Abstract:
A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor null. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.
Abstract:
Embodiments include a method and apparatus for converting a hydrocarbon and oxygen feed stream to a product stream such as syngas, including multiple serially aligned reaction zones and multiple hydrocarbon feeds. The first reaction zone catalyzes the net partial oxidation of the feed hydrocarbon. The subsequent zones catalyze reactions such as the stream or dry reforming of hydrocarbons or the water gas shift reaction, depending on the stream composition in the vicinity of the zone, and the desired product stream composition.
Abstract:
A family of supported hexagonal phase mixed metal oxide catalysts are disclosed that have the general formula M2.5LnRh6O13 (expressed as atomic ratios), wherein M refers to Group II elements such as Mg, Ca, Ba, Sr and Be or a Group VIII transition metal that can exist in a null2 oxidation state, such as Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Nb, Pd, Cd and Ta. Ln refers to the rare earth lanthanide group of elements, such as La, Yb, Sm and Ce. This family of catalysts demonstrate unexpected activity for efficiently catalyzing the net partial oxidation of methane in a short contact time reactor, with high selectivities for H2 product.
Abstract:
The present invention is directed towards a process that allows for the adjustment of hydrogen concentration in a syngas product or Fischer-Tropsch feedstock stream. In particular, the invention is identified as an improved process for producing syngas comprising a secondary chemical reaction, preferably a water gas shift reaction, that allows for the adjustment of the hydrogen concentration in a syngas product stream. Ultimately, the present invention is for an improved process for converting hydrocarbon-containing gas to liquid hydrocarbons.
Abstract:
A process and system for producing industrial-scale quantities of highly dispersed, thermally stable catalysts is disclosed. The process, which may be continuous production or batch production, includes mixing together the desired catalyst precursor materials, a combustible organic material and a solvent; evaporating the solvent, combusting the catalyst intermediate; and shaping final catalyst.
Abstract:
Controlled pore structure catalysts are disclosed that are active for catalyzing the partial oxidation of methane to CO and H2 and, advantageously, are capable of initiating the reaction without the need for an additional ignition source. A preferred catalyst comprises rhodium and samarium supported on an alumina or modified alumina support having certain surface area, pore volume, pore size and metal dispersion characteristics that permit light-off of the reaction at temperatures below 500null C. and with little or no use of an ignition agent. A method of partially oxidizing a light hydrocarbon to form synthesis gas, and a method of enhancing low-temperature light-off of the process are also described.
Abstract:
The present invention is an improvement in the preparation of liquid hydrocarbons from natural gas/methane, oxygen and/or steam. In particular, the present invention relates to processes for the production of synthesis gas, reducing the oxygen concentration from the synthesis gas, and the production of liquid hydrocarbons using the oxygen reduced synthesis gas as a feedstock. More particularly, the present invention described herein identifies catalyst compositions, apparatus and methods of using such catalysts and apparatus for preparing liquid hydrocarbons via oxygen reduced synthesis gas all in accordance with the present invention.
Abstract:
Catalysts comprising promoted cobalt-chromium oxide disposed on a lanthanide coated refractory support that are active for catalyzing the net partial oxidation of methane or natural gas to products containing CO and H2 are disclosed, along with short contact time processes employing the new catalysts for producing synthesis gas. Preferred promoters are rhodium and cerium, and a preferred lanthanide coating material is ytterbium.
Abstract:
Combustion dispersed metal-metal oxide catalysts that are highly active for catalyzing the net partial oxidation of methane to CO and H2 are disclosed, along with their manner of making and processes for producing synthesis gas employing the new catalysts. A preferred catalyst comprises rhodium nanoparticles, with or without a rare earth promoter, that is deposited on null-alumina by combusting a mixture of catalyst precursor materials and a flammable organic compound. In a preferred syngas production process a stream of reactant gas mixture containing methane and O2 is passed over the catalyst in a short contact time reactor to efficiently produce a mixture of carbon monoxide and hydrogen at superatmospheric pressures.
Abstract:
A porous catalyst support having an increased average pore size is produced from a mixed metal oxide material. In accordance with one embodiment, a method for preparing a mixed metal oxide material includes providing a mixed metal oxide precursor containing at least two metals, calcining the mixed metal oxide precursor at a temperature sufficient to form a thermally and mechanically stable mixed metal oxide material, and leaching the mixed metal oxide material in a leach solution with a constituent that dissolves one metal oxide. Preferably, the calcination temperature is approximately between 300null C. and 1300null C. The leaching constituent may be chosen from the group including acidic solutions of HCl, HNO3, H2SO4, H3PO3, and their combinations, or basic solutions of NH3, NaOH, KOH, and their combinations.
Abstract translation:具有增加的平均孔径的多孔催化剂载体由混合金属氧化物材料制成。 根据一个实施方案,制备混合金属氧化物材料的方法包括提供含有至少两种金属的混合金属氧化物前体,在足以形成热和机械稳定的混合金属氧化物材料的温度下煅烧所述混合金属氧化物前体, 并且将所述混合金属氧化物材料浸出在溶解有一种金属氧化物的成分的浸出溶液中。 优选地,煅烧温度约为300℃至1300℃。浸出组分可以选自HCl,HNO 3,H 2 SO 4,H 3 PO 3及其组合的酸性溶液或NH 3,NaOH, KOH及其组合。