Sezvatinoziva tese, zvicherwa zvepasi zvisingawanzo muChina zvinonyanya kuumbwa nemwenje isingawanzo mativi epasi, ayo lanthanum uye cerium account inodarika 60%. Nekuwedzera kwezvinhu zvisingawanzo gineti zvemagineti zvepasi, zvisingawanzo kupenya pasi pevhu, isingawanzo kupenya ivhu uye isingawanzo muindasitiri yesimbi muChina gore negore, kudiwa kwepasi repakati uye rinorema risingawanzo mumusika wepamba kuri kuwedzera nekukurumidza. Izvo zvakonzera kuseri kwemvura zhinji isingawanzo mwenje sepasi seCe, La uye Pr, izvo zvinotungamira mukusaenzana kukuru kwekushandiswa kwepasi pakati peChina. Zvinoonekwa kuti chiedza chisingawanzoitiki zvinhu zvepasi zvinoratidza zvakanaka catalytic performance uye kushanda zvakanaka mumakemikari reaction process nekuda kweiyo yakasarudzika 4f electron shell chimiro. Naizvozvo, Kushandisa mwenje isingawanzo pasi sechinhu chinokonzeresa inzira yakanaka yekushandisa zvizere zviwanikwa zvepasi. Catalyst imhando yezvinhu inogona kukurumidza kuita kemikari uye haidyiwe isati yasvika uye mushure mekuita. Kusimbisa tsvakiridzo yekutanga yeasingawanzo pasi catalysis haingogone kuvandudza kugona kwekugadzira, asi zvakare kuchengetedza zviwanikwa uye simba uye kuderedza kusvibiswa kwezvakatipoteredza, izvo zvinoenderana nehurongwa hwekuvandudza budiriro.
Sei zvinhu zvisingawanzoitiki zvepanyika zvine kuita kwekuita?
Zvinhu zvisingawanzo pasi zvine chimiro chekunze chemagetsi chekunze (4f), iyo inoshanda seatomu yepakati peiyo yakaoma uye ine nhamba dzakasiyana-siyana dzekubatanidza kubva pa6 kusvika ku12. Kusiyana kwenhamba yekubatana kwezvinhu zvisingawanzoitiki zvepasi zvinotarisa kuti vane "residual valence". Nemhaka yokuti 4f ine nomwe dzekuchengetedza valence electron orbitals nekwanisi yekubatanidza, inobata basa re "backup chemical bond" kana "residual valence". Naizvozvo, zvisingawanzo zvinhu zvepasi hazvisi chete zvine chekuita nekuita, asi zvakare zvinogona kushandiswa sezvinowedzera kana cocatalysts kuvandudza mashandiro emagetsi ezvinokonzeresa, kunyanya kurwisa-kuchembera kugona uye anti-chepfu kugona.
Parizvino, basa re nano cerium oxide uye nano lanthanum oxide mukurapwa kwemoto unopopota rave chinhu chitsva chekutarisa.
Zvinhu zvinokuvadza mukupopota kwemotokari zvinonyanya zvinosanganisira CO, HC uye NOx. Ivhu risingawanzo shandiswa mupasi risingawanzwisisike mota exhaust purification catalyst rinonyanya musanganiswa wecerium oxide, praseodymium oxide uye lanthanum oxide. Iyo isingawanzo yepasi mota inopedza exhaust yekuchenesa catalyst inoumbwa neakaoma oxides epasi isingawanzo uye cobalt, manganese uye lead. Irwo rudzi rweternary catalyst ne perovskite, spinel type uye chimiro, umo cerium oxide ndiyo chikamu chinokosha.Nekuda kwemaitiro eredox ecerium oxide, zvikamu zvemhepo inopedza gasi inogona kunyatsogadziriswa.
Mota exhaust purification catalyst inonyanya kuumbwa nemuzinga we ceramic (kana simbi) inotakura uye pamusoro inobatidzwa coating. Iyo yakashongedzwa yejasi inoumbwa nenzvimbo hombe γ-Al2O3, yakaringana huwandu hweokisidhi yekudzikamisa pamusoro penzvimbo uye catalytically inoshanda simbi yakapararira mujasi. Kuderedza kushandiswa kwePT uye RH, wedzera kudhinda kwePD uye kuenderera mberi nekuita kwePT-PD yakanakisa catalytic mhedzisiro. La2O3 (UG-La01) uye CeO2 yakashandiswa sevanosimudzira kuvandudza mashandiro eγ- Al2O3 inotsigirwa inoyevedza simbi inokonzeresa. Zvinoenderana netsvagiridzo, CeO2, Iyo huru meshini yeLa2O3 mune inoyevedza simbi catalysts ndeiyi inotevera:
1. kunatsiridza basa rinokonzera rejasi rinoshanda nekuwedzera CeO2 kuchengetedza simbi yakakosha yesimbi yakapararira mumucheka unoshanda, kuitira kuti udzivise kuderedzwa kwecatalytic lattice points uye kukanganisa kwechiitiko chinokonzerwa nekupisa. Kuwedzera CeO2 (UG-Ce01) muPt/γ-Al2O3 inogona kupararira pa γ-Al2O3 muchikamu chimwe chete (iyo yakawanda yakawanda ye-single-layer dispersion is 0.035g CeO2/g γ-Al2O3), iyo inoshandura nzvimbo yepamusoro ye γ-Al2O3 uye inovandudza Pt kupararira kune dhigirii yeO2 kusvika kuOspersion. chikumbaridzo, dispersion degree yePt inosvika pakakwirira. Iyo yekuparadzira chikumbaridzo cheCeO2 ndiyo yakanakisa dosi yeCeO2. Mumhepo ine oxidation iri pamusoro pe600 ℃, Rh inorasikirwa nekuita kwayo nekuda kwekugadzirwa kwemhinduro yakasimba pakati peRh2O3 neAl2O3. Kuvapo kweCeO2 kunoderedza maitiro pakati peRh neAl2O3 uye kuchengetedza kushandiswa kweRh. La2O3 (UG-La01) inogonawo kudzivirira kukura kwePt ultrafine particles.Kuwedzera CeO2 uye La2O3 (UG-La01) kuPd / γ 2al2o3, zvakaonekwa kuti kuwedzera kweCeO2 kwakakurudzira kupararira kwePd pamutakuri uye yakabudisa kuderedzwa kwe synergistic. Kupararira kwepamusoro kwePd uye kushamwaridzana kwayo neCeO2 paPd / γ2Al2O3 ndiyo kiyi yebasa repamusoro rekugadzirisa.
2. Auto-adjusted air-fuel ratio (aπ f) Kana tembiricha yekutanga yemotokari ichikwira, kana kana iyo yekutyaira modhi nekumhanya ichichinja, iyo exhaust flow rate uye exhaust gasi kuumbwa kushanduka, izvo zvinoita kuti mamiriro ekushanda emotokari apedzisire gasi rekuchenesa catalyst anogara achichinja uye anokanganisa maitiro ayo anokonzeresa. Zvakakosha kugadzirisa π mafuta emhepo kusvika ku stoichiometric ratio ye 1415 ~ 1416, kuitira kuti iyo catalyst inogona kupa kutamba kwakakwana kune basa rayo rekucheneswa.CeO2 is a variable valence oxide (Ce4 + ΠCe3 +), iyo ine maitiro eN-type semiconductor, uye ine yakanakisa kuchengetedza okisijeni uye kuburitsa simba. Kana iyo A π F chiyero ichichinja, CeO2 inogona kuita basa rakanaka mukugadzirisa zvine simba chiyero chemafuta emhepo. Ndiko kuti, O2 inosunungurwa kana mafuta ari akawandisa kubatsira CO uye hydrocarbon oxidize; Kana mhepo yakawandisa, CeO2-x inobata basa rekudzikisa uye inopindirana neNOx kubvisa NOx kubva kune gasi rekubuda kuti uwane CeO2.
3. Mhedzisiro yecocatalyst Kana musanganiswa weaπ f uri mu stoichiometric ratio, kunze kweiyo oxidation reaction yeH2, CO, HC uye kuderedzwa kwekuita kweNOx, CeO2 secocatalyst inogonawo kukurumidza kufamba kwegasi remvura uye kushanduka kwemhepo inogadzirisa uye kuderedza zvinyorwa zveCO neHC. La2O3 inogona kuvandudza chiyero chekushandura mumvura gasi rekufamba-famba uye hydrocarbon steam reforming reaction.Iyo yakagadzirwa hydrogen inobatsira NOx kuderedza. Kuwedzera La2O3 kuPd / CeO2 -γ-Al2O3 yekuparara kwemethanol, zvakaonekwa kuti kuwedzerwa kweLa2O3 kwakadzivisa kuumbwa kwe-product dimethyl ether uye kwakagadzirisa basa rinokurudzira rekugadzirisa. Kana zvinyorwa zveLa2O3 zviri 10%, iyo catalyst ine basa rakanaka uye methanol shanduko inosvika pakakwirira (inenge 91.4%). Izvi zvinoratidza kuti La2O3 ine kupararira kwakanaka pa γ-Al2O3 mutakuri. Uyezve, yakakurudzira kupararira kweCeO2 pa γ2Al2O3 mutakuri uye kuderedzwa kweokisijeni yakawanda, yakawedzera kuvandudza kupararira kwePd uye yakawedzera kusimbisa kuwirirana pakati pePd neCeO2, nokudaro kuvandudza basa rinokonzera remethanolyst deposition.
Zvinoenderana nehunhu hwekuchengetedzwa kwezvakatipoteredza uye nzira yekushandiswa kwesimba idzva, China inofanirwa kugadzira zvinhu zvisingaite zvepasi zvine kodzero dzakazvimirira dzezvivakwa, kuwana mashandisiro akasimba ezviwanikwa zvepasi, kusimudzira hunyanzvi hwekuvandudza tekinoroji yezvinhu zvisingaite zvepasi zvinokonzeresa, uye kuona kusvetukira-mberi kwemhando yepamusoro-soro masumbu emaindasitiri akadai sepasi risingawanikwe, nharaunda uye simba idzva.
Parizvino, zvigadzirwa zvinopihwa nekambani zvinosanganisira nano zirconia, nano titania, nano alumina, nano aluminium hydroxide, nano zinc oxide, nano silicon oxide, nano magnesium oxide, nano magnesium hydroxide, nano mhangura oxide, nano yttrium oxide, nano cerium oxide, nano, nano silicon oxide, nano oxide nano oxide, nano antibacterial agent uye graphene.Unhu hwechigadzirwa hwakagadzikana, uye hwakatengwa mumabheti nemabhizinesi emarudzi akawanda.
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Nguva yekutumira: Jul-04-2022