Carried chromium-free high-temp. transformation catalyst and preparing process thereof

A high-temperature conversion and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of low-temperature conversion rate and heat resistance gap of catalyst products, and achieve small particles, uniform particle size, The effect of reducing dosage

Inactive Publication Date: 2003-03-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are chromium-free iron-based high-temperature shift catalysts produced by precipitation, mixing and flakes in the domestic market. Compared with traditional iron-chromium catalysts, the raw materials are the same except that chromium is replaced by other metal oxides. The preparation method The same, but there is still a certain gap in the low-temperature conversion rate and heat resistance of its catalyst products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: A supported chromium-free high-temperature shift catalyst with activated carbon as a carrier and its preparation method. The specific surface area is 900M 2 / g of carrier-grade activated carbon at 2mol dm -3 Reflux in a hydrochloric acid solution for 8 hours to remove impurities such as zinc and lead, then wash until there is no chloride ion in the washing solution, and dry at 110°C. Mix measured amounts of Fe and M soluble salts into a solution, wherein the ratio of Fe(III) / Fe(II) is 2:1, and M uses metal vanadium. Add this solution into a container with activated carbon, and the amount of solution added , should be based on the activated carbon that has just been immersed, keep the vacuum degree of 10Kpa, vacuum impregnate twice, impregnate and dry the second impregnation, so that the impregnation liquid is absorbed by the activated carbon, and then slowly add 10-20% ammonia water to When the pH value is ≥9, the metal salts of Fe and M in the solution are...

Embodiment 2

[0074] Embodiment 2: A supported chromium-free high-temperature shift catalyst with activated carbon as a carrier and its preparation method. The specific surface area is 950M 2 / g of carrier-grade activated carbon at 1mol dm -3 Reflux in the hydrochloric acid solution for 4 hours to remove impurities such as zinc and lead, then wash until there is no chloride ion in the washing solution, dry at 110°C, and then dry at 4mol·dm -3 react in nitric acid for 2 hours, wash with deionized water until the pH value is equal to 5, and dry at 110°C. Mix measured amounts of Fe and M soluble salts into a solution, wherein the ratio of Fe(III) / Fe(II) is 2.5:1, M is nickel metal, and this solution is added to a container with activated carbon, and the amount of solution added , should be based on the activated carbon that has just been immersed, keep the vacuum degree of 10Kpa, vacuum impregnate twice, impregnate and dry the second impregnation, so that the impregnation liquid is absorbed ...

Embodiment 3

[0075] Example 3: A supported chromium-free high-temperature shift catalyst with magnesium-aluminum spinel as a carrier and its preparation method. The specific surface area is 250M 2 / g γ-Al 2 o 3 Powder, magnesium nitrate as reactant. Prepare an aqueous solution of magnesium nitrate according to the molar ratio of magnesium oxide to aluminum oxide 1:1, evaporate to dryness on a rotary evaporator after impregnation, dry at 100-150°C and roast at 400-950°C for 2-4 hours, then pulverize and take 200 The following materials are used as carriers. With the molar ratio of ferric nitrate and ethylene glycol as 1:20, reflux at 70°C for 8 hours to prepare γ-Fe 2 o 3 Sol. Quantitative γ-Fe will be prepared 2 o 3 The sol is impregnated on the magnesia-aluminum spinel by impregnation method, the supernatant is absorbed statically, and a certain amount of aqueous solution of potassium chromate, magnesium acetate, potassium carbonate and other additives is added, stirred and mixed ...

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Abstract

A carried non-chromium catalyst for high-temp conversion is characterized by that its active components are gamma-Fe2O3, K2O and MO chosen from CoO, NiO, V2O5 and their mixture and its carrier is activated carbon or Mg-Al spinel. Its preparing process includes activating surface of the carrier, vacuum impregnating at least twice, and precipitating if the activated carbon is used as carrier, or preparing gamma-Fe2O3 sol, impregnating, and mixing the M, K and Mg salts with the carrier carrying Fe sol if the Mg-Al spinel is used as carrier. Its advantages are environment protection, low consumption and wide temp range (275-600 deg.C).

Description

technical field [0001] The invention relates to a loaded CO high-temperature shift catalyst (abbreviated as a high-temperature shift catalyst), in particular to a catalyst with activated carbon or magnesium-aluminum spinel as a carrier, mainly loaded with iron oxide on its surface, and other non-chromium metal oxides Highly variable catalyst for additives. The metal oxides such as cobalt oxide CoO, nickel oxide NiO, vanadium oxide V 2 o 5 , together with oxides such as potassium and magnesium, form a semi-water gas shift process that can be applied to the ammonia synthesis system, and convert CO in the semi-water gas into CO with the participation of water vapor 2 and H 2 , A shift catalyst for the purpose of removing CO. Background technique [0002] It has been more than 80 years since the development of high shift catalysts for the CO shift process in the semi-water gas of the ammonia synthesis system. The iron-chromium high-stable catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C01B3/16
CPCY02P20/52
Inventor 杨平华南平杜玉扣宋海燕
Owner SUZHOU UNIV
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