摘要:
A process for the preparation of a catalyst useful for conducting carbon monoxide hydrogenation reactions, especially Fischer-Tropsch reactions. The steps of the process begin with the activation, or reactivation, of a deactivated catalyst, or with the preparation and activation of a fresh catalyst. In accordance with the latter, the steps of the process comprise, first contacting, in one or more steps, a powder or preformed, particulate refractory inorganic support with a liquid, or solution in which there is dispersed or dissolved a compound, or salt of a catalytically active metal, or metals, to impregnate and deposit the metal, or metals, upon the support, or powder. The metal, or metals, impregnated support is calcined following each impregnation step to form oxides of the deposited metal, or metals. The calcined catalyst precursor is then treated with a solution of a chelating compound, preferably a poly- or multidentate chelating compound, sufficient to complex with, extract and remove a portion of the oxides of the metal, or metals. The catalyst is activated by reduction; suitably by contact with hydrogen. In the activation, or reactivation of a deactivated catalyst, the catalyst is first treated with the chelating compound to extract a portion of the oxides of the metal, or metals, and the catalyst is then reduced. In either event, the activated or reactivated catalyst has high activity, or high C5+ selectivity, or both high activity and C5+ selectivity in conducting carbon monoxide hydrogenation reactions. The productivity of the process is increased.
摘要:
A catalytic process development apparatus and method for simulating a commercial scale methanol and/or DME to propylene catalytic conversion system that includes a plurality of series-connected plug-flow reactors. The method involves simulating the operation of the series-connected plug-flow reactors by operating a series of multistage series-connected laboratory scale plug-flow reactors, the stages of which each containing a zeolite catalyst bed, each of the laboratory scale reactors corresponding to a separate one of the commercial scale series-connected reactors. Fresh feed, including methanol and/or DME, is supplied to the first of the laboratory scale reactor stages, and selected ones of steam, methanol and/or DME, contaminants and reaction products are supplied to selected ones of the laboratory scale reactor stages. The simulation is repeated at different sets of operating conditions and catalyst characteristics.
摘要:
An integrated coal-to-liquids process is provided to minimize carbon dioxide emissions and efficiently make use of carbon resources, by recovering carbon dioxide emissions from Coal-to-Liquids (CTL) facilities, using the recovered carbon dioxide in at least one carbonylation reaction step for converting ammonia to urea and then converting urea into dimethyl carbonate.
摘要:
A particulate, precalcined low silica content zirconia, especially one stabilizer with yttria, is useful as a catalyst support or as a heat transfer solids component for conducting chemical reactions at high temperature, in oxidizing, reducing or hydrothermal conditions, especially in syn gas operations. An admixture of precalcined particulate low silica content zirconia, particularly a low silica content yttria-stabilized zirconia, is employed in a preferred embodiment as a heat transfer solid, in concentrations ranging generally from about 10 wt. % to about 99.9 wt. % with a particulate catalyst notably a nickel-on-alumina catalyst, in concentration ranging generally from about 0. 1 wt. % to about 90 wt. %. Such an admixture provides a particularly useful catalytic contact mass in high temperature oxidizing, reducing and hydrothermal environments, notably in conducting synthesis gas generation operations. This type of bed promotes continuous, highly efficient heat and mass transfer within the reacting gas phase. The presence of the heat transfer solid as a bed component maintains excellent bed fluidization characteristics, suppressing the normal tendency of the catalyst to sinter or agglomerate; tendencies which promote defluidization of the bed. Moreover, the heat transfer particles of the bed are highly attrition resistant, and are chemically compatible with the catalyst particles of the admixture.
摘要:
A process utilizing a particulate catalyst, or particulate catalyst admixed with particulate heat transfer solids for conducting high temperature fluidized bed syn gas operations. Hydrogen and carbon monoxide are produced from a low molecular weight hydrocarbon by contact thereof, at high temperature in the presence of oxygen, or steam and oxygen, with a fluidized bed comprising said particulate solids. In one of its forms, barium hexaluminate is employed as a heat transfer solid, in concentrations ranging generally from about 10 wt. % to about 99.9 wt. %, in admixture with a particulate catalyst containing a metal, or metals, component catalytic for the production of hydrogen and carbon monoxide from low molecular weight hydrocarbons contacted with a fluidized bed of the catalyst at high temperature hydrothermal conditions. The catalyst, suitably one having a barium hexaluminate carrier component, is employed in concentration ranging generally from about 0.1 wt. % to about 90 wt. %. Such an admixture provides a particularly useful catalytic contact mass for conducting fluidized bed synthesis gas generation operations. This type of bed promotes continuous, highly efficient heat and mass transfer within the reacting gas phase. The presence of the catalyst having a barium hexaluminate carrier component, or barium hexaluminate heat transfer solid as a bed component maintains excellent bed fluidization characteristics, suppressing the normal tendency of the catalyst to sinter or agglomerate; tendencies which promote defluidization of the bed. Moreover, the heat transfer particles of the bed are highly attrition resistant, and are chemically compatible with the catalyst particles of the admixture.
摘要:
A copper promoted cobalt manganese spinel useful for Fischer-Tropsch synthesis of olefins and higher paraffins is prepared from an aqueous solution of cobalt and manganese salts of at least one alpha-hydroxy aliphatic carboxylic acid.
摘要:
A hydrogen regenerable hydrocarbon synthesis catalyst useful for preparing higher hydrocarbons from synthesis gas is prepared by depositing cobalt and ruthenium on a refractory carrier and oxidizing and reducing the catalytic metals to form a catalyst in which the cobalt and ruthenium are in intimate contact.
摘要:
This invention relates to a finely divided iron carbide-first row transition metal-based catalyst which is produced by a gas phase pyrolytic decomposition reaction driven by a laser. The catalysts may be used to produce various hydrocarbons, including olefins, from CO.sub.2 and H.sub.2.
摘要:
Slurried low initial surface area Fe--Co spinels, containing low levels of cobalt, which are fully reduced/carburized ex situ, provide exceptionally high activity and selectivity in the conversion of CO/H.sub.2 to alpha olefins in a slurry type process. These slurried unsupported iron-cobalt catalysts maintain good activity and selectivity under low pressure reaction conditions.
摘要翻译:含有低水平钴的低含量的初始表面积Fe-Co尖晶石,其在原位完全还原/渗碳下提供了在浆料类型方法中将CO / H 2转化为α-烯烃的异常高的活性和选择性。 这些浆状未负载的铁 - 钴催化剂在低压反应条件下保持良好的活性和选择性。
摘要:
Slurried high surface area Fe-Co spinels which are fully reduced/carburized provide exceptionally high activity and selectivity in the conversion of CO/H.sub.2 to alpha-olefins. These iron-cobalt catalysts maintain good activity and selectivity under low pressure reaction conditions.