摘要:
A production method of an electroconductive mayenite compound having an electron density greater than or equal to 5×1020 cm−3 includes preparing an object of processing containing a mayenite compound or a precursor of a mayenite compound, placing aluminum foil on at least part of a surface of the object of processing, and retaining the object of processing at temperatures falling within the range of 1080° C. to 1450° C. in a low oxygen partial pressure atmosphere.
摘要:
Novel colored compounds with a hibonite structure and a method for making the same are disclosed. The compounds may have a formula AAl12−x−yMaxMbyO19 where A is typically an alkali metal, an alkaline earth metal, a rare earth metal, Pb, Bi or any combination thereof, and Ma is Ni, Fe, Cu, Cr, V, Mn, or Co or any combination thereof, and Mb is Ti, Sn, Ge, Si, Zr, Hf, Ga, In, Zn, Mg, Nb, Ta, Sb, Mo, W or Te or any combination thereof. Compounds with varying colors, such as blue, can be made by varying A, Ma and Mb and their relative amounts. Compositions comprising the compounds and methods for making and using the same are also disclosed.
摘要:
If a conductive mayenite compound having a large specific surface area is obtained, the usefulness thereof in respective applications is remarkably increased. A conductive mayenite compound powder having a conduction electron density of 1015 cm−3 or more and a specific surface area of 5 m2g−1 or more is produced by: the following steps: (1) forming a precursor powder by subjecting a mixture of a starting material powder and water to a hydrothermal treatment; (2) forming a mayenite compound powder by heating and dehydrating the precursor powder; (3) forming an activated mayenite compound powder by heating the compound powder in an inert gas atmosphere or in a vacuum; and (4) injecting electrons into the mayenite compound through a reduction treatment by mixing the activated mayenite compound powder with a reducing agent.
摘要:
A method of manufacturing an electrically conductive mayenite compound, includes preparing a body to be processed including a mayenite compound; and placing the body to be processed in the presence of carbon monoxide gas and aluminum vapor supplied from an aluminum source without being in contact with the aluminum source and retaining the body to be processed at a temperature range of 1080° C. to 1450° C. under a reducing atmosphere.
摘要:
Provided herein are systems, methods, and compositions related to mixtures of calcium aluminate cements with compositions comprising carbonate. The compositions comprising carbonates may be formed by sequestering carbon dioxide.
摘要:
The present invention relates to a mayenite-type compound in which a part of Ca of a mayenite-type compound containing Ca, Al and oxygen is substituted by at least one kind of an atom M selected from the group consisting of Be, Mg and Sr, in which the mayenite-type compound has an atom number ratio represented by M/(Ca+M) of from 0.01 to 0.50, and at least a part of free oxygen ions in a mayenite-type crystal structure are substituted by anions of an atom having electron affinity smaller than that of an oxygen atom.
摘要:
Provided is a method for preparing an electroconductive mayenite type compound with good properties readily and stably at low cost without need for expensive facilities, a reaction at high temperature and for a long period of time, or complicated control of reaction.A method for preparing an electroconductive mayenite type compound comprises a step of subjecting a precursor to heat treatment, wherein the precursor contains Ca and/or Sr, and Al, a molar ratio of (a total of CaO and SrO:Al2O3) is from (12.6:6.4) to (11.7:7.3) as calculated as oxides, a total content of CaO, SrO and Al2O3 in the precursor is at least 50 mol %, and the precursor is a vitreous or crystalline material; and the method comprises a step of mixing the precursor with a reducing agent and performing the heat treatment of holding the mixture at 600-1,415° C. in an inert gas or vacuum atmosphere with an oxygen partial pressure of at most 10 Pa.
摘要翻译:本发明提供一种低成本地容易且稳定地制备具有良好性能的导电性钙铝石型化合物的方法,而不需要昂贵的设备,高温反应和长时间的反应或复杂的反应控制。 制备导电性钙铝石型化合物的方法包括使前体进行热处理的步骤,其中前体含有Ca和/或Sr,和Al,(CaO和SrO:Al 2 O 3的总和)的摩尔比为( 12.6:6.4)至(11.7:7.3),前体中CaO,SrO和Al2O3的总含量为至少50摩尔%,前体为玻璃态或结晶性材料; 该方法包括将前体与还原剂混合并在氧分压至多10Pa的惰性气体或真空气氛中进行600-1,415℃保持混合物的热处理的步骤。
摘要:
In a solid solution system of Al2O3 and CAO or SrO, it has been difficult to obtain a material having a high electrical conductivity (>10−4 S·cm−) at room temperature. A compound is provided in which electrons at a high concentration are introduced into a 12CaO.7Al2O3 compound, a 12SrO.7Al2O3 compound, or a mixed crystal compound containing 12CaO.7Al2O3 and 12SrO.7Al2O3. The compound formed by substituting all the free oxygen ions with electrons is regarded as an electride compound in which [Ca24Al28O64]4+(4e−) or [Sr24Al28O64]4+(4e−) serves as a cation and electrons serve as anions. When a single crystal or a hydrostatic pressure press molded material of a fine powder thereof is held at approximately 700° C. in an alkaline metal vapor or an alkaline earth metal vapor, melt of a hydrostatic pressure press molded material of a powder is held at approximately 1,600° C. in a carbon crucible, followed by slow cooling for solidification, or a thin film of the compound held at approximately 600° C. is implanted with rare gas ions, a great number of the free oxygen ions can be substituted with electrons.
摘要翻译:在Al 2 N 3 O 3和CAO或SrO的固溶体系中,难以获得具有高导电性的材料(> 10 -4 SUP> S.cm SUP>)在室温下。 提供了一种化合物,其中将高浓度的电子引入12CaO7Al 2 O 3 O 3化合物,12SrO·7H 2 O 2 或者含有12CaO.7Al 2 O 3 3和12SrO 7 Al 2 O 3的混合晶体化合物, SUB> 3 SUB>。 通过用电子代替全部游离氧离子而形成的化合物被认为是电化学化合物,其中[Ca 2 H 12 O 12 O 64] (4e-sup) - 或[Sr 2 O 2] 28 O 64] SUP + 4 +(4e - - )用作阳离子,电子用作阴离子。 当在碱金属蒸气或碱土金属蒸气中将其细粉末的单晶或静水压成型材料保持在约700℃时,将粉末的流体静压加压成型材料的熔体保持在 在碳坩埚中约1600℃,然后缓慢冷却固化,或者在约600℃保持的化合物薄膜注入稀有气体离子,大量的游离氧离子可被 电子。
摘要:
Catalyst for steam cracking reactions consisting of pure mayenite having the general formula:12CaO.7Al2O3having an X-ray diffraction spectrum as indicated in Table I, obtained with a preparation process comprising the following steps: dissolution of salts containing calcium and aluminum with water; completing of the dissolved salts by means of polyfunctional organic hydroxyacids; drying of the solution resulting from the completing in order to obtain a solid precursor product; calcination of the solid precursor product at a temperature ranging from 1300 to 1400null C. for at least two hours.
摘要翻译:用于蒸汽裂解反应的催化剂,其由具有以下通式的纯钙铝石组成:具有表C所示的X射线衍射光谱的12CaO.7Al 2 O 3,其制备方法包括以下步骤:用水溶解含钙和铝的盐; 通过多官能有机羟基酸完成溶解的盐; 干燥由此完成的溶液,以获得固体前体产物; 在1300〜1400℃的温度下煅烧固体前体产物至少2小时。
摘要:
The present invention provides a 12CaO.7Al2O3 compound containing an O2null ion radical and/or an Onull ion radical in a high concentration of 1020 cmnull3 or more. This compound can be used as an oxidization catalyst, antibacterial agent, ion conductor, or electrode material for solid-oxide fuel cells.
摘要翻译:本发明提供了一种含有高浓度为1020cm -3以上的O-离子基团和/或O-离子基团的12CaO·7H 2 O 3化合物。 该化合物可以用作固体氧化物燃料电池的氧化催化剂,抗菌剂,离子导体或电极材料。