Fe2O3—Cr2O3选择性吸收涂层的研究

研究了Ｆｅ２Ｏ３－Ｃｒ２Ｏ３有机硅改性丙烯酸选择性吸收涂层及其与ＴｉＯ２－ＳｉＯ２选择性透过膜复合涂层的性能，讨论了影响涂层光学性能的因素。当黑色颜料用量为４０－５０％、粒径０．０５－０．５μｍ、掺铝箔２０％左右、涂层厚度的２μｍ时，涂层光学性能较佳。该涂层还有较好的力学、耐腐蚀及耐老化等性能。涂敷ＴｉＯ２－ＳｉＯ２薄膜后其光学性能、硬度和耐蚀性等均得到改善。     

等离子喷涂γ—Al2O3和α—Al2O3涂层的性能和结构

用优选的喷焰参数制备了含有９９．５％以上的γ－Ａｌ２Ｏ３的喷涂态涂层，该涂层具有０．１－１μｍ直径的颗粒，其薄层厚度为１－４μｍ。用同样的喷焰条件，但缓慢地在基体上移动，产生了含有α－Ａｌ２Ｏ３涂层。在每个喷焰的喷道中观察到三种类型的显微结构：类型Ｉ，在较下面的区域，认为已形成了γ－Ａｌ２Ｏ３晶核，并且由于喷焰和涂层的热量而转变成α－Ａｌ２Ｏ３相；类型Ⅲ；在类型Ｉ上连，形成了α－Ａｌ２Ｏ３晶核，在     

Al2O3—SiC复合材料的试验研究

在Ａｌ２Ｏ３－ＺｒＯ２基础上，添加１０％－３０％ＳｉＣ，结果表明：其复合材料的抗弯强度变化不大，抗热震性临界温差可提高１５．８％－２６．２％，但高温电阻率有些降低。     

用实验和概率密度函数方法研究NH3—NO—O2—N2柱塞流中NOx和N2O…

本文利用实验和求解化学热力学参数联合概率密度函数输方程的方法，即概率密度数方法，研究并计算了ＮＨ３－ＮＯ－Ｏ２－Ｎ２柱塞流中ＮＯｘ及Ｎ２Ｏ的生成反应。     

Al2O3—ZrO2（f）复合陶瓷材料的试验研究

在Ａｌ２Ｏ３－ＺｒＯ２材料基础上添加５％－１５％ＺｒＯ２（ｆ），结果表明，可使新复合材料的抗弯强度提高１２．３％－５５．６％，抗热震临界温差提高１７．８％－４４．６％，其抗热震 具有动态裂纹扩展的特性。     

添加ZrO2对Al2O3—TiB2复相陶瓷性能的影响

论述了在Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷的基础上添加ＺｒＯ２对Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷性能的影响；初步探讨了添加ＺｒＯ２后对材料强韧化机理和磨损机理的影响。研究表明，在Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷中加入ＺｒＯ２后，由于两种增韧机制的协同作用，材料强度和韧性明显提高，同时，ＺｒＯ２的相变增韧作用有利于材料抗磨损性能的提高。     

LME砂磨机在α—Al2O3微粉生产中的应用

介绍了德国内兹公司所产出的ＬＭＥ２００型砂磨机在α－Ａｌ２Ｏ３微粉生产中的使用情况；介绍总结了生产工艺参数；加球量，料水比，球耗，磨机电流等，当磨机电流控制在７０Ａ左右时，生产α－Ａｌ２Ｏ３微粉球耗较低，砂磨机适应于生产低污染，高细度的α－Ａｌ２Ｏ３微粉     

La2O3改进Ni/γ-Al2O3催化剂上沼气重整制氢

为了寻求制备氢气的可再生资源及减少沼气的排放量,用浸渍法制备了不同La2O3含量的Ni/La2O3/γ Al2O3催化剂,用CH4/CO2体积比为1的混合气体模拟沼气,考察了还原温度、反应温度、空速等操作条件对该催化剂上沼气重整制氢性能的影响.并运用H2-TPR、TEM、TG-DSC等对催化剂进行了表征.结果表明:La2O3含量为6%的催化剂具有较好的综合性能;载体中掺杂适量La2O3能增加金属Ni的分散性,提高催化剂的可还原性及载体对CO2的吸附能力,从而改善了催化剂的活性及抗积炭性,使催化剂具有较好的稳定性.在100h的稳定性实验中,CH4及CO2转化率、H2及CO的选择性、H2/CO比平均值分别约为87.4%、88.8%、87.3%、93.8%及0.92.催化剂表面积炭速率非常低,仅为0.7279mg/(gcat·h).     

复合矿化剂在煅烧α—Al2O3中的应用

用传统的矿化剂煅烧的α－Ａｌ２Ｏ３产品具有难磨，颜色黄及晶粒粗大等缺点。通过实验研究了硼酸、氯化铵复合矿化剂对α－Ａｌ２Ｏ３产品性能的影响，并进行了工业实验。实验表明：复合矿化剂的效果明显优于单用硼酸或氯化铵做矿化的效果；调整Ｃｌ＾－／Ｂ２Ｏ３比例可控制α－Ａｌ２Ｏ３晶粒尺寸；氯化铵做矿化剂可用来煅烧晶粒较小的α－Ａｌ２Ｏ３产品     

Cu/La2O3/Al2O3催化剂上甲醇水蒸气重整制氢反应

研究以并流共沉淀法制备Cu/La2 O3 /Al2 O3 系列催化剂催化甲醇水蒸气重整制氢反应过程 ,考察了La2 O3含量、反应温度、水醇比、液体空速 (WHSV)等因素对催化剂活性的影响。结果表明 :催化剂表现出较好的低温活性、高氢气选择性和稳定性。La2 O3 质量分数为 15 % ,在 2 5 0℃反应时 ,催化剂活性表现最佳 ,甲醇摩尔转化率为94 .5 % ,氢气选择性为 10 0 % ,CO摩尔分数为 1.0 5× 10 -7。     

Electrocatalytic activity of metal—substituted Fe3O4 obtained at low temperature for O2 evolution

The electrocatalysis of O₂ evolution has been studied at the Co_xFe_3−xO₄ (0 ⩽ x ⩽ 1.5), Cu_xFe_3−xO₄ (0.1 ⩽ x ⩽ 1.5), Co_1.5−xMn_xFe_1.5O₄ (0.1 ⩽ x ⩽ 0.5), and Co_1.5−xNi_xFe_1.5O₄ (0.1 ⩽ x ⩽ 0.5) anodes in KOH solutions at 25°C. The oxides were obtained at 70°C as precipitate and produced in the film forms on a nickel support by an oxide-slurry painting technique. The study showed that both the electrochemically active area as well as the apparent electrocatalytic activity of the oxide increased significantly with increasing replacement of Fe by Co following maximum with x = 1.5. These properties further enhanced nearly by two-fold with 0.5 mol Mn-substitution in Co_1.5Fe_1.5O₄. 1.0 mol Ni-substitution in the Fe₃O₄ lattice was also greatly beneficial from the electrocatalytic point of view. In contrast, its substitution (0.1–0.5 mol) in the Co_1.5Fe_1.5O₄ lattice was not. Also, Cu-substitution in the base oxide did not indicate any electrocatalytic effect. The reaction order ( p) and the Tafel slope (b) have been observed to vary with the introduction of Co. The electroformation of O₂ on the active electrodes, namely, NiFe₂O₄, CoFe₂O₄ and Co_1.5Fe_1.5O₄, exhibited approximately second-order kinetics in OH⁻ concentration. © 1999 International Assocation for Hydrogen Energy.     

SiO2–CaO–B2O3–Al2O3 ceramic glaze as sealant for planar ITSOFC

A series of ceramic glazes based on the SiO₂–CaO–B₂O₃–Al₂O₃ system as sealant for intermediate temperature solid oxide fuel cell (ITSOFC) were investigated. Different ratios of B₂O₃/SiO₂ and Al₂O₃/CaO were investigated to control softening process, phase separation, and crystallization. When B₂O₃/SiO₂ ratio was in the range of 0.14–0.27, the glazes showed good wetting and bonding behavior with both 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte and stainless steel interconnect which could satisfy the sealing demand at 850 °C. And the dimension stability can be kept for over 100 h by introducing ceramic felt and controlling the glazes viscosity in the range of 10⁴ to 10⁶ Pa s. By means of controlling Al₂O₃/CaO ratio in the range of 0.4–0.68, phase separation and crystallization were restrained effectively. After holding at 850 °C for 100 h, non-crystalline network in the glazes could be found, and a suitable viscous flow could well relax thermal stress. The sealing was effective even after 10 thermal cycles. Element analysis showed a good chemical stability at the ceramic glazes/stainless steel interconnect and ceramic glazes/8YSZ electrolyte interfaces.     

组成和工艺对Al2O3—TiB2复相陶瓷性能的影响

研究了ＴｉＢ２含量及烧结工艺对Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷性能的影响，发现随着ＴｉＢ２加入量的增加，Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷的致密化困难，Ａｌ２Ｏ３－ＴｉＢ２复相陶瓷的强度在ＴｉＢ２加入的体积分数为２０％时最高，而材料的断裂韧性则在ＴｉＢ２体积分数为３０％时最高。     

燃烧中汞与N2O、O3的反应机理

采用量子化学从头计算MP2／SDD方法研究了燃烧过程中汞与N2O、O3的反应机理,优化得到反应途径上的反应物、过渡态、中间体和产物的几何构型．用QCISD(T)方法计算能量,同时进行零点能校正,并以此能量计算活化能,同时计算指前因子、反应热效应及熵变,采用经典过渡态理论计算反应速率常数．研究结果表明,量子化学是研究汞等痕量元素、气体反应的机理、动力学参数和热力学参数的一种有效手段．     

不同温度条件下SiO2-CaO-MgO—Fe2O3系微晶玻璃析晶行为

利用DTA,SEM和XRD分析方法研究了不同温度条件下SiO2-CaO-MgO-Fe2O3系微晶玻璃析晶行为。结果表明：随着温度的增加,微晶玻璃的主晶相没有改变,为透辉石,次晶相发生了变化,由硅灰石转变为硅灰石和钙镁黄长石;微晶玻璃的晶体形态由枝状晶体逐渐转变为网状晶体,分布更加均匀。比较在730℃和830℃热处理的微晶玻璃,在830℃时,微晶玻璃的晶体含量明显增加。     

用Na—MCM制备的亚微米级α—Al2O3料浆的稳定性

探讨了以Ｎａ－ＣＭＣ作为分散悬浮剂制备适于注浆成形的亚微米级α－Ａｌ２Ｏ３浆料的可行性，通过粘度、沉降高度实验，研究了Ｎａ－ＣＭＣ的加入量及Ｐ至料浆稳定性的影响，获得了稳定浆料的基本参数。     

Ni/La2O3 and Ni/MgO–La2O3 catalysts for the decomposition of NH3 into hydrogen

The decomposition of NH₃ for hydrogen production was studied using Ni/La₂O₃ catalysts at varying compositions and temperatures prepared via surfactant-templated synthesis to elucidate the influence of catalyst active metal content, support composition and calcination temperature on the catalytic activity. The catalytic performance of all samples was studied between 300 and 600 °C under atmospheric pressure. The catalytic activity of the sample were as follows: 10Ni/La₂O₃-450 > 10Ni/La₂O₃-550 > 10Ni/La₂O₃-650 ≈ 10Ni/La₂O₃-750 ≈ 10Ni/La₂O₃-850. The excellent activity (100%) of 10Ni/La₂O₃-450 could be due to the high surface area, basicity strength and concentration of surface oxygen species of the catalyst as evidenced by BET, CO₂-TPD and XPS. In addition, to adjust the activity of the catalyst support, the molar ratios of Mg and La were varied (1:1, 3:1, 5:1, 7:1 and 9:1). The 5Ni/5MgLa (5:1 M ratio) was found to be the most active (100%) relative to other Ni/MgLa formulations. Furthermore, the Ni content in the Ni/5MgLa sample was adjusted between 10 and 40 wt%. Increasing the Ni content of the catalysts increased NH₃ conversion with the 40 wt% Ni formulation demonstrating complete NH₃ conversion at 600 °C and a high gas hourly space velocities (GHSV) (30,000 mL∙h⁻¹∙g_cat⁻¹).