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190 Tong hop va nghien cdu kha nang xuc tac ciia cac oxit kim loai TONG HOP VA NGHIEN ClTU KHA NANG XUC TAC CUA CAC OXIT KIM LOAI KIEU SPINEN TRONG PHAN ITNG DIEU CHE STIREN TU ETYLBENZEN Hoa Hiru Thu[.]
190 Tong hop va nghien cdu kha nang xuc tac ciia cac oxit kim loai TONG HOP VA NGHIEN ClTU KHA NANG XUC TAC CUA CAC OXIT KIM LOAI KIEU SPINEN TRONG PHAN ITNG DIEU CHE STIREN TU ETYLBENZEN Hoa Hiru Thu, Vii Thanh Nam Trudng Dai hpc Khoa hpc Tu nhien Ha Thu Huang Vien Ddu Khi Nguyen Thj Thu Ha TT Nghien ciru vd Phdt trien Che bien Ddu TOM TAT Hien stiren dugc sdn xudt vai sdn lugng tren todn cdu Id khodng 16 trieu tdn/ndm theo hai qud trinh: dehydro hda etylbenzen vd epoxi hda propen bdng etylbenzenhydroperoxit Dehydro hda etylbenzen la qud trinh dugc sic dung rdng rdi cdng nghiep Trong qud trinh ndy nguai ta diing cdc xiic tdc tren ca sa sdt oxit vd nhiet dp phdn icng cao khodng 87OK su cd mat cua hai nuac Cdc xiic tdc ky thudt thuang chira mpt luang nhd mdt sd oxit kim logi khdc ddng vai trd ldm chdt tdng tdc cdu triic Idm dn dmh xiic tdc vd ngdn ngira sir kit tinh lgi ciia pha hogt dpng xuc tdc Ddi vai cdc xiic tdc sdt oxit, chdt tdng tdc thudng Id KiO, nhung dp hogt dpng ciia xiic tdc vdn gidm ddn qud trinh phdn irng Ddi vai viec sdn xudt stiren ngodi qud trinh dehydro hda etylbenzen a quy md cdng nghiep, cdn cd cdc qud trinh khdc dang dugc nghiin cim Trong bdo cdo ndy, chiing tdi tdng hgp mpt vdi ddy xiic tdc oxU kim logi kiiu spinen AB2.,rB., 'O4 (A =Ni'', Cu''; B=Cr^' vd B '=Fe : x=0; 0,5; 1; 1.5 vd 2) theo cdc phuang phdp khdc nhau: phdn icng a trgng thdi rdn vd ddng kit tiia, xdc dinh mdt sd ddc trung cdu tnic vd tinh chdt be mat cua chiing vd ddnh gid khd ndng xiic tdc cua chiing phdn irng dehydro hda etylbenzen thdnh stiren Cdc kit qud thuc nghiem da chi rdng cdc spinen ddy CuCr2.:,Fefi4 (x=0;0,5;l;l,5;2) cd dp hogt dpng xiic tdc cao nhdt phdn img oxi dehydro hda etylbenzen thdnh stiren su cd mat ciia hai nuac MODAU Trong nhtrng nam gan day, stiren dugc tieu thy cang tang Stiren duge diing lam nguyen lieu dau eho tdng hgp cac polime va copolime San lugng stiren tren thi gidi vao khoang 16 trieu tan/nam [9] Stiren dugc san xuit theo bai each: (1) dehydro hda etylbenzen va (2) epoxi hda propen bang etylbenzenhidropeoxit vdi sy cd mat ciia eae xiic tac phuc molipden va stiren thu duge nhu mdt san pham phy qua trinh phan ung [1] Phan img dehydro hda etylbenzen tuomg ty phan img dehydro hda cac ankan Qua trinh dehydro hda etylbenzen thdng thudng la mdt qua trinh thu nhiet, thuan nghjeh, cin quay vdng chat tham gia phan img (etylbenzen) va ty le boi nudc/etylbenzen cao Bdi vay qua trinh can sir dung xuc tac Cac xuc tac truyen thdng cho phan img la sit oxit dugc tang tdc bang KiO [3, 4, 6] Tuy nhien, ngudi ta thay rang boat dgng ciia xuc tae bj Tuygn tap bao cao Hgi nghj KHCN "30 nSm Phu Vift Nam: Cff hgi mdi, thach thde mdi' 191 giam di mdt each bit thuan nghich qua trinh su dung cac ion K^ chuyen djch tir bl mat vao sau tbi tich xuc tac [4, 7] Chinh vi the viec tim kiem xuc tac mdi cho phan img dugc cac nha san xuit edng nghiep ciing nhu cae nha khoa hgc xuc tae quan tam, ddng thdi nhilu ky thuat dugc dua de nang cao hieu qua san xuat stiren Cac ky thuat lam tang bieu suat stiren ed the gdm cac giai phap: • Dehydro hda etylbenzen, tiep theo oxi hda hidro de cung cap nhiet cho phan img dehydro hda thu nhiet va lam chuyen djch can bang ve phia tao stiren • Oxidehidro hda phat nhiet de lam chuyen djch can bang phan img ve phia tao san pham va tien banh phan img d nhiet thap hon • Diing mang xuc tac de chuyen djch can bang ve phia tao stiren va tien banh phan img d nhiet thap hom Bang dudi day trinh bay kha nang xuc tac, cac ky thuat san xuat stiren va hien trang iing dyng cua cae ky thuat san xuat stiren [8] Bang 1: So sanh cac hieu nang xiic tac ciia cac giai phap ky thuat khae de san xuat stiren tir etylbenzen Ky thudt sdn xudt Dehydro hda Dehydro hda/ oxi hda hidro Oxi dehidro hda Oxi dehidro hda Ky thuat mang Do chgn loc stiren, % 90 Nhiet phdn irng, °C 600 - 650 Fe/K/Cr/O Hien trgng icng dung Cdng nghiep 90 605 Cdng nghe SMART Thuang mai 90 90 94 350 480 625 Carbon molsieve V/Mg/O Fe/K/V/Li/Cr/O Nghien ciiu Nghien cim Nghien cim Xiic tde Trong nhdng nam gan day, cd nhieu cdng trinh cdng bd kha nang xuc tac tdt cua cac oxit kim loai kieu spinen cho phan img dehydro hda etylbenzen stiren [5] Cac oxit kim loai kieu spinen cd cac cation kim loai phan bd tren cac mat tinh the (110) va (111) cd kha nang xue tae eho cac phan urng dehydro hda bidrocacbon isopropanol, xiclohexanol [1] Trong bao cao chiing tdi dieu che mdt vai day spinen bae ba cd cdng thuc chung: AB2.xB,'04 (C) day A = Ni^^, Cu^^; B = Cr^^ va B' = Fe^^), xac djnh cac dac trung cau true va hinh thai cua chung va danh gia kha nang xue tae eua chiing phan ung oxi dehydro hda etylbenzen stiren THUC NGHIEM \ Dieu che spinen Cd nhieu phuong phap dieu che spinen bae ba Trong bao cao nay, chung tdi sir dyng bai phuomg phap dieu che spinen AB2.xBx'04 (x = 0; 0, 5; 1; 1,5 va 2) dugc trinh bay dudi day Phuang phdp phdn irng a trang thdi rdn Trong phuomg phap nay, chung tdi da dung eae kim loai oxit NiO, Cr203 va Fe203 cd tinh khilt PA lam nguyen lieu diu dl dilu ebl cac spinen NiCr2.xFex04 (x = 0; 0, 5; 1; 1,5 va 2) Caeh lam nhu sau: Dau tien, tinh toan cae lugmg kim loai oxit theo cdng thue d tren ein phai lay, sau dd can lay lugmg oxit da tinh duge tren can phan tich Trdn cac oxit kim loai cdi su that can than 30 phut eho cae oxit phan tan that diu Tdng hgp va nghien cdu kha nang xiie tac cua eae oxit kim loai 192 bdn hgp Tilp theo dem ep vien bdt xue tae dudi ap lye 2000N/em^ Cho cac vien xuc tae vao chen nung va dat chen nung ehiia xue tac vao Id nung va ddt ndng Id nung den 1300°C Giir nhiet ciia Id nung d 1300°C gid Dl ngudi xue tac binh hut im sau dd dap vd vien xuc tac va ray lay cae hat xue tae cd dudng kinh tir 0,5 den 1mm Phan ung hda bgc tao spinen d nhiet cao 1300°C nhu sau: 2NiO + XFCJOB + (2-x)Cr203 -> 2NiCr2.xFex04 Khi X = 0, phan img tao spinen nhu sau: NiO + Cr203 -> NiCr204 Chung tdi ciing dieu che hai loai spinen NiCr2.xFex04 va CuCr2.xFex04 (x = 0; 0, 5; 1; 1,5 va 2) bing phuomg phap ddng ket tiia de so sanh va ngudn kim loai la cae nitrat kim loai tuong iing b Phuang phdp ddng ket tda Bang 2: Cac mau spinen thu dvcre bang cac phirotig phap dieu che khae Sd TT 10 11 12 13 14 15 Phuang phap dieu che Phan img d trang thai ran Ddng ket tiia Ddng ket tiia Cac s pinen Cdng thirc Ky hiiu NC (I) NiCr204 NCF (I) NiCri_5Feo,504 NCF (I) NiCrFe04 NCF (I) NiCro,5Fei,504 NF (I) NiCr204 NiCr204 NiCri,5Feo,504 NiCrFe04 NiCro,5Fei,504 NiFe204 CuCr204 CuCri_5Feo,504 CuCrFe04 CuCro,5Fei,504 CuFe204 NC (II) NCF (II) NCF (II) NCF (II) NF (II) CC I (II) CCF (II) CCF (II) CCF (II) CF (II) Day la mdt phuong phap dom gian va rit thuan tien dl dilu ehi cac spinen bae ba Trong phuomg phap nay, chiing tdi dung ngudn kim loai la cac nitrat: Ni(NO3)3.6H20, Cu(N03)2.6H20, Cr(N03)3.9H20 va Fe(N03)3.9H20, tit ca ed tinh khilt PA (Aldrich) Cac spinen NiCr2.xFex04 va CuCr2.xFex04 dugc dilu chi nhu sau: Diu tien, tinh toan cac lugmg mudi kim loai can thiet phai liy theo edng thirc eua spinen mudn dilu ebl Can cac lugmg mudi tren can phan tieh va hda tan chung vao nude cho thu dugc cae dung djch mudi 10% theo trgng lugng Trdn cae dung djch mudi cdc lit va ddt ndng dung djch den 80°C Giir dung djch d nhiet va khuiy manh them vao dd timg phin nhd dung djch NH4OH 5% din pH = Giir nhiet cua dung djch d 80°C gid de ket tiia hoan toan cac kim loai Lge kit tua va rira din hit NO ~ bing nude cit Lay ket tua vao ede va siy khd d 120°C gid Trong siy d 120°C ed thi loai dugc nude bj hap phy va tao nen mdt phan cac lien ket kim loai - oxi - kim loai khdi ran thu duge Cudi cung, nung chit rin d 750°C gid Bing cae each Tuyin tap bao cao Hgi nghj KHCN "30 nam DSu Vift Nam: Co hgi mdi, thach thde mdi" 193^ Cac phu-oTig phap vat ly nghien cihi xiic tac Cae gian dd nhilu xa tia X ciia tat ca cac mau deu dugc ghi tren may SIEMENS D5005 diing ngudn CuK^ vdi dai sdng ciia tia X la 1,5406A Cac anh SEM dugc chup tren may JSM 5410 LV, Japan Cac phd hong ngoai chuyen hda Fourier, FTIR duge ghi tren may Nicolet-760, Magra, USA Dien tich be mat rieng eua mau duge tren may Auto sorb 01 Quantachrom, USA He thdng phan irng danh gia hoat dong xiic tac va phan tich san pham long Phan ling oxidehydro hda duge tien hanh d pha hoi mdt dng phan img chua mdt ldp xuc tac cd dinh Ong phan img dugc ddt ndng bang mdt Id dien, dugc khdng che bang mdt thiet bj dieu khien ky thuat sd Nhiet duge theo ddi bang mdt cap nhiet dien va hien thj tren thiet bj Chat phan iing dugc dua vao vung xuc tac qua mdt may bom xilanh ed the dieu khien duge tde bom San pham ldng dugc thu lay sau lam lanh qua dng sinh ban va dem phan tich tren may sac ky khdi phd GC-MS HP6890 KET QUA VA THAO LUAN Cac spinen la cac dung djch ran thdng thudng dugc dieu che theo img dyng cua chung Cac spinen cd the dugc hinh d cac nhiet khae phu thudc vao cae tien chat dugc su dyng de dieu che chung Trong phuomg phap phan img d trang thai ran, tat ca cac tien chat deu nam dudi dang eae oxit kim loai nen nhiet phan img rat cao, 1300°C: 2NiO + xFe203 + (2-x)Cr203 I300"C > 2NiCr7-vFevO (x = 0;0,5;l;I,5;2) Day la qua trinh don gian nhung rat tdn nang lugng dien Trong cac phan iimg d trang thai ran nay, NiO tdn tai d trang thai ran vdi cau tnic lap phuang tam khdi, sd phdi tri cua Ni^"^ va O"^" la 6; Cr203 va Fe203 cd cau tnic luc phuong, dd cae spinen cd cau tnic lap phuomg tam mat Cac cau tnic kha gan nen d nhiet 1300"C (nhiet rat xa diem ndng chay cua cac oxit va spinen) nhung spinen van dugc hinh Trong thdi gian nung, mang cac anion O^' coi nhu dung yen, cdn cac cation Ni^"^, Cr''"^, Fe^"^ chuyen ddi vao cae vj tri tu dien va bat dien cua cau tnic spinen tao nen san pham phan ting Qua trinh khuech tan cua eae cation kim loai hinh spinen cd the dugc hinh dung nhu sau (Hinh I) Pha spinen Pha NiO N.^* Cr^ Pha Cr:0, Ni^ Fe^ Pha FejO, Hinh 1: Sff tao spinen bae ba NiCr2.xFe,04 d nhiet cao Tong hgp va nghien cdu kha nang xiic tac ciia cac oxit kim loai •., 194 That vay, tat ca cac gian dd nhieu xa ciia cae san phim NC (I), NCF (I), NCF (I), NCF (I), NF (I), (Hinh 2) cho phep khang djnh cac spinen da duge hinh W U H N - S l b M t N i UioOa Li>*« W«u Nt-I N\,h^, NLh, Hinh 2: Gian nhieu xa tia X ciia cac spinen NiCr2.xFex04 (x = 0; 0,5; 1; 1,5; 2) thu duffc bang phirotig phap phan irng d trang thai ran Cae qua trinh phan iing d trang thai ran cd the tuong tu nhu qua trinh ket tinh vdi su sap xep lai eua Ni^"^ vao vj tri tu dien va Cr^"^, Fe^"^ vao cac vj tri bat dien Vi the, cae vi tinh the spinen dugc hinh luc ban dau cd the xem chung nhu eae mam ket tinh tao dieu kien cho su hinh tinh the spinen Anh SEM cua mau NC (I) da minh hga giai thich tren (Hinh 3) (a) (b) Hinh 3: Anh SEM ciia cac mau spinen a) Mau NiCr204 thu dugc bang phuang phap phan ung d trang thai rin b) Mau NiCr204 thu dugc bang phuomg phap ddng ket tua Tu Hinh 3, ta cung cd thi thiy cd tinh tbI NC (I) ldn hom NCF (II) Cac kit qua nghien cuu bang IR dugc trinh bay Bang cung khang djnh ciu tnic eua spinen da thu duoc Tuygn tap bao eao Hdi nghj KHCN "30 nam Dgu Vift Nam: Cff hgi mdi, thach thde mdi'' 195 Bang 3: Cac vung hap thu hong ngoai cua cac mau spinen Cac bang h ap thu hong ngoai cua cac mau, cm"' Dao dpng ciia cdc lien kit kim logi oxi tu dien -620 [3] Dao dpng eiia cdc lien kit kim logi oxi bdt dien -530 f3J NC (I) NCF (I) NCF (I) NCF (I) NF (II) 600 638 627 633 627 447 495 466 433 423 NC (II) NCF (II) NCF (II) NCF (II) NF (II) 610 604 664 621 517 507 554 514 1378 1344 1439 — — — — CC (II) CCF (II) CCF (II) CCF (II) CF (II) 630 620 625 625 595 528 456 529 449 443 — 1644 1634 1656 Cac spinen Su cd mat cua nitrat NO] -1390 f3J Su cd mdt cua nude -1670 f3] — — — — — — — — — — 1634 1664 1638 1342 1351 1341 1338 — — Cac mau ran thu dugc bang phuong phap ddng ket tua ciing dugc chup nhieu xa tia X (XRD) Cac ket qua thu dugc dugc trinh bay Bang khang djnh cac chat ran dd la cac spinen mong mudn Bang 4: Cac khoang each mang lirdi (dhik) dirtfc tinh tu* cac gian nhieu xa tia X cua cac mau: NiCr2-xFex04 va CuCr2.xFex04 thu diro"c bang phirotig phap dong ket tua so vdi NiCr2.xFex04 thu dirac bang phirotig phap phan irng d trang thai ran Mat dhik theo 111 220 311 222 400 422 tai lieu [3] 4,81 2,93 2,40 2,40 2,08 1,70 111 220 311 222 400 4,81 2,93 2,40 2,40 2,08 hlk dhik cua cac spinen NiCr2-xFex04 thu dugc ban^; phuong phap ddng ket tua NCF (II) NCF (II) NC (II) NCF (II) 4,79 4,80 4,81 4,80 2,94 2,95 2,95 2,95 2,51 2,51 2,50 2,51 2,40 2,40 2,40 2,41 2,08 2,08 2,08 2,08 1,70 1,69 1,69 1,70 dhik cua cac spine;n CuCr2-xFex04 thu dugc banj; phuong phap ddng ket tua CC (II) CCF (II) CCF (II) CCF (II) CCF (II) 4,80 4,79 4,79 4,79 4,79 2,94 2,93 2,94 2,95 2,94 2,51 2,51 2,49 2,51 2,51 2,41 2,41 4,42 2,31 2,42 2,08 2,06 2,07 2,09 2,09 Tdng hop va nghien cdu kha nang xuc tac ctia cac oxit kim loai 196 422 1,70 111 220 311 222 400 422 4,81 2,93 2,40 2,40 2,08 1,70 — 1,70 dhik ciia cac spinen NiCr2-xFex04 thu dugc bang phuong phap phan img d trang thai ran NCF (I) NCF (I) NCF (I) NC (I) 4,81 4,79 4,79 4,80 2,93 2,93 2,90 2,95 2,50 2,50 2,48 2,51 — — 2,40 2,41 2,07 2,07 2,07 2,08 1,69 1,69 1,69 1,70 Tu cac dir kien thye nghiem duge trinh bay d tren cho thay qua phuomg phap ddng kit tua cd thi dilu chi dugc cac spinen bae ba AB2.xBx'04 (A = Ni ^, Cu "^; B = Cr va B' = Fe^"") d nhiet thip hom, 750°C so vdi nhiet cua phuomg phap phan img d tr^ng thai rin, 1300°C dilu ehi NiCr2.xFex04 Mgt nh^n xet nira la theo phuong phap ddng kit tua cd hat cua spinen nhd hom, cd dien tich be mat khoang 20m /g (Hinh 3) Ta bilt ring: phin xue tac, phuong phap dieu che xuc tac, cac dieu kien dilu chi nhu nhiet do, mdi trudng phan ung, v.v anh hudng tdi boat dgng xiic tac cua chung Bang trinh bay cac ket qua danh gia boat dgng xiic tac ciia cac spinen phan ung oxi dehydro hda etylbenzen stiren Bang 5: Thanh phan ciia san pham long thu du-ffc phan uiig oxi dehydro hoa etylbenzen stiren d nhiet khae nhau, toe ddng khdng 1,01/ph, toe the tich 0,6h"' Xiic tac NC (I) NCF (I) NCF (I) NCF (I) NF5(I) NC (II) NCF (II) NCF (II) NCF (II) Nhiet dp phan ling, ^C 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 Do chuyen hda etylbenzen, % 12,31 17,71 33,79 14,15 21,32 38,14 19,20 34,47 61,43 18,71 31,38 47,65 16,25 28,69 46,44 21,72 22,52 32,37 26,45 34,15 40,26 21,17 43,43 58,82 16,67 Dp chgn lge stiren, % 45,31 39,52 36,80 66,29 61,30 53,20 92,90 92,40 91,21 78,07 70,07 64,30 78,29 69,45 59,12 56,06 57,63 40,76 72,60 65,15 64,47 92,14 85,60 82,60 87,58 Hieu suat toluen+benzen, % 54,69 60,48 63,20 32,71 38,70 45,19 6,18 6,54 8,70 21,41 28,16 35,40 21,45 30,06 35,22 40,15 41,23 55,58 20,33 30,75 33,51 6,74 13,21 16,79 11,56 Tuygn tap bao cao Hdi nghj KHCN "30 nam DSu Vift Nam: Cff hgi mdi, thach thde mdi" NCF (II) CCl (II)'*' CCF (II)'*' CCF (II)'*' CCF (II)'*' CF (II)''' 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 350 400 450 38,43 43,52 15,71 28,36 40,08 35,27 47,03 98,21 30,42 51,62 70,14 40,01 70,23 70,23 39,56 65,42 78,95 29,94 38,18 52,12 71,13 69,63 79,83 72,52 60,13 93,69 70,72 47,76 92,78 89,43 57,15 78,27 90,17 69,20 81,17 72,06 70,45 95,19 96,72 78,84 J ^ 24,43 30,04 18,81 24,63 37,69 — — — — — Ghi chu: * Cac dieu kien phan img tren cac xiic tac gidng nhu cac dieu kien tren cac xiic tac khae nhumg khdng cd hai nude Cac ket qua dugc trinh bay d Bang cho thay kha nang xuc tac tdt cua cac spinen phan iing oxidehydro hda etylbenzen stiren Cac ket qua eiing ehi rang nhiet phan img tang, chuyen hda etylbenzen tang, chgn lge stiren giam Trong khoang nhiet tir 350°C din 450°C, cac spinen NiCrFe04 (I), NiCrFe04 (II), CuCrFe04 (II) (vdi x = 1) cho boat ddng xuc tac va chgn lge stiren cao nhat Trong phan img oxidehydro hda etylbenzen stiren tren cae xuc tac CuCrFe04, vai trd eiia nude rat quan trgng Sy ed mat cua nude da loai dugc eae phan ung phy nhu dealkyl hda etylbenzen benzen va etylen, cracking lien ket C-C cua nhdm etyl phan tu etylbenzen Trong dd cac phan iimg phy xay kha manh cimg vdi phan ling chinh, oxidehydro hda etylbenzen stiren tren cac xiie tac NiCr2.xFex04 (I) va (II) Cd the sy ed mat cua nude gay nen hien tugng hap phy canh tranh can trd cac phan img phu xay Dya tren mdt sd edng bd nhirng nam gan day [10] va eae ket qua dugc trinh bay Bang 5, chung tdi cd the gai thich sy phirc tap cua phan img oxi dehydro hda etylbenzen tren cac xuc tac NiCr2.xFex04 (I) va (II) nhu sau: Dau tien, oxi bi hap phy tren Id trdng cua be mat xuc tac hinh oxi bj hap phy (0„-.): - O + Me'^ 3+ (O:.) + Me Sau dd cac phan iing dom phan tu xay theo co che Langmuir-Hinshelwood dan ien san pham phan img • Qud trinh tdch hidnia tren cdc tdm kim logi Fe^^ hay Cr^* (Me^^): CH3 ^H H Me3+ 02-Me3+02- 3+ o2-Me2+02- Tdng hgp va nghien cdu kha nang xuc tac cua cac oxit kim loai 198 Qud trinh did gdy lien kit C-C: -CH H r 3+02-Me2+02 Me' ]^e3+02-Me2+02- C2H4 CH—CH2- CH2 = Me3+02-Me2+02- C2H4 ^H« + gas Me3+ 02-Me2+02- -CH3 Me3+o2-Me3+o2- * gas Me3+ 02-Me3+02- • Oxi dehidro hda ion cacboni trung gian: • (*H-^CH2—H H^^ -K>.ad H CH2=CH2 + Oad I Me3+ - M e + - Me3+02-Me2+0ret H H / ( ^ \ — C H = CH2+ Me3+ o2- Me2+ ^ + Oad Qud trinh lap lgi: 20H" ^ H + 2-_ Me^^ + 02^Me^^+0;;rf 2- O „g, la Oxi tir mang ludi spinen O "^ la Oxi bi hap phu O day, Me^"^ cd the la Cr^"^ hay Fe^"^ Ca hai cation la eae tam axit Lewis cd kha nang giir nhan phenyl nhu va cd kha nang tach hidrua tuong ty KET LUAN Chung tdi da tdng hgp ba day spinen theo hai phuong phap phan iing d trang thai ran va ddng ket tua Phuong phap ddng ket tua thuan lgi hom vi nhiet cin thilt eho sy tao spinen thap hon Chung tdi da su dyng eae phuomg phap vat ly XRD, IR, SEM, SBET dl kilm tra Tuygn tap bao cao Hgi nghj KHCN "30 nam DSu Vift Nam: Cff hgi mdi, thach thde mdi" 199 cau tnic cac spinen thu dugc Cae ket qua da khang djnh cac san pham thu dugc cd cau tnic spinen Cac spinen cd boat ddng va chgn lge stiren cao phan img oxi dehydro hda etylbenzen stiren dae biet cd mat hoi nude Phan ung oxi dehydro hda etylbenzen tren cac spinen NiCr2.xFex04 (I) va (II) rit phiic tap, ngoai phan ung chinh tao stiren cdn cd cac phan iing phu anh hudng tdi chat lugng stiren TAI LIEU THAM KHAO Cavani F., Trifigo F., 1995 Alternative processes for the production of styrene Appl Catal A: General, 133, 1995, p 219 - 239 Gabr R.M., Girgis et al., 1997 Effect of spinel (ZnCr204) formation on the texture, electrical conduction and catalytic behaviour of the ZnO-Cr20i system Materials Chemistry and Physics, 39, 1994, p 53 - 62 Inui T., Anpo M., Izui K., Yanagida S., Yamaguchi T., 1998 Dehydrogenation of ethylbenzene over iron oxide-based catalyst in the presence of carbon dioxide Studies in surface science and catalysis 114, 1998, p 415 - 418 John Jebarathinam N., Eswaramoorthy M., Krishnasamy V., 1996 Nonoxidative and oxidative dehydrogenation of ethylbenzene over Zn-Fe-Cr tenary spinel system Appl Catal A: General, 145, 1996, p 57 - 74 Kung H.H., Kung M,C., 1997 Oxidative dehydrogenation ofalkanes magnesium-oxides Appl Catal A: General, 157, 1997, p 105 - 116 over vanadium- Lee E.H., 1973 Iron oxide catalysts for dehydrogenation of ethylbenzene in the presence of steam Catalysis reviews, 1973, p 285 - 305 Mihajlova A., Andreev A., Shopor D., et al., 1987 New iron based catalyst for dehydrogenation of ethylbenzene to styrene obtained by decomposition of metal salts in organic solvent Proc.Vl"^ Int Symp Heterogeneous catalysis, Sofia, 1987, Part 2, p - 4 Perrin R., Scharff J.P., 1993 Chimie Industrielle Barcelone-Bom Vol I Masson, Paris-Milan- Tuyen Mai, 2002 Petrochemical and organic industries: Opportunities and challenges Proceedings of the Conference on Refinery and Petrochemical Technology in the XX - XXI century, Hanoi, 20-21 Dee., 2002 10 Thu Hoa Huu, Chau Trinh Ngoc, Due Truong Dinh, 2002 Synthesis of ternary spinels NiCr2-xFe^04 and their catalytic activity in oxidative dehydrogenation of ethylbenzene to styrene Proceedings of the Conference on Refinery and Petrochemical Technology in the XX - XXI century, Hanoi, 20-21 Dee., 2002 ... Xiic tde Trong nhdng nam gan day, cd nhieu cdng trinh cdng bd kha nang xuc tac tdt cua cac oxit kim loai kieu spinen cho phan img dehydro hda etylbenzen stiren [5] Cac oxit kim loai kieu spinen. .. ung oxi dehydro hda etylbenzen stiren THUC NGHIEM \ Dieu che spinen Cd nhieu phuong phap dieu che spinen bae ba Trong bao cao nay, chung tdi sir dyng bai phuomg phap dieu che spinen AB2.xBx''04... toan cae lugmg kim loai oxit theo cdng thue d tren ein phai lay, sau dd can lay lugmg oxit da tinh duge tren can phan tich Trdn cac oxit kim loai cdi su that can than 30 phut eho cae oxit phan tan