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Title: Zeolite-based SCR catalysts and their use in diesel engine emission treatment

Abstract

A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al.sup.+3, wherein the catalyst decreases NO.sub.x emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and/or trivalent lanthanide metal ions. In particular embodiments, the catalysts are selected from Cu--Fe-ZSM5, Cu--La-ZSM-5, Fe--Cu--La-ZSM5, Cu--Sc-ZSM-5, and Cu--In-ZSM5. The catalysts are placed on refractory support materials and incorporated into catalytic converters.

Inventors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1281139
Patent Number(s):
9,403,156
Application Number:
14/662,946
Assignee:
UT-BATTELLE, LLC (Oak Ridge, TN) ORNL
DOE Contract Number:
AC05-00OR22725
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Mar 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Narula, Chaitanya K., and Yang, Xiaofan. Zeolite-based SCR catalysts and their use in diesel engine emission treatment. United States: N. p., 2016. Web.
Narula, Chaitanya K., & Yang, Xiaofan. Zeolite-based SCR catalysts and their use in diesel engine emission treatment. United States.
Narula, Chaitanya K., and Yang, Xiaofan. 2016. "Zeolite-based SCR catalysts and their use in diesel engine emission treatment". United States. doi:. https://www.osti.gov/servlets/purl/1281139.
@article{osti_1281139,
title = {Zeolite-based SCR catalysts and their use in diesel engine emission treatment},
author = {Narula, Chaitanya K. and Yang, Xiaofan},
abstractNote = {A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al.sup.+3, wherein the catalyst decreases NO.sub.x emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and/or trivalent lanthanide metal ions. In particular embodiments, the catalysts are selected from Cu--Fe-ZSM5, Cu--La-ZSM-5, Fe--Cu--La-ZSM5, Cu--Sc-ZSM-5, and Cu--In-ZSM5. The catalysts are placed on refractory support materials and incorporated into catalytic converters.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Patent:

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  • A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al.sup.+3, wherein the catalyst decreases NO.sub.x emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and/or trivalent lanthanide metal ions. In particular embodiments, the catalysts are selected from Cu--Fe-ZSM5, Cu--La-ZSM-5, Fe--Cu--La-ZSM5, Cu--Sc-ZSM-5, and Cu--In-ZSM5. The catalysts are placed on refractory support materials and incorporated into catalytic converters.
  • A process is described for converting feedstock comprising hydrocarbon compounds to conversion product comprising hydrocarbon compounds of lower molecular weight than feedstock hydrocarbon compounds which comprises contacting the feedstock at conversion conditions with a catalyst comprising one or more metal promoters selected from the group consisting of platinum, iridium, palladium, nickel, zinc, chromium, copper, rare earth metals and mixtures thereof and a zeolite having a silica/alumina mole ratio greater than 12 and a constraint index of 1 to 12. The catalyst is steamed in its fresh state under controlled conditions of temperature, time and steam partial pressure so as tomore » initially increase the ..cap alpha..-activity of the catalyst and produce a steamed catalyst having a peak ..cap alpha..-activity, and subsequently reduce the ..cap alpha..-activity from the peak ..cap alpha..-activity to an ..cap alpha..-activity substantially the same as the ..cap alpha..-activity of the fresh catalyst and no more than 25% below the initial ..cap alpha..-activity of the fresh catalyst.« less
  • The present disclosure pertains to a system and method for treatment of oxygen rich exhaust and more specifically to a method and system that combines non-thermal plasma with a metal doped .gamma.-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NO.sub.x reduction as a passive system and only 25 40% reduction when a supplemental hydrocarbon reductant is injected into the exhaust stream. It has been found that treatment of an oxygen rich exhaust initially with a non-thermal plasma and followed by subsequent treatment with a metal doped .gamma.-aluminamore » prepared by the sol gel method is capable of increasing the NO.sub.x reduction to a level of approximately 90% in the absence of SO.sub.2 and 80% in the presence of 20 ppm of SO.sub.2. Especially useful metals have been found to be indium, gallium, and tin.« less
  • Disclosed herein are sorbents and devices for controlling sulfur oxides emissions as well as systems including such sorbents and devices. Also disclosed are methods for making and using the disclosed sorbents, devices and systems. In one embodiment the disclosed sorbents can be conveniently regenerated, such as under normal exhaust stream from a combustion engine, particularly a diesel engine. Accordingly, also disclosed are combustion vehicles equipped with sulfur dioxide emission control devices.