Abstract:
The present invention describes a generic methodology to formulate a composite solid useful for catalyzing variety of reactions, the present invention in particular relates to a heterogeneous catalyst as a formulation constituting a solid support having deposited thereon a catalytically active material, which is practically insoluble in variety of liquid media, the said insoluble material is constructed from secondary building blocks derived from suitable organometallic active components and the organometallic active component is molecularly modified so as to introduce two or more negatively charged functional groups, these molecularly modified organometallic components upon interaction with salts of Ca 2+ , Sr 2+ and Ba 2+ , provide practically insoluble solid material and the invention further ascertains various ways of formulating organometallic active material on as solid support as a solid catalyst, the methodology is suitable for preparation of wide variety of catalysts having applications in catalyzing diverse reactions in polar and nonpolar reaction media and the overall integrity of the formulation as a solid material in a liquid phase provides easy catalyst and product separation.
Abstract translation:本发明描述了一种用于制备可用于催化多种反应的复合固体的通用方法,本发明特别涉及一种作为构成固体载体的制剂的非均相催化剂,其上沉积有催化活性材料,其实际上不溶于多种 所述不溶性材料由衍生自合适的有机金属活性组分的二级结构单元构成,并且有机金属活性组分被分子修饰,以便引入两个或多个带负电荷的官能团,这些分子改性的有机金属组分与 Ca 2+,Sr 2+和Ba 2+提供几乎不溶的固体材料,本发明进一步确定了作为固体催化剂配制作为固体载体的有机金属活性材料的各种方式,该方法适用于制备 各种各样的催化剂具有a 在极性和非极性反应介质中催化多种反应的应用和作为液相中固体物质的配方的总体完整性提供了易于催化剂和产物分离。
Abstract:
This invention provides a cobalt-containing catalyst precursor for the preparation of a catalyst for catalytic hydrotreatment of hydrocarbonaceous feedstocks, and for a method of making same. The cobalt containing precursor is characterised by its colour which is defined by having reflectance maxima between 460 nm and 500 nm and between 660 nm and 690 nm when subjected to Ultraviolet-visible (UV-vis) Electromagnetic Radiation. The catalyst may be prepared by using a combined volatile content reduction-sulfurising step. The catalyst may contain one or more metals selected from Group VIB and Group VIII of the Periodic Table.
Abstract:
A catalyst and process by which an epoxy compound can be produced in high yield while improving the degree of effective utilization of an oxidizing agent. The catalyst, which is for producing an epoxy compound by oxidizing a compound having at least one ethylenic double bond with an oxidizing agent, has a two-defect and/or three-defect structural part and comprises: (A1) a heteropolyoxometalate anion having a heteroatom which is silicon and a polyatom; and (E1) at least one element which is different from the polyatom and is selected from the group consisting of vanadium, tantalum, niobium, antimony, bismuth, chromium, molybdenum, selenium, tellurium, rhenium, cobalt, nickel, ruthenium, rhodium, palladium, osmium, platinum, iridium, silver, gold, zinc, aluminum, gallium, indium, scandium, yttrium, titanium, zirconium, hafnium, germanium, tin, and lanthanides.
Abstract:
The process of preparing geminal dihydroperoxy alkyl peroxides and 1,1-dihydroperoxydialkyl peroxides, which comprises reacting an aqueous composition comprising a ketone with hydrogen peroxide in the presence of a heteropolyacid.
Abstract:
A catalyst for acetic acid production which comprises as essential ingredients (a) palladium and (b) at least one compound selected among heteropolyacids and salts thereof and further contains (c) vanadium and/or molybdenum element in a specific proportion. Using thsi catalyst, acetic acid is produced from ethylene and oxygen through a vapor-phase one-stage reaction.
Abstract:
The present invention pertains to a process for sulphiding a catalyst composition comprising at least one hydrogenation metal component of Group VI and/or group VIII of the Periodic Table, and an S-containing organic additive wherein the catalyst composition is contacted in two steps with hydrogen and a sulphur-containing compound in the gaseous phase, with the first step being performed at a temperature which is lower than that of the second step. Catalysts sulphided by the process according to the invention show a higher activity than the same catalysts which have been sulphided in a one-step process. It is preferred to carry out the process according to the invention ex situ , where it solves the problem of difficult start-up and the formation of undesirable side products in the hydrotreating unit. The S-containing organic additive preferably is a mercapto-compound, more preferably a mercaptocarboxylic acid represented by the general formula HS-R1-COOR, wherein R1 stands for a divalent hydrocarbon group with 1-10 carbon atoms and R stands for a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a linear or branched alkyl group having 1 to 10 carbon atoms.
Abstract:
The present invention pertains to a process for sulphiding a catalyst composition comprising at least one hydrogenation metal component of Group VI and/or Group VIII of the Periodic Table, and an S-containing organic additive wherein the catalyst composition is contacted with hydrogen and a sulphur-containing compound in the gaseous phase, characterised in that the process is carried out ex situ . By carrying out the process ex situ , the formation of undesirable side compounds in the hydrotreating unit is prevented. Additionally, the reactor suffers less downtime, and the start-up of the reactor may be simplified. The S-containing organic additive preferably is a mercapto-compound, more preferably a mercaptocarboxylic acid represented by the general formula HS-R1-COOR, wherein R1 stands for a divalent hydrocarbon group with 1-10 carbon atoms and R stands for a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a linear or branched alkyl group having 1 to 10 carbon atoms.
Abstract:
This invention relates to a catalyst composition comprising a heteropoly acid or a partial acid salt thereof on a silica support, characterised in that the alkali metal content of the silica support is no more than 150 ppm. The alkali metal content of the silica can be reduced by pretreating the support by acid washing. The catalyst can be used in olefin hydration and the preparation of esters from reaction of olefins and carboxylic acids.
Abstract:
A supported catalyst comprising a support, an anchoring agent such as an isopoly-oxymetal anion or oxometal salt thereof, and a metal complex which is useful in a wide variety of organic reactions, especially the hydrogenation of substituted alpha , beta unsaturated acids and esters, is provided. Various methods of preparing the supported catalyst of the present invention is also disclosed.
Abstract:
Heterogeneous catalysts of mixed-metal compounds of oxygenated acids, the metal comprising Ce, the vanadyl group, and groups (4 and 14) of the periodic table of the elements and the oxygenated acids being selected from acids of groups (6 and 15) and the vanadyl group. Said catalysts may include free acid -OH groups, or groups wherein the H atom is replaced by organic groups conferring to the catalysts a pillared structure. Said catalysts may be crystalline, amorphous or pellicular. Method of preparation of the catalysts is whereby the halide or oxyhalide of one or more metals from Ce, the vanadyl group, and groups (4 and 14) is brought together in a solution with a sodium salt of the oxyanion of one or more elements of groups (6 and 15), until a gel (G) or precipitate (P) has completely formed. The gel or precipitate is then separated, washed and dried to give an amorphous catalyst. Alternatively, the gel may be further treated by refluxing in an acid solution to obtain the crystalline form of the catalyst. Also described is a process for the oxidation of an olefin into an epoxide or diol, or a ketone to an ester or a lactone by reaction with hydrogen peroxide in the presence of one of the above-mentioned catalysts.