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- W2355605861 abstract "The different kinds of instruments including gas chromatography mass spectrum(GC-MS),infrared spec-troscopy(IR),nuclear magnetic resonance spectrometry(NMR)and thermo gravimetry-mass spectrum(TG-MS)inductively coupled plasma mass spectrum(ICP-MS)were introduced to research the components of the crystal mixture produced in an exhaust pipe of a diesel engine which can meet China stage Ⅳ emission standard with SCR catalyst.The result of dissolution experiments shows that crystal components are mainly organic and inorganic com-pounds.Color reaction test confirms that there are some compounds with two or more peptide linkages in the crystal mixture.Urea,triazine triol,biuret,1,2-hydrazinedicarboxamine,ethyl allophanate and imidodicarbonic acid diethyl ester are detected in the crystal by GC-MS,and free ammonia can be released by heating the crystal mixture.IR test result indicates that crystal mixture includes ammonium salt,secondary ammonium salt,nitro-group(-NO2),methyl-group(-CH3),methene-group(-CH2-),etc.NMR results further validate that double bond and methane bond exist in mixture compounds.Simultaneously,TG-MS experiments show that the molecular and ion groups of carbon,oxygen,nitrogen,amino,ammonia,hydrocyanic acid,cyanamide,isocyanic acid,cyanic acid,amide,etc.are also included in the crystal compounds.At last,the ICP-MS tests show that crystal mixture may absorb or react with diesel exhaust gas.Based on the discussions above,the main components in crystal mixture are urea and triazine triol,biuret.The primary reason that crystal mixture is created is low temperature of initial ureainjection." @default.
- W2355605861 created "2016-06-24" @default.
- W2355605861 creator A5052533229 @default.
- W2355605861 date "2010-01-01" @default.
- W2355605861 modified "2023-09-23" @default.
- W2355605861 title "Components of Crystal from SCR System of a Diesel Engine Compliant with China Stage IV Emission Standard" @default.
- W2355605861 hasPublicationYear "2010" @default.
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