Study Of The Surface Modified Zirconium Membrane And Its Performance Of Hydrogen Permeation

Membrane separation technology is widely aPPlied tO industrial fields such asWatr trCwtnt, biological Pharmacy, chemical Prodwtion, and exPerimentaanaysis. TO deal with gas separaion at high Pressure and high temperature, inoghcmembranes are used widely In the ligh of the produCtion and the uitrahigh purity ofhydrogen isOtOpe requlred by some special professions and the defects of the currenteInPOyed membranes seParation technology the PreParation teehnology of highH-Permselective membrane. based on the high hydrOgen permeability of severalrefractory metals such as zirconium, niObdri and anlum, was PreselltCd. The oxidefilm of zirconium on the sdses conceals its high hydrogen Permeability because ofits self passiVe effect with oxygCn, Which limits its aPplication as highH-Permse1ective membran. For this reason, the author brough fOrth new ideas instuding these subStane as fOllowing'The method of electrOchemistry Which wa firstly studed me used to removthe oxide film of zirconium on the sndces. The zirconium film withoul zirconia wasprePared and the removing technology of the zirconia on the zirconium suthees wasNned.The method of high temPeratUr vacuum hydrOgenization Which was firstlystudied was used tO remove the okide film of zirconium on the sdses. Thezircondri filIn wtut rirconia wa PrePared and the removing technOlogy of thezirconia on the zirconium sdrices was obtalned.The methods of chemistry and magnetrOn sPUttring plating were used in orderto platC a palladium film, which is characteristic of self catalysis for hydrogen andthe sole H-permselectivity on the clean rirconium sdrices prePared by the methodsof electrochemitw and(or) high temperatUr vacuum hydrgeniZation, Which wasfirstly stUdied. The plating tedrilogy was Obained and the surface modifiedzirconium membran was Prepared.The PrePared sdse modified zirconum meInbrane was tested at the widerrange of tCmperaure and Pressure and differellt comPOsihons of hydrogen mixturCgases(i.e. different hydrgen pAnal Pressure) in order tO examine the PerfOrmance ofthis membrane and the sole HPermselechvity of the membrane. The results showedtha the Purity of the permeated hydrgen is l00% at the base of the detectiongreatest lower lAnit of the QHle Mass SPectrOmeter, and there was no imPuritygas passed, the Permeating flux and Permeability of this membrane are frOm severaldecades times to one decade times more higher than tha of a palladum membran inthe range of from 593K to 773K, Puv=0.2~0.3MPa, Pdn=4X l04Pa--0.lMPa, thehydrogen Permeatng flux is increased with the difference of the sqUto root ofpressure, and Presents a linear relationshiP, the Pressure seems has no influence onthe Permeablity, the Permeabi1ity is decreased with the increasing of the temperature,and Presents an exponential relationshiP, accOndng to the fitting curve of therelationship betWen the Permeability and the temPeratUr derived frOm theexperimenta daa, in the range of 593K~773K, PUP0.2~0.3MPa, Pha=4 X l0#Pa~0. lMPa, the relationship is fdi = l 55xl0-' e47jL T )in this range, the relative error of the hydrgen Permeabilty bbeen theexperimental values and the fOrmula values are less than 3%, the durability testshowed that after the cycle exPeriments of PrCssure and tempebe fOr 30 days, theperfrmance of the membran did not change, at last, the theory of hydrogenPermeaton was discussed, too.ThrOugh this work, the Pfepared surf ases modified zirconium memran cansatisfy the requirement of the purity and the permeating fiux of hydrOgen isOtoPe gas.The develoPed technology of zirconium sdses modified POssesses theorehcalimportance and potentially apPlicable PrOspect and market Prospect.