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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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Oxidation of Al_2O_3-30%TiCN-0.2%Y_2O_3 Composite 认领 引用 被引量:3
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作者 李喜坤 邱关明 +3 位作者 修稚萌 孙旭东 严长浩 代少俊 《Journal of Rare Earths》 SCIE EI CAS 2005年第3期276-279,共4页
The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal ... The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal atmosphere follows the parabolic law. Oxide increases with increasing temperature and prolonging time. It has good oxidation resistance. The product of oxidation of the material is TiO2. Therefore, the volume of the material expands. The oxide film is destroyed because residual stress inside the oxide film is released. Proper oxidation is beneficial to the improvement of bending strength of Al2O3-30%TiCN-0.2%Y2O3 composite. The strength increase is up to 4.5%. 展开更多
关键词 composite Al2O3-30%TiCN-0.2%Y2O3 oxidation behavior bend strength parabolic law residual stress rare earths
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溶胶-凝胶-喷雾干燥法制备超细Al_2O_3-SiO_2二元粉体材料 认领 引用 被引量:6
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作者 马清 葛山 +2 位作者 赵惠忠 张鑫 汪厚植 《耐火材料》 EI CAS 北大核心 2005年第5期347-350,共4页
以硝酸铝(Al(NO3)3·9H2O)和正硅酸乙酯(TEOS)为原料,采用溶胶-凝胶(Sol-Gel)技术并结合喷雾干燥(SPD)技术制得超细Al2O3-SiO2二元复合粉体材料,并分别于400℃、800℃、1000℃、1150℃和1200℃煅烧2 h;采用全自动比表面积与孔隙率... 以硝酸铝(Al(NO3)3·9H2O)和正硅酸乙酯(TEOS)为原料,采用溶胶-凝胶(Sol-Gel)技术并结合喷雾干燥(SPD)技术制得超细Al2O3-SiO2二元复合粉体材料,并分别于400℃、800℃、1000℃、1150℃和1200℃煅烧2 h;采用全自动比表面积与孔隙率分析仪、TEM、TG-DSC及XRD等仪器研究了热处理温度、pH值(分别为5.5、7和8)以及干燥方法对粉体材料的表面性能、显微形貌、物相组成及Al2O3-SiO2二元系晶体转变过程的影响.结果表明:由Sol-Gel-SPD制备的超细Al2O3-SiO2二元粉体材料的比表面积>448 m2·g-1,而经1200℃煅烧2 h后所得的超细莫来石的比表面积34.05m2·g-1;TG-DSC分析表明:采用Sol-Gel-SPD制得的Al2O3-SiO2二元粉体材料的质量损失主要发生在500℃之前;XRD分析表明:粉体试样的开始莫来石化温度为1000℃,铝硅尖晶石(6Al2O3·SiO2)与非晶态SiO2在1150~1200℃完全转化为莫来石;比较不同pH值试样经1200℃煅烧后的TEM照片发现,当pH=7时,得到的超细莫来石粉体粒径最小,为50 nm. 展开更多
关键词 溶胶-凝胶 喷雾干燥 Al2O3-SiO2 超细粉体 莫来石 粉体材料 二元系 超细 制备 非晶态SiO2
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Effects of Y_2O_3 on Thermal Shock of Al_2O_3/TiCN Composites 认领 引用 被引量:3
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作者 邱关明 李喜坤 +3 位作者 修稚萌 孙旭东 严长浩 代少俊 《Journal of Rare Earths》 SCIE EI CAS 2005年第3期266-270,共5页
Thermal shock resistance of Al2O3-TiCN(30%)-Y2O3(0.2%) composite was studied by hot pressing(HP) method at different temperatures. The study shows that thermal shock resistance of the material is determined by its mic... Thermal shock resistance of Al2O3-TiCN(30%)-Y2O3(0.2%) composite was studied by hot pressing(HP) method at different temperatures. The study shows that thermal shock resistance of the material is determined by its microstructure and reinforced mechanism. According to SEM and calculation of thermal shock, the fractured surface of Al2O3-30%TiCN-0.2%Y2O3 composite is undulate. The residual strength of Al2O3-30%TiCN-0.2%Y2O3 is higher than Al2O3-30%TiCN at 200~800 ℃ after thermal shock. Cracks initiation resistance (R′)and cracks propagation resistance (R″″)of Al2O3-30%TiCN-0.2%Y2O3 composite increases 12% and 5% respectively compared with that of Al2O3-30%TiCN. It matches with experimental results. The addition of Y2O3 forms YAG that inhibits crystal growth, and increases fracture stress, fracture toughness, cracks initiation resistance and cracks propagation resistance. Therefore, thermal shock resistance increases. The fracture work of Al2O3-30%TiCN and Al2O3-30%TiCN-0.2%Y2O3 composites are 132 and 148 J·m-2 respectively. 展开更多
关键词 composite Al2O3-30%TiCN-0.2%Y2O3 thermal shock bending strength work of fracture rare earths
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SiO_2微粉和Al_2O_3微粉加入量对莫来石-刚玉浇注料性能的影响 认领 引用 被引量:7
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作者 李洪波 赵继增 陈奇 《耐火材料》 EI CAS 北大核心 2007年第6期435-438,共4页
以莫来石M45(10~5mm,5~3mm)、电熔莫来石(3~1mm,≤1mm)作骨料,刚玉粉(≤0.074mm)、电熔莫来石粉(≤0.074mm)、纯铝酸钙水泥、Al2O3微粉(d50=2.11μm)和SiO2微粉(d50=1.07μm)作基质,制备了脱硫枪用莫来石-刚玉浇注料,并分别研究了SiO... 以莫来石M45(10~5mm,5~3mm)、电熔莫来石(3~1mm,≤1mm)作骨料,刚玉粉(≤0.074mm)、电熔莫来石粉(≤0.074mm)、纯铝酸钙水泥、Al2O3微粉(d50=2.11μm)和SiO2微粉(d50=1.07μm)作基质,制备了脱硫枪用莫来石-刚玉浇注料,并分别研究了SiO2微粉加入量(分别为2%、3%、4%、5%)和Al2O3微粉加入量(分别为2%、4%、6%)对浇注料体积密度、显气孔率、强度、烧后永久线变化率、抗热震性和抗渣性的影响。结果表明:仅加入SiO2微粉时,随着其加入量在2%~5%范围内增加,莫来石-刚玉浇注料的体积密度提高,显气孔率降低,强度增加,抗渣性变好,但抗热震性变差;在加入3%SiO2微粉的基础上再加入2%~6%的Al2O3微粉时,浇注料的各项性能随Al2O3微粉增加没有明显改善,但均比仅加入3%SiO2微粉时有明显改善。 展开更多
关键词 SiO2微粉 Al2O3微粉 莫来石-刚玉浇注料 脱硫喷枪
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Al_2O_3-2SiO_2 Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion 认领 引用 被引量:2
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作者 郑广俭 崔学民 +2 位作者 张伟鹏 童张法 李峰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期312-318,共7页
Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane(TEOS) and aluminum nitrate(ANN) as the starting materials.DTS,TEM,SEM and BET were employed to study the effect... Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane(TEOS) and aluminum nitrate(ANN) as the starting materials.DTS,TEM,SEM and BET were employed to study the effects of process parameters on the size,specific surface area and structure(morphology) of powders.The alkali-activation reactivity of the powders was tested for manufacturing geopolymers and their hydrothermal reactions were performed for fabricating zeolites.The results show that the optimum process parameters and drying method for preparing Al2O3-2SiO2 nanopowders are as follows:the molar ratio of water and ethanol to TEOS are 0:1 and 12:1 respectively at synthetic temperature of 50 ℃ and the drying method is azeotropic distillation with microwave drying.The average particle diameters of the powders were about 70 nm and the largest BET specific surface area was up to 669 m^2·g^-1.The compressive strength of the geopolymer and the calcium exchange capacity(by CaCO3) of NaA zeolite prepared with the powders reached to 29 MPa and 366 m^2·g^-1 respectively. 展开更多
关键词 parameter optimization Al2O3-2SiO2 nanopowder sol-gel geopolymer zeolite
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Al_2O_3-SiO_2纤维增强ZL109合金复合材料的强度特性 认领 引用 被引量:3
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作者 张茂勋 陈晓 +2 位作者 钱匡武 里达雄 神尾彰彦 《福州大学学报(自然科学版)》 CAS 1998年第5期51-55,共5页
用低成本的Al2O3-SiO2系纤维作为增强相,通过加压铸造法制作ZL109合金复合材料,并对该复合材料(Vf20%)和ZL109合金进行不同温度下的时效处理和压缩试验.通过DSC和TEM分析认为:复合材料中的基体具有和ZL109合金一样的时效硬化特... 用低成本的Al2O3-SiO2系纤维作为增强相,通过加压铸造法制作ZL109合金复合材料,并对该复合材料(Vf20%)和ZL109合金进行不同温度下的时效处理和压缩试验.通过DSC和TEM分析认为:复合材料中的基体具有和ZL109合金一样的时效硬化特性,所以纤维对ZL109合金的增强效果明显.在高温下或在高温下长期保温后的基体材料中时效硬化作用消失,所以纤维的增强作用更为显著. 展开更多
关键词 复合材料 强度 铝基 铝合金 纤维增强
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Sol-Gel法制备Al_2O_3-SiO_2-TiO_2-ZrO_2复合陶瓷膜的研究 认领 引用 被引量:4
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作者 徐晓虹 吴建锋 +1 位作者 白占良 张英 《中国陶瓷》 CAS 2003年第6期21-23,共3页
将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起... 将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起膜的显微结构的变化。利用XRD、SEM、AFM、EPMA等测试手段重点研究了膜的表面形貌和显微结构,并分析了添加剂、热处理方式等对膜的表面形貌和显微结构影响。 展开更多
关键词 溶胶—凝胶法 Al2O3—SiO2—TiO2—ZrO2复合陶瓷膜 表面形貌 显微结构
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ZrO_2_-3Al_2O_3-2Sio_2/SiC_n纳-微米复相陶瓷的反应烧结技术 认领 引用 被引量:1
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作者 刘福田 常钧 +2 位作者 王志 木春玲 程新 《陶瓷工程》 2001年第5期35-38,共4页
概述复相陶瓷和纳米陶瓷的主要内容和机理,介绍反应烧结ZrO2-3Al2O3·2SiO2-Al2O3/SiCn纳米复相陶瓷技术的研究内容、技术路线、工艺原理和发展前景。
关键词 复相陶瓷 纳-微米陶瓷 反应烧结 ZrO3-3Al2O3-2SiO2-Al2O3/SiCn
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不同炭化温度制备的C/0.5Al_2O_3-0.5P_2O_5-100SiO_2凝胶玻璃的光学性质 认领 引用
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作者 杨合情 王喧 +4 位作者 张邦劳 李永放 房喻 张良莹 姚熹 《无机材料学报》 SCIE EI CAS 北大核心 2003年第6期1181-1186,共6页
通过醇盐不完全水解制备了含有有机基团(O-C_2H_5)的0.5Al_2O_3-0.5P_2O_5-100SiO_2凝胶,在氮气中加热到300~700℃使其中的有机基团炭化,得到镶嵌在凝胶玻璃中不同尺寸的碳纳米颗粒.利用高分辨电镜、X射线衍射和喇曼光谱研究了碳纳米... 通过醇盐不完全水解制备了含有有机基团(O-C_2H_5)的0.5Al_2O_3-0.5P_2O_5-100SiO_2凝胶,在氮气中加热到300~700℃使其中的有机基团炭化,得到镶嵌在凝胶玻璃中不同尺寸的碳纳米颗粒.利用高分辨电镜、X射线衍射和喇曼光谱研究了碳纳米颗粒的结构,发现凝胶玻璃中的碳颗粒为非晶碳纳米颗粒.测试了它们的吸收光谱,发现了由于量子限域效应引起的吸收边的移动.在532um Nd:YAG激光的激发下镶嵌有碳纳米颗粒的凝胶玻璃有一强的室温发光,发光峰在586um左右.发光峰几乎不随碳纳米颗粒尺寸的变化而变化.这种发光产生于碳纳米颗粒的表面或碳颗粒和凝胶网络的界面. 展开更多
关键词 C/0.5Al2O3-0.5P2O5-100SiO2凝胶玻璃 红光发射 吸收光谱
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介孔SiO_2/Al_2O_3固体酸催化γ-戊内酯脱羰基制备丁烯 认领 引用 被引量:2
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作者 张战 辛加余 +3 位作者 魏灵朝 吕兴梅 任保增 张锁江 《过程工程学报》 CAS CSCD 北大核心 2014年第3期444-449,共6页
采用溶胶-凝胶法合成了介孔SiO2/Al2O3催化剂,用于γ-戊内酯脱羰基制丁烯,对催化剂进行了表征,考察了反应条件对丁烯生成的影响,并分析了γ-戊内酯脱羰基制丁烯的反应机理.结果表明,SiO2/Al2O3的平均吸附孔径为6.8768 nm,BET比表面积达3... 采用溶胶-凝胶法合成了介孔SiO2/Al2O3催化剂,用于γ-戊内酯脱羰基制丁烯,对催化剂进行了表征,考察了反应条件对丁烯生成的影响,并分析了γ-戊内酯脱羰基制丁烯的反应机理.结果表明,SiO2/Al2O3的平均吸附孔径为6.8768 nm,BET比表面积达398.4 m2/g,催化剂表面存在Lewis和Br?nsted酸位;在350℃、催化剂用量为γ-戊内酯量的5%(ω)、反应4 h的条件下,γ-戊内酯的转化率在99%以上,丁烯产率最高达97%;反应机理为,在SiO2/Al2O3作用下,γ-戊内酯先开环生成戊烯酸,戊烯酸发生α和β碳裂解生成丁烯和CO2. 展开更多
关键词 生物质 丁烯 γ-戊内酯 介孔SiO2/Al2O3 脱羰基
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ZrO_2-3Al_2O_3·2SiO_2-Al_2O_3系相关系和相变 认领 引用 被引量:5
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作者 高振昕 《硅酸盐学报》 CAS 1988年第3期280-288,共9页
本工作采用OM、XRD、SEM和EDAX诸仪器研究了ZrO_2-3Al_2O_3·2SiO_2-Al_2O_3系在缓冷和淬火条件下各组成试样的相关系。在该系的三元不变点附近选择了15个试样,其ZrO_2含量为30—35Wt%,Al_2O_3/SiO_2比(mol)为1.5—2.0。用OM和SEM... 本工作采用OM、XRD、SEM和EDAX诸仪器研究了ZrO_2-3Al_2O_3·2SiO_2-Al_2O_3系在缓冷和淬火条件下各组成试样的相关系。在该系的三元不变点附近选择了15个试样,其ZrO_2含量为30—35Wt%,Al_2O_3/SiO_2比(mol)为1.5—2.0。用OM和SEM观察了缓冷和淬火试样的析晶形貌特征。试样从1750℃淬火,析出细纤维状莫来石和亚显微质四方ZrO_2,在较低温度淬火或缓冷时,四方ZrO_2转变为单斜相并得到典型的莫来石-斜锆石共析体。在缓冷试样中可观察到包晶反应形貌。XRD分析表明缓冷和淬火的莫来石晶格常数的变异。用EDAX点分析,测出了莫来石和斜锆石具有组份互溶性。在本试验组成区域内不宜确定精确的三元不变点。 展开更多
关键词 莫来石相 错石 刚玉 玻璃相 析晶 缓冷 EDAX SEM 宝石 金相相组成 Al2O3 ZrO2-3Al2O3 SiO 相关系
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SiO_2对Al_2O_3凝胶纤维相变的影响 认领 引用 被引量:5
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作者 何静 林志君 +2 位作者 张力 丁马太 陈立富 《功能材料》 EI CAS CSCD 北大核心 2013年第7期926-931,共6页
以尿素催化硅酸乙酯水解制得SiO2溶胶。采用29Si NMR、27 Al NMR、FT-IR、TEM、DTA、XRD和SEM等对SiO2溶胶、Al2O3凝胶纤维化学结构和微观结构研究结果表明,该SiO2溶胶稳定性好,含有大量的单硅酸Si(OH)4,能和Al2O3表面的Al—OH反应生成A... 以尿素催化硅酸乙酯水解制得SiO2溶胶。采用29Si NMR、27 Al NMR、FT-IR、TEM、DTA、XRD和SEM等对SiO2溶胶、Al2O3凝胶纤维化学结构和微观结构研究结果表明,该SiO2溶胶稳定性好,含有大量的单硅酸Si(OH)4,能和Al2O3表面的Al—OH反应生成Al—O—Si键而有效地将其包裹,从而阻止了过渡态Al2O3微晶的相互接触,抑制了α-Al2O3的成核和生长。 展开更多
关键词 Al2O3纤维 SiO2 相变 溶胶-凝胶
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Al_2O_3/SiO_2耐磨增透膜的制备和表征 认领 引用 被引量:5
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作者 陈明洁 郭志坚 印冰 《太阳能学报》 EI CAS CSCD 北大核心 2011年第10期1440-1444,共5页
以正硅酸乙酯(TEOS)和异丙醇铝(Al(OC_3H_7)_3)为前驱体,采用溶胶-凝胶(sol-gel)提拉方法在玻璃基片上制得高透、耐磨的增透膜。使用XRD、UV-Vis、IR、和TEM测试和分析了溶胶和薄膜的结构及性能。研究表明:通过添加一定比例的Al_2O_3,... 以正硅酸乙酯(TEOS)和异丙醇铝(Al(OC_3H_7)_3)为前驱体,采用溶胶-凝胶(sol-gel)提拉方法在玻璃基片上制得高透、耐磨的增透膜。使用XRD、UV-Vis、IR、和TEM测试和分析了溶胶和薄膜的结构及性能。研究表明:通过添加一定比例的Al_2O_3,使颗粒之间生成稳定致密的氧桥键Si—O—Al以及煅烧后γ-Al_2O_3的存在,调控了薄膜的微观结构,不仅明显提高了薄膜的力学性能,同时复合薄膜的光学透过率仍最高达99.2%。 展开更多
关键词 增透膜 Al2O3/SiO2 溶胶-凝胶法 耐磨
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CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[H_XRu_3(CO)_9(CCO)]2-X/SiO_2-Al_2O_3,SiO_2 AND MgO(X=0-2)CATALYSTS 认领 引用
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作者 Feng Shou XIAO RuRen XU Masaru ICHIKAWA Duward F.SHRIVER Xie Xian GUO 《Chinese Chemical Letters》 SCIE CAS 1991年第7期579-580,共2页
The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and etha... The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and ethane in ethylene hydroformylation. 展开更多
关键词 CCO X=0-2)CATALYSTS CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[HXRu3 X SiO2-Al2O3,SiO2 AND MgO MgO Al
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脱铝超稳Y沸石的SiO_2/Al_2O_3比与催化性能的研究 认领 引用
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作者 郭建平 张尚 尹笃林 《化学研究与应用》 CAS 北大核心 2002年第1期76-78,共3页
The effective B acid amount of dealuminated USY(DUSY) zeolites with different silica/alumina ratios were measured by UV spectrometry with 2,6 dimethyl pyridine as adsorbentes in the presence of cyclohexane or anhydrou... The effective B acid amount of dealuminated USY(DUSY) zeolites with different silica/alumina ratios were measured by UV spectrometry with 2,6 dimethyl pyridine as adsorbentes in the presence of cyclohexane or anhydrous ethanol or tetrahydrofuran.The isomerization of α pinene was used to check the acidic catalytic properties of these zeolites.The results indicate that effective B acid amount of DUSY measured in polar anhydrous ethanol or tetrahydrofuran is lower than that of non polar cyclohexane.The effect of solution concentration of effective B acid amount of DUSY zeolites is small.As the silica/alumina ratio of catalyst increases,effective B acid amount and conversion of isomerization of α pinene all raise. 展开更多
关键词 脱铝超稳Y沸石 紫外光谱法 固体酸 α-蒎烯 异构化 催化性能 SiO2 Al2O3 催化剂 表面酸性 二氧化硅 三氧化二铝
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Fabrication and Studying the Mechanical Properties of A356 Alloy Reinforced with Al2O3-10% Vol. ZrO2Nano-particles through Stir Casting 认领 引用 被引量:2
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作者 Mohsen Hajizamani Hamidreza Baharvandi 《Advances in Materials Physics and Chemistry》 CAS 2011年第2期26-30,共5页
Al2O3-ZrO2 with a high level of hardness and toughness is known as ceramic steel. Due to its unique properties it can be used as a reinforcement in fabrication of metal matrix composites. In this study, nanoparticles ... Al2O3-ZrO2 with a high level of hardness and toughness is known as ceramic steel. Due to its unique properties it can be used as a reinforcement in fabrication of metal matrix composites. In this study, nanoparticles of Al2O3-10% ZrO2 with an average size of 80 nm were used to fabricate Al matrix composites containing 0.5, 1, 1.5 and 2 wt.% of the reinforcement. The fabrication route was stir casting at 850?C. There is no report about usage of this reinforcement in fabrication of composites in the literature. The microstructures of the as-cast composites were studied by scanning electron microscope (SEM). Density measurement, hardness and tensile properties were carried out to identify the mechanical properties of the composites. The results revealed that with increasing the reinforcement content, density decreased while yield, ultimate tensile strength and compressive strength increased. Also, hardness increased by increasing the reinforcement content up to 1 wt.% Al2O3-10% ZrO2 but it decreased in the samples containing higher amounts of reinforcement. 展开更多
关键词 Stir Casting Al Matrix Composite Al2O3-10% ZrO2 Nanoparticles
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TiO_2/SiO_2催化剂的1-己烯异构化性能研究 认领 引用 被引量:2
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作者 张胜振 董鹏 +2 位作者 张毓莹 杜维君 陈胜利 《石油与天然气化工》 CAS 北大核心 2005年第1期3-7,共5页
以商业粗孔硅胶为载体、钛酸四丁酯为原料制备了负载型TiO2 /SiO2 复合氧化物,分别采用H2SO4 和USY、PREHY、Hβ、SAPO-11等分子筛对其进行改性,并以1-己烯的异构化反应为探针反应,在加氢微反装置上考察了复合氧化物及改性复合氧化物对... 以商业粗孔硅胶为载体、钛酸四丁酯为原料制备了负载型TiO2 /SiO2 复合氧化物,分别采用H2SO4 和USY、PREHY、Hβ、SAPO-11等分子筛对其进行改性,并以1-己烯的异构化反应为探针反应,在加氢微反装置上考察了复合氧化物及改性复合氧化物对1 -己烯的异构化性能。结果表明,TiO2 /SiO2 具有比商业Al2O3 更大的酸量和更高的1-己烯骨架异构化选择性;TiO2 /SiO2 经硫酸改性后表面酸量和酸强度有所提高, 1-己烯的骨架异构化性能得到改善;在所用分子筛中,SAPO-11改性的TiO2 /SiO2 具有最高的1-己烯骨架异构化选择性;但同时具有较高的1-己烯缩合-裂解反应选择性。 展开更多
关键词 TiO2/SiO2 1-己烯 性能研究 催化剂 复合氧化物 骨架异构化 SAPO-11 钛酸四丁酯 H2SO4 异构化反应 Al2O3 反应选择性 原料制备 探针反应 1-已烯 表面酸量 分子筛 负载型 USY 酸强度 酸改性 商业 硅胶 裂解 缩合
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Formation of O‘—Sialon Matrix and Microstructure Development in the Refractory of Si3N4—SiO2—ZrO2—Al2O3 System 认领 引用
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作者 KEChangming SUNChengxu 《China's Refractories》 CAS 1997年第3期30-34,共5页
An O'-Sialon-Al2O3 composite refractory was prepared by in situ reaction of Si3N4-ZrSiO4-Al2O3 mixture with fused alumina aggregates.Densification,in situreaction procedure and microstructure of the material were ... An O'-Sialon-Al2O3 composite refractory was prepared by in situ reaction of Si3N4-ZrSiO4-Al2O3 mixture with fused alumina aggregates.Densification,in situreaction procedure and microstructure of the material were investigated by means of X-ray diffraction,optical and scanning electronic microscopes and EDAX. 展开更多
关键词 O′-硅铝氧氮聚合材料 氧化锆 三氧化二铝 Al2O3 SiO2 ZrO2 微观结构 耐火材料
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Alkali-activation reactivity of chemosynthetic Al_2O_3-2SiO_2 powders and their 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectra 认领 引用 被引量:3
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作者 Guangjian Zheng Xuemin Cui +4 位作者 Dong Huang Jinying Pang Guowei Mo Shujuan Yu Zhangfa Tong 《Particuology》 SCIE EI CAS CSCD 2015年第5期151-156,共6页
Pure Al2O3-2SiO2 powders were prepared by sol-gel and coprecipitation methods, and their alkaliactivation reactivities were compared. The alkali-activation reactivity of the powder prepared by the so]-gel method was h... Pure Al2O3-2SiO2 powders were prepared by sol-gel and coprecipitation methods, and their alkaliactivation reactivities were compared. The alkali-activation reactivity of the powder prepared by the so]-gel method was higher than that of the powder prepared by the coprecipitation method. The powders were investigated by 27Al and 29Si magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) to understand the relationship between their structure and alkali-activation reactivity. The 27Al MAS NMR data showed that the five-coordinate AI content of the powder prepared by the sol-gel method was higher than that of the powder prepared by coprecipitation. The higher content of five-coordinate Al corresponded to higher alkali-activation reactivity. The 29Si MAS NMR data showed that for the powder prepared by the sol-gel method, silicon was replaced by aluminum at secondary coordination sites of the central Si atoms during calcination. However, for the powder prepared by single-batch coprecipitation, the main change was from a low degree of polycondensation to a high degree of polycondensation. 展开更多
关键词 Geopolymer Al2O3-2SIO2 powder AlkAli-activation reactivity NMR Chemosynthesis
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