摘要:
The present invention relates to hierarchical structured nanotubes, to a method for preparing the same and to an application for the same, wherein the nanotubes include a plurality of connecting nanotubes for constituting a three-dimensional multi-dendrite morphology; and the method includes the following steps: (A) providing a polymer template including a plurality of organic nanowires; (B) forming an inorganic layer on the surface of the organic nanowires in the polymer template; and (C) performing a heat treatment on the polymer template having the inorganic layer on the surface so that partial atoms of the organic nanowires enter the inorganic layer.
摘要:
The present method describes the absorbing and desorbing of a gaseous reactant on a solid reactant. The solid reactant is an ammonia salt selected from the group consisting of alkali ammonium salts, alkali ammonium earth salts or a combination thereof.
摘要:
A process for depositing nanostructured material onto a particulate substrate material comprising the steps of: a) preparing a precursor material; b) forming an atomised dispersion containing nanophased material when subjecting said precursor material to elevated temperature; and c) contacting the atomised dispersion with the substrate material to deposit the nanophased material on the substrate material. The substrate material is in mobile and particulate form for contacting step (c). An apparatus for carrying out the process is also disclosed.
摘要:
Catalysts for the oxychlorination of ethylene to 1.2-dichloroethane, in form of hollow granules having definite geometrical configuration and pore volume distribution with at least 20% of the total volume formed of macropores wherein the diameter of the pores at the maximum of the macropore distribution curve is higher than 800 nm and up to 1500 nm.
摘要:
Promoters are described for vanadium-based catalysts used in the (co)polymerization of olefins and, in particular, in the production of ethylene/propylene (EPR) or ethylene/propylene/diene (EPDM) elastomeric copolymers. The promoters of the present invention belong to the group of compounds having general formula I: wherein: “X” represents a (—CO—) carbonyl or (—SO2—) sulfonyl group; “n” is 0 or 1; R′ is an alkyl or alkylaryl group having from 1 to 20 carbon atoms; R″=R′, H.
摘要:
A catalyst for use in the hydrochlorination of methanol which comprises an η-alumina doped with an alkali metal salt, e.g. caesium chloride, in order to reduce selectivity to demethyl ether and to delay the onset of coking on the catalyst in use.
摘要:
This invention is a process for producing vinyl chloride from an ethylene-containing feed, oxygen, and a chlorine source in the presence of a catalyst. The process permits direct production of vinyl chloride in a single reactor system, and further permits ethane to be used as the C2 hydrocarbon feed with recycle of ethylene from the product stream to constitute the ethylene specified for the feed. This invention in another aspect concerns also a composition of matter, and a method for making the composition, wherein the composition is useful as a catalyst for the vinyl chloride process. The composition comprises a rare earth-containing material, with the proviso that the catalyst prepared therefrom is substantially free of iron and copper and with the further proviso that when cerium is present the catalyst further comprises at least one more rare earth element other than cerium.
摘要翻译:本发明是在催化剂存在下由含乙烯的进料,氧气和氯源生产氯乙烯的方法。 该方法允许在单个反应器系统中直接生产氯乙烯,并且进一步允许乙烷用作C 2 O 2烃进料,其中乙烯从产物流中再循环以构成针对进料的乙烯 。 在另一方面,本发明还涉及一种物质组合物和一种制备该组合物的方法,其中该组合物可用作氯乙烯方法的催化剂。 所述组合物包含含稀土材料,条件是由其制备的催化剂基本上不含铁和铜,另外条件是当存在铈时,催化剂还包含至少一种除铈以外的至少一种稀土元素。
摘要:
An active catalyst in the polymerization of alpha-olefins is obtained by:(i) bringing a dialkyl magnesium, or an alkyl magnesium halide into contact with a silicon or tin halide, in solution in an inert organic solvent, until a granular solid precipitates off;(ii) suspending said solid precipitate in an inert organic solvent and bringing it into contact with a compound which can be defined by the formula: ##STR1## wherein M represents a metal from Group IVB of the Periodic Table of Elements, and each R and C.sub.p has the meaning as reported in the disclosure, in order to form a granular solid catalyst; and(iii) recovering said solid catalyst from the resulting suspension.
摘要:
A process for the production of monosilanes from the high-boiling residue resulting from the reaction of hydrogen chloride with silicon metalloid in a process typically referred to as the "direct process." The process comprises contacting a high-boiling residue resulting from the reaction of hydrogen chloride and silicon metalloid, with hydrogen gas in the presence of a catalytic amount of aluminum trichloride effective in promoting conversion of the high-boiling residue to monosilanes. The present process results in conversion of the high-boiling residue to monosilanes. At least a portion of the aluminum trichloride catalyst required for conduct of the process may be formed in situ during conduct of the direct process and isolation of the high-boiling residue.
摘要:
Provided is a process for producing acetic acid by carrying out reaction of methyl formate in the presence of a Group VIII metal catalyst, at least one iodine compound, acetic acid and carbon monoxide, continuously drawing a reaction mixture from a reactor, introducing the reaction mixture into a flash distillation zone, separating an evaporated component and an unevaporated component, recycling the unevaporated component to the reaction zone, and obtaining acetic acid from the evaporated component, wherein formic acid and methyl formate are allowed to coexist in the flash distillation zone and/or the recycling zone. According to this process, no loss of methyl formate and formic acid is caused and only methyl formate is used as a starting material with basically requiring no supply of carbon monoxide.