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TI:VT LIU PEROVSKITE

TRNG H BCH KHOA TP. HCMKHOA K THUT HA HCNGNH HA V CMn K THUT XC TCGVHD : ThS. NG THANH AN

Thnh vin: Trn Nguyn Tho61103264Trn Nh Qunh61102865

Nm hc 2014 - 20151NI DUNG TRNH BYGii thiu v perovskite.Xc tc LaCoO3 trong phn ng oxi-ha Metan CH4

LaCoO3

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Phng php tng hp LaCoO3 Xc tc quang ha LaCoO3

VT LIU PEROVSKITE2I. Gii thiu v perovskitePerovskite c pht hin ln u tin vng ni Uran ca Nga nm 1839 v c t tn theo nh khong hc ngi Nga L.A.Perovski.

Phn ln cc xc tc s dng trong cng nghip ha hc hin i da trn hn hp oxit kim loi. Trong s , cc oxit kim loi hn hp dng perovskite c quan tm hn c. Cng thc tng qut ca perovskite l ABO3 (l l cation c kch thc ln hn B. )

Perovskite:CaTiO3Sodalite:Na8Al6Si6O24Cl2I. Gii thiu v perovskiteCu trc perovskite l tng l lp phng vi vng khong trng Pm3mOh1. Perovskite loi oxit c cng thc chung ABX3 (A, cation ca kch thc ln hn, B c th l Mn, Ti, Co v X l aniom) . Trong cu trc ny B c s phi tr l 6 v A l 12.

Chng c cc tnh cht vt l v ha hc rt a dng do 90% cc kim loi t nhin trong bng h thng tun hon bn vng trong cu trc perovskite.

Cu trc tinh th vt liu perovskite: (a), cation B, hoc (b), cation A trung tm ca n vI. Gii thiu v perovskiteCc perovskite chc cc kim loi chuyn tip nh Co, Mn, Fe rt c quan tm trong lnh vc bo v mi trng *oxi ha CO v hydrocacbon, kh NO2) Tuy nhin, cc perovskite c b mt ring thp ( 0.09 nm v rB > 0.051 nm trong trng hp i vi cc oxit.

Ngoi yu cu v bn knh ion, cc iu kin khc c tha mn l cn bng in tch, tc l tng in tch ca cc ion A v B bng tng in tch anion X.

iu ny t c trong trng hp ca cc oxit c phn b in tch dng A1+B5+O3, A2+B4+O3 hoc A3+B3+O3.

Cc perovskite ABO3 b bin tnh khi c pha tp s to ra trng thi hn hp ho tr v sai lch cu trc lm cho hp cht nn tr thnh vt liu c nhiu tnh cht: hiu ng nhit in, hiu ng t tr khng l, hiu ng t nhit

II. Tng qut v LaCoO3

LaCoO3 vi cu trc perovskite ABO3 in hnh thu ht c rt nhiu s ch nh vo kh nng xc tc cao, chi ph thp v thn thin vi mi trng. Th nhng, vn cha c nghin cu nhiu v kh nng xc tc quang ca mnh.Cho thy mu kh ng u m kch thc mu tng i nh (