本文選題：中空纖維膜 + 離子-電子雙相混合導(dǎo)體�。� 參考：《山東理工大學(xué)》2017年碩士論文

【摘要】：混合導(dǎo)體陶瓷透氧膜因其具有100%的氧離子選擇性,在純氧制備、富氧燃燒以及甲烷與乙烯、乙烷的氧化耦合反應(yīng)等領(lǐng)域具有良好的應(yīng)用前景。但由于傳統(tǒng)的鈣鈦礦型混合導(dǎo)體陶瓷透氧膜在CO_2和還原氣氛中不穩(wěn)定而限制了應(yīng)用。本論文,將構(gòu)建一種由50wt%Pr0.1Gd0.1Ce0.8O_2-δ-50wt%CoFe2O4(50PGCO-50CFO)組成的新型雙相中空纖維膜,并用鈣鈦礦結(jié)構(gòu)的Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)陶瓷氧滲透材料進行修飾,研究透氧性能及穩(wěn)定性能,以期提高其耐二氧化碳性能。首先,采用一鍋法合成50PGCO-50CFO雙相粉體,通過XRD、XPS、TEM等測試手段,發(fā)現(xiàn)一鍋法制備的粉體均勻分布,離子導(dǎo)體和電子導(dǎo)體可形成連續(xù)的傳輸網(wǎng)絡(luò)。其次,基于相轉(zhuǎn)化-燒結(jié)技術(shù)制備50PGCO-50CFO致密中空纖維膜。在1000℃,使用氦作為吹掃氣時,透氧速率可以達(dá)到0.54mL·min-1·cm-2;用純CO_2在950℃吹掃時,透氧速率為0.40mL·min-1·cm-2,且連續(xù)運行200h透氧量沒有明顯的降低,膜也沒有出現(xiàn)惡化現(xiàn)象,表現(xiàn)出了良好的耐二氧化碳性能。為提高透氧性,我們又通過溶膠-凝膠法制備了BSCF粉體,用以修飾雙相50PGCO-50CFO中空纖維膜。用相轉(zhuǎn)化-燒結(jié)技術(shù)制備的BSCF透氧膜,在1000℃,使用氦作為吹掃氣時,透氧速率可以達(dá)到6.88mL·min-1·cm-2;用純CO_2在950℃吹掃時,透氧量在前40h,透氧速率由2.72mL·min-1·cm-2降到1.79mL·min-1·cm-2。BSCF的透氧速率雖然高于PGCO-CFO雙相膜,然而在CO_2氣氛中極不穩(wěn)定,透氧速率急劇下降,甚至為0。將高透量的BSCF混合導(dǎo)體涂覆在雙相透氧膜的表面,明顯增加了氧滲透膜的三相界面,因而在相同測試條件下,雙相膜的透氧速率提高了60%。
[Abstract]:Because of its 100% oxygen ion selectivity, mixed conductor ceramic permeable membrane has a good prospect in the fields of pure oxygen preparation, oxygen-enriched combustion and the oxidative coupling reaction of methane with ethylene and ethane. However, the application of traditional perovskite-type mixed conductor ceramic oxygen permeable membrane is limited due to the instability in COST2 and reduction atmosphere. In this thesis, a novel biphasic hollow fiber membrane consisting of 50 wtPr0.1Gd0.1Ce0.8O2- 未 -50wtCoFe2O4 / 50PGCO-50CFO) was constructed and modified with perovskite Ba0.5Sr0.5Co0.8Fe0.2O3- 未 BSCF-based ceramic oxygen permeable material to study its oxygen permeability and stability, in order to improve its carbon dioxide resistance. Firstly, 50PGCO-50CFO duplex powder was synthesized by one-pot method. By means of XRDX XPS TEM, it was found that the powder prepared by one-pot method was uniformly distributed and the ionic and electronic conductors could form a continuous transmission network. Secondly, 50 PGCO-50 CFO dense hollow fiber membrane was prepared based on phase conversion-sintering technology. At 1000 鈩，

本文編號：1996881