摘要:
Large zeolite and zeolite-like molecular sieve crystals of from 3 to 500 .mu.m are fixed on moldings by a process in which an adhesion promoter is used or the moldings are softened.
摘要:
A Phillips catalyst for the polymerization of .alpha.-olefins, containing, as a catalytically active component, at least one chromium(III) compound on a silicon aluminum phosphate carrier of the general formula (I)(Si.sub.x Al.sub.y P.sub.z)O.sub.2 (I)where x is from 0.05 to 0.5 and y and z are each from 0.1 to 1.0, exhibits in particular high productivity and is preferably used for the preparation of homo- and copolymers of ethylene.
摘要:
A process for preparing essentially alkali-free titanium silicate crystals having a zeolite structure, comprises reacting an SiO.sub.2 -containing mixture of water, a tetraalkylammonium compound, a titanium component and ammonia in the absence of a metal hydroxide or salt under hydrothermal conditions in a molar ratio of ammonia/tetraalkylammonium of from 3:1 to 200:1.
摘要:
Acetaldehyde is removed from C.sub.3 -C.sub.15 hydrocarbons by contacting the hydrocarbon or a hydrocarbon mixture in liquid phase with a zeolite whose pores have a width which is greater than 0.3 nm and up to 0.75 nm.
摘要:
In apparatuses of the generic type, single point modules are provided which can transfer only the transport wagons arriving from one point branch optionally into one of the two other point branches. It is achieved by the development of the point modules according to the invention as T-shaped double point modules (40) that each point branch (42, 44, 46) can be connected optionally to one of the other two point branches, which results in a construction of a network transport path system of a simpler construction which requires less space and provides a better overview. For narrowing the spacing of parallel transport path routes (76, 80), point modules (72) are proposed whose branch angle is less than 90.degree., preferably 45.degree.. Apparatus with flexible transport path and assembly systems in industrial production plants are a preferred application sector.
摘要:
A coating for a CoCrMo substrate including a first layer located directly on the substrate and including Ta(CoCrMo)0.5-2.0, a second layer located directly on the first layer and including tantalum, a third layer located directly on the second layer and including tantalum carbide, and a fourth layer located directly on the third layer and including diamond-like carbon (DLC).
摘要:
The present invention relates to an organotemplate-free synthetic process for the production of a zeolitic material having a BEA framework structure comprising YO2 and optionally comprising X2O3, wherein said process comprises the steps of (1) preparing a mixture comprising seed crystals and at least one source for YO2; and (2) crystallizing the mixture; wherein Y is a tetravalent element, and X is a trivalent element, wherein the zeolitic material optionally comprises at least one alkali metal M, wherein when the BEA framework additionally comprises X2O3, the mixture according to step (1) comprises at least one source for X2O3, and wherein the seed crystals comprise zeolitic material having a BEA framework structure, preferably zeolite Beta.
摘要翻译:本发明涉及一种用于生产具有包含YO 2和任选地包含X 2 O 3的BEA骨架结构的沸石材料的无机模板合成方法,其中所述方法包括以下步骤:(1)制备包含晶种和至少一种 来源为YO2; 和(2)使混合物结晶; 其中Y是四价元素,X是三价元素,其中沸石材料任选地包含至少一种碱金属M,其中当BEA骨架另外包含X 2 O 3时,根据步骤(1)的混合物包含至少一种源 X 2 O 3,并且其中所述晶种包含具有BEA骨架结构的沸石材料,优选沸石β。
摘要:
The present invention relates to an organotemplate-free synthetic process for the production of a zeolitic material having a BEA framework structure comprising YO2 and optionally comprising X2O3, wherein said process comprises the steps of (1) preparing a mixture comprising seed crystals and at least one source for YO2; and (2) crystallizing the mixture; wherein Y is a tetravalent element, and X is a trivalent element, wherein the zeolitic material optionally comprises at least one alkali metal M, wherein when the BEA framework additionally comprises X2O3; the mixture according to step (1) comprises at least one source for X2O3, and wherein the seed crystals comprise zeolitic material having a BEA framework structure, preferably zeolite Beta.
摘要翻译:本发明涉及一种用于生产具有包含YO 2和任选地包含X 2 O 3的BEA骨架结构的沸石材料的无机模板合成方法,其中所述方法包括以下步骤:(1)制备包含晶种和至少一种 来源为YO2; 和(2)使混合物结晶; 其中Y是四价元素,X是三价元素,其中沸石材料任选地包含至少一种碱金属M,其中当BEA骨架另外包含X 2 O 3时; 根据步骤(1)的混合物包含至少一种X 2 O 3源,并且其中所述晶种包含具有BEA骨架结构的沸石材料,优选沸石β。
摘要:
An illumination system and a projection objective of a mask inspection apparatus are provided. During operation of the mask inspection apparatus, the illumination system illuminates a mask with an illumination bundle of rays having a centroid ray that has a direction dependent on the location of the incidence of the illumination bundle of rays on the mask.
摘要:
The present invention relates to a process for the preparation of a silicate comprising at least silicon and oxygen, comprising (1) mixing of silicon dioxide and/or of a silicon dioxide precursor with an aqueous solution comprising at least one tetraalkylammonium compound comprising R1R2R3R4N+ and at least one base, wherein R1 and R2 are methyl and both R3 and R4 are n-propyl; (2) heating of the colloidal solution obtained according to (1) to a temperature in the range of from greater than the boiling point of the colloidal solution under the chosen pressure to 180° C. at atmospheric pressure to give a suspension comprising at least one silicate, wherein the silicate comprising at least silicon and oxygen is added as a crystallization auxiliary in (1).