摘要:
The invention relates to a catalyst on support for the selective oxidation of sulfur-containing compounds to elemental sulfur, comprising at least one catalytically active material applied to a support material, this catalyst being obtainable by applying the catalytically active material to a support material which comprises at least one alkali metal promotor.
摘要:
The present invention is directed to a process and a reactor for removing organic compounds from gas flows, in which process the said gas flow is passed through a first compartment of a multi-compartment reactor, which reactor comprises at least one first compartment and at least one second compartment, which first and second compartments are in heat exchanging relationship with each other through a joint, gas-tight wall, and in which first compartment the gas flow is heated by heat exchange with the said second compartment, passing the heated gas flow to the second compartment, further heating the gas flow entering the second compartment either by adding additional combustible gas or electric heating, and passing the heated gas through the second compartment over a catalytic oxidation catalyst to combust the organic compounds, whereby both the first and the second compartment are filled with porous sintered metal material, which is in heat exchanging relationship to the said joint wall, whereby the metal material in the second compartment is provided with the said oxidation catalyst.
摘要:
The invention is directed to a process for producing hydrogen from methanol, comprising providing at least one flow of methanol and (1) catalytically converting part of the methanol or a fuel gas with air oxygen to carbon dioxide and water, while generating heat and (2) catalytically converting the methanol or the remaining part of the methanol at elevated temperature to hydrogen and carbon monoxide, followed by conversion of the carbon monoxide with water to hydrogen and carbon dioxide, wherein the heat generated in step (1) is sufficient to produce the elevated temperature required in step (2), wherein both steps (1) and (2) are carried out in a bed of sintered metal particles, the bed of sintered metal in step (2) having a surface that is catalytically active for the conversion of methanol to hydrogen, and wherein the beds of sintered metal particles are in heat exchanging relationship.
摘要:
Synthetic clay minerals are made up of elementary three-layer platelets consisting of a central layer of octahedrally oxygen-surrounded metal ions (octahedron layer), which layer is surrounded by two tetrahedrally surrounded, silicon atom-containing layers (tetrahedron layers), a number of such elementary platelets being optionally stacked. The dimensions of the clay platelets vary from 0.01 &mgr;m to 1 &mgr;m, the number of the stacked elementary three-layer platelets varies from on average one platelet to twenty platelets, while in the octahedron layer at most 30 at. % of the metal ions has been replaced by ions of a lower valency and in the tetrahedron layers at most 15 at. % of the silicon ions has been replaced by ions of a lower valency, such a replacement having taken place in at least one of these layers and these layers having a deficiency of positive charge because of the replacement. They are prepared by bringing the pH of an aqueous liquid containing the components of the clay to a value of 3-9 and the temperature of the liquid to a value of from 60 to 350° C. and maintaining it at said value for the time required for the reaction, the pH being maintained at a value within said range.
摘要:
A process for the selective oxidation of hydrogen sulphide in a hydrogen sulphide containing feed gas to elemental sulphur, wherein the hydrogen sulphide containing feed gas (3), an inert liquid medium (5), and a molecular-oxygen containing gas (4) are supplied to a reaction zone (1) comprising at least one catalytic zone (2) comprising an oxidation catalyst to form elemental sulphur and a gaseous stream depleted in hydrogen sulphide (8), in which process the oxidation catalyst of each catalytic zone (2) is contacted with hydrogen sulphide and/or molecular-oxygen in the presence of inert liquid medium at a temperature in the range of from 120 to 160° C., under such conditions that the elemental sulphur formed is essentially in liquid form and is removed from the reaction zone with the inert liquid medium.
摘要:
The present invention is directed to a process and a reactor for removing organic compounds from gas flows, in which process the said gas flow is passed through a first compartment of a multi-compartment reactor, which reactor comprises at least one first compartment and at least one second compartment, which first and second compartments are in heat exchanging relationship with each other through a joint, gas-tight wall, and in which first compartment the gas flow is heated by heat exchange with the said second compartment, passing the heated gas flow to the second compartment, further heating the gas flow entering the second compartment either by adding additional combustible gas or electric heating, and passing the heated gas through the second compartment over a catalytic oxidation catalyst to combust the organic compounds, whereby both the first and the second compartment are filled with porous sintered metal material, which is in heat exchanging relationship to the said joint wall, whereby the metal material in the second compartment is provided with the said oxidation catalyst.
摘要:
The invention provides a catalyst, a method for making the catalyst and a method for using the catalyst to promote the selective oxidation of hydrogen sulfide into elemental sulfur. The catalyst may be prepared by contacting a catalyst support, such as silica, with a mixed oxide having atomically mixed iron ions and zinc ions, to produce a support material impregnated with a mixed oxide having atomically mixed iron ions and zinc ions in an oxidic lattice. This impregnated catalyst support is then dried and calcined, preferably with chloride ions present, to produce a catalyst of an iron and zinc oxide mixture supported on silica. It has been found that when chloride is added to the impregnated catalyst support prior to calcination and drying, the sintering of the iron and zinc can be controlled more easily and the formation of iron and zinc oxide is promoted. It has also been found that the catalyst of the invention exhibits improved selectivity characteristics when compared to a catalyst prepared without the chloride.
摘要:
A process is provided for the removal of metal carbonyl from gaseous streams in the presence of hydrogen sulphide and/or water using a hydrophobic porous adsorbent with an accessible pore volume for pore sizes between 0.55 and 4 nm of at least 0.005 ml/g.
摘要:
The invention relates to a heterogeneous vanadium-phosphorus oxide catalyst system for the selective oxidation of hydrocarbons, which may or may not be saturated, comprising a support based on one or more metal oxides, and vanadium-phosphorus oxide in an amount of from 0.01 to 45 wt. %, based on the weight of the catalyst and calculated as (VO).sub.2 P.sub.2 O.sub.7, to a process for the selective oxidation of an organic compound in the presence of a vanadium-phosphorus oxide catalyst, which process comprises an oxidation and a reduction phase, wherein a hydrocarbon is contacted with said catalyst in the reduction phase and in oxidized or non-oxidized form is adsorbed to the catalyst, whereafter the thus loaded catalyst is brought into the oxidation phase, the desired product is formed in the presence of gaseous oxygen and subsequently separated.
摘要翻译:本发明涉及用于选择性氧化烃的非均相钒 - 磷氧化物催化剂体系,其可以饱和或不饱和,其包含基于一种或多种金属氧化物的载体,以及含量为0.01〜 45重量% %,基于催化剂的重量计算为(VO)2 P 2 O 7,在钒 - 磷氧化物催化剂存在下选择性氧化有机化合物的方法,该方法包括氧化还原相,其中 烃在还原阶段与所述催化剂接触,氧化或非氧化形式被吸附到催化剂上,然后使如此负载的催化剂进入氧化阶段,在气态氧存在下形成所需产物 分开
摘要:
The invention is directed to a process for producing hydrogen from methanol, comprising providing at least one flow of methanol and (1) catalytically converting part of the methanol or a fuel gas with air oxygen to carbon dioxide and water, while generating heat and (2) catalytically converting the methanol or the remaining part of the methanol at elevated temperature to hydrogen and carbon monoxide, followed by conversion of the carbon monoxide with water to hydrogen and carbon dioxide, wherein the heat generated in step (1) is sufficient to produce the elevated temperature required in step (2), wherein both steps (1) and (2) are carried out in a bed of sintered metal particles, the bed of sintered metal in step (2) having a surface that is catalytically active for the conversion of methanol to hydrogen, and wherein the beds of sintered metal particles are in heat exchanging relationship.