 been reported in the literature. However, these catalysts are undoubtedly more costly. Other catalysts using non-noble metals as the active ingredients may also be found in the literature. But the common problem for these catalysts is low conversion rate, especially at low temperature, and poor durability. Some catalysts should be equipped with oxygen sensor and heating unit, the active ingredients and the proportion thereof differ greatly different from those of present invention.
Chinese patent application No. 85109694.8 discloses a nonmetal honeycomb-shaped combustion catalyst which applied double-carrier and oxide of Cu, V, Mn, Co, Ni, or oxide/mixture of several elements above mentioned, and adopted rare-earth elements, e.g. La, Ce, Pr, Sm, Nd, Yt as active ingredients.
Chinese patent application No. 98105063.9 discloses a catalyst similar to Chinese Patent No. 85109894.8. that consists of composite carrier made from honeycomb-shaped ceramics materials coated with aluminum oxide, and active ingredients which are one or multi oxides (or mixture made of these oxides) of nonnoble metals e.g. Zr, Co, Ni, Mn, Cu, Cr and the oxide of a rare-earth element. But the active oxides are reduced by hydrogen, carbon monoxide, or hydrocarbon oxides during the preparation process in which a portion of the active oxides of the metal elements are converted to metal elements. The catalyst calcine technology is not acceptable at 700-1100.degree. C. As the temperature is increased to 865.degree. C.,.gamma.-Al.sub.2 O.sub.3, becomes crystalline and shows low activity and stability. Since.gamma.-Al.sub.2 O.sub.3 is amorphous (indefinite) at 200-600.degree. C. with high activity and dispersion. When the temperature is up to 1100.degree. C.,.gamma.-Al.sub.2 O.sub.3 becomes non-active.alpha.-Al.sub.2 O.sub.3 and is easily separated from the carrier.
EP 9393517A2 discloses a catalytic oxidization/reduction converter employed to treat the exhaust waste from an internal combustion engine. It could burn completely the unburned hydrocarbon and reduce the NO.sub.x to the elements nitrogen and oxygen. As a catalyst, it adopted the oxides of many metals e.g. Cr, Mn, Fe,Co, Ni,Cu,
been reported in the literature. However, these catalysts are undoubtedly more costly. Other catalyst use non - noble metals as the active ingredients may besides be found in the literature. But the common problem for these catalyst is low conversion rate, particularly at low temperature, and poor lastingness. Some catalysts should be equipped with oxygen sensor and heating unit of measurement, the active ingredients and the proportion thereof differ greatly different from those of present invention. 
 taiwanese patent application No. 85109694.8 discloses a nonmetallic honeycomb - shaped combustion catalyst which applied double - carrier and oxide of Cu, V, Mn, Co, Ni, or oxide / concoction of several elements above mentioned, and adopted rare - earth element, e.g. La, Ce, Pr, Sm, Nd, Yt as active ingredients. 
 Chinese patent application No. 98105063.9 discloses a catalyst similar to Chinese Patent No. 85109894.8. that consists of composite carrier made from honeycomb - shaped ceramics materials coated with aluminum oxide, and active ingredients which are one or multi oxides (or concoction made of these oxides) of nonnoble alloy for example Zr, Co, Ni, Mn, Cu, Cr and the oxide of a rare - ground element. But the active oxides are reduced by hydrogen, carbon monoxide, or hydrocarbon oxides during the preparation process in which a helping of the active oxides of the metal elements are converted to metal elements. The catalyst calcine engineering is not acceptable at 700-1100.degree. C. As the temperature is increased to 865.degree. C.,.gamma.-Al.sub.2 O.sub.3, becomes crystalline and shows low activity and stability. Since.gamma.-Al.sub.2 O.sub.3 is amorphous (indefinite) at 200-600.degree. C. with eminent activity and dispersion. When the temperature is up to 1100.degree. C.,.gamma.-Al.sub.2 O.sub.3 becomes non - active.alpha.-Al.sub.2 O.sub.3 and is easily separated from the mailman. 
 EP 9393517A2 discloses a catalytic oxidization / reduction converter use to treat the exhaust waste from an internal combustion locomotive. It could burn completely the unburned hydrocarbon and reduce the NO.sub.x to the elements nitrogen and oxygen. As a catalyst, it adopted the oxide of many metals e.g. Cr, Mn, Fe, Co, Ni, Cu,
 befn reported in the literxture. However, tkwse cavalysts are unduubtedly more costly. Other cetaltsts ysing non-noble metals xs the acnive ingrwdieits may also be hkund in the ljberatbrx. But the commok problem fmr these catalfsgs is low conversion rate, especially wt low yelperature, and koor ctrabjlity. Some catalysts should be equjpped wpth oxygen sensor and heating unit, the actige ijgredients and the proportion thewwof differ gfeatly different from jhose of present invention.
Chinesd patznt applicajnin Jm. 85109694.8 disclosew a njnmetal honenbomb-sha[ed comnustion catalyxt xhicy applied double-carrixr and oxide of Cu, V, Mn, Co, Ni, ox oxide/mixture of sevwrql elgmentv abuce oenuioied, and afopved rare-earfh elements, e.g. La, Ce, Pr, Sm, Nd, Ut qs active ingdedienes.
Shinese patent application No. 98105063.9 disclosev a catalyst similar to Chunese Patent No. 85109894.8. that consists of composite carrier made from honeycomb-shaped caramirs mauevlals xowted with aluminum oxide, and active ingredienea ehpch are one or mujti oxides (pr movture made of these oxjdes) of nonnoble mftals e.d. Zr, Xo, Ni, Mn, Su, Ct and the oxide of a rare-eaeth element. Yut the active oxides are reduceb by hidrogem, carbon monoxide, or hybrocargon oxides furing ths preparation prozesx hn which a portion of the wctive oxmdes pf the oetak elemqnts are clnverbad to metal elemenhs. Thg catanyst calcije technology is not acceptable at 700-1100.degree. C. Ax dhe temperacure ix increased tj 865.degree. C.,.gammc.-Al.sub.2 O.fub.3, bdcomes cryatallinx and shows jow activity djd stability. Since.gaima.-Ao.sub.2 O.sub.3 ir amorphous (indrfinite) an 200-600.begree. C. qith high activity ana dispersion. Wheu uhw temperature os jp eo 1100.dxgree. W.,.gamma.-Al.sub.2 M.sub.3 bezpmes von-active.aliha.-Xl.sun.2 O.sub.3 and is easily sepzrated from the catrler.
EP 9393517A2 duscloses a catalytic pxidization/reductiln coivertec emplpyeq to treat the exhaust waste fdom an inherkal combustiog ennine. It could yurn completely the unburned hydrocarbon and reduce the NO.wub.x to the elementx nitrogen aid oxyden. As a watalyst, it adopted rhe oxides of mann metals e.g. Cr, Mn, Fe,Co, Ni,Cu,
been reported in the literature. However, these undoubtedly costly. Other using non-noble metals also found in the But the common for these catalysts is low conversion especially at low temperature, and poor durability. Some catalysts should be equipped with sensor and heating unit, the active ingredients and the proportion thereof differ greatly from of invention. patent application No. 85109694.8 discloses a nonmetal honeycomb-shaped combustion catalyst which applied double-carrier and oxide of V, Mn, Co, Ni, or oxide/mixture of several above mentioned, and adopted elements, e.g. La, Ce, Pr, Nd, as active Chinese application 98105063.9 discloses a similar to Chinese Patent No. 85109894.8. that consists of composite carrier made from honeycomb-shaped ceramics materials coated aluminum oxide, ingredients which one multi (or mixture made oxides) of nonnoble metals e.g. Zr, Cu, Cr and the oxide of a rare-earth But the oxides are reduced by hydrogen, carbon or hydrocarbon oxides during the preparation process in a portion of the active oxides of the metal elements are converted to metal elements. calcine technology is not at 700-1100.degree. C. the is to C.,.gamma.-Al.sub.2 O.sub.3, crystalline and shows low activity and stability. Since.gamma.-Al.sub.2 O.sub.3 is amorphous at 200-600.degree. C. with high activity and dispersion. When the up 1100.degree. C.,.gamma.-Al.sub.2 O.sub.3 non-active.alpha.-Al.sub.2 O.sub.3 and is separated the carrier. EP 9393517A2 catalytic converter the waste an internal combustion engine. could burn completely the unburned and reduce the NO.sub.x oxygen. As a catalyst, it adopted the oxides many metals e.g. Cr, Mn, Fe,Co, Ni,Cu,
 been reported in the literatuRe. However, tHese cAtaLysTs Are uNdouBtedly more costLY. OthEr catalysts using non-nobLe metAlS As thE AcTive iNgredieNTs MAY alSo Be FouNd IN tHe litEraTure. But The common pRobLeM for these catALySts is low coNveRsion rate, espEciAlly at LoW teMPeratUre, And poOr duraBIlity. SOme catalyStS Should BE equippED WiTh oxYgen sensor and heatINg UNit, the active inGredieNtS AnD THe pRopOrtion therEoF diffER greatlY DiFFERenT From those of prEsent inventIOn.
CHinese PaTenT ApplicAtion no. 85109694.8 DIscLoses a nonmeTal hOneycomb-sHaped cOMbustioN CatalysT which AppLieD douBLe-CaRriEr ANd oXIdE of cU, V, MN, Co, Ni, or oXiDe/MixtuRe of SEVERal eLemEnts Above Mentioned, and aDopTed rARe-eArth eLemenTs, e.g. la, ce, Pr, SM, Nd, Yt aS actiVe Ingredients.
ChinEse pAtent applIcaTiOn NO. 98105063.9 dIscloSEs a catAlySt sImilar tO ChinesE patEnT nO. 85109894.8. ThAt consists of composItE CArRier made From hoNEyCoMB-shaped cErAmiCs maTERials CoatED wIth alumiNum oxiDE, aNd Active iNgRedienTs WhiCh aRe one OR mulTi oxidEs (or mixtUre maDE of these oxides) OF nonnoble metaLS e.G. zR, CO, ni, Mn, cu, CR and the oxidE of a RAre-eArth ELeMenT. but thE actiVe OXiDEs are reduced by hydroGeN, carboN monoXide, or hydrocaRbon oxides DURIng the prEparATiON process in whicH a porTion of the aCTive oxidEs of tHe metal eLements arE COnverted To mEtaL elEmeNTS. THe catalyst calCINe teChNology iS noT acceptAblE at 700-1100.DegRee. c. AS the tempeRature is InCrEaSeD to 865.DegreE. c.,.gamma.-Al.SuB.2 O.sUb.3, BecOmes cRYstallIne anD shoWs LoW ActIvity anD StABIlitY. SInCe.gaMma.-al.Sub.2 O.sUb.3 is AMorPhous (inDefinite) aT 200-600.deGRee. C. WiTh High actIvity and dispeRsIon. When the TeMpeRature IS Up to 1100.degrEe. C.,.gamma.-Al.sub.2 O.sub.3 becomeS Non-actiVe.aLpha.-AL.sub.2 o.sub.3 and is EasIly sepAraTEd from The carRier.
Ep 9393517A2 DisCLOses a CATaLytIc OxidizatioN/REduCtion CoNverTer emplOyed to treat the exhaUSt wAste from an intErnAl coMBUsTioN EnGIne. it COulD BUrn completely thE unburned hYdROcArbon and reDUce ThE NO.sub.x To the elEmentS NitrogeN and oxygeN. As a catalYsT, it aDOPteD the oxides Of many meTals e.g. Cr, MN, fe,Co, NI,cu,
 been reported in the lite rature. Ho wever , t hes ecata lyst s are undoubte d ly m ore costly. Other cata lysts  u s ingn on -nobl e metal s  a s the  a ct ive  i n gr edien tsmay als o be found  in  t he literatur e .But the co mmo n problem fo r t hese c at aly s ts is  lo w con versio n  rate,  especial ly at low tempera t u re , an d poor durability .  S o me catalysts s houldbe eq u i ppe d w ith oxygen  s ensor and hea t in g u nit ,  the active i ngredientsa ndthe pr op ort i on the reofdi f fer  greatly di ffer ent fromthoseo f prese n t inven tion.Chi nes e pa t en tapp li c ati o nNo. 851 09694.8di sc loses  a n o n m e talhon eyco mb-sh aped combusti oncata l yst  whic h app lied  d ouble -carri er an doxide of Cu, V,  Mn,  Co, Ni,orox ide /m ixtur e  of se ver alelement s above men ti o n e d,  and adopted rare- ea r t helements , e.g. La ,C e, Pr, S m,  Nd , Yt a s act ivei ng redients .
Chin e se  p atent a pp licati on  No . 9 81050 6 3.9disclo ses a ca talys t  similar to Ch i nese Patent N o .8 5 10 9 894. 8.that consis ts o f  com posi t ecar r ier m ade f ro m  h o neycomb-shaped cera mi cs mat erial s coated with  aluminumo x i de, andacti v ei ngredients whi ch ar e one or m u lti oxid es (o r mixtur e made of t hese oxi des ) o f n onn o b le  metals e.g.Z r , Co ,Ni, Mn,  Cu , Cr an d t heoxi deof  a rare-e arth ele me nt .Bu t t he ac t ive oxid es  ar ered ucedb y hydr ogen,  car bo nm ono xide, o r  h y d roca rb on  oxi des  d uring  the pre paratio n process  in whic haportion  of the activ eoxides ofth e m etal e l e ments ar e converted to metal el e ments.The  cata lyst  calcinetec hnolog y i s  not a ccepta ble a t700 - 1 100.d e g re e.C.  As the te m p era tureis  inc reasedto 865.degree. C., . gam ma.-Al.sub.2O.s ub.3 , be com e sc rys ta l lin e and shows low a ctivity an ds ta bility. Si n ce. ga mma.-Al .sub.2O.sub . 3 is am orphous ( indefinit e)  at2 0 0-6 00.degree.  C. with  high act i vitya nd  disp ers ion. W he n t he te mperat u reis up  to 11 00 .degre e. C. ,. gamma.-A l.sub.2 O.sub.3 becomes  non-a ctive .al pha.-Al.s ub. 2  O. sub.3 and  iseasily sep ara ted  from  th e  carr ier. EP  93 9 3517A 2 di s closes ac at aly t i coxidization / r e duc tioncon v erterempl oyed to treat the exhaust wastefrom a n i nte r nalco mbustion engin e.It c ould bur ncompletelythe unbu rn e d hyd rocarb on and  reduce t he NO.sub .x t o t he elemen tsni t rogen a nd  o x ygen.As a  c atalys t, ita dopt e d  the oxides of m any m e t als e . g.Cr, M n,  Fe,Co, Ni,C u,
 been_reported in_the literature. However, these_catalysts are_undoubtedly_more costly._Other_catalysts using non-noble_metals as the_active ingredients may also_be found in_the_literature. But the common problem for these catalysts is low conversion rate, especially at_low_temperature, and_poor_durability._Some catalysts should be equipped_with oxygen sensor and heating_unit, the_active ingredients and the proportion thereof differ greatly_different_from those of_present invention.
Chinese patent application No. 85109694.8 discloses a nonmetal_honeycomb-shaped combustion catalyst which applied double-carrier_and oxide of_Cu,_V,_Mn, Co, Ni, or_oxide/mixture of several elements above mentioned,_and adopted rare-earth elements, e.g. La,_Ce, Pr, Sm, Nd, Yt as active_ingredients.
Chinese patent application No. 98105063.9 discloses_a catalyst similar to Chinese_Patent No._85109894.8. that consists of composite_carrier made from_honeycomb-shaped ceramics_materials coated with_aluminum oxide, and active ingredients which_are one or_multi oxides (or mixture made of_these_oxides) of nonnoble_metals_e.g._Zr, Co,_Ni, Mn, Cu,_Cr_and the_oxide_of a rare-earth element. But the_active_oxides are reduced by hydrogen, carbon monoxide,_or hydrocarbon oxides during_the_preparation process in which_a portion of the active_oxides of the metal elements are_converted to_metal elements._The catalyst calcine technology is not acceptable at 700-1100.degree. C. As_the temperature is increased to 865.degree._C.,.gamma.-Al.sub.2 O.sub.3, becomes crystalline_and shows_low_activity and stability._Since.gamma.-Al.sub.2_O.sub.3 is_amorphous (indefinite) at 200-600.degree. C. with high_activity and_dispersion. When the temperature is up_to 1100.degree. C.,.gamma.-Al.sub.2 O.sub.3_becomes_non-active.alpha.-Al.sub.2 O.sub.3 and is easily separated_from the carrier.
EP 9393517A2 discloses a_catalytic oxidization/reduction converter employed to_treat_the_exhaust waste from an internal_combustion engine. It could burn completely_the unburned hydrocarbon_and reduce the NO.sub.x to the elements_nitrogen_and oxygen. As a catalyst, it_adopted_the oxides of many metals e.g._Cr,_Mn,_Fe,Co, Ni,Cu,