schliessen

Filtern

 

Bibliotheken

Supercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst

Catalytic oxidation of ammonia in supercritical water (SCW) was studied using a continuous-flow, packed-bed reactor at temperatures ranging from 410 to 470 C, a nominal pressure of 27.6 MPa, and reactor residence times of less than 1 s. The kinetics and catalyst performance of MnO{sub 2}/CeO{sub 2}... Full description

Journal Title: Industrial & Engineering Chemistry Research 05/1998, Vol.37(5), pp.1707-1716
Main Author: Ding, Zhong Yi
Other Authors: Li, Lixiong , Wade, Daniel , Gloyna, Earnest F.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0888-5885 ; E-ISSN: 1520-5045 ; DOI: http://dx.doi.org/10.1021/ie9709345
Zum Text:
SendSend as email Add to Book BagAdd to Book Bag
Staff View
recordid: crossref10.1021/ie9709345
title: Supercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst
format: Article
creator:
  • Ding, Zhong Yi
  • Li, Lixiong
  • Wade, Daniel
  • Gloyna, Earnest F.
subjects:
  • Energy Conservation, Consumption, And Utilization
  • Ammonia
  • Oxidation
  • Supercritical State
  • Water
  • Manganese Oxides
  • Cerium Oxides
  • Catalytic Effects
  • Hazardous Materials
  • Waste Processing
  • Chemical Reaction Kinetics
  • Kinetic Equations
  • Morphological Changes
ispartof: Industrial & Engineering Chemistry Research, 05/1998, Vol.37(5), pp.1707-1716
description: Catalytic oxidation of ammonia in supercritical water (SCW) was studied using a continuous-flow, packed-bed reactor at temperatures ranging from 410 to 470 C, a nominal pressure of 27.6 MPa, and reactor residence times of less than 1 s. The kinetics and catalyst performance of MnO{sub 2}/CeO{sub 2} for oxidation of ammonia in SCW was evaluated. In this reaction environment, ammonia was predominantly converted into molecular nitrogen (N{sub 2}), and the rate of ammonia conversion was enhanced by MnO{sub 2}/CeO{sub 2}. For example, 40% of the ammonia was converted when using the MnO{sub 2}/CeO{sub 2} catalyst at a temperature of 450 C and a reactor residence time of 0.8 s. It was reported that, without a catalyst, essentially no ammonia conversion was observed below 525 C and 10% of the ammonia was converted at a temperature of 680 C, a pressure or 24.6 MPa, and a reactor residence time of 10 s. Kinetic models developed for the gas-phase catalytic oxidation of ammonia were adopted and proven to be adequate for catalytic oxidation of ammonia in supercritical water. The best-fit global rate expression for catalytic supercritical water oxidation of ammonia by MnO{sub 2}/CeO{sub 2} was obtained as follows: r = 1.14 {times} 10{sup 14} exp({minus}189 kJ/mol/RT) [NH{sub 3}]{sup 0.63}[O{sub 2}]{sup 0.71}. The BET surface area and X-ray diffraction analyses of the exposed catalyst indicated a significant reduction of surface area and changes in the crystalline structure of the catalyst.
language: eng
source:
identifier: ISSN: 0888-5885 ; E-ISSN: 1520-5045 ; DOI: http://dx.doi.org/10.1021/ie9709345
fulltext: no_fulltext
issn:
  • 08885885
  • 0888-5885
  • 15205045
  • 1520-5045
url: Link


@attributes
ID1257085722
RANK0.07
NO1
SEARCH_ENGINEprimo_central_multiple_fe
SEARCH_ENGINE_TYPEPrimo Central Search Engine
LOCALfalse
PrimoNMBib
record
control
sourcerecordid10.1021/ie9709345
sourceidcrossref
recordidTN_crossref10.1021/ie9709345
sourceformatXML
sourcesystemOther
display
typearticle
titleSupercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst
creatorDing, Zhong Yi ; Li, Lixiong ; Wade, Daniel ; Gloyna, Earnest F.
ispartofIndustrial & Engineering Chemistry Research, 05/1998, Vol.37(5), pp.1707-1716
identifier
languageeng
source
lds41199805
subjectEnergy Conservation, Consumption, And Utilization ; Ammonia ; Oxidation ; Supercritical State ; Water ; Manganese Oxides ; Cerium Oxides ; Catalytic Effects ; Hazardous Materials ; Waste Processing ; Chemical Reaction Kinetics ; Kinetic Equations ; Morphological Changes;
descriptionCatalytic oxidation of ammonia in supercritical water (SCW) was studied using a continuous-flow, packed-bed reactor at temperatures ranging from 410 to 470 C, a nominal pressure of 27.6 MPa, and reactor residence times of less than 1 s. The kinetics and catalyst performance of MnO{sub 2}/CeO{sub 2} for oxidation of ammonia in SCW was evaluated. In this reaction environment, ammonia was predominantly converted into molecular nitrogen (N{sub 2}), and the rate of ammonia conversion was enhanced by MnO{sub 2}/CeO{sub 2}. For example, 40% of the ammonia was converted when using the MnO{sub 2}/CeO{sub 2} catalyst at a temperature of 450 C and a reactor residence time of 0.8 s. It was reported that, without a catalyst, essentially no ammonia conversion was observed below 525 C and 10% of the ammonia was converted at a temperature of 680 C, a pressure or 24.6 MPa, and a reactor residence time of 10 s. Kinetic models developed for the gas-phase catalytic oxidation of ammonia were adopted and proven to be adequate for catalytic oxidation of ammonia in supercritical water. The best-fit global rate expression for catalytic supercritical water oxidation of ammonia by MnO{sub 2}/CeO{sub 2} was obtained as follows: r = 1.14 {times} 10{sup 14} exp({minus}189 kJ/mol/RT) [NH{sub 3}]{sup 0.63}[O{sub 2}]{sup 0.71}. The BET surface area and X-ray diffraction analyses of the exposed catalyst indicated a significant reduction of surface area and changes in the crystalline structure of the catalyst.
version2
lds50peer_reviewed
links
openurl$$Topenurl_article
thumbnail
0$$TPCamazon_thumb
1$$TPCgoogle_thumb
openurlfulltext$$Topenurlfull_article
addlink$$Uhttp://exlibris-pub.s3.amazonaws.com/aboutCrossref.html$$EView_CrossRef_copyright_notice
search
creatorcontrib
0Ding, Zhong Yi
1Li, Lixiong
2Wade, Daniel
3Gloyna, Earnest F.
titleSupercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst
general
0English
110.1021/ie9709345
2American Chemical Society (via CrossRef)
3American Chemical Society (CrossRef)
sourceidcrossref
recordidcrossref10.1021/ie9709345
issn
008885885
10888-5885
215205045
31520-5045
rsrctypearticle
addtitle
0Industrial & Engineering Chemistry Research
1Ind. Eng. Chem. Res.
searchscope
0crossref_acs
1CrossRef
2Crossref
3crossref
scope
0crossref_acs
1CrossRef
2Crossref
3crossref
lsr40199805
lsr41199805
lsr43199805
lsr45199805
tmp012
tmp022
creationdate1998
startdate19980501
enddate19980531
citationpf 1707 pt 1716 vol 37 issue 5
lsr30VSR-Enriched:[subject, description]
sort
titleSupercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst
authorDing, Zhong Yi ; Li, Lixiong ; Wade, Daniel ; Gloyna, Earnest F.
creationdate19980500
lso0119980500
facets
frbrgroupid2250025791675184390
frbrtype5
languageeng
creationdate1998
collectionAmerican Chemical Society (CrossRef)
prefilterarticles
rsrctypearticles
creatorcontrib
0Ding, Zhong Yi
1Li, Lixiong
2Wade, Daniel
3Gloyna, Earnest F.
jtitleIndustrial & Engineering Chemistry Research
toplevelpeer_reviewed
delivery
delcategoryRemote Search Resource
fulltextno_fulltext
addata
aulast
0Ding
1Li
2Wade
3Gloyna
aufirst
0Zhong Yi
1Lixiong
2Daniel
3Earnest F.
au
0Ding, Zhong Yi
1Li, Lixiong
2Wade, Daniel
3Gloyna, Earnest F.
atitleSupercritical Water Oxidation of NH 3 over a MnO 2 /CeO 2 Catalyst
jtitleIndustrial & Engineering Chemistry Research
stitleInd. Eng. Chem. Res.
risdate199805
adddate199805
volume37
issue5
spage1707
epage1716
pages1707-1716
issn0888-5885
eissn1520-5045
formatjournal
genrearticle
ristypeJOUR
doi10.1021/ie9709345
lad012
date1998-05