system was as follows: La 0.6 K 0.4 CoO 3 (sol-gel) ? Cu-ZSM5 [ La 0.6-K 0.4 CoO 3 (sol-gel) ? Ag/Al 2 O 3 [ La 0.6 K 0.4 CoO 3 (co-ppt) ? Ag/Al 2 O 3 [ La 0.6 K 0.4 CoO 3 (co-ppt) ? Cu-ZSM5.

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Steady-state NH 3 -SCR global model and kinetic parameter estimation for NO x removal in diesel engine exhaust aftertreatment with Cu/chabazite

et al. 2017

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Performance of Cu-ZSM-5 in a Coupled Monolith NSR-SCR System for NOx Removal in Lean-Burn Engine Exhaust

Cited by 5 publications

References 34 publications

Dy-Modified Mn/TiO2 Catalyst Used for the Selective Catalytic Reduction of NO in Ammonia at Low Temperatures

Dy-Modified Mn/TiO2 Catalyst Used for the Selective Catalytic Reduction of NO in Ammonia at Low Temperatures

A four-way catalytic system for control of emissions from diesel engine

Steady-state NH 3 -SCR global model and kinetic parameter estimation for NO x removal in diesel engine exhaust aftertreatment with Cu/chabazite

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