Keeb Kwm thiab Qhov Xwm Txheej Dav Dav
Cov khoom tsis tshua muaj avyog lub rooj hauv pem teb ntawm IIIB scandium, yttrium thiab lanthanum hauv lub rooj periodic. Muaj l7 cov ntsiab lus. Lub ntiaj teb tsis tshua muaj cov khoom siv lub cev thiab tshuaj lom neeg tshwj xeeb thiab tau siv dav hauv kev lag luam, kev ua liaj ua teb thiab lwm yam teb. Qhov huv ntawm cov khoom sib xyaw ua ke ntawm lub ntiaj teb tsis tshua muaj ncaj qha txiav txim siab cov khoom tshwj xeeb ntawm cov ntaub ntawv. Qhov huv sib txawv ntawm cov khoom siv av tsis tshua muaj tuaj yeem tsim cov khoom siv ceramic, cov khoom siv fluorescent thiab cov khoom siv hluav taws xob nrog cov kev xav tau kev ua tau zoo sib txawv. Tam sim no, nrog rau kev txhim kho ntawm cov thev naus laus zis rho tawm av tsis tshua muaj, cov khoom sib xyaw ua ke ntawm lub ntiaj teb tsis tshua muaj huv si muaj kev cia siab zoo hauv kev ua lag luam, thiab kev npaj cov khoom siv av tsis tshua muaj kev ua tau zoo siab ua rau muaj kev xav tau ntau dua rau cov khoom sib xyaw ua ke ntawm lub ntiaj teb tsis tshua muaj huv si. Cerium compound muaj ntau yam kev siv, thiab nws cov txiaj ntsig hauv feem ntau daim ntawv thov yog cuam tshuam nrog nws qhov huv, cov khoom siv lub cev thiab cov ntsiab lus tsis huv. Hauv kev faib tawm ntawm cov khoom sib xyaw ua ke ntawm lub ntiaj teb tsis tshua muaj, cerium suav txog li 50% ntawm cov khoom siv av tsis tshua muaj teeb. Nrog rau kev siv ntau ntxiv ntawm cerium purity siab, qhov yuav tsum tau muaj cov ntsiab lus tsis yog av tsis tshua muaj rau cov khoom sib xyaw ua ke ntawm cerium yog siab dua thiab siab dua.Cerium oxideyog ceric oxide, CAS tus lej yog 1306-38-3, cov mis molecular yog CeO2, qhov hnyav molecular: 172.11; Cerium oxide yog cov oxide ruaj khov tshaj plaws ntawm cov khoom siv hauv ntiaj teb tsis tshua muaj cerium. Nws yog cov khoom daj daj ntawm chav tsev kub thiab ua rau tsaus dua thaum cua sov. Cerium oxide yog siv dav hauv cov ntaub ntawv luminescent, catalysts, polishing hmoov, UV shielding thiab lwm yam vim nws qhov kev ua tau zoo heev. Nyob rau hauv xyoo tas los no, nws tau ua rau muaj kev txaus siab ntawm ntau tus kws tshawb fawb. Kev npaj thiab kev ua tau zoo ntawm cerium oxide tau dhau los ua qhov chaw tshawb fawb kub hauv xyoo tas los no.
Cov Txheej Txheem Tsim Khoom
Txoj Kev 1: Do ntawm chav sov, ntxiv cov tshuaj sodium hydroxide ntawm 5.0mol/L rau hauv cov tshuaj cerium sulfate ntawm 0.1mol/L, kho tus nqi pH kom ntau dua 10, thiab cov tshuaj nag los tshwm sim. Cov av noo tau raug pumped, ntxuav ntau zaus nrog dej deionized, thiab tom qab ntawd ziab hauv qhov cub 90 ℃ rau 24 teev. Tom qab sib tsoo thiab lim (qhov loj me me dua 0.1 hli), cerium oxide tau txais thiab muab tso rau hauv qhov chaw qhuav rau kev khaws cia kaw. Txoj Kev 2: Siv cerium chloride lossis cerium nitrate ua cov khoom siv raw, kho tus nqi pH rau 2 nrog dej ammonia, ntxiv oxalate rau cerium oxalate precipitate, tom qab cua sov, kho, sib cais thiab ntxuav, ziab ntawm 110 ℃, tom qab ntawd hlawv rau cerium oxide ntawm 900 ~ 1000 ℃. Cerium oxide tuaj yeem tau txais los ntawm kev cua sov cov khoom sib xyaw ntawm cerium oxide thiab carbon hmoov ntawm 1250 ℃ hauv huab cua ntawm carbon monoxide.
Daim Ntawv Thov
Cerium Oxide yog siv rau cov khoom ntxiv rau kev lag luam iav, cov khoom sib tsoo iav phaj, thiab tau nthuav dav mus rau kev sib tsoo iav, cov iav tsom iav, kinescope, bleaching, clarification, iav ntawm ultraviolet hluav taws xob thiab kev nqus ntawm cov hlau hluav taws xob, thiab lwm yam. Nws kuj tseem siv ua tus tiv thaiv kev cuam tshuam rau lub lens tsom iav, thiab cerium yog siv los ua cerium titanium daj kom ua rau iav daj. Lub hauv paus oxidation av tsawg muaj qee qhov cuam tshuam rau crystallization thiab cov khoom ntawm cov iav ceramics hauv THE CaO-MgO-AI2O3-SiO2 system. Cov txiaj ntsig kev tshawb fawb qhia tau hais tias kev ntxiv ntawm lub hauv paus oxidation tsim nyog yog qhov zoo rau kev txhim kho cov nyhuv clarification ntawm cov kua iav, tshem tawm cov npuas, ua kom cov qauv iav compact, thiab txhim kho cov khoom siv kho tshuab thiab alkali tsis kam ntawm cov ntaub ntawv. Qhov ntau ntxiv zoo tshaj plaws ntawm cerium oxide yog 1.5, thaum nws siv rau hauv cov khoom siv ceramic glaze thiab kev lag luam hluav taws xob ua tus piezoelectric ceramic penetrant. Nws kuj tseem siv rau hauv kev tsim cov catalyst ua haujlwm siab, roj teeb incandescent npog, X-ray fluorescent screen (feem ntau siv rau hauv lens polishing agent). Cov hmoov txhuam cerium uas tsis tshua muaj neeg siv dav hauv cov koob yees duab, cov tsom iav yees duab, lub raj duab TV, lub tsom iav, thiab lwm yam. Nws kuj siv tau rau hauv kev lag luam iav. Cerium oxide thiab titanium dioxide siv tau ua ke los ua kom iav daj. Cerium oxide rau kev tshem xim iav muaj qhov zoo ntawm kev ua haujlwm ruaj khov ntawm qhov kub siab, tus nqi qis thiab tsis nqus tau lub teeb pom kev. Tsis tas li ntawd, cerium oxide ntxiv rau cov iav siv hauv tsev thiab tsheb kom txo qhov kev xa tawm ntawm lub teeb ultraviolet. Rau kev tsim cov khoom siv luminescent uas tsis tshua muaj neeg siv, cerium oxide ntxiv rau hauv cov phosphors tri-xim uas tsis tshua muaj neeg siv hauv cov khoom siv txuag hluav taws xob ntawm cov teeb pom kev zoo thiab cov phosphors siv hauv cov ntsuas thiab cov khoom siv hluav taws xob. Cerium oxide kuj yog cov khoom siv raw rau kev npaj cov hlau cerium. Tsis tas li ntawd, hauv cov ntaub ntawv semiconductor, cov xim zoo thiab cov khoom siv iav photosensitive, cov tshuab lim pa tawm hauv tsheb tau siv dav. Cov catalyst rau kev lim pa tawm hauv tsheb feem ntau yog tsim los ntawm cov khoom siv honeycomb ceramic (lossis hlau) thiab cov txheej txheem ua kom nto. Cov txheej txheem ua kom muaj zog muaj thaj chaw loj ntawm gamma-trioxide, cov oxides tsim nyog uas ua kom thaj chaw ruaj khov, thiab cov hlau nrog cov haujlwm catalytic faib tawm hauv cov txheej txheem. Yuav kom txo tau cov Pt kim, Rh koob tshuaj, nce cov koob tshuaj ntawm Pd pheej yig heev, txo cov nqi ntawm catalyst yam tsis txo cov pa phem ntawm lub tsheb hauv qab qhov kev ua tau zoo sib txawv, feem ntau siv Pt. Pd. Kev ua kom muaj Rh ternary catalyst txheej, feem ntau yog txoj kev nkag mus rau hauv tag nrho kom ntxiv qee qhov ntawm cerium oxide thiab lanthanum oxide, tsim cov nyhuv catalytic tsis tshua muaj av zoo heev. Cov hlau muaj nqis ternary catalyst. Lanthanum oxide thiab cerium oxide tau siv los ua cov neeg pabcuam los txhim kho kev ua tau zoo ntawm ¦ A-Alumina txhawb nqa cov hlau zoo catalysts. Raws li kev tshawb fawb, cov txheej txheem catalytic ntawm cerium oxide thiab lanthanum oxide yog feem ntau los txhim kho cov haujlwm catalytic ntawm cov txheej txheem ua haujlwm, kho qhov sib piv ntawm huab cua-roj thiab catalysis, thiab txhim kho kev ruaj khov thermal thiab lub zog kho tshuab ntawm tus neeg nqa khoom.