Influence of hydrocarbon species on its adsorption on a VSCR catalyst under simulated diesel engine operating conditions | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

4733946

Reference Type

Journal Article

Title

Influence of hydrocarbon species on its adsorption on a VSCR catalyst under simulated diesel engine operating conditions

Author(s)

Xi, Y; Ottinger, NA; Liu, ZG

Year

2017

Is Peer Reviewed?

Yes

Journal

Applied Catalysis B: Environmental
ISSN: 0926-3373

Volume

217

Page Numbers

581-590

Language

English

DOI

10.1016/j.apcatb.2017.05.077

Web of Science Id

WOS:000405158000057

Abstract

Vanadia-SCR (VSCR) is a proven technology for reducing diesel engine NOx emissions using urea hydrolysis derived NH3 as a reductant. It is also known that VSCR is active for hydrocarbon (HC) oxidation. However, HC species from diesel engine exhaust may be adsorbed onto VSCR at low exhaust temperatures such as under low engine load or idle conditions. The adsorbed HC may be gradually transformed into more stable coke during engine operation. The accumulated HC or coke on VSCR can result in decreased NOx conversion efficiency due to blockage of catalyst pores and active sites. In addition, rapid oxidation of accumulated HC or coke can lead to exotherms which can thermally damage the VSCR and may lead to vanadium and tungsten release. This work investigates the fundamental adsorption characteristics of HC species on a state-of-the-art VSCR catalyst in the low temperature region. Dodecane and toluene are used as model molecules for alkane and aromatic species from unburned diesel fuel, while squalane is used as a model molecule for unburned lube oil. (C) 2017 Elsevier B.V. All rights reserved.

Keywords

Vanadia SCR; Hydrocarbon adsorption; Temperature programmed oxidation; Dodecane; Toluene; Squalane