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Cobalt-based catalyst for controlling distribution of Fisher-Tropsch synthetic products and application thereof

A cobalt-based catalyst and Tropsch synthesis technology, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, liquid hydrocarbon mixture recovery, etc., can solve the complex catalyst preparation process and the selectivity of heavy hydrocarbons High, low CO conversion rate and other issues

Active Publication Date: 2012-08-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that some oxygen-containing compounds are easily generated on the Fischer-Tropsch iron-based catalyst, which affects the quality of liquid fuel, and its catalyst preparation needs to be carried out under negative pressure, and the catalyst preparation process is complicated
Haiquan Su et al. (Appl.Clay.Sci.2009, 46, 325-329) and K.Sapag et al. (J.Mol.Catal.A: Chem.2001, 167, 81-89) reported the use of Al 2 o 3 -Layer montmorillonite-supported cobalt catalysts are used in Fischer-Tropsch synthesis reactions. The main disadvantage is that due to the relatively weak acidity of the single oxide layer montmorillonite, long-chain alkanes cannot be completely and effectively cracked, and the product selectivity is poor and the product distribution is poor. Wide, cannot directly synthesize gasoline, diesel distillate liquid fuel
The inventor's research group studied the SiO 2 - Layered pillared montmorillonite and ZrO 2 -Layered pillar montmorillonite supported cobalt catalyst is applied to Fischer-Tropsch synthesis reaction (Ind.Eng.Chem.Res., 2010.), the main disadvantage is the low conversion rate of CO, C 21 High selectivity for heavy hydrocarbons above

Method used

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  • Cobalt-based catalyst for controlling distribution of Fisher-Tropsch synthetic products and application thereof
  • Cobalt-based catalyst for controlling distribution of Fisher-Tropsch synthetic products and application thereof
  • Cobalt-based catalyst for controlling distribution of Fisher-Tropsch synthetic products and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preparation of columnar montmorillonite

[0033] Disperse 15g of montmorillonite in deionized water, stir vigorously to make it fully disperse and swell, and prepare 500g of montmorillonite suspension with a mass fraction of 3%; 500g of SiO 2 / ZrO 2 - Add the columning agent to 500g montmorillonite suspension, stir at 60°C for 12 hours, centrifuge at 8000 rpm for 5-15 minutes, wash with distilled water until there is no chloride ion, dry in an oven at 90°C for 12 hours, and place in a muffle furnace Calcined at 500°C for 4 hours to prepare SiO 2 / ZrO 2 -Laminated columnar montmorillonite. As-prepared SiO 2 / ZrO 2 -Pillared montmorillonite with low temperature N 2 Characterized by gas absorption and desorption, its specific surface area is 246m 2 / g, the pore volume is 0.35cm 3 / g, the average pore diameter is 4.6nm.

[0034] SiO above 2 / ZrO 2 -The columning agent is prepared according to the literature (Moreno, S.; Kou, R.S.; Molina, R.; Poncelet, G.J.Cat...

Embodiment 2

[0038] In step 2 of the preparation of cobalt-based catalysts in Example 1, the SiO prepared in step 1 was weighed according to the loading of metal Co as 5% and the loading of noble metal Pt as 0.1%. 2 / ZrO 2 - layer pillar montmorillonite, cobalt nitrate hexahydrate, chloroplatinic acid, other steps of this step are the same as in Example 1. Other steps are identical with embodiment 1, prepare Pt-Co / SiO 2 / ZrO 2 - Pillared montmorillonite catalysts.

Embodiment 3

[0040] In step 2 of the preparation of cobalt-based catalysts in Example 1, the SiO prepared in step 1 was weighed according to the loading of metal Co as 25% and the loading of noble metal Pt as 0.5%. 2 / ZrO 2 - layer pillar montmorillonite, cobalt nitrate hexahydrate, chloroplatinic acid, other steps of this step are the same as in Example 1. Other steps are identical with embodiment 1, prepare Pt-Co / SiO 2 / ZrO 2 - Pillared montmorillonite catalysts.

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Abstract

The invention relates to a cobalt-based catalyst for controlling distribution of Fisher-Tropsch synthetic products, which is characterized in that layer column montmorillonite is taken as a carrier; a first active component is metal Co; a second active component is Pt or Pd or Ru; the specific surface area of the layer column montmorillonite is 100 to 700m<2> / g, the specific pore volume is 0.1 to1.0cm<3> / g, and the pore size distribution is 0.5 to 50nm; the charge capacity of the metal Co is 5% to 25%; and the charge capacity of the Pt or the Pd or the Ru is 0.1% to 0.5%. Compared with the traditional Co / SiO2 catalyst, the cobalt-based catalyst of the invention inhibits the generation of long-chain hydrocarbon and heavy hydrocarbon generated through effective cracking by utilizing the shape selecting action of the layer column montmorillonite duct and the surface acidity of the layer column montmorillonite; and the distribution of the Fisher-Tropsch products is effectively controlledso that the products are distributed and centralized in hydrocarbon products with C4 to C20 gasoline and diesel fraction sections.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for selectively controlling the distribution of Fischer-Tropsch products to synthesize liquid fuels. Background technique [0002] Fischer-Tropsch Synthesis (Fischer-Tropsch Synthesis), discovered by German scientists Fischer and Tropsch in 1923, is a key process for converting coal, natural gas and biomass into clean liquid fuels through synthesis gas. With the shortage of oil supply and the deteriorating environment, the requirements of environmental protection laws for transportation fuels are getting higher and higher. Clean liquid fuels are synthesized from coal, natural gas or biomass through syngas through Fischer-Tropsch synthesis, and people are getting more and more Come higher attention. However, Fischer-Tropsch synthesis products follow the Anderson-Schulz-Flory (ASF) distribution, and the product distribution is relatively wide. The selectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C07C1/04C10G5/00
Inventor 刘忠文郝青青王光伟刘昭铁
Owner SHAANXI NORMAL UNIV