WO2008036902A2 - Cyclic catalytic upgrading of chemical species using metal oxide materials - Google Patents
Cyclic catalytic upgrading of chemical species using metal oxide materials Download PDFInfo
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- WO2008036902A2 WO2008036902A2 PCT/US2007/079165 US2007079165W WO2008036902A2 WO 2008036902 A2 WO2008036902 A2 WO 2008036902A2 US 2007079165 W US2007079165 W US 2007079165W WO 2008036902 A2 WO2008036902 A2 WO 2008036902A2
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Definitions
- This invention relates generally to the field of catalysis. More specifically, the invention relates to methods of using metal oxide materials for catalytic upgrading of chemical species. Description of Related Art
- the process utilizes a reactor packed with nickel oxide, copper oxide, cobalt oxide, silver oxide, tungsten oxide, manganese oxide, or molybdenum oxide which is exposed to a reducing gas, converting the metal oxides to the corresponding metals. The metals are converted back to the metal oxides upon exposure to an oxidizing gas. Additionally, strontium sulfate or barium sulfate can be employed, which, when contacted with reducing gas, are converted to the corresponding sulfides. In this manner, heat can be transferred to the endothermic process (reduction of oxidizing gas).
- perovskite metal oxides in the cyclic autothermal recovery (CAR) process utilizes the metal oxides as oxygen storage materials to provide oxygen to a number of processes.
- a process which comprises: alternately contacting an oxygen-carrying catalyst with a reducing substance, or a lower partial pressure of an oxidizing gas, and then with the oxidizing gas or a higher partial pressure of the oxidizing gas, whereby the catalyst is alternately reduced and then regenerated to an oxygenated state.
- the reducing substance when contacted with the oxygen-carrying catalyst, is converted to at least one chemical product.
- the reducing substance is one or more gas, liquid, or solid substance, or a mixture of any of those.
- contacting the catalyst includes alternately exposing a fixed bed containing the catalyst to the reducing substance and to the oxidizing gas, or exposing the fixed bed containing the catalyst to a continuous feed of the oxidizing gas and intermittently feeding the reducing substance.
- contacting the catalyst includes circulating the catalyst in a fluidized bed system during the alternate contacting of the oxygen-carrying catalyst with a reducing substance, or a lower partial pressure of an oxidizing gas, and then with the oxidizing gas or a higher partial pressure of the oxidizing gas. In some embodiments, contacting the catalyst includes circulating the catalyst in a fluidized bed system wherein the catalyst is reduced in a reactor and is circulated to a regeneration unit for contacting with the oxidizing gas or higher partial pressure of the oxidizing gas.
- the reducing substance comprises a gaseous hydrocarbon
- the chemical product is synthesis gas
- the catalyst is active for catalyzing the partial oxidation of the hydrocarbon
- the catalyst comprises Ce 0 gsNio 05O
- the reducing substance comprises a liquid hydrocarbon fuel
- the product comprises synthesis gas
- the catalyst is active for catalyzing the partial oxidation of the liquid hydrocarbon fuel
- the catalyst comprises Sr v La w B x B' y B" z O ⁇
- B Co or Fe
- B' Al or Ga
- B" Cu, 0.01 ⁇ v ⁇ 1.4, 0.1 ⁇ w ⁇ 1.6, 0.1 ⁇ x ⁇ 1.9, 0.1 ⁇ y ⁇ 0.9, 0 ⁇ z ⁇ 2.2, and 3 ⁇ ⁇ ⁇ 5.5.
- the oxygen-carrying catalyst comprises Sr 1 4 LaOoCo 1 OAIo 4 Os, Or SrOSiLa 1 43 Co 1 33 AIo 24 O 4 Si, Or SrO 3 La 1 2 TCO 1 74 AIo 2 IOs I 3 , or Sr 0 o 2 Lao ⁇ Fe 1 0 3 Al 0 O 2 Cu 2 O s0 49 7.
- the reducing substance comprises liquid hydrocarbon fuel and lower partial pressure oxidizing gas in combination
- the product comprises synthesis gas
- the catalyst is active for catalyzing the partial oxidation of the liquid hydrocarbon fuel
- the process includes (a) co-feeding both the fuel and a lower partial pressure of an oxidizing gas to the catalyst in a reforming reactor, to reduce the catalyst, and produce synthesis gas, and (b) then exposing the reduced catalyst to the higher partial pressure of the oxidizing gas in the absence of the fuel to regenerate the catalyst.
- the process also includes separating H 2 from the synthesis gas.
- the catalyst is contacted by the fuel and oxidizing gas at a temperature less than or equal to 900 0 C.
- the catalyst comprises (a) Sr 1 4 La O oCo 1 6 AIo 4 Os, or (b) Sr 03 ILa 1 43 Co 1 33 Al 024 O 48 I, or (c) Sr 03 La 1 27 Co 1 74 Al 021 O 5 I 3 , or (d) Sr 0 O 2 La 0 ⁇ Fe 1 63 Alo O 2 Cu 2 os0 49 7.
- the reducing substance comprises a liquid fuel selected from the group consisting of diesel, gasoline, jet fuel, alcohols, glycerol, and plant oils.
- the reducing substance comprises coal particles
- the product comprises synthesis gas
- the catalyst is active for catalyzing the gasification of the coal particles
- the catalyst comprises at least one metal oxide-containing material selected from the group consisting of Fe 2 O 3 , Fe 3 O 4 , MnO x , CoO x , NiO x , FeTiO 3 , CaCO 3 , CaO, and Mn ⁇ x Cu x O y or Mn ⁇ x Fe x O y wherein 0.01 ⁇ x ⁇ 0.99 and 1 ⁇ y ⁇ 1.5, and coal ash either as a catalyst material itself or as a support for the metal oxide-containing material.
- the reducing substance comprises biomass particles
- the product comprises synthesis gas
- the catalyst is active for catalyzing the gasification of the biomass particles
- the catalyst comprises at least one metal oxide-containing material selected from the group consisting of Fe 2 O 3 , Fe 3 O 4 , MnO x , CoO x , NiO x , FeTiO 3 , CaCO 3 , CaO, and Mni_ x Cu x 0 y or wherein 0.01 ⁇ x ⁇ 0.99 and 1 ⁇ y ⁇ 1.5, and coal ash either as a catalyst material itself or as a support for the metal oxide-containing material.
- the reducing substance comprises a hydrocarbon
- the product comprises a dehydrogenated hydrocarbon
- the catalyst is active for oxidatively dehydrogenating the hydrocarbon
- the reducing substance comprises a hydrocarbon
- the product comprises an oxidatively functionalized hydrocarbon
- the catalyst is active for catalyzing the selective oxidation of the hydrocarbon by which at least one oxygenous function is inserted into the hydrocarbon
- adsorbing comprises exposing the catalyst to pressurized air, and the desorbing comprises exposing the catalyst to a vacuum when the catalyst contains adsorbed oxygen.
- the catalyst comprises Sr 1 4LaOoCo 1 6 AIo 4O 5 , or SrO 3 La 1 27 Co 1 74 AIo 21 O 5 13 , or SrO 3 ILa 1 43 Co 1 33 Al 024 O 48 I, or Sr 0 O 2 La 026 Fe 1 63 Al 0 O 2 Cu 2 QsO 497 , or Ce 05 Fe 0 1 Cu 04 O 2 , or CeCo 05 Cu 05 O 3 , or Ce 0 12 Mn 034 Co 054 O 1 64 , or CeO 45 ZrOo 5 Mn 045 CuOo 5 O 1 7
- the catalyst is supported on a sintered metal fiber filter.
- the reducing substance in an above-described process comprises a combustible waste material, the product is char and volatiles, and the catalyst comprises a metal oxide that is active for pyrolyzing the waste material.
- Also provided in accordance with certain embodiments is a process for the cyclic catalytic partial oxidation of a carbon-containing feedstock which comprises (a) in an oxidation stage, passing air over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from the air, to produce an oxidized catalyst and producing an effluent comprising oxygen-reduced air; (b) passing the feedstock over the oxidized catalyst in a reduction stage to create a product gas comprising carbon monoxide and hydrogen, wherein the oxidized catalyst becomes reduced or partially reduced creating a metal or metal oxide; and (c) repeating (a) to reoxidize the catalyst.
- Certain other embodiments of the present invention provide a process for the direct generation of hydrogen peroxide which comprises: (a) in an oxidation stage, passing air over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from the air, to produce an oxidized catalyst and producing an effluent comprising oxygen- depleted air; (b) passing hydrogen over the oxidized catalyst in a reduction stage to create a product gas comprising hydrogen peroxide, wherein the oxidized catalyst becomes reduced or partially reduced; and (c) repeating (a) to reoxidize the catalyst, wherein the catalyst comprises a nano structured catalyst comprising a carbon- or nitrogen-containing metal complex deposited in the pores of a mesoporous support material, wherein the metal is selected from the group consisting of Pt, Pd, Au, Ag, Co, Ni, Cu or Ru.
- a process for cyclic reduction of carbon dioxide comprises: (a) in an oxidation stage, passing carbon dioxide over a catalyst comprising a metal or metal oxide that is capable of capturing oxygen from the carbon dioxide, to produce an oxidized catalyst and producing an effluent comprising carbon monoxide; (b) in a reduction stage, passing hydrogen over the oxidized catalyst to produce water, whereby the oxidized catalyst becomes reduced or partially reduced; and (c) repeating (a) to reoxidize the catalyst, wherein the catalyst comprises iron.
- water and carbon monoxide products are recovered.
- Figure IA is a schematic diagram of a process in which an oxygen-carrying material is alternately reduced and then oxidized, in accordance with certain embodiments of the invention.
- Figure IB is a schematic diagram of a process in which an oxygen-carrying material alternately adsorbs and desorbs oxygen when subjected to cyclic applications of pressurized air, with heating-cooling, and then subjected to vacuum and increased temperature to release O 2 , in accordance with certain embodiments of the invention.
- Figure 1C is a schematic diagram of a process in which an oxygen-carrying material is alternately reduced and then oxidized by exposure to an oxidizing gas at higher partial pressure followed by exposure of the material to the oxidizing gas at a lower partial pressure together with a hydrocarbon feed, in accordance with an embodiment of the invention.
- Figure 2 illustrates methane conversion of selected catalysts over time after initial product formation, in accordance with certain embodiments of the invention.
- Figure 3 illustrates selectivity towards POM over time after initial product formation of selected catalysts, in accordance with certain embodiments of the invention.
- Figure 4 illustrates plots of product levels generated versus time in the chemical looping gasification of Wyodak coal over 6.9 g (10 ml) 100-170 mesh catalyst, in accordance with certain embodiments of the invention.
- Figure 5 illustrates lower heating values for undiluted product gases obtained from gasification experiments using certain catalyst embodiments of the invention.
- Figure 6 illustrates a plot of electrochemical sensor response versus adsorbent temperature using certain catalyst embodiments of the invention.
- Figure 7 illustrates a schematic flow diagram of a fluidized bed system for chemical looping using certain catalysts, in accordance with embodiments of the invention.
- Figure 8 illustrates a schematic of a fixed bed reactor unit used for a partial oxidation chemical looping process, in accordance with certain embodiments of the invention.
- Figure 9 illustrates a schematic of a fixed bed chemical looping system employing multiple fixed bed reactors in sequence, which is used in accordance with certain embodiments of the invention.
- Figure 10 is a schematic illustration of the preparation procedure for metal oxide coated sintered metal fiber based partial oxidation catalysts for use in accordance with certain embodiments of the invention.
- Figure 11 is a schematic illustration of a fluidized bed based chemical looping process for cyclic reduction of CO 2 and subsequent reduction of iron oxide to metallic iron, in accordance with certain embodiments of the invention.
- Figure 12 illustrates a fixed bed cyclic (chemical looping) system utilizing a metal oxide oxygen carrying material supported on sintered metal fiber filters (SMFFs) for the separation of oxygen from air, in accordance with certain embodiments of the invention.
- SMFFs sintered metal fiber filters
- Figure 13 illustrates a schematic diagram of overall cyclic partial oxidation reformer (CycloFormerTM) system, in accordance with certain embodiments of the invention.
- Figure 14 illustrates a conception of a CycloFormerTM in accordance with an embodiment of the invention
- Figure 15 is a schematic illustration of a process concept which employs an oxygen carrier for oxygen separation and coal gasification, in accordance with certain embodiments of the invention.
- FIG 16 is a schematic illustration of an oxidative dehydrogenation process employing an oxygen carrying catalyst for oxygen separation and fluidization, in accordance with certain embodiments of the invention.
- Figure 17 is a plot of product evolution versus time between the appearance of products and sampling time for 99% Glycerol over a Sr 1 4 La O O Co 1 O AIo 4 Os S catalyst at 700 0 C, in accordance with certain embodiments of the invention.
- Figure 18 is a plot of the effect of water and KOH addition (to simulate crude glycerol) on hydrogen production at 800 0 C by an oxygen-carrying catalyst, in accordance with certain embodiments of the invention.
- Figure 19 is a plot demonstrating the stability of the Sr 1 4 La O O Co 1 O AIo 4 Os S coated YSZ granules for reforming glycerol/water/KOH mixture (simulated crude glycerol) in a process according to an embodiment of the invention.
- the catalyst material in the reduced state is then exposed to an oxidizing gas (e.g., air), causing the catalyst to be regenerated into its oxidized state and removing carbonaceous or other material that may have accumulated during exposure to the reducing substance.
- an oxidizing gas e.g., air
- OSC oxygen storage capacity
- Partial oxidation of liquid fuels Organic liquids, including jet fuel, diesel, alcohols, and plant-seed oils can be processed to provide synthesis gas (CO + H 2 ) for various applications including combustion and fuel cells.
- synthesis gas CO + H 2
- the catalyst is incorporated into pellets or onto a monolith and a mixture of air and atomized or vaporized fuel introduced over the catalyst.
- the cyclic (chemical looping or pulsed feed) mode fine droplets or vapor of the fuel and air is introduced over the catalyst bed along with a carrier gas. The feed to the bed is switched between this mixture and air (or other oxidant), as illustrated in Figure IA.
- air can be fed continuously to the bed and the liquid feed delivered to the reactor (as droplets or vapor) intermittently (as pulsed feed), as illustrated in Figure 1C.
- the liquid feed may be continuously or semi-continuously fed into a reactor containing the catalyst, which continuously circulates between this reactor and a regenerator in which the oxygen carrier is re-oxidized and carbonaceous films and impurities are burned off.
- FCC fluid catalytic cracking
- Figure IA Partial oxidation of gaseous fuels
- the feed to the reactor is switched between air and a gaseous fuel (natural gas, methane, or other hydrocarbons.
- the fuel may be fed to a reactor in which catalyst is continuously circulated between a fuel partial oxidation reactor and a regenerator.
- Coal, biomass, industrial waste (petroleum reside, plastics, tire rubber, etc.) is continuously or semi-continuously fed to a reactor containing a fluidized or moving bed of the oxygen carrying catalyst (Figure IA).
- the catalyst circulates between the coal gasification bed and a regeneration bed where the catalyst is exposed to air and reoxidized.
- Adsorbed impurities liberated from coal can also be released and removed from the regenerator exhaust by scrubbing or other capture processes.
- Oxygen separation from air is possible to air.
- a reduced carrier is exposed alternately to air at some temperature and pressure and then to vacuum, lower pressure, a higher temperature, or a combination or lower pressure and higher temperature which causes adsorption equilibrium to shift towards the gas phase.
- a hydrocarbon e.g., alkane or olefin
- the process may be carried out in either circulating fluidized bed or fixed bed, in pulsed co-feed modes.
- This consists of the functionalization of hydrocarbons by the catalytic insertion of oxygenous functions on carbon atoms or in the oxidation of other groups, e.g., of alcohols to aldehydes. Circulating fluid beds and fixed beds utilizing pulsed co-feed are applicable reactor types, similar to Figures IA and 1C. (7) Cyclic catalytic oxidation/reduction process for gasification of waste, e.g., waste feed, char, volatiles.
- Oxygen carrying catalysts utilized in the processes described herein are preferably prepared by co-precipitation, urea precipitation, or sol-gel synthesis, using known techniques.
- the metal oxide catalysts may take the form of granules, pellets, or monolithic structures.
- Coal ash may also be used as a support for selected unary (Fe 2 O 3 , Fe 3 O 4 , MnO x , CoO x , and NiO x ) and binary (FeTiO 3 , Mn ⁇ x Cu x O y , and Mn ⁇ x Fe x O y ) metal oxides.
- the metal oxide materials and coal ash may be bound with an inorganic binder such as silica, titania, magnesia, boehmite, or zirconia.
- fixed beds of these catalysts may be either exposed to alternating air and feed or to a continuous feed of air and intermittent (pulsed) feed of feedstock.
- fluidized bed systems comprise one, two, or even more fluidized beds, as desired for a particular application. Alternating exposure to air and feed is achieved either by means of a set of valves (for a single bed) or in the case of two or more beds by circulation of the oxygen carrier between the reactor and regenerator beds.
- Embodiments of the compositions and methods disclosed herein (1) make possible the production of unique products (2) offer new modes of operation, and (3) employ new oxygen carrying materials. Certain embodiments employ selected oxygen-carrying materials for the selective conversion of hydrocarbons and other fuels to synthesis gas and other more valuable species. Some of the specific materials identified for liquid fuels reforming have not been previously employed.
- coal gasification by an indicated method utilizes direct contact of coal with an air oxidized metal oxide material, producing synthesis gas;
- natural gas chemical looping partial oxidation uses a fixed bed of oxygen-carrying catalyst which is alternately exposed to air and natural gas;
- chemical looping liquid fuels reforming utilizes a fixed catalyst bed with continuous air feed and intermittent, pulsed delivery of liquid fuel. Representative examples are provided below to further elucidate the preferred embodiments.
- the catalysts used in these examples were prepared by coprecipitation. A fixed bed of fine catalyst granules (0.5g) was employed. The catalyst was heated to 75O 0 C and was exposed to air to oxidize the catalyst. The reactor was then purged with helium and pure methane introduced. Space velocity was 6000ml/g»min. Measurement of H 2 , CO, CO 2 , and CH 4 was performed by injection of product stream samples into a gas chromatograph. Samples were taken at some time after the initial observation of products. The catalyst was then reoxidized before another product stream sample was taken at a different time interval after appearance of products.
- a bed of granular catalyst material of mesh size 40 - 100 mesh heated to between 65O 0 C and 85O 0 C was fluidized using atmospheric pressure air, being exposed to air for 5 - 20 minutes. Fluidization with air was interrupted and steam introduced into the gasifier. Wyodak coal of mesh size 20 - 40 was then introduced at a rate of 0.33g/min for 1.75 - 2.75 minutes. The coal feed was interrupted and allowed to contact the fluidized catalyst for 10 - 20 minutes. Products were sampled with a gas tight syringe and analyzed using gas chromatography.
- a bed of grains of catalyst material was oxidized in air at a temperature between 600 0 C and 75O 0 C for 5 - 20 minutes. Liquid fuel was then introduced into the reactor at a flow rate of 0.05ml/min. The gas flow emerging from the reactor was measured using a bubble flow meter. Gaseous products (CO, CO 2 , H 2 , and CH 4 ) were analyzed using gas chromatography. Experimental conditions employed and data obtained over preferred catalyst materials Sr 031 La 1 43 Co 1 33 AIo 24 O 4 Si (1) and Sro 3 Lai 27 C ⁇ i 7 4 Al 02 i ⁇ 5 13 (2) is presented in Tables 1 and 2.
- the temperature was then decreased from 700 0 C to 100 0 C at 1O 0 C /min under air and was held at 100 0 C for 30 minutes before changing the purge gas to helium.
- the reactor was then purged for 30 minutes at a temperature of 100 0 C.
- the adsorbent bed temperature was then increased at 1O 0 C /min under helium and the effluent from the reactor monitored with an electrochemical oxygen sensor. The sensor output was recorded, giving rise to graphs of the type shown in Figure 6. Data obtained over key materials is presented in Table 3.
- a fluidized bed cyclic redox (chemical looping) system utilizing a metal oxide oxygen carrier for partial oxidation of methane for the production of syngas/hydrogen is shown in Figure 7.
- the reformer consists of a high velocity air fluidized riser connected, through loop seals, to a low velocity methane fluidized riser. Carbon deposition and steam requirements and, possibly, the need for a prereformer are reduced or eliminated by this cyclic mode. This cyclic operation also eliminates the need for an expensive air separation unit or for H 2 /N 2 separation.
- Compositions possessing the general formula where B Zr, Ba,
- Unsupported metal oxide catalysts are prepared by: (i) co-precipitation, (ii) urea precipitation, and (iii) sol gel synthesis, using known techniques. Initially, a number of the compositional parameters x, y, and z are utilized, but following coarse screening, these stoichiometric subscripts are varied based on the experimental results according to mixture and/or Simplex designs.
- Supported metal oxide catalysts are prepared through wetness impregnation utilizing compositions of preferred unsupported catalysts on various supports. Synthesis includes suspending 10 grams of support (Al 2 O 3 , MgO, CeO 2 , or MgAl 2 O 4 ) in an aqueous solution of the desired metals (Ce) nitrate and (Ni) nitrate without any supernatant liquid. The slurry is dried by evaporation and then heated in an oven at 12O 0 C for 8 hours. Following drying, the solid is calcined at 600 0 C for 12-24 hours in order to decompose the nitrate and provide a supported metal oxide product.
- a metal oxide oxygen carrying catalyst supported on a sintered metal fiber filter (SMFF) is utilized in a fixed bed cyclic redox (chemical looping) system for partial oxidation of methane for the production of syngas/hydrogen.
- the reformer consists of one or more heated beds of SMFF supported, sulfur tolerant partial oxidation catalyst and operates by alternate exposure to air and gas. Carbon deposition and steam requirements and, possibly, the need for a prereformer are reduced or eliminated by this cyclic mode. This cyclic operation also eliminates the need for an expensive air separation unit or for H 2 /N 2 separation.
- Unsupported metal oxide catalysts were prepared by either: (i) co-precipitation, (ii) urea precipitation, and (iii) sol gel synthesis. Initially, a number of the compositional parameters x, y, and z are utilized, but following coarse screening, these stoichiometric subscripts are varied based on the experimental results according to mixture and/or Simplex designs discussed below.
- Sintered metal fiber filters FECRALLO YTM supplied by Bekaert Fiber Technology, Belgium
- CeO 2 CeO 2 and/or a variety of cerium based mixed metal oxides.
- coated fibers are then impregnated with mixed metal oxide materials having the general formula Ce 1-x-y Ni y (A) z O 2- ⁇ (where A is a basic metal dopant such as La, Ba, Ca, or Sr). See Figure 10, (sol-gel synthesis of metal oxide coated sintered metal fibers (A to B) is followed by impregnation of coated surface with mixed metal oxide catalysts (B to C)).
- Preparation of the cerium oxide SMFF coatings is achieved through the sol-gel solvent evaporation method. This consists of adding the appropriate metal salts or alkoxides (Le,. acetylacetonates, isopropoxides) to a chosen solvent (various alcohols). A stabilizer, such as acetylacetonate, is added in an attempt to keep the sol solution clear and particle free to prevent large particles from clogging the filter during dip-coating and spraying. The stabilizer addition is followed by addition of a calculated amount of water and acid (HCl, HNO 3 ) or base for hydrolysis and condensation to form precipitate free, homogeneous, non- water sensitive, stable sols.
- HCl, HNO 3 water and acid
- the gels are aged for a chosen time and sprayed onto the sintered metal fiber filter or the filter is immersed in the gel and removed. Regardless of application method the filter is then left to dry for 12-24 hours and then calcined in air at 400 0 C -700 0 C.
- Impregnation of the coated SMFFs is done through wet impregnation or incipient wetness impregnation.
- wet impregnation the chosen metal salt(s) is(are) combined in previously determined ratios and dissolved in methanol or water.
- Coated sintered metal fibers are then immersed in the solution for a chosen time frame, extracted, allowed to either age in air and then dried in a 100 0 C oven overnight or dried immediately. Dried fiber filters are then calcined in air for 4-8 hours at 700 0 C -1000 0 C.
- Impregnated metal fiber filters are either allowed to age for a given time and then dried in a 100 0 C oven overnight or dried immediately. Dried fiber filters will then be calcined in air for 4-8 hours at 700 0 C -1000 0 C.
- Example 7 Reduction of CO 2
- a fluidized bed cyclic redox (chemical looping) system utilizing an iron oxide carrier for cyclic reduction of carbon dioxide to carbon monoxide (equations 1,2) and the subsequent reduction of iron oxide to metallic iron (equations 3,4) is described.
- Iron oxides may be synthesized by two different types of precipitation reactions.
- the first consists of adding a solution of precipitating agent (NaOH, KOH, Na 2 CO 3 , K 2 CO 3 ,
- urea gelation/precipitation consists of adding a large excess of urea to an aqueous solution of the metal ions. By boiling the resulting solution at 100 0 C for eight hours, adding water as necessary, a slow decomposition of the urea ensues, creating a basic solution over time which in turn results in the slow precipitation of the desired products.
- the precipitate of either method are then collected through vacuum filtration, dried in an oven at 100 0 C for 24 hours, ground into a fine powder using an alumina mortar and pestle, and then calcined, in air or in a reducing environment depending on the desired product, at temperatures between 600 0 C and 900 0 C for 4-12 hours.
- This process is applicable for reducing CO 2 concentrations in gases, and utilizing the water and carbon monoxide products. For example, they may be used in fuels, as feedstocks for making commodity chemicals, and/or used for life support purposes.
- One particular application is for reducing the CO 2 atmosphere on Mars, which is primarily composed of CO 2 .
- SMFFs sintered metal fiber filters
- Embodiments of this technology produce inexpensive, high purity oxygen streams for use in processes such as coal gasification, integrated gasification combined cycle (IGCC), and oxycombustion leading to an exhaust stream void of NO x and much more concentrated in CO 2 , making it easier to capture than with current technologies.
- processes such as coal gasification, integrated gasification combined cycle (IGCC), and oxycombustion leading to an exhaust stream void of NO x and much more concentrated in CO 2 , making it easier to capture than with current technologies.
- IGCC integrated gasification combined cycle
- Basecoats applied to SMFFs were shown to be stable and crack free to 700 0 C.
- the general oxygen separation process involves the pressurization (between 25 and
- a fixed bed cyclic redox (chemical looping) system utilizing a metal oxide oxygen carrier for partial oxidation of liquid fuel (jet fuel, diesel, kerosene, gasoline, etc) is described and illustrated schematically in Figure IA.
- the reformer consists of a small heated bed of sulfur tolerant partial oxidation catalyst and operates by alternate exposure to air and vaporized fuel. Carbon deposition and steam requirements and, possibly, the need for a prereformer are reduced or eliminated by this cyclic mode. This cyclic operation also eliminates the need for an expensive air separation unit or for H 2 /N 2 separation.
- the system is based on: 1) the partial oxidation of hydrocarbons by an oxygen carrier which can alternately adsorb oxygen and catalyze partial oxidation of fuel and 2) a post-processing module for hydrogen separation based on a hydrogen transport membrane.
- molybdenum to cobalt enhances sulfur tolerance, desulfurization activity, and will impart some cracking activity to cobalt.
- the supported base metal catalysts are prepared by incipient wetness.
- a typical synthesis includes suspending 10 grams of support (Al 2 O 3 , MgO, CeO 2 , or MgAl 2 O 4 ) in an aqueous solution of the desired metal (Co) nitrate (and ammonium molybdate) without any supernatant liquid.
- the slurry is dried by evaporation and then heated in an oven at 12O 0 C for 8 hours.
- the solid is calcined at 600 0 C for 12-24 hours in order to decompose the nitrate and provide a supported metal oxide product. If desired, the oxide may then be reduced to elemental metal by flowing H 2 over the catalyst at 600 0 C for 8 hours.
- Example 10 Cyclic Catalytic Reforming of Hydrocarbon Fuels - Co-fed System
- a process for the cyclic catalytic reforming of a hydrocarbon fuel utilizes a compact reformer system based on a cyclic (chemical looping) partial oxidation for generating syngas from liquid hydrocarbon logistic fuels (e.g., JP-8, JP-5, Jet-A, diesel, etc.).
- a reformer incorporating a small heated bed of sulfur tolerant partial oxidation catalyst alternately exposed to air and vaporized fuel is employed. This cyclic mode will potentially reduce the amount of carbon deposited and the amount of steam required.
- Figure 13 schematically illustrates the process flow of the reforming operation in a co-fed air/pulsed fuel system using certain oxygen carrying catalysts.
- Carbon (coke) formation is dealt with by alternating exposure to fuel rich and fuel lean conditions; (4) Thermal management obtained by splitting reaction into temporally and/or spatially separated carrier and fuel oxidation (carrier reduction) reactions; (5) Multiple beds enable continuous delivery of reformate; and (6) Fuel sulfur can be removed by hydrodesulfurization of organo sulfides in the hydrogen rich product stream if the catalyst bed is made sufficiently long. The catalyst and similarly hot internal surfaces are successively and periodically exposed to fuel and then to air. The resulting deposits can be readily removed by exposure to air.
- catalyst oxygen carriers
- molybdenum may be added to the catalyst to enhance sulfur tolerance, desulfurization activity, and impart additional cracking activity to cobalt and/or iron.
- Example 11 Cyclic Catalytic Reformer for Hydrocarbon Fuels - Sequential Feeds
- This variation of a reforming process comprises the partial oxidation of hydrocarbons by an oxygen carrier/catalyst which can alternately adsorb oxygen and catalyze partial oxidation of fuel.
- the catalyst and similarly hot internal surfaces are successively and periodically exposed to fuel and then to air, in a manner like that illustrated in Figure IA.
- the resulting deposits on the catalyst can be readily removed by exposure to air.
- inert inorganic (e.g., ceramic or glass) surfaces coating internal surfaces with the oxygen carrier (catalyst) can impart carbon oxidation activity, which can, potentially eliminate the problem of carbon deposition over time.
- the processes responsible for carbon deposition also liberate hydrogen which can be separated down-stream. Even with the occurrence of carbonization, loss of efficiency is not inevitable in the cyclic PO x process.
- Some suitable catalysts are selected from the generic composition
- Catalysts are pelletized using binders such as aluminum oxide (and boehmite), titania, colloidal silica, and magnesium oxide. Selected doped ceria materials also displayed good activity.
- the selected oxygen-carrying materials described herein have enhanced attrition resistance.
- a mechanically strong catalyst possessing activity for conversion of coal to synthesis gas is obtained.
- the resulting powder was then sieved to less than 45 mesh and pressed in a 2 1/4 inch die to 20,000 pounds (5,030 psi) for four minutes.
- the large pellet was sintered at 1025 0 C for four hours, l°C/minute ramp rate. Once tablets were formed as such, they were shattered, ground, and sieved to the desired mesh size (generally 20-40).
- M Fe, Mn, or Ni and 0.7 ⁇ x ⁇ 0.99.
- a ceramic carrier form e.g. , fly ash or iron oxide beads
- This may be achieved by addition of the pellets to a solution of the desired metal ions or metal complex species in the required concentrations. Excess solvent may be removed by evaporation and the dry beads calcined at 200 0 C -1000 0 C, depending on the catalyst deposited.
- Pellets may be fabricated by tumbling powder as catalyst is sprayed onto the pellets or by spray drying. Forms other than spheres may be fabricated.
- cylindrically symmetric forms such as bars, tubes, spaghetti, and miniliths
- extrusion or (in the case of ring or tubular forms) isostatic pressing This involves the preparation of a paste or dough of the relevant powder with organic binders, dispersing agents, waxes, and other combustible additives (for porosity enhancement described above).
- An extruder incorporating a die of the appropriate cross section is used for the extrusion operation.
- the extruded green bodies are sintered at temperatures of 1000-1700 0 C, depending on the material being sintered.
- the extruded form may comprise catalyst or of carrier material: the procedure to be employed may be the same in the two cases. Application of the catalyst to support carriers may be performed as described above for support beads.
- a dual fluidized bed configuration (similar to fluidized catalytic cracking) or a switched feed single fluidized bed system may be employed.
- a switched feed moving bed and entrained flow configurations are possible.
- Selection of the reactor type is typically based on engineering analysis of the potential performance of each type as well as consideration of their advantages and disadvantages.
- One variation of the switched-feed single bed system is an air fed- vibrating bed system. This allows for the reduction or elimination of a diluent gas feed on gasification.
- the vibration may be applied during both carrier oxidation and gasification. Frequency, amplitude, and source of vibration are important variables whose influence must be determined by experimentation.
- the vibrational source may be either vibrating baffles, an air activated piston, or an ultrasonic horn, or any other type of suitable vibration source. This vibrationally fluidized system, as with any fluidized bed design, will require design of fluidized bed internals.
- the coal gasification process may be modified, if desired, by feeding other substances, such as biomass, waste, scrap tires, or other opportunity fuels could be fed separately or concurrently with coal for gasification. Because a low operating temperature ( ⁇ 900 0 C) is employed, the gasifier preferably operates in an ashing, rather than slagging mode. In still other variations of the coal gasification process, inorganic waste streams (e.g., ash) are processed for use as the oxygen carrier.
- inorganic waste streams e.g., ash
- coal gasification process includes 1) conversion of biomass to synthesis gas; 2) chemical looping partial oxidation of hydrocarbons; 3) chemical looping combustion of solid fuels including coal, biomass, heavy reside, etc.; 4) chemical looping combustion of hydrocarbons; and 5) chemical looping hydrogen production.
- Catalysts for promoting the selective and spontaneous oxidative dehydrogenation or coupling of hydrocarbons is based on the application of super-base, amphoteric (i.e., containing both acid or electrophilic, and base sites) catalysts.
- Catalysis is based on a mixture of both oxygen storage and oxidative dehydrogenation catalyst components in contact with one another. The synergistic role of the catalyst components and their functions is only fully exploited when optimum process operating conditions are also employed.
- Molecular oxygen is not present as with a co-feed configuration.
- the catalysis strategy for promoting the oxidative dehydrogenation reaction relies on either basic or amphoteric sites for activating C-H bonds. Additionally, an oxygen storage function must be present to allow for chemical looping.
- the first category the super-bases of general formula ABi. x B' x O y , are represented most effectively by BaZr ⁇ x Y x O 25 - S and are the currently preferred catalyst materials.
- the transition metal oxide serves as an oxygen storage component.
- Manganese oxide is included in some embodiments in order to provide oxygen storage capacity.
- the materials are employed in a cyclic (chemical looping) process based on a circulating fluidized bed process and system ( Figure 16) or a switched (between air and fuel) feed fluidized bed system or switched feed fixed bed system, in which air and fuel feeds are alternated.
- Nano structured catalyst materials prepared by "nanocasting" carbon/nitrogen- containing metal complexes in the pores of mesoporous silicas or by self-assembling such complexes with inorganic (e.g., silica) precursors and their application in a process for the direct generation of hydrogen peroxide is discussed in this example.
- new catalysts are based on the thermal decomposition of specific metal complexes (Pt, Pd, Au, Ag, Co, Ni, Cu, or Ru phthalocyanine or tetraphenylporphine) in the pores of mesoporous silica materials or by the spontaneous self-assembly of metal complex and inorganic framework precursors.
- the anticipated net effect of these metallomacrocycle-based nano structured catalysts will be 1) to provide highly (even atomically) dispersed active catalyst sites, 2) to provide high surface area and pore volume, and 3) to provide specific benefits of other properties of the nano structured materials.
- These multifunctional catalyst materials are used in a chemical looping process for catalyzing the direct reaction of hydrogen and oxygen to form hydrogen peroxide.
- the cyclic process design allows: (1) Separation of oxygen from air, (2) use of undiluted hydrogen with minimal explosion hazard because hydrogen and oxygen are spatially separated when each contacts the catalyst and/or 3) elimination of organic solvent use.
- waste species waste feed, char, volatiles, etc.
- Embodiments of this technology will offer the following potential attributes: 1) feed flexibility brought about by pre-pyrolysis of waste into char and volatiles; 2) lower cost for air separation; 3) a gasifier that is optimal for conversion of waste feed with minimal heat loss and slag or ash processing without accumulation of tar in cooler downstream parts of the system; 4) the excellent heat transfer characteristics of fluidized bed gasifiers; 5) reduced tar accumulation owing to presence of oxidized oxygen carrier in vulnerable regions of the gasifier; and 6) improved syngas cleanup.
- waste gasification may be conducted using a chemical looping reactor to effect combined air separation, waste gasification, and gross sulfur removal.
- a system comprised of: (1) a preprocessing stage in which waste is compacted and dried. The preprocessing stage consists of a retort for drying and waste heating, along with a condenser for collection of tar and oils. (2) An ASU/gasification reactor based on Eltron's chemical looping technology.
- the preprocessed waste stream is devolatilized (using waste heat from the gasifier and syngas quench cooling) by pyrolysis upon its entrance into the gasifier chamber.
- pyrolysis and gasification can be combined in the chemical looping gasifier reactor.
- a syngas quench cooler 4)
- a warm gas cleanup module This may consist of a third fluidized bed or of a downstream sorption module. Warm gas clean-up would be performed either by the use of sorbents in a third fluidized bed or of downstream adsorbent beds containing materials selected from zinc oxide, zinc oxide supported copper (low temperature water gas shift catalyst), or the regenerable sorbents zinc ferrite or zinc titanate.
- a hydrogen separation module is used to recover waste heat from the gasifier and syngas quench cooling.
- the catalysts may be pelletized using one of the following binders: yttrium stabilized zirconium (YSZ), aluminum oxide, boehmite, gibbsite, and magnesium oxide.
- the catalyst bed was then purged with helium and the atomized glycerol was introduced at a flow rate of 0.27 g/min.
- a sample of the product gas was taken and analyzed using a gas chromatograph at a set time from when the gaseous products began to be produced. Several cycles alternating between air and glycerol were performed with variable glycerol exposure times.
- Representative catalysts have shown excellent resistance to catalyst fouling from the residual KOH in crude glycerol (residual transesterification catalyst). Besides increasing the efficiency of the reforming reaction, the KOH imparts reverse water-gas-shift capacity to the catalyst, which converts the H 2 O stream to H 2 (see Figure 18).
- porous catalyst granules of ytrria- stabilized zirconia (YSZ) were prepared and coated with 6.6 wt% Sr 1 4 La 00 Co 1 6 Al 04 ⁇ 53 . 20 g of coated granules were packed into a fixed bed reactor and heated to 800 0 C. Catalyst oxidation comprises one leg of the chemical looping cycle.
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EP2076325A2 (en) | 2009-07-08 |
US8435920B2 (en) | 2013-05-07 |
CN101534927A (en) | 2009-09-16 |
CN101534927B (en) | 2014-02-19 |
US20080164443A1 (en) | 2008-07-10 |
AU2007299691A1 (en) | 2008-03-27 |
WO2008036902A3 (en) | 2008-10-02 |
US7824574B2 (en) | 2010-11-02 |
CA2663977A1 (en) | 2008-03-27 |
US20110024687A1 (en) | 2011-02-03 |
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