期刊文献+
共找到111篇文章
< 1 2 6 >
每页显示 20 50 100
Partial oxidation of methane to syngas in a mixed-conducting oxygen permeable membrane reactor 被引量:3
1
作者 Hui Dong Guoxing Xiong +2 位作者 Zongping Shao Shenglin Liu Weishen Yang 《Chinese Science Bulletin》 SCIE EI CAS 2000年第3期224-226,共3页
Mixed-conducting oxygen permeable membranes represent a class of novel ceramic membranes, which exhibit mixed oxygen ionic and electronic conductivities. At high temperatures, oxygen can permeate through the membrane ... Mixed-conducting oxygen permeable membranes represent a class of novel ceramic membranes, which exhibit mixed oxygen ionic and electronic conductivities. At high temperatures, oxygen can permeate through the membrane from the high to low oxygen pressure side under an oxygen concentration gradient. Theoretically, the permselectivity of oxygen is 100%. Recently, anovel mixed-conducting membrane-Ba0.5Sr0.5Coo.8Feo.2O3-δ has been developed, which showsextremely high oxygen permeability and promising stability. Furthermore, the reactor made with such membranes was successfully applied to the partial oxidation of methane to syngas reaction using air as the oxygen source, which realized the coupling of the separation of oxygen from air and the partial oxidation of membrane reaction in one process. At 850℃, methane conversion 】 88%, CO selectivity 】97% and oxygen permeation rate of about 7.8 mL/(cm2 ·min) were obtained. 展开更多
关键词 mixed-conducting oxygen permeable membrane perovskite membrane reactor partial oxidation of methane catalysis in membrane reactor.
原文传递
Perovskite-type oxygen-permeable membrane BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) for partial oxidation of methane in coke oven gas to hydrogen 被引量:2
2
作者 ZHANG Yuwen LIU Jiao LIU Yong DING Weizhong LU Xionggang 《Rare Metals》 SCIE EI CAS CSCD 2010年第3期231-237,共7页
Perovskite-type oxygen-permeable membrane reactors of BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) packed with Ru-based catalyst had high oxygen permeability and could be used for hydrogen production by partial oxidation of metha... Perovskite-type oxygen-permeable membrane reactors of BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) packed with Ru-based catalyst had high oxygen permeability and could be used for hydrogen production by partial oxidation of methane in coke oven gas (COG). At 1173 K, 94% of methane conversion, 85% of H2 selectivity, 107% of CO selectivity, and as high as 15.4 mL·cm^-2·min^-1 of oxygen permeation flux were obtained. The BCFNO membrane itself had poor catalytic activity to partial oxidation of CH4 in COG. During continuous operation for 70 h at 1173 K, no degradation of the membrane reaction performance was observed. XRD and SEM characterization also demonstrated that the BCFNO membrane reactor exhibited good stability in partial oxidation of methane in COG. 展开更多
关键词 hydrogen production coke oven gas methane conversion oxygen permeation oxygen-permeable membrane
下载PDF
Performance of a tubular oxygen-permeable membrane reactor for partial oxidation of CH_4 in coke oven gas to syngas 被引量:2
3
作者 Yuwen Zhang Hongwei Cheng Jiao Liu Weizhong Ding 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第3期280-283,共4页
A gas-tight BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ(BCFNO) tubular membrane was fabricated by hot pressure casting.And a membrane reactor with BCFNO tubular membrane and Ag-based sealant was readily constructed and applied to... A gas-tight BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ(BCFNO) tubular membrane was fabricated by hot pressure casting.And a membrane reactor with BCFNO tubular membrane and Ag-based sealant was readily constructed and applied to partial oxidation of CH4 in coke oven gas.At 875 ℃,95% of methane conversion,91% of H 2 and as high as 10 ml cm-2·min-1 of oxygen permeation flux were obtained.There was a good match in the coefficient of thermal expansion between Ag-based alloy and BCFNO membrane materials.The tubular BCFNO membrane reactor packed with Ni-based catalysts exhibited not only high activity but also good stability in hydrogen-enriched coke oven gas(COG) atmosphere. 展开更多
关键词 tubular oxygen-permeable membrane reactor partial oxidation coke oven gas hydrogen production
下载PDF
A Comparative Study of the Performance of Symmetric and Asymmetric Mixed-conducting Membranes 被引量:1
4
作者 常先锋 张春 +3 位作者 何艳君 董学良 金万勤 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第4期562-570,共9页
According to the configuration,mixed-conducting membranes are classified as symmetric membranes and asymmetric membranes consisting of a thin dense layer and a porous support.In this study,these two kinds of SrCo0.4Fe... According to the configuration,mixed-conducting membranes are classified as symmetric membranes and asymmetric membranes consisting of a thin dense layer and a porous support.In this study,these two kinds of SrCo0.4Fe0.5Zr0.1O3-δ oxide-based membranes were systematically compared in terms of oxygen permeability and chemical stability,and their differences were elucidated by means of the theoretical calculation.For the oxygen permeability,the asymmetric membrane was greater than the symmetric membrane due to the significant decrease of bulk diffusion resistance in the thin dense layer of the asymmetric membrane.In regard to the chemical stability,the increase of oxygen partial pressure on the asymmetric membrane surface at CH4 side produced the stable time of over 1032h in partial oxidation of methane at 1123K,while the symmetric membrane was only of 528h.This study demonstrated that the asymmetric membrane was a promising geometrical configuration for the practical application. 展开更多
关键词 comparison mixed-conducting oxide symmetric membrane asymmetric membrane oxygen perme- ability chemical stability
下载PDF
Oxygen permeability and CO_2-tolerance of Ce_(0.8)Gd_(0.2)O_(2-δ)-Ln BaCo_2O_(5+δ) dual-phase membranes 被引量:4
5
作者 Longfei Luo Hongwei Cheng +2 位作者 Guangshi Li Xionggang Lu Bo Jiang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第1期15-22,共8页
A series of oxygen permeable dual-phase composite oxides 60 wt% Ce0.8Gd0.2O2-δ-40 wt% LnBaCo2O5+δ (CGO-LBCO, Ln = La, Pr, Nd, Sin, Gd and Y) were synthesized through a sol-gel route and effects of the Ln3+ catio... A series of oxygen permeable dual-phase composite oxides 60 wt% Ce0.8Gd0.2O2-δ-40 wt% LnBaCo2O5+δ (CGO-LBCO, Ln = La, Pr, Nd, Sin, Gd and Y) were synthesized through a sol-gel route and effects of the Ln3+ cations on their phase structure, oxygen permeability and chemical stability against CO2 were investigated systemically by XRD, SEM, TG-DSC and oxygen permeation experiments. XRD patterns reveal that the larger Ln3+ cations (La3+, Pr3+ and Nd3+) successfully stabilized the double-layered perovskite structure of sintered LBCO, while the smaller ones (Sm3+, Gd3+, and Y3+) resulted in the partial decomposition of LBCO with some impurities formed. CGO-PBCO yields the highest oxygen permeation flux, reaching 2.8× 10^-7 mol.s-1.cm-2 at 925 ℃ with 1 mm thickness under air/He gradient. The TG-DSC profiles in 20 mol% CO2/N2 and oxygen permeability experiments with CO2 as sweep gas show that CGO-YBCO demonstrates the best chemical stability against CO2, possibly due to its minimum basicity. The stable oxygen permeation flux of CGO-YBCO under CO2 atmosphere reveals its potential application in the oxy-fuel combustion route for CO2 capture. 展开更多
关键词 oxygen permeability dual-phase membrane FLUORITE double-layered perovskite chemical stability C02 capture
下载PDF
Effect of dopant valence on the oxygen desorption and oxygen permeability of SrCo_(0.4)Fe_(0.5)M_(0.1)O_(3-δ)(M=Ni, Al and Zr) mixed-conducting oxides
6
作者 Yan Jun He Xian Feng Chang Xue Liang Dong Chun Zhang Wan Qin Jin Nan Ping Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第6期725-729,共5页
The effect of dopant valence on oxygen desorption and oxygen permeability of SrCo0.4Fe0.5M0.1O3-δ (M = Ni, Al and Zr) mixed-conducting oxides were investigated in detail by O2-TPD and oxygen permeation measurement.... The effect of dopant valence on oxygen desorption and oxygen permeability of SrCo0.4Fe0.5M0.1O3-δ (M = Ni, Al and Zr) mixed-conducting oxides were investigated in detail by O2-TPD and oxygen permeation measurement. The SrCo0.4Fe0.5M0.1O3-δ for M = Fe, Ni, Al and Zr were denoted as SCF, SCFN, SCFA and SCFZ, respectively. O2-TPD analysis revealed that the amount of α oxygen desorption decreased with increasing the valance of doped metal elements (SCFN 〉 SCFA SCF 〉 SCFZ). The oxygen permeation flux at the temperature ≈igher than 1148 K decreased in the order of SCFN 〉 SCF 〉 SCFZ 〉 SCFA. Single activation for oxygen permeation was observed for SCFZ oxide and the activation energies of SCF and SCFA change at around 1073 K, while the change temoerature of SCFN was about 1173 K. 展开更多
关键词 VALENCE mixed-conducting oxide oxygen desorption oxygen permeability
下载PDF
Partial oxidation of simulated hot coke oven gas to syngas over Ru-Ni/Mg(Al)O catalyst in a ceramic membrane reactor 被引量:4
7
作者 Hongwei Cheng Xionggang Lu Xu Liu Yuwen Zhang Weizhong Ding 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2009年第4期467-473,共7页
Hydrogen amplification from simulated hot coke oven gas (HCOG) was investigated in a BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) membrane reactor combined with a Ru-Ni/Mg(Al)O catalyst by the partial oxidation of hydrocarbon... Hydrogen amplification from simulated hot coke oven gas (HCOG) was investigated in a BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) membrane reactor combined with a Ru-Ni/Mg(Al)O catalyst by the partial oxidation of hydrocarbon compounds under atmospheric pressure. Under optimized reaction conditions, the dense oxygen permeable membrane had an oxygen permeation flux around 13.3 ml/(cm^2·min). By reforming of the toluene and methane, the amount of H2 in the reaction effluent gas was about 2 times more than that of original H2 in simulated HCOG. The Rn-Ni/Mg(Al)O catalyst used in the membrane reactor possessed good catalytic activity and resistance to coking. After the activity test, a small amount of whisker carbon was observed on the used catalyst, and most of them could be removed in the hydrogen-rich atmosphere, implying that the carbon deposition formed on the catalyst might be a reversible process. 展开更多
关键词 hydrogen production coke oven gas TAR TOLUENE HYDROTALCITE mixed-conducting oxygen-permeable membrane reactor
下载PDF
光热驱动的膜分离生物甲烷制氢过程建模与仿真分析
8
作者 王沛 段睿明 +1 位作者 张广儒 金万勤 《化工学报》 EI CSCD 北大核心 2024年第3期967-973,共7页
光热驱动的甲烷重整制氢技术,是将太阳能转化为燃料的主要技术路径之一。引入聚光集热技术,可实现太阳能的全光谱利用,有效提高太阳能到燃料化学能的转化效率,同时显著降低系统能耗及碳排放。将多孔碳化硅吸热体和La_(1-x)Sr_(x)Co_(1-y... 光热驱动的甲烷重整制氢技术,是将太阳能转化为燃料的主要技术路径之一。引入聚光集热技术,可实现太阳能的全光谱利用,有效提高太阳能到燃料化学能的转化效率,同时显著降低系统能耗及碳排放。将多孔碳化硅吸热体和La_(1-x)Sr_(x)Co_(1-y)Fe_(y)O_(3-δ)钙钛矿透氧膜结合,提出一种光热驱动的膜反应制氢的设计思路,实现了连续、高效的制氢过程。完成了该反应过程的概念设计,建立考虑辐射-传热-膜分离-反应的数值模型并进行仿真模拟;重点评估了膜表面的温度均匀性,并分析温度对膜内反应及出口产物的影响规律。结果表明,该模型可以有效精准描述概念设计过程。研究成果可为光热驱动的高温膜反应器设计和放大提供理论依据以及初步设计方法。 展开更多
关键词 动态建模 动态仿真 太阳能 甲烷部分氧化 制氢 透氧膜 概念设计
下载PDF
纳米微晶纤维素复合膜的制备及性能分析
9
作者 柴翠元 《韶关学院学报》 2024年第3期6-11,共6页
以具有可持续性和环保特点的棉纤维为原料制备纳米微晶纤维素(NCC),再通过硫酸水解法简单高效地制得NCC悬浮液,将该悬浮液与壳聚糖混合,制备出NCC复合膜.利用万能试验机测试NCC复合膜的力学拉伸性能,同时用拟杯子法测试NCC复合膜的透湿... 以具有可持续性和环保特点的棉纤维为原料制备纳米微晶纤维素(NCC),再通过硫酸水解法简单高效地制得NCC悬浮液,将该悬浮液与壳聚糖混合,制备出NCC复合膜.利用万能试验机测试NCC复合膜的力学拉伸性能,同时用拟杯子法测试NCC复合膜的透湿性、用覆盖油脂的过氧化值测试NCC复合膜的阻氧性、用分光光度计测试NCC复合膜的透光性、用金黄色葡萄球菌和大肠杆菌测试NCC复合膜的抗菌性,最后用细胞培养试验评估复合膜对人体细胞的毒性.结果表明,NCC用量在45%质量分数时,制备的NCC复合膜拉伸强度最大、力学性能最高、断裂界面更粗糙;NCC复合膜水蒸气透过率保持在2.8×10^(-11) g·(m·s·Pa)^(-1)以上;NCC复合膜氧气阻隔性的过氧化值在2.0以上;经过与NCC复合膜32 min的接触,金黄色葡萄球菌和大肠杆菌接近完全被杀灭;24 h人体细胞存活率在70%以上.综上,所制备的NCC复合膜性能优良,值得开发. 展开更多
关键词 纳米微晶 纤维素 复合膜 透湿性 阻氧性 透光性 抗菌性
下载PDF
O_(2)/N_(2)选择性渗透膜分子设计的进展
10
作者 蘧延庆 谷桐 +3 位作者 查雨欣 刘洋 贾宏葛 杜小雨 《塑料》 CAS CSCD 北大核心 2024年第5期91-97,共7页
在基础研究及工业应用中,O_(2)/N_(2)选择性渗透膜具有重要的作用,但是,目前尚未发挥其潜力。由于有机聚合物可以通过精确的分子设计并制备较薄且面积较大的自支撑膜,成为研究的热点。但是,由于O_(2)及N_(2)分子性质的差异较小,分离膜... 在基础研究及工业应用中,O_(2)/N_(2)选择性渗透膜具有重要的作用,但是,目前尚未发挥其潜力。由于有机聚合物可以通过精确的分子设计并制备较薄且面积较大的自支撑膜,成为研究的热点。但是,由于O_(2)及N_(2)分子性质的差异较小,分离膜的分子结构需进行精确的设计。为了得到合适的大分子结构,从而制备性能较好的O_(2)/N_(2)分离膜,综述了纯聚合物对称致密膜的O_(2)/N_(2)透过数据。然后,通过对比聚合物的老化性能,分析得到性能较好的聚合物膜的分子结构。同时通过对比近十余年文献报道的最佳O_(2)/N_(2)分离性能的聚合物膜,分析了该领域中分子结构设计的研究进展。 展开更多
关键词 分子结构设计 O_(2)/N_(2) 聚合物膜 分离上限 透氧性 选择性
下载PDF
Fluorite Ce_(0.8)Sm_(0.2)O_(2-δ) porous layer coating to enhance the oxygen permeation behavior of a BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) mixed conductor 被引量:1
11
作者 Tai-he Wang Wei-jia Song +1 位作者 Rong Li Qiang Zhen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第6期698-703,共6页
Fluorite Ce0.8Sm0.2O2-δ(SDC) nanopowder with a crystallite size of 15 nm was synthesized by a co-precipitation method. An SDC porous layer was coated onto a BaCo0.7Fe0.2Nb0.1O3-δ(BCFN) mixed conductor to improve... Fluorite Ce0.8Sm0.2O2-δ(SDC) nanopowder with a crystallite size of 15 nm was synthesized by a co-precipitation method. An SDC porous layer was coated onto a BaCo0.7Fe0.2Nb0.1O3-δ(BCFN) mixed conductor to improve its oxygen transport behavior. The results show that the SDC-coated BCFN membrane exhibits a remarkably higher oxygen permeation flux(JO2) than the uncoated BCFN in the partial oxidation of coke oven gas(COG). The maximum JO2 value of the SDC-coated BCFN is 18.28 mL ·min^-1·cm^-2 under a COG/air flux of 177 mL ·min^-1/353 mL ·min^-1 at 875℃ when the thickness of the BCFN membrane is 1 mm; this JO2 value is 23% higher than that of the uncoated BCFN membrane. This enhancement is likely because of the higher oxygen ionic conductivity of SDC, which supplies oxygen vacancies and accelerates oxygen exchange on the membrane/coating layer/gas three-phase boundary. 展开更多
关键词 chemical stability surface coating oxygen permeable membrane coke oven gas
下载PDF
壳聚糖处理对采后脐橙活性氧代谢和细胞膜透性的影响 被引量:1
12
作者 曾玲珍 邓礼艳 +2 位作者 林育钊 林河通 林艺芬 《中国食品学报》 EI CAS CSCD 北大核心 2023年第5期291-300,共10页
为了开发一种提高采后脐橙果实耐贮性的安全、简便、低成本保鲜技术,阐明其可能的作用机理,将采后“纽荷尔”脐橙果实用壳聚糖(稀释800倍的卡多赞)浸泡5 min(以清水浸泡5 min为对照)并在相对湿度85%和温度(18±1)℃下贮藏,研究壳聚... 为了开发一种提高采后脐橙果实耐贮性的安全、简便、低成本保鲜技术,阐明其可能的作用机理,将采后“纽荷尔”脐橙果实用壳聚糖(稀释800倍的卡多赞)浸泡5 min(以清水浸泡5 min为对照)并在相对湿度85%和温度(18±1)℃下贮藏,研究壳聚糖处理对脐橙果实贮藏期间活性氧代谢和细胞膜透性的影响。结果显示:与对照果实比较,壳聚糖处理能较好地保持“纽荷尔”脐橙果实的外观品质,有效减少果实腐烂,抑制脐橙细胞膜透性、超氧阴离子自由基、过氧化氢和丙二醛含量的上升,保持较高的超氧化物歧化酶、抗坏血酸过氧化物酶和过氧化氢酶活性,较高的还原型谷胱甘肽和还原型抗坏血酸含量及较高的还原能力和1,1-二苯基-2-三硝基苯肼自由基清除能力。结论:壳聚糖(稀释800倍的卡多赞)处理增强了采后“纽荷尔”脐橙果实耐贮性,与壳聚糖处理增强脐橙果实的活性氧清除能力,降低活性氧和丙二醛的产生与积累,减轻膜脂过氧化作用及较好地保持其细胞膜结构有关。 展开更多
关键词 “纽荷尔”脐橙 壳聚糖 活性氧代谢 细胞膜透性 耐贮性
下载PDF
低温等离子体在不同时间条件下对黄曲霉孢子灭活作用的研究 被引量:2
13
作者 郁明明 谢岩黎 《河南工业大学学报(自然科学版)》 CAS 北大核心 2023年第2期49-55,共7页
黄曲霉孢子能抵抗食品灭菌处理,并产生对动物和人类有毒的黄曲霉毒素。探索在不影响食品品质的条件下使孢子失活,降低真菌毒素污染造成的风险。利用介质阻挡放电产生低温等离子体装置在不同时间(30、60、90 s)条件下处理黄曲霉孢子,研... 黄曲霉孢子能抵抗食品灭菌处理,并产生对动物和人类有毒的黄曲霉毒素。探索在不影响食品品质的条件下使孢子失活,降低真菌毒素污染造成的风险。利用介质阻挡放电产生低温等离子体装置在不同时间(30、60、90 s)条件下处理黄曲霉孢子,研究等离子体对细胞膜完整性和通透性的影响,进行了SEM、细胞内容物含量测定、胞外电导率及细胞外pH值的测定试验。结果表明:黄曲霉孢子在处理30、60、90 s后显示出孢子停止萌发的现象;扫描电镜显示,随着处理时间从30 s延长至90 s,孢子表面发生变形,皱缩更加严重;黄曲霉孢子经等离子体处理30、60、90 s后出现内容物泄漏、pH值下降、电导率上升等现象,细胞膜发生损伤,通透性增加。此外,通过荧光显微镜和荧光分光光度计的分析证实了处理后的黄曲霉菌胞内产生了大量活性氧(ROS),说明等离子体处理造成了黄曲霉的氧化损伤,导致ROS在细胞内积累,这是黄曲霉孢子失活的主要因素之一。总之,介质阻挡放电低温等离子体处理可以在数分钟内使真菌孢子失活。 展开更多
关键词 黄曲霉 低温等离子体 孢子灭活 细胞膜通透性 活性氧
下载PDF
膜氧合器用PEEK中空纤维膜的孔结构调控及性能研究
14
作者 秦湘普 张圣昌 +2 位作者 李博 廉婷婷 刘鹏清 《合成纤维工业》 CAS 2023年第5期17-23,共7页
以聚醚醚酮(PEEK)为基体材料、聚醚酰亚胺(PEI)为致孔剂,采用共混熔融纺丝法和热致相分离法制备膜氧合器用PEEK中空纤维膜,研究了PEEK/PEI质量比、水冷温度、退火温度及萃取剂种类对PEEK中空纤维膜孔结构的影响,并对PEEK中空纤维膜的力... 以聚醚醚酮(PEEK)为基体材料、聚醚酰亚胺(PEI)为致孔剂,采用共混熔融纺丝法和热致相分离法制备膜氧合器用PEEK中空纤维膜,研究了PEEK/PEI质量比、水冷温度、退火温度及萃取剂种类对PEEK中空纤维膜孔结构的影响,并对PEEK中空纤维膜的力学性能和气体渗透性进行了表征。结果表明:当PEEK/PEI质量比为4/6、水冷温度为20℃、退火温度为250℃并采用反应型萃取剂时,所得PEEK中空纤维膜具有内层多孔、外层相对致密的膜结构,其平均孔径为21 nm、比表面积为134 m^(2)/g、孔容为0.71 cm^(3)/g;与商用聚甲基戊烯(PMP)中空纤维膜相比,PEEK中空纤维膜具有相似的孔形貌、更高的比表面积与孔容;PEEK中空纤维膜具有较好的力学性能和气体渗透性,断裂强度和气通量分别达0.327 cN/dtex和33.46 mL/(cm^(2)·min·bar),基本满足膜氧合器的性能要求。 展开更多
关键词 聚醚醚酮纤维 中空纤维膜 膜氧合器 热致相分离 孔结构 气体渗透性
下载PDF
Partial oxidation of methane to syngas in tubular oxygen-permeable reactor 被引量:5
15
作者 Wang Haihui Cong You Yang Weishen 《Chinese Science Bulletin》 SCIE EI CAS 2002年第7期534-537,共4页
A dense Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane tube was prepared by the extruding method. Furthermore, a membrane reactor with this tubular membrane was successfully applied to partial oxidation of methane (POM) reaction,... A dense Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane tube was prepared by the extruding method. Furthermore, a membrane reactor with this tubular membrane was successfully applied to partial oxidation of methane (POM) reaction, in which the separation of oxygen from air and the partial oxidation of methane are integrated in one process. At 875°C, 94% of methane conversion, 98% of CO selectivity, 95% of H2 selectivity, and as high as 8.8 mL/(min·cm2) of oxygen flux were obtained. In POM reaction condition, the membrane tube shows a very good stability. 展开更多
关键词 membrane REACTOR oxygen separation POM mixed-conducting membrane SYNGAS perovskite.
原文传递
熔盐电解法制备钛及其合金的研究现状
16
作者 董硕 梁精龙 《稀有金属与硬质合金》 CAS CSCD 北大核心 2023年第5期1-7,共7页
伴随时代发展,制备钛及其合金的工艺愈发绿色环保。目前,熔盐电解法因其低能耗、污染小等特点在钛及其合金制备工艺中备受关注。本文就近些年来熔盐电解法中作为研究热点的FFC剑桥工艺、OS钙热还原法、固体透氧膜法(SOM)以及USTB法四种... 伴随时代发展,制备钛及其合金的工艺愈发绿色环保。目前,熔盐电解法因其低能耗、污染小等特点在钛及其合金制备工艺中备受关注。本文就近些年来熔盐电解法中作为研究热点的FFC剑桥工艺、OS钙热还原法、固体透氧膜法(SOM)以及USTB法四种方法的还原机制进行详细的介绍,对其最近研究进展进行概述,对比分析其优缺点并以研究现状作为基础展望未来熔盐电解法的发展方向。 展开更多
关键词 熔盐电解 还原机制 FFC剑桥工艺 OS钙热还原法 固体透氧膜法 USTB法
下载PDF
陶瓷中空纤维透氧膜的制备与性能 被引量:8
17
作者 谭小耀 孟波 杨乃涛 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2006年第1期245-249,共5页
应用相转化法制备了La0.6Sr0.4Co0.2Fe0.8O3-α(LSCF)氧离子-电子混合传导陶瓷中空纤维膜,该陶瓷中空纤维膜具有由多孔层和致密层组成的非对称结构.经1300℃的4h烧结后,可得到致密的LSCF陶瓷中空纤维膜.烧结后,LSCF粒度变大而其... 应用相转化法制备了La0.6Sr0.4Co0.2Fe0.8O3-α(LSCF)氧离子-电子混合传导陶瓷中空纤维膜,该陶瓷中空纤维膜具有由多孔层和致密层组成的非对称结构.经1300℃的4h烧结后,可得到致密的LSCF陶瓷中空纤维膜.烧结后,LSCF粒度变大而其钙钛矿型晶相结构没有发生变化.LSCF中空纤维膜的透氧速率大大高于一般管式膜的氧透量. 展开更多
关键词 中空纤维 陶瓷膜 透氧膜 氧透量
下载PDF
再铸Nafion膜的制备与应用 被引量:14
18
作者 于景荣 衣宝廉 +2 位作者 刘富强 邢丹敏 张华民 《膜科学与技术》 CAS CSCD 北大核心 2002年第4期26-29,42,共5页
采用溶液 -浇铸法用商业化Nafion膜的溶解液制备再铸Nafion膜 ,对再铸Nafion膜进行了氧气渗透系数测试和电池性能评价 ,并与厚度相近的商业化Nafion膜进行比较 ,同时对再铸Nafion膜组装的PEMFC进行了短期稳定性考查 .实验结果表明 :通... 采用溶液 -浇铸法用商业化Nafion膜的溶解液制备再铸Nafion膜 ,对再铸Nafion膜进行了氧气渗透系数测试和电池性能评价 ,并与厚度相近的商业化Nafion膜进行比较 ,同时对再铸Nafion膜组装的PEMFC进行了短期稳定性考查 .实验结果表明 :通过溶液 -浇铸法制备的再铸Nafion膜可以应用于质子交换膜燃料电池 ;再铸Nafion膜的氧气渗透系数和电池性能与商业化Nafion膜相近 ;再铸Nafion膜组装PEMFC在 15 0h之内未见电池性能下降 . 展开更多
关键词 制备 应用 质子交换膜燃料电池 再铸Nafion膜 氧气渗透系数 电池性能
下载PDF
低温胁迫下银杏活性氧代谢与膜伤害的关系 被引量:17
19
作者 郁万文 曹福亮 汪贵斌 《东北林业大学学报》 CAS CSCD 北大核心 2010年第7期46-48,共3页
测试当年生盆栽银杏叶片膜相对透性,丙二醛(MDA)、过氧化氢(H2O2)质量摩尔浓度,超氧阴离子自由基(O2-)产生速率,超氧化物歧化酶(SOD)、过氧化物酶(POD)活性对低温胁迫的响应。结果表明:在10℃和5℃条件下,银杏叶片SOD和POD活性升高,而O2... 测试当年生盆栽银杏叶片膜相对透性,丙二醛(MDA)、过氧化氢(H2O2)质量摩尔浓度,超氧阴离子自由基(O2-)产生速率,超氧化物歧化酶(SOD)、过氧化物酶(POD)活性对低温胁迫的响应。结果表明:在10℃和5℃条件下,银杏叶片SOD和POD活性升高,而O2-产生速率和H2O2、MDA质量摩尔浓度及相对电导率(RP,P)略有升高,但在胁迫末期趋于恒定,表明银杏叶中活性氧代谢达到了一个新的平衡。在0℃和-2℃条件下,胁迫初期,叶片SOD、POD活性上升,O2-产生速率和H2O2质量摩尔浓度也迅速升高,同时MDA质量摩尔浓度和膜透性显著升高;胁迫后期,SOD和POD活性的降幅显著高于O2-产生速率和H2O2质量摩尔浓度,同时MDA质量摩尔浓度和膜透性进一步升高,表明短期(48h和24h内)低温条件下,SOD和POD可部分清除活性氧,而长期低温则造成体内活性氧代谢的严重失衡,致使机体受到伤害,甚至死亡。 展开更多
关键词 低温胁迫 银杏 活性氧代谢 膜透性
下载PDF
La_2NiO_(4+δ)透氧膜材料的结构特点与性能 被引量:4
20
作者 张华 金江 +3 位作者 余桂郁 杨南如 施剑林 冯景伟 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2001年第3期442-446,共5页
讨论了La2NiO4+δ透氧膜材料的结构特点及氧渗透性能.对La2NiO4+δ试样电子衍射谱的分析表明,其结构中由于填隙氧离子的存在及其有序化,出现了超结构现象,并根据此结构对衍射谱进行了指标化,同时探讨了结构特点与... 讨论了La2NiO4+δ透氧膜材料的结构特点及氧渗透性能.对La2NiO4+δ试样电子衍射谱的分析表明,其结构中由于填隙氧离子的存在及其有序化,出现了超结构现象,并根据此结构对衍射谱进行了指标化,同时探讨了结构特点与透氧机制之间的关系. 展开更多
关键词 透氧膜 晶体结构 混合导电性 氧渗透性能 膜分离 镍酸镧 膜材料 制备
下载PDF
上一页 1 2 6 下一页 到第
使用帮助 返回顶部