On présente dans cet article les résultats d'une première série de recherches sur la dépollution des gaz d'échappement des moteurs diesel au moyen de pots catalytiques. L'efficacité des catalyseurs à base de platine pour l'oxydation du monoxyde de carbone et des hydrocarbures imbrûlés a pu être établie par des essais sur banc moteur et sur véhicule. L'emploi de certaines phases actives à base de métaux non nobles permet d'autre part d'abaisser la température de début d'oxydation des particules de suie de 380 à 250 °C environ, avec, entre 250 et 350 °C, élimination de 15 à 20 % des produits piégés. L'essai de divers media filtrants a mis en évidence l'importance des phénomènes d'adsorption des revêtements en alumine et a orienté la recherche vers de nouveaux supports pour filtres catalytiques. This article describes the results of a first series of research on the depollution of exhaust gases from diesel engines by catalytic mufflers. The effectiveness of platinum-base catalysts for the oxidation of carbon monoxide and unburned hydrocarbons was determined by test on an engine test bed and on vehicles on the road. The use of some active non-noble metal phases reduced on the other hand the starting oxidation temperature of soot particulates from 380°C to about 250°C, eliminating 15 to 20% of the trapped products between 250 and 350° C. Tests of different filtering media revealed the importance of adsorption phenomena on alumina coatings and directed research toward new supports for catalytic filters.

On presente dans cet article les resultats d'une premiere serie de recherches sur la depollution des gaz d'echappement des moteurs diesel au moyen de pots catalytiques. L'efficacite des catalyseurs a base de platine pour l'oxydation du monoxyde de carbone et des hydrocarbures imbrules a pu etre etablie par des essais sur banc moteur et sur vehicule. L'emploi de certaines phases actives a base de metaux non nobles permet d'autre part d'abaisser la temperature de debut d'oxydation des particules de suie de 380 a 250 °C environ, avec, entre 250 et 350 °C, elimination de 15 a 20 % des produits pieges. L'essai de divers media filtrants a mis en evidence l'importance des phenomenes d'adsorption des revetements en alumine et a oriente la recherche vers de nouveaux supports pour filtres catalytiques.

Infrared study of appropriate partially deuterated species of 1,4-dioxan, 1,4-dithian, 1,4-oxathian and cyclohexane allows us to distinguish between β(CH) axial and ν(CH) equatorial vibrations. A uniform feature of the results is ν(CH)eq>ν(CH)ax. Comparison with previously obtained “isolated” CH frequencies for dimethyl ether, dimethyl sulphide and propane shows β-gauche and β-trans effects of the CO or CS bonds on ν(CH) frequencies. The vicinal CH stretch-stretch interaction force constants f′g. and f′t in 1,4-dioxan have been obtained.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of alcohols on alumina. 1. Gravimetric and infrared spectroscopic investigation. CommentJean-Claude Lavalley, Jack Caillod, and Josette TravertCite this: J. Phys. Chem. 1980, 84, 16, 2083–2084Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 August 1980https://pubs.acs.org/doi/10.1021/j100453a017https://doi.org/10.1021/j100453a017research-articleACS PublicationsRequest reuse permissionsArticle Views65Altmetric-Citations10LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

The i.r. study of (CD3CDO)2(CD3CHO), (CD3CHO)3 and (CH3CHO)3 compounds in the 2600–3100 cm−1 region shows the existence of considerable Fermi resonance interaction between ν(OCHO) and overtones of δ(CH) modes. Results lead to a re-assessment of the earlier assignments of ν(CH) vibrations for s-trioxane.

Chemischer InformationsdienstVolume 11, Issue 39 Article ChemInform Abstract: DEUTERATED DIMETHYL ETHER (CD3OCD2H): A NEW PROBE MOLECULE FOR THE INFRARED STUDY OF LEWIS ACIDITY OF METAL OXIDE ADSORPTION SITES. PART II. ADSORPTION ON ALUMINA J. CAILLOD, J. CAILLODSearch for more papers by this authorJ.-C. LAVALLEY, J.-C. LAVALLEYSearch for more papers by this author J. CAILLOD, J. CAILLODSearch for more papers by this authorJ.-C. LAVALLEY, J.-C. LAVALLEYSearch for more papers by this author First published: September 30, 1980 https://doi.org/10.1002/chin.198039065AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume11, Issue39September 30, 1980 RelatedInformation