Study on patent literature of catalysts for a new NOx removal process

Tabata, Takeshi; Kokitsu, Mikako; Okada, Osamu

doi:10.1016/0920-5861(94)80098-7

Cited by 64 publications

(26 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, 10g of zeolite Beta was slurried, for 24 h at room temperature, in 1000 ml of distilled water containing copper (II) acetate with the adequate concentration to achieve the desired ion exchange. To prepare samples with more than 100% Cu ion exchange, an amount of NH 4 OH was added and the pH was adjusted to 6.0. The Cu exchanged zeolite was collected by filtration and washed extensively with distilled water.…”

Section: Methodsmentioning

confidence: 99%

Determining the Nature of the Active Sites of Cu-Beta Zeolites for the Selective Catalytic Reduction (SCR) of NOxby Using a Coupled Reaction-XAES/XPS Study

Corma

Palomares

Márquez

1997

Journal of Catalysis

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Determining the Nature of the Active Sites of Cu-Beta Zeolites for the Selective Catalytic Reduction (SCR) of NOxby Using a Coupled Reaction-XAES/XPS Study

Corma

Palomares

Márquez

1997

Journal of Catalysis

View full text Add to dashboard Cite

“…The NO x in engine exhaust is composed primarily of NO; consequently, aftertreament schemes have focused a great deal on the reduction of NO. Selective catalytic reduction (SCR) by hydrocarbons [1][2] is one of the leading catalytic aftertreatment technologies for the reduction of NO x in lean-burn engine exhaust. In lean-NO x SCR, the oxidation of NO to NO 2 serves an important role in enhancing the efficiency for reduction of NO x to N 2 .…”

Section: Introductionmentioning

confidence: 99%

Plasma-Assisted Catalytic Reduction of NOx

Penetrante

Brusasco

Merritt

et al. 1998

SAE Technical Paper Series

View full text Add to dashboard Cite

August 24, 1998This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. ABSTRACTMany studies suggest that lean-NO x SCR proceeds via oxidation of NO to NO 2 by oxygen, followed by the reaction of the NO 2 with hydrocarbons. On catalysts that are not very effective in catalyzing the equilibration of NO+O 2 and NO 2 , the rate of N 2 formation is substantially higher when the input NO x is NO 2 instead of NO. The apparent bifunctional mechanism in the SCR of NO x has prompted the use of mechanically mixed catalyst components, in which one component is used to accelerate the oxidation of NO to NO 2 , and another component catalyzes the reaction between NO 2 and the hydrocarbon. Catalysts that previously were regarded as inactive for NO x reduction could therefore become efficient when mixed with an oxidation catalyst. Preconverting NO to NO 2 opens the opportunity for a wider range of SCR catalysts and perhaps improves the durability of these catalysts. This paper describes the use of a non-thermal plasma as an efficient means for selective partial oxidation of NO to NO 2 . When combined with some types of SCR catalyst, the plasma can greatly enhance the NO x reduction and eliminate some of the deficiencies encountered in an entirely catalyst-based approach.

show abstract

“…This catalyst is very active in nitric oxide reduction and also nitrous oxide decomposition, is more resistant against SOx and water vapor than Cu-ZSM-5, has a good heat resistance and operates by SCR with methane as reducing agent. This last feature is especially important for gas-fuelled or stationary engines [5,6].…”

Section: Introductionmentioning

confidence: 99%

Ceramic honeycombs coated with zeolite Co-ZSM-5 for Nox abatement

Rak

Veringa

1997

React Kinet Catal Lett

View full text Add to dashboard Cite

A deNO~ catalyst was prepared by wash-coating a cobalt ion exchanged ZSM-5 zeolite together with an alumina binder on a cordierite honeycomb structure. A few types of the Co-ZSM-5 based catalysts were tested for NO• reduction with C2I-L trader oxidizing conditions in the temperature range between 250-600~ Preliminary tests of the catalytic activity of the systems showed NO• reduction up to 95% at temperatures between 400-550~ using a mixture of a synthetic gas and air as reactant.

show abstract

Study on patent literature of catalysts for a new NOx removal process

Cited by 64 publications

References 2 publications

Determining the Nature of the Active Sites of Cu-Beta Zeolites for the Selective Catalytic Reduction (SCR) of NOxby Using a Coupled Reaction-XAES/XPS Study

Determining the Nature of the Active Sites of Cu-Beta Zeolites for the Selective Catalytic Reduction (SCR) of NOxby Using a Coupled Reaction-XAES/XPS Study

Plasma-Assisted Catalytic Reduction of NOx

Ceramic honeycombs coated with zeolite Co-ZSM-5 for Nox abatement

Contact Info

Product

Resources

About