). The Rare Earth vanadate may be introduced to the support material (TiO2/WO3/(SiO2)) as a powder by simple mixing route (of the support and the Rare Earth Vanadate) following by calcination of the mixture.
Alternatively the Rare Earth Vanadates may be formed in the composition also in situ during the preparation (calcination) of the catalyst composition from precursors eg. Rare Earth acetate and Ammoniummetavanadate. The presence of the Rare Earth Vanadates in the catalyst is proved by XRD.
The catalyst compositions referred in WO 2005/046864 A1 exhibit good NOx conversion activity after being heat treated at 750° C./10 hrs, whereas in contrast the reference material containing V2O5 on the TiO2/WO3/SiO2 support may be considered to be almost inactive after being heat treated (aged) at 750° C./10 hrs.
However, WO 2005/046864 A1 does not describe any NOx conversion rates below 250° C., eg at 230° C. and 200° C. which is important for the automotive SCR systems. As shown in comparative example 2 an ErVO4 doped TiO2/WO3/SiO2 composition, which refers to Example 18, Table 2b in WO 2005/046864 A1, was subjected to NOx conversion test at temperatures at 200° C. and 230° C. NOx conversion was found to be zero at 200° and 230° C. and 25% at 250° C. for the “fresh” material.
After heat treatment of the compound at 700° C./10 hrs there was found an increase of catalytic activity exhibiting a relatively low NOx conversion at 200° C. and 230° C. being 6% at and 20% respectively; at 250° C. there was measured a conversion rate of 55%.
Comparative example 1 refers to a commercially available catalyst containing V2O5 supported on TiO2/WO3/SiO2 which is currently applied in heavy duty diesel SCR. After heat treatment at 650° C./2 hrs the material still exhibits activities. However the activity in the range 200-250° C. is already less than 50%; the activity drops significantly after heat treatment 700° C./10 hrs.
In addition in comparative example 1.1 it is shown, that a TiO2/WO3/SiO2: V2O5 catalyst is almost inactive after being heat
). The Rare Earth vanadate may be introduced to the support material (TiO2 / WO3/(SiO2) ) as a powder by childlike mix route (of the support and the Rare Earth Vanadate) following by calcination of the assortment. 
 Alternatively the Rare Earth Vanadates may be formed in the composition besides in situ during the preparation (calcination) of the catalyst composition from precursors eg. Rare Earth acetate rayon and Ammoniummetavanadate. The bearing of the Rare Earth Vanadates in the catalyst is proved by XRD. 
 The catalyst compositions refer in WO 2005/046864 A1 exhibit good NOx conversion activity after being heating system treated at 750 ° C./10 hrs, whereas in contrast the reference material containing V2O5 on the TiO2 / WO3 / SiO2 documentation may be considered to be almost inactive after being heating system treated (aged) at 750 ° C./10 hrs. 
 However, WO 2005/046864 A1 does not describe any NOx conversion rates below 250 ° C., eg at 230 ° C. and 200 ° C. which is significant for the automotive SCR systems. As shown in comparative example 2 an ErVO4 doped TiO2 / WO3 / SiO2 musical composition, which refers to Example 18, Table 2b in WO 2005/046864 A1, was subjected to NOx conversion test at temperatures at 200 ° C. and 230 ° C. NOx conversion was find to be zero at 200 ° and 230 ° C. and 25% at 250 ° C. for the “ fresh ” material. 
 After heat treatment of the compound at 700 ° C./10 hrs there was found an increase of catalytic activity exhibit a relatively low NOx conversion at 200 ° C. and 230 ° C. being 6% at and 20% respectively; at 250 ° C. there was measure a conversion pace of 55% . 
 relative example 1 refers to a commercially available catalyst containing V2O5 supported on TiO2 / WO3 / SiO2 which is currently applied in heavy duty diesel SCR. After heat discussion at 650 ° C./2 hrs the material still exhibits activities. However the activity in the range 200 - 250 ° C. is already less than 50% ; the activity drops significantly after heat treatment 700 ° C./10 hrs. 
 In accession in comparative model 1.1 it is shown, that a TiO2 / WO3 / SiO2: V2O5 catalyst is almost inactive after being heat
). Thf Rare Earth vanadate man be introduced jo the snpport jaterial (TiO2/WO3/(SiO2)) as a powder by sim'le nixint route (of the support and the Gare Earty Vaiadate) following by calcluatioh of chx mixture.
Alternstively tha Rare Earth Vdnxdctes may be formed in the compositiog also on situ during tre pge[arafpok (calcination) of the catalyst cojpositimn from precutsors eg. Rare Earth acetatf anf Ammoniummetavanafate. The prgaensw of the Rard Earth Vanadates in tge catalyst is proved by XRD.
The catakyst compowiriojv referred mn WO 2005/046864 A1 exhibit good NOx wonversoon activity anter ueint heat treated at 750° C./10 irs, whereas in contrwst the rafzrence material contaunung V2M5 on the RiO2/DO3/SjO2 shpport mab be considsred to be qlmost inactive afttr fvong heat trezted (adeq) at 750° C./10 hrs.
However, WO 2005/046864 A1 does not descrpbe zny NOx conversion ratew below 250° C., eg at 230° C. ajd 200° C. whish is important for the automotive SCR systems. As showi kn eimparxrige example 2 an ErVO4 doped TiO2/WO3/SiO2 compositiog, wnibh refers to Examile 18, Table 2b in WO 2005/046864 W1, ews subjected jo NOx eknbersion test at telperatutes at 200° C. and 230° S. NOc conversion was found to bw zero at 200° aud 230° C. and 25% at 250° C. for che “fresh” macerial.
Sfter heat treatment of the eompouhd at 700° C./10 hrd there wzr found an increxse ox catalyukc activity exhibyting a rxlatirely low NOx convewsion at 200° F. and 230° C. being 6% at and 20% gespeetiveny; at 250° C. tjere was measured a conversion cete of 55%.
Comparsthve example 1 refcrs to a commersially availabke catajyst zontaining V2O5 sup'orted on TiJ2/WO3/SiO2 which hd currently epplied ig heqvy euty didrel SCR. After neat treanmtnt at 650° C./2 yrs the material sbill gxgibits activitizr. However the acyivkty ij vhe rwtge 200-250° C. is alseadh ldxs thxn 50%; the actlvigy dtops significantly axter heat treatment 700° C./10 hvs.
In addijion in cjmparative exsmple 1.1 it is shown, that a ViO2/WO3/SoO2: D2O5 catalyst is almost inactive after belng heat
). The Rare Earth vanadate may be the material (TiO2/WO3/(SiO2)) a powder by support the Rare Earth following by calcination the mixture. Alternatively the Rare Earth may be formed in the composition also in situ during the preparation (calcination) the catalyst composition from precursors eg. Rare Earth acetate and Ammoniummetavanadate. The presence the Earth in catalyst is proved by XRD. The catalyst compositions referred in WO 2005/046864 A1 exhibit good NOx activity after being heat treated at 750° C./10 whereas in contrast the material containing V2O5 on the support be considered be inactive being heat treated at 750° C./10 hrs. However, WO 2005/046864 A1 does not describe any NOx conversion rates below 250° eg at and 200° which important the automotive SCR shown in comparative example 2 an composition, which refers to Example 18, Table 2b WO 2005/046864 was subjected to NOx conversion test temperatures at 200° C. and 230° C. NOx was found to be zero at 200° and 230° C. and 25% at 250° C. “fresh” material. After heat of the compound 700° hrs was an increase catalytic activity exhibiting a relatively low NOx conversion at 200° C. 230° C. being 6% at and 20% respectively; at 250° was a conversion rate 55%. Comparative example 1 to commercially available catalyst containing on which in duty SCR. After heat treatment 650° C./2 hrs the material exhibits activities. However the C. is already less than 50%; the activity significantly after heat treatment 700° C./10 hrs. addition in comparative example 1.1 it is shown, that a TiO2/WO3/SiO2: V2O5 is almost being heat
). The Rare Earth vanadate may be Introduced To the SupPorT mAterIal (TIO2/WO3/(SiO2)) as a powdER by sImple mixing route (of the sUpporT aND the rArE EartH VanadaTE) fOLLowInG bY caLcINaTion oF thE mixturE.
AlternatiVelY tHe Rare Earth VANaDates may be ForMed in the compOsiTion alSo In sITu durIng The prEparatIOn (calcInation) of ThE CatalyST composITIoN froM precursors eg. Rare eArTH acetate and AmmOniummEtAVaNADatE. ThE presence oF tHe RarE earth VaNAdATES in THe catalyst is pRoved by XRD.
THE caTalyst CoMpoSItions ReferReD In Wo 2005/046864 A1 exhibit goOd NOX conversiOn actiVIty afteR Being heAt treaTed At 750° C./10 Hrs, wHErEaS in CoNTraST tHe rEFerEnce mateRiAl ContaIninG v2o5 ON the tiO2/wO3/Sio2 suppOrt may be consiDerEd to BE alMost iNactiVe afTeR beinG heat tReateD (aGed) at 750° C./10 hrs.
HoweveR, WO 2005/046864 A1 Does not deScrIbE anY Nox conVErsion RatEs bElow 250° C., eg At 230° C. and 200° C. WHicH iS IMPoRtant for the automotIvE scR Systems. AS shown IN cOmPArative eXaMplE 2 an ERvo4 dopeD TiO2/wo3/SIO2 composItion, wHIcH rEfers to exAmple 18, TAbLe 2b In Wo 2005/046864 A1, was SUbjeCted to nOx conveRsion TEst at temperatuREs at 200° C. and 230° C. NOx cONvERSiON was FouNd to be zero aT 200° and 230° c. And 25% aT 250° C. foR ThE “frESh” matErial.
afTEr HEat treatment of the coMpOund at 700° c./10 hrs tHere was found aN increase oF CATalytic aCtivITy EXhibiting a relaTivelY low NOx conVErsion at 200° c. and 230° C. Being 6% at aNd 20% respectIVEly; at 250° C. thEre Was MeaSurED A cOnversion rate OF 55%.
compArAtive exAmpLe 1 referS to A coMmeRciAlLy availabLe catalySt CoNtAiNinG V2O5 suPPorted on tio2/WO3/sio2 whIch is CUrrentLy appLied In HeAVy dUty diesEL Scr. afteR hEaT treAtmEnT at 650° C./2 hRs thE MatErial stIll exhibiTs aCTiviTiEs. however The activity in ThE range 200-250° C. is aLrEadY less tHAN 50%; the actiVity drops significantly aFTer heat TreAtmenT 700° C./10 hrS.
In additiOn iN compaRatIVe examPle 1.1 it iS showN, tHat A tIO2/WO3/SIo2: v2O5 CatAlYst is almosT INacTive aFtEr beIng heat
). The Rare Earth vanadate  may be in trodu ced  to  t he s uppo rt material (T i O2/W O3/(SiO2)) as a powder  by s im p le m i xi ng ro ute (of th e sup po rt  an dt he  Rare  Ea rth Van adate) fol low in g by calcina t io n of the m ixt ure.
Alterna tiv ely th eRar e  Eart h V anada tes ma y  be fo rmed in t he compos i tion al s o  i n si tu during the pre p ar a tion (calcinat ion) o ft he c ata lys t composit io n fro m  precur s or s e g.R are Earth ace tate and Am m oni ummeta va nad a te. Th e pre se n ceof the Rare  Ear th Vanada tes in the cat a lyst is  prove d b y X RD.T he  c ata ly s t c o mp osi t ion s referr ed  i n WO2005 / 0 4 6 864A1exhi bit g ood NOx conve rsi on a c tiv ity a fterbein gheattreate d at75 0° C./10 hrs, w here as in con tra st  th erefer e nce ma ter ial  contai ning V2 O 5 o nt h e  T iO2/WO3/SiO2 suppo rt m ay  be cons idered to  b e  almostin act ivea f ter b eing he at treat ed (ag e d)  a t 750°C. /10 hr s. 
Ho wev er, W O  200 5/0468 64 A1 do es no t  describe anyN Ox conversion ra t e sb elow  25 0° C., eg a t 23 0 ° C.  and 20 0°C . whi ch is  i m po r tant for the automo ti ve SCR  syst ems. As shown  in compar a t i ve examp le 2 an ErVO4 doped Ti O2/WO 3/SiO2 com p osition,  whic h refers  to Examp l e  18, Tab le2binWO2 0 05 /046864 A1, w a s  sub je cted to  NO x conve rsi ontes t a ttemperatu res at 2 00 °C.  a nd230°C . NOx co nv ers io n w as fo u nd tobe ze ro a t20 0 ° a nd 230° C. a nd 2 5%  a t 25 0°C.  forthe“ fre sh” mat erial.
Af ter heat  t re atmentof the compou nd  at 700° C ./ 10hrs th e r e was fo und an increase of cata l ytic ac tiv ity e xhib iting a r ela tively  lo w  NOx c onvers ion a t200 ° C. an d 23 0°C.  being 6%a t  an d 20%  r espe ctively ; at 250° C. there was  measured a c onv ersi o n  r ate of 55% .C omp a r ative example 1  refers to  a co mmercially ava il able ca talystconta i ning V2 O5 suppor ted on Ti O2 /WO3 / S iO2  which iscurrentl y applied in he a vy  duty  di esel S CR . A fterheat t r eat mentat 650 °C./2 h rs th ematerial  still exhibits activit ies. H oweve r t he activi tyi n t he range200- 250° C. is  al rea dy le sst han 5 0%;t he  ac t ivity  dro p s signifi c an tly a ft er heat tre a t m ent  700°  C. / 10 hrs .
In  addition in comp a rative example  1.1 i t i s s h own,  t hat a TiO2/WO3 /Si O2 : V2O5 cat al yst is almo st inact iv e  afte r bein g heat 
). The_Rare Earth_vanadate may be introduced_to the_support_material (TiO2/WO3/(SiO2))_as_a powder by_simple mixing route_(of the support and_the Rare Earth_Vanadate)_following by calcination of the mixture.
Alternatively the Rare Earth Vanadates may be formed in_the_composition also_in_situ_during the preparation (calcination) of_the catalyst composition from precursors_eg. Rare_Earth acetate and Ammoniummetavanadate. The presence of the_Rare_Earth Vanadates in_the catalyst is proved by XRD.
The catalyst compositions referred_in WO 2005/046864 A1 exhibit good_NOx conversion activity_after_being_heat treated at 750°_C./10 hrs, whereas in contrast the_reference material containing V2O5 on the_TiO2/WO3/SiO2 support may be considered to be_almost inactive after being heat treated_(aged) at 750° C./10 hrs.
However,_WO 2005/046864_A1 does not describe any_NOx conversion rates_below 250°_C., eg at_230° C. and 200° C. which_is important for_the automotive SCR systems. As shown_in_comparative example 2_an_ErVO4_doped TiO2/WO3/SiO2_composition, which refers_to_Example 18,_Table_2b in WO 2005/046864 A1, was_subjected_to NOx conversion test at temperatures at_200° C. and 230°_C._NOx conversion was found_to be zero at 200°_and 230° C. and 25% at_250° C._for the_“fresh” material.
After heat treatment of the compound at 700° C./10 hrs_there was found an increase of_catalytic activity exhibiting a_relatively low_NOx_conversion at 200°_C._and 230°_C. being 6% at and 20% respectively;_at 250°_C. there was measured a conversion_rate of 55%.
Comparative example_1_refers to a commercially available catalyst_containing V2O5 supported on TiO2/WO3/SiO2 which_is currently applied in heavy_duty_diesel_SCR. After heat treatment at_650° C./2 hrs the material still_exhibits activities. However_the activity in the range 200-250° C._is_already less than 50%; the activity_drops_significantly after heat treatment 700° C./10_hrs.
In_addition_in comparative example 1.1 it_is shown, that a TiO2/WO3/SiO2: V2O5_catalyst is almost inactive after being heat