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Themed collection Selective catalytic reduction of NOx

12 items
Accepted Manuscript - Paper

Transport and Reaction in Washcoated Monoliths:Cu-SSZ-13 Selective Catalytic Reduction and Dual-Layer Cu-SSZ-13 + Pt/Al2O3 Ammonia Slip Catalyst

From the themed collection: Selective catalytic reduction of NOx
Paper

Site selective adsorption and relocation of SOx in deactivation of Cu–CHA catalysts for NH3-SCR

SO2 selectively interacts with Z-CuOH in Cu–CHA catalysts for NH3-SCR and relocates to Z2-Cu during heating at 550 °C.

Graphical abstract: Site selective adsorption and relocation of SOx in deactivation of Cu–CHA catalysts for NH3-SCR
From the themed collection: Selective catalytic reduction of NOx
Paper

Mechanism-based kinetic modeling of Cu-SSZ-13 sulfation and desulfation for NH3-SCR applications

A multi-site kinetic model was developed capable of predicting the sulfation and desulfation of Cu-SSZ-13 for the NH3 selective catalytic reduction (NH3-SCR) of NOx.

Graphical abstract: Mechanism-based kinetic modeling of Cu-SSZ-13 sulfation and desulfation for NH3-SCR applications
From the themed collection: Selective catalytic reduction of NOx
Minireview

Tracking mobile active sites and intermediates in NH3-SCR over zeolite catalysts by impedance-based in situ spectroscopy

Impedance-based in situ spectroscopy allows direct tracking of the mobile active sites and reaction intermediates in NH3-SCR over zeolite catalysts.

Graphical abstract: Tracking mobile active sites and intermediates in NH3-SCR over zeolite catalysts by impedance-based in situ spectroscopy
From the themed collection: Selective catalytic reduction of NOx
Open Access Paper

The dynamic nature of Cu sites in Cu-SSZ-13 and the origin of the seagull NOx conversion profile during NH3-SCR

Systematic catalytic tests and in situ/operando spectroscopy uncovered structure–performance relationships determining the seagull profile of the NOx conversion for Cu-SSZ-13 catalysts.

Graphical abstract: The dynamic nature of Cu sites in Cu-SSZ-13 and the origin of the seagull NOx conversion profile during NH3-SCR
From the themed collection: Selective catalytic reduction of NOx
Perspective

Perspective on SCR NOx control for diesel vehicles

The selective catalytic reduction of NOx with aqueous urea (“urea SCR”) is originally a steady-state technology that has been successfully applied to diesel vehicles worldwide. This Perspective summarizes 20+ years of SCR system research, design, and future improvements.

Graphical abstract: Perspective on SCR NOx control for diesel vehicles
From the themed collection: Selective catalytic reduction of NOx
Paper

Simulation of exotherms from the oxidation of accumulated carbonaceous species over a VSCR catalyst

A model is built to simulate the burn-off process of accumulated carbonaceous species over a VSCR catalyst.

Graphical abstract: Simulation of exotherms from the oxidation of accumulated carbonaceous species over a VSCR catalyst
From the themed collection: Selective catalytic reduction of NOx
Review Article

From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NOx adsorbers for low-temperature control of emissions from diesel engines

Passive NOx adsorbers as new components to complement SCR catalysts to control cold-start NOx emissions efficiently.

Graphical abstract: From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NOx adsorbers for low-temperature control of emissions from diesel engines
From the themed collection: Selective catalytic reduction of NOx
Review Article

Recent advances in the preparation of zeolites for the selective catalytic reduction of NOx in diesel engines

Metal-exchanged zeolites with small pore sizes have attracted much attention in recent years due to their application in the selective catalytic reduction (SCR) of NOx in diesel engines.

Graphical abstract: Recent advances in the preparation of zeolites for the selective catalytic reduction of NOx in diesel engines
From the themed collection: Selective catalytic reduction of NOx
Paper

Temperature-dependent dynamics of NH3-derived Cu species in the Cu-CHA SCR catalyst

In situ XAS and UV-vis–NIR spectroscopy shed light on Cu-speciation during NH3 temperature-programmed desorption and surface reaction (TPSR) over a commercial Cu-chabazite deNOx catalyst, expanding the fundamental knowledge required to unravel the NH3-SCR mechanism across the whole operation-relevant temperature range.

Graphical abstract: Temperature-dependent dynamics of NH3-derived Cu species in the Cu-CHA SCR catalyst
From the themed collection: Selective catalytic reduction of NOx
Paper

Inter-particle migration of Cu ions in physically mixed Cu-SSZ-13 and H-SSZ-13 treated by hydrothermal aging

Physically mixed Cu-SSZ-13 and H-SSZ-13 catalysts were prepared using two different methods to control the extent of contact. Migration of Cu ions between particles is proved by discrepancy of two physical mixed catalysts.

Graphical abstract: Inter-particle migration of Cu ions in physically mixed Cu-SSZ-13 and H-SSZ-13 treated by hydrothermal aging
From the themed collection: Selective catalytic reduction of NOx
Paper

Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

Iron-exchanged high-silica LTA zeolites exhibit high activity for selective catalytic reduction of NOx by NH3, even after hydrothermal aging at 900 °C.

Graphical abstract: Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts
From the themed collection: Selective catalytic reduction of NOx
12 items

About this collection

From RCE

Guest Editors: Professor Rajamani Gounder (Purdue University) and Dr Ahmad Moini (BASF)

The discovery of Cu-CHA was a significant breakthrough in automotive emissions catalysis, resulting in the selection of urea-SCR as the technology of choice for NOx removal from diesel exhaust. Since its commercial implementation one decade ago, research on the science and technology of urea-SCR on Cu-/Fe-CHA zeolites has proliferated rapidly, and is now a major topic of investigation in the catalysis and reaction engineering communities worldwide.

In this RCE themed collection, we showcase the global impact of this problem of major environmental significance, and the diverse chemistry and engineering approaches that are being used to study it.

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