Sản xuất vật liệu cacbon nano ống từ LPG

Khoa hoc & Cong nghe<br /> <br /> <br /> <br /> <br /> San xuat vat lieu<br /> cacbon nano ong tft LPG<br /> HUYNH A N H H O A N G , NGUYEN HLTU PHU, NGUYEN D I N H LAM<br /> <br /> hgp chat chira cacbon trong dilu<br /> <br /> N<br /> gay nay, viec tdng hgp cua CNTs (it hoac khdng tao ra<br /> cacbon nano dng kidn Viet Nam va vdi trang thilt cacbon vd djnh hinh), dd Id nhiet<br /> (CNTs) hay sgi (CNFs) bj hien cd ciia phdng thi nghiem, do tdng hgp, ndng dp LPG (%) va<br /> ngudi ta sii dung nhieu phuong chung tdi lya chpn phirong phap van td'c ddng khi hdn hgp di qua<br /> phap khac nhau nhu phuong phap nghien ciru CVD dl tao ra CNTs thiet bi (cm/pbiit). De tao ra CNTs<br /> cdt gpt bdng tia laser, phuong vdi ngudn cacbon la khi hda long chiing tdi siir dung mdt sd nguydn<br /> phdp hd quang, phuang phap hda LPG thudng dung trong sinh boat vat lidu, thilt bj chinh sau: binh<br /> udt, phuang phap ca hpc, phuang gia dinh va xuc tac dugc lya chgn khi LPG, loai 13kg, ap sudt LPG<br /> phap kit ty hda hpc (CVD),.. Tiiy la Fe/3 -A1203. Thanh phdn 5.5kg/cm2; binh khi H2, loai 47kg,<br /> theo timg dieu kien nghien ciiu cacbon (C%) trong LPG phu ap suat H2 200 kg/cm2; binh khi<br /> cQng nhu linh vyc irng dyng ma thude vao nha san xua't cung nhu N2, loai 47kg, ap sudt 200 kg/cm2;<br /> viec lya chpn phuang phap cung cdc nha kinh doanh dja phuang, xiic tac 17%Fe/3 -A1203. Hd thd'ng<br /> se khac nhau. Xu hudng tuang lai thdng thudng thdnh phdn cQa Id nung kieu dng vdi vung nhidt<br /> ngudi ta sii dung phuong phap chiing la 50% butan, 50% propan dd lam viee tir 0-lOOOoC, thilt bj<br /> CVD dl tdng hgp cacbon nano hoac 70% butan, 30% propan. dilu khien luu lugng ddng vd dilu<br /> vdi ngudn cacbon re tiln, dl tim Qua nghien ciru ly thuylt [1], khiln va hien thj nhiet dp ty ddng<br /> kilm va cho chi phi thap nhat. [3] va thyc nghidm cho thay ed va mdt sd trang thilt bj khde.<br /> Tiip theo nOi dung bdi bao [2] nhieu ylu td anh hudng din san - Sg do tdng hgp CNTs: So<br /> ma chiing tdi da dl xuat quy trinh pham CNTs tao ra nhung 3 yeu to dd nguydn ly va hinh anh cua he<br /> tdng hgp cacbon nano bdng sau day anh hudng din san lugng thdng tdng hgp CNT dugc trinh<br /> phuang phap phan hiiy xiic tac cae tao thanh cung nhu tinh dn djnh bay tren hinh 1.<br /> <br /> <br /> <br /> <br /> CopyngH® HAH 2010<br /> <br /> <br /> <br /> <br /> Hmh J-So do tdng hop cacbon nano ong bdng LPG- FeP -AI203<br /> <br /> - Md ta qua trinh tdng hop 7400C. Sau 2 gid tdng hgp, CNTs nghidm khao sat Id it nhdt md van<br /> [2]: Lay 0,2g xuc tac FeP -A1203 hinh thanh se dugc lam ngudi rdi xac djnh dugc cac dilu kidn tdi uu<br /> cho vao thuyin sii va dat vao giua dem di can d nhiet do phdng va nhdm tao ra lugng san pham<br /> tam Id nung, sau khi khir xuc tae d ghi lai tirng gia trj CNTs tao thanh CNTs ldn nhat, thdng thudng ta sii<br /> nhiet do thich hgp, cho LPG qua dl phuc vu eho vide qui hoach dung bai loan qui hoach thyc<br /> thie't bi dam bao van td'c ddng khi thyc nghidm va tinh todn tdi uu nghiem [4], xdc djnh dugc phuang<br /> dn djnh, nhidt dp tdng hgp 650- cdc thdng sd tdng hgp. Dl so thi trinh hdi qui dang tuydn tinh hoac<br /> <br /> 36 Khoa hoc<br /> &phdt trien<br />  Khoa hoc & Cong nghe<br /> <br /> <br /> <br /> <br /> ]<br /> '^•^<br /> <br /> • ^<br /> <br /> <br /> <br /> <br /> EMLab-NIHE M2: 670 °C HV: 80 KV DM:25a00x<br /> Hlnh 2 - Anh TEM mdu CNTs<br /> <br /> <br /> phi tuyIn, tu dd ta xac djnh dugc (Transmission Electron vide tao ra CNTs cd dd ddng<br /> gia trj td'i uu cho van hanh thi Microscopy - TEM) dd'i vdi cac nha't va tinh khiet cao theo<br /> nghiem vdi ham muc tieu la td'i da mau cacbon nano thu dugc d cac phuang phap CVD vdi ngudn<br /> lugng CNTs tao thanh. chi dp nhiet dO khac nhau cho nguyen lieu LPG, mdt ngudn<br /> Trong qua trinh khao sat, phan thay cacbon nano hlnh thanh la nguydn lieu dl nghien cuu hdu<br /> tich sd lidu va tinh toan td'i uu cacbon nano dang dng, cd tinh dn nhu rat hie'm dugc cdng bd trdn<br /> chiing tdi sir dung phdn mim dinh cao, khdng cd cacbon vd djnh cac tap chi chuydn nganh cQa cdc<br /> thd'ng ke STATISTICA 7 va hinh d vung nhidt dp tir 650- nudc, cQng nhu tai Viet Nam. 6<br /> Solver - MS Excel. Kit qua tdng 710^0, vdi dudng kinh ngoai ciia qui md phdng thi nghidm chiing<br /> hgp CNTs dat ldn nhdt khi cdc CNTs tir 10-13nm. Bl mat ridng tdi da tao ra dugc cacbon nano<br /> ndng dd LPG Id 31%, van td'c cua mdu CNTs do dugc tinh theo dng tir nguydn lidu trong nudc,<br /> ddng la 3,2 cm/phut va nhidt dd la ly thuylt BET la 190-200m2/g. mot khi da lam chii dugc cdng<br /> 7100C. Kit qua ciia bai bao nay la nghe san xuat thi viec irng dung<br /> Kit qua nghidn cuu tren kinh mdt trong nhung cdng trinh vat lieu CNTs vao ddi sd'ng se<br /> hiin vi dien tir truyin qua nghidn cuu cua nhdm tac gia vl rat phong phii va da dang. •<br /> <br /> <br /> Tai lieu tham khao<br /> [1]. G. Gulino et al. C2H6 as an active carbon source for a large scale synthesis/ Applied Catalysis A:<br /> General 279 (2005) 89-97.<br /> [2]. Huynh Anh Hodng, Nguyin Dinh Ldm. Nghien ciru cte xudt quy trinh tdng hap carbon nano bdng<br /> phuang phdp phdn huy xdc tdc cdc hop chdt chira carbon trong dieu kien Viet Nam, Tap chi Khoa hoc vd<br /> Phdt trien - Sd KH&CN Dd Ndng, J12 (2005) 20.<br /> [3]. Huynh Anh Hodng, Nguyin Dinh L.dm. Ca sd ly thuyet ciia viec lira chon xiic tdc cho qud trinh tdng<br /> hap vdt lieu nano carbon dang dng vd sai bang phuang phdp ket tu hoa hoc trong pha hoi. Tap chi Khoa hoc<br /> vd Phdt trien - Sd KH&CN Dd Nang, 2009.<br /> 14]. Nguyin Thi Lan. Qui hoach thuc nghiem- Nghien ciai vd img dung. Dd Ndng, 2007.<br /> <br /> <br /> Khoa hoc 37<br /> &phat trien<br />