Abstract:
The reactive distillation is carried out in a column (1) with a packing (2) which is at least partly designed as a catalyst carrier (23). Fluids (3, 4) which form two phases of different densities flow through the packing. An internal volume flow (300) is set for the denser fluid (3), the value of which lies in an interval (I) about a distinguished value (a), with this value being associated with a dwell time distribution (32) of the denser fluid: For the distinguished value the variance (s) of the dwell time distributionnullas a function of the internal volume flownulltakes on a minimum; and at the boundaries of the named interval the internal volume flow does not differ from the distinguished value by more than 30%, preferably by more than 10%.
Abstract:
A combustion catalyst coating (36) applied to the surface of a ceramic thermal barrier coating (34) which is supported by a metal substrate (32). The columnar-grained microstructure of the thermal barrier coating surface provides the necessary surface area for interaction of the catalyst and a fuel-air mixture in a catalytic combustor of a gas turbine engine. The temperature gradient developed across the thermal barrier coating protects the underlying metal substrate from a high temperature combustion process occurring at the catalyst surface. The thermal barrier coating deposition process may be controlled to form a columnar grained microstructure having a plurality of primary columns each with a plurality of secondary and tertiary branches in order to achieve a desired specific surface area for receiving the catalyst coating.
Abstract:
Disclosed is a new integrated flameless distributed combustion-membrane steam reforming (FDC-MSR) reactor apparatus for steam reforming of any vaporizable hydrocarbon to produce H2 and CO2, with minimal CO, and virtually no CO in the H2 stream. The flameless distributed combustion drives the steam reforming reaction which provides great improvements in heat exchange efficiency and load following capabilities. A further embodiment of the invention involves a zero emission hybrid power system wherein the produced hydrogen is used to power a high-pressure internally manifolded molten carbonate fuel cell. In addition, the design of the FDC-SMR powered fuel cell makes it possible to capture good concentrations of CO2 for sequestration or use in other processes.
Abstract:
The present invention includes a catalyst having a layered structure with, (1) a porous support, (2) a buffer layer, (3) an interfacial layer, and optionally (4) a catalyst layer. The invention also provides a process in which a reactant is converted to a product by passing through a reaction chamber containing the catalyst.
Abstract:
Modular, stackable, flow-through plate or channel reactor units for continuous, low temperature, catalytic reactions of two separate process reaction streams; typically the first is an exothermic combustion process and the second, an endothermic reforming process. Each reactor unit comprises two separate sets of flow channels or slot-type reaction zones formed in flow plates located between spaced, thin metal, highly heat-conductive metal foil or platelet separator walls, adjacent reactors in a stack including a common, medially located, bicatalytic separator plate, i.e., a separator plate having on opposed surfaces the same or different catalysts selected for the particular reaction taking place in the adjacent reactor zone. Each flow plate has a relieved medial area defining the reaction zone, the side walls of which are the catalyst coated separator platelets. A separator platelet thus separates two adjacent reaction zones, one on each side and functions to transfer heat from the combustion occurring at the catalyst surface in the combustion zone directly to the reforming catalyst coated on the opposed surface. The reaction zones may include structures such as grooved plates or packed spheres to direct the feedstock gases to the catalyst coated on the platelet surfaces. Support frames, gaskets, manifolding, insulating spacers, end plates and assembly hardware and methods are also disclosed. Multiple modular reactor units or cells may be stacked to provide a reactor of any desired throughput capacity and portability. The invention also comprises methods for the catalytic reforming of hydrocarbon fuels for the production of synthesis gas or hydrogen employing the bicatalytic reactor of the invention.
Abstract:
This invention relates generally to a method for producing composites of single-wall carbon nanotubes (SWNTs) and compositions thereof. In one embodiment, the present invention involves a method of producing a composite material that includes a matrix and a carbon nanotube material embedded within said matrix. In another embodiment, a method of producing a composite material containing carbon nanotube material is disclosed. This method includes the steps of preparing an assembly of a fibrous material; adding the carbon nanotube material to the fibrous material; and adding a matrix material precursor to the carbon nanotube material and the fibrous material.
Abstract:
A honeycomb body, in particular a catalyst carrier body, includes a carrier matrix shell for a carrier matrix formed of partially structured, layered and/or wound or folded metal sheets. The carrier matrix has a plurality of passages which are fluid-permeable and extend substantially parallel to a central longitudinal axis. The carrier matrix shell has at least two individual, smooth layers, preferably with substantially the same thickness, disposed concentrically relative to one another and at least two of the layers are adjacent one another. In addition to an improved ability to compensate for expansion of a thermal origin, the honeycomb body has vibration damping and sound-proofing qualities, resulting from the multi-layer structure of the carrier matrix shell.
Abstract:
An improved metal gas separation membrane for separating hydrogen from a gas steam includes a quantity of metal particles that are bonded together to form a porous body. The porous body may have a porosity that increases from a first surface to an opposite second surface and may additionally include a coating of ceramic particles on the first surface. The metal gas separation membrane may include a coating of a dense precious metal applied thereto that is permeable by hydrogen via chemisorption-dissociation-diffusion. The porous body may include a catalytic enhancement. Also disclosed are three gas separation modules that employ the metal gas separation membrane disposed within a core of the gas separation module for separating hydrogen from a gas stream. The gas separation membranes are each supported on a first mounting member and a second mounting member. The gas separation modules may also include a catalytic enhancement.
Abstract:
A method for the isomerization of a hydrocarbonic charge containing a substantial quantity of paraffin base hydrocarbons with 5 or 6 carbon atoms and a benzene content that is greater than or equal to 2% by weight, in which the charge to be treated passes, in the presence of hydrogen, at a total pressure greater than or equal to 10.105 Pa (10 bars) and at an average temperature ranging between 100 and 200null C., through at least one reactor (5) containing a catalyst. An adjunctive fluid is introduced in the upstream section of the reaction zone; a fluid that at 40null C. and under atmospheric pressure (1.0134.105 Pa), is in a gaseous phase and has a density that is less than or equal to that of the normal-pentane taken into account under the same conditions.
Abstract:
Catalyst compositions are provided that are useful in selectively removing carbon monoxide from a hydrogen-containing gas. These catalyst compositions preferably have the formula: nN/Ce1null(xnullynullz)AxAnullyAnullzO2nullnull, where A, Anull, Anull are independently selected from the group consisting of: Zr, Gd, La, Sc, Sr, Co, Cr, Fe, Mn, V, Ti, Cu and Ni; N is one or more members of the group consisting of: Pt, Pd, and Au; n is a weight percent between 0 and 25; x, y and z are independently 0 to 0.9; xnullynullz is 0.1 to 0.9; and null is a number which renders the composition charge neutral; or nN/(MOx)y(CeO2nullnull)1nully, where M is one or more members of the group selected from: Zr, Co, Cr, Fe, Mn, V, Ti, Ni and Cu; N is one or more members of the group selected from: Pt, Pd, and Au; n is a weight percent between 0 and 25; y is 0.1 to 0.9; and x and null make the compositions charge neutral.
Abstract translation:提供了可用于从含氢气体中选择性除去一氧化碳的催化剂组合物。 这些催化剂组合物优选具有下式:nN / Ce1-(x + y + z)AxA'yA''zO2-delta,其中A,A',A“独立地选自:Zr,Gd, La,Sc,Sr,Co,Cr,Fe,Mn,V,Ti,Cu和Ni; N是由Pt,Pd和Au组成的组中的一个或多个成员; n是0和25之间的重量百分比; x,y和z独立地为0〜0.9; x + y + z为0.1〜0.9; 和delta是使组成电荷中性的数字; 或nN /(MOx)y(CeO 2-δ)1-y,其中M是选自:Zr,Co,Cr,Fe,Mn,V,Ti,Ni和Cu中的一种或多种成员; N是选自以下的基团中的一个或多个成员:Pt,Pd和Au; n是0和25之间的重量百分比; y为0.1〜0.9; 并且x和δ使组合物充电成中性。