US20070161714A1 - Fischer-tropsch catalysts - Google Patents

Fischer-tropsch catalysts Download PDF

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Publication number
US20070161714A1
US20070161714A1 US10/587,825 US58782507A US2007161714A1 US 20070161714 A1 US20070161714 A1 US 20070161714A1 US 58782507 A US58782507 A US 58782507A US 2007161714 A1 US2007161714 A1 US 2007161714A1
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Prior art keywords
catalyst
support material
alumina
cobalt
alumina support
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US10/587,825
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Erling Rytter
Torild Skagseth
Hanne Wigum
Nonyameko Sincadu
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PETROSA
Equinor ASA
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PETROSA
Statoil ASA
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Assigned to STATOIL ASA, PETROSA reassignment STATOIL ASA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SINCADU, NONYAMEKO, RYTTER, ERLING, SKAGSETH, TORILD HULSUND
Publication of US20070161714A1 publication Critical patent/US20070161714A1/en
Priority to US12/582,541 priority Critical patent/US8952076B2/en
Abandoned legal-status Critical Current

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Definitions

  • the present invention relates to supported catalysts and their use in Fischer-Tropsch synthesis reactions, and more specifically to processes for the production of the catalyst and support, and to the catalyst and support themselves.
  • Conversion of natural gas to liquid hydrocarbons (“Gas To Liquids” or “GTL” process) is based on a 3 step procedure consisting of: 1) synthesis gas production; 2) synthesis gas conversion by FT synthesis; and 3) upgrading of FT products (wax and naphtha/distillates) to final products.
  • the Fischer-Tropsch reaction for conversion of synthesis gas, a mixture of CO and hydrogen, possibly also containing essentially inert components like CO 2 , nitrogen and methane, is commercially operated over catalysts containing the active metals Fe or Co.
  • Iron catalysts are best suited for synthesis gas with low H2/CO ratios ( ⁇ 1.2), e.g. from coal or other heavy hydrocarbon feedstock, where this ratio is considerably lower than the consumption ratio of the FT-reaction (2.0-2.1).
  • the present invention is concerned with Co-based catalysts, in particular, supported Co-based catalysts.
  • a variety of products can be made by the FT-reaction, but from supported cobalt, the primary product is long-chain hydrocarbons that can be further upgraded to products like diesel fuel and petrochemical naphtha.
  • Byproducts can include olefins and oxygenates.
  • the present invention is concerned with alumina, as a support material.
  • cobalt catalysts are the preferred catalysts for the FT synthesis.
  • the most important properties of a cobalt FT catalyst are the activity, the selectivity usually to C 5+ and heavier products and the resistance towards deactivation.
  • Known catalysts are typically based on titania, silica or alumina supports and various metals and metal oxides have been shown to be useful as promoters.
  • a Thieles modulus is defined as a product of two components, ⁇ n and ⁇ , where ⁇ n depends only on the diffusivity and reactivity of the individual molecules, whereas ⁇ depends only on the physical properties and site density of the catalyst. They have described a model whereby the selectivity to C 5+ products can be described as a volcano plot in terms of ⁇ .
  • ⁇ R o 2 ⁇ m /r p
  • ⁇ m the site density, e.g. as the number of surface atoms of Co metal atoms per cm 2 of pore area in the catalyst particle
  • Ro is the diffusion length, i.e. the radius of an essentially spherical catalyst particle
  • ⁇ is the porosity of the particle (cm 3 pore volume/cm 3 particle volume)
  • r p is the mean pore radius.
  • multiphase reactors of the slurry type generally use small catalyst particles (20-150 mm) which do not give internal diffusion problems, and more specifically that for catalysts based on differently supported cobalt used in the Fischer-Tropsch synthesis, it is possible to neglect internal diffusion limitations by operation with particles having diameter of less than 200 mm.
  • the carrier is dried and calcined at a relatively low temperature of 200 to 450° C., eg. at 300° C., for 2 to 16 hours.
  • a relatively low temperature 200 to 450° C., eg. at 300° C., for 2 to 16 hours.
  • prolonged calcination at higher temperatures eg. above 500° C. can reduce catalyst activity.
  • a method of producing an alumina-supported catalyst which comprises the following steps: a first impregnation step in which an initial alumina support material is impregnated with a source of a 2-valent metal capable of forming a spinel compound with alumina; a first calcination step in which the impregnated alumina support material is calcined at a temperature of at least 550° C.
  • a modified alumina support material to produce a modified alumina support material; a second impregnation step in which the modified alumina support material is impregnated with a source of catalytically active metal; and a second calcination step in which the impregnated modified support material is calcined at a temperature of at least 150° C.
  • a method for the production of an alumina support for a catalyst which comprises impregnating an initial alumina support material with a source of a 2-valent metal capable of forming a spinel compound with alumina, and calcining the impregnated alumina at a temperature of at least 550° C.
  • the invention also extends to catalyst material made in accordance with the first aspect and a support material made in accordance with the second aspect.
  • the invention also extends to the use of the support material and the use of the catalyst in an F-T synthesis.
  • the F-T synthesis may be conducted in a fixed bed reactor or a non-fixed bed reactor, such as a slurry bubble column.
  • the invention also extends to a process for the production of hydrocarbons which comprise subjecting H 2 and CO gases to a Fischer-Tropsch synthesis reaction in a reactor in the presence of a catalyst of the invention.
  • the process can be conducted under typical F-T operating conditions.
  • the products can be subjected to various post-processing operations, such as de-waxing, hydro-isomerisation and/or hydro-cracking.
  • Amorphous catalyst support materials typically have specific surface areas between 50 and 500 m 2 /g, more typically between 100 and 300 m 2 /g.
  • the starting alumina materials used in the present invention are all, at least predominantly, of the ⁇ -alumina type, preferably with specific surface areas between 150 and 200 m 2 /g.
  • These supports can be prepared by spray-drying techniques of an appropriate solution in order to obtain essentially spherical particles of appropriate size, e.g. 80% in the range between 30-120 ⁇ m. After spray-drying, the material is calcined at a high temperature to give the appropriate crystal size and pore structure.
  • the total pore volume is sufficiently high, above 0.2 cm 3 /g or better, above 0.4 cm 3 /g, or even above 0.6 cm 3 /g.
  • the pore volume is often measured by the BET method applying nitrogen as the adsorption gas. This method does not take into account large pores where a mercury porosimeter is more relevant.
  • a less accurate, but more practical parameter is the measured water absorbtivity, which can be directly correlated with the amount of cobalt that can be impregnated on the catalyst by the incipient wetness procedure.
  • a high pore volume will give a light material suitable for operation in a slurry environment and ease the impregnation by minimising the number of impregnation steps required.
  • the support, and the final catalyst should have sufficient strength for extended operation of months and years with minimal attrition of the materials.
  • This can be tested in a slurry environment or by the ASTM method applicable for testing FCC (fluid catalytic cracking) catalysts.
  • ⁇ -alumina catalyst support materials have been investigated, both as received from the alumina vendor (Sasol GmbH of Hamburg, Germany), and following heat treatment. The properties are set out in Table 1. TABLE 1 Properties of alumina as received and heat treated. Alumina Calcination Surface Pore Pore Attrition Water ab- ⁇ - batch temperature area volume(N 2 ) diameter [g/50 g Sorbtivity alumina no.
  • the average particle size is respectively 62 ⁇ m and 59 ⁇ m. **The water absorbtivity is determined as the “incipient wetness” point by successively adding water to the point where water is visually released from the pores of the alumina by gentle tapping of the beaker containing the material.
  • the as received ⁇ -alumina materials from the alumina vendor have been treated in one or both of two ways, namely, further heat treatment/calcinations at temperatures in the range 500-1200° C.; and impregnation by one or a mixture of substances followed by heat treatment in the 700-1300° C. temperature range.
  • the properties of the resulting materials have been investigated.
  • the ⁇ -aluminas or the different alumina hydrates Upon high temperature treatment, the ⁇ -aluminas or the different alumina hydrates will be converted to transition phase aluminas, denoted ⁇ , ⁇ , ⁇ , ⁇ or ⁇ -aluminas, that all finally will be converted to ⁇ -alumina, with a gradual decrease in specific surface areas.
  • These aluminas may also be suitable as support materials for cobalt for the Fischer-Tropsch synthesis, even though this may have specific surface areas in the range 10-50 m 2 /g.
  • the specific surface areas and pore volumes must be balanced towards the requirements for sufficiently high cobalt metal loading and dispersion.
  • it is also possible to increase the high temperature surface stability of aluminas by adding certain stabilising agents like lanthanum (lanthanum oxide). In this way, the ⁇ -phase can be retained, even above 1000° C.
  • Other stabilising agents have been used, such as magnesia and ceria.
  • the particle density is important in order to achieve a suitable distribution (dispersion) of the catalyst particles in the reactor.
  • a light material is particularly advantageous for avoiding catalyst settling or an excessive concentration of particles in the lower part of the reactor.
  • the particle size also affects settling and the catalyst concentration profile, but should not be excessively small, since this makes separation of the liquid product from the reactor slurry more difficult and increases the incidence of particles being transported with the gas phase at the top of the reactor. Attrition should be minimised to prolong the life of the catalyst and to avoid contamination of the liquid hydrocarbon product.
  • an important method for characterisation of the present catalysts and support materials is related to the determination of the pore characteristics; pore volume, pore size distribution, surface area and average pore size.
  • Various techniques may be applied, but most are variations of the so-called BET method using the adsorption or desorption isotherms of a gas that is adsorbed to the surface of the pores, typically nitrogen, but also certain noble gases or mercury are used for specialised purposes.
  • the nitrogen desorption isotherm is used, measured by standard procedures on an ASAP 2000 instrument from Micromeretics and the standard included software for calculation of the pore characteristics.
  • the modified ASTM type equipment for testing attrition consists of two main parts, one air feeding system and one reactor where the attrition takes place. Compressed air passes through a pressure regulator (5 bar) to a moisture chamber where the air is moistened to approximately 30% relative moisture.
  • the amount of air is then adjusted in a mass flow controller.
  • the humid air then enters the reactor through a sieve tray where the holes have a diameter of 0.4 mm. Because of these holes, the gas reaches sonic velocity, which causes the “wear and tear” on the particles in the reactor.
  • the reactor has an internal diameter of 35.6 mm (1.4 inches) and a length of 711 mm (28 inches) and the pressure is approximately 1.8 bar. After passing through the reactor, the velocity is lowered in a separation chamber which has an internal diameter of 112 mm (4.4 inches) and a length of 305 mm (12 inches). There is a conical connection 203 mm long (8 inches) between the reactor and the separation chamber.
  • Particles>40 ⁇ m will fall back down into the reactor, while smaller particles ⁇ 40 ⁇ m (fines) will enter a Soxhlet-filter through a u-formed tubing, connected to the separation chamber via a conical connection 106 mm long (4 inches).
  • a vibrator is mounted on the separation chamber, to loosen any particles on the inside walls.
  • all the catalysts used contain a nominal amount of cobalt of 20 wt % and 0.5 wt % Re, calculated assuming reduced catalysts with complete reduction of cobalt.
  • the actual metal loading as determined by XRF or ICP may vary up to ⁇ 10%, i.e. for cobalt between 18 and 22 w % of the total reduced catalyst weight.
  • Other promoters besides rhenium, specifically, platinum, iridium or ruthenium, can be employed. It is also possible to add a second promoter such as lanthanum oxide or a mixture of oxides of the lanthanides or other compounds which are difficult to reduce.
  • the catalyst support Before impregnation, the catalyst support may be precalcined at about 500° C. Impregnation is usually in one step, but multiple steps can also be employed, from a mixed aqueous solution of appropriate metal salts, generally of cobalt nitrate and perrhenic acid or alternatively ammonium perrhenate.
  • the impregnation technique generally used is the pore filling or “incipient wetness” method, in which the solution is mixed with the dry support until the pores are filled.
  • the definition of the end point of this method may vary somewhat from laboratory to laboratory so that an impregnated catalyst could have a completely dry appearance or a sticky snow-like appearance. However, in no instances are there are any free flowing liquid present.
  • the impregnation technique may encompass all available methods besides incipient wetness, such as precipitation, impregnation from slurry with surplus liquid, chemical vapour deposition etc. It is well known that the impregnation method may influence the dispersion of the active metal (cobalt) and hence the catalytic activity, but as the Fischer-Tropsch reaction is believed to be non-structure sensitive, dispersion should not influence the selectivity
  • the impregnated catalyst is dried, typically at 80-120° C., to remove water from the catalyst pores, and then calcined at typically 200-450° C., e.g. at 300° C. for 2-16 h.
  • One critical step before testing is the activation of the catalyst that involves reduction of cobalt oxide(s) to cobalt metal.
  • This reduction can be performed by flowing a suitable reductive gas over the catalyst particles.
  • a suitable reductive gas can be mixed with inerts like nitrogen, noble gases or steam and suitable temperatures and pressures should be applied.
  • a fluidised bed reactor it may be convenient to use a recycle of (part of) the reductive gas and a slight atmospheric total overpressure in order to achieve a suitable gas flow. It is also possible to use elevated total pressures, eg. up to 8 bar or higher, or even the Fischer-Tropsch reactor pressure. Selection of the reduction temperature strongly depends on the actual catalyst formulation, in particular on the presence and nature of promoters. It is well known that Re is highly efficient as a promoter in achieving high reducibilities at a conveniently reduced temperature.
  • the first column relates to the first impregnation and calcination, showing the impregnated metal (with “---” indicating no impregnation) and the temperature of calcination.
  • the second column relates to the second impregnation (with cobalt) and calcination, showing the cobalt and rhenium contents. Calcination was carried out at about 300° C.
  • a particular feature can be observed in the pore size distribution diagram of the catalysts ( FIG. 2 ), or the modified supports, plotted as differential pore volume as a function of pore diameter from the BET measurements with nitrogen.
  • the pore size distribution of the Al-2 is bimodal, but the degree of bimodality decreases with calcination temperature of the modified support, concurrent with enhancement of strength and C5+ selectivity.
  • FIG. 1 shows the effect of Ni loading and calcination temperature on the strength of modified Al-2 supports.
  • FIG. 2 shows temperature effect on the pore size distribution of catalysts employing the modified catalyst supports, prepared by high temperature calcination of 5 wt % Ni as nickel nitrate impregnated on ⁇ -alumina.

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