Water-gas shift reaction method

A transformation reaction, water gas technology, applied in chemical instruments and methods, inorganic chemistry, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as high reaction temperature, easy spontaneous combustion of catalysts, poor start-stop stability, etc. Achieve the effect of high conversion rate at low temperature, good technical support, and non-spontaneous combustion

Active Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the prior art has the problems of high reaction temperature, poor start-stop stability, and easy spontaneous combustion of the catalyst, and provides a new method for water-gas shift reaction

Method used

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preparation example Construction

[0021] The specific steps of the method for preparing nano-zirconia provided by the present invention are as follows:

[0022] a) Dissolve the zirconium salt in water and prepare a solution, preferably at least one of zirconium nitrate, zirconyl nitrate, zirconium oxychloride and zirconium chloride;

[0023] b) Add alkali solution under stirring until the specified pH value is reached, and the end point pH value is in the range of 7-12;

[0024] c) Adjust the environment to 0~150℃, add a reflux device to let the precipitate reflux in the alkaline solution for 1~60 hours, and keep the mother liquor pH constant during the whole reflux process;

[0025] d) The precipitate is filtered, washed until no impurity ions, dried, and roasted. The drying temperature is 60-150°C, the drying time is 4 to 48 hours, the calcination temperature is 200-800°C, and the calcination time is 1-12 hours.

Embodiment 1～4

[0028] Dissolve zirconium nitrate, zirconium oxychloride, oxygen nitrate and zirconium chloride in deionized water to prepare 0.5mol L -1 Turn on the stirring, add concentrated ammonia water (mass fraction 37%) dropwise to pH=9 at a stirring speed of 300rpm, add a reflux device, raise the solution temperature to 100°C, and reflux for 48 hours. The precipitate is filtered and washed to be free of impurity ions, dried at 120°C, and calcined at 500°C for 4 hours to obtain nano-zirconia. Its structural characterization is shown in Table 1.

Embodiment 5～6

[0030] Dissolve zirconium oxychloride in deionized water and prepare 0.5mol L -1 Solution, turn on the stirring, add NaOH(2mol L -1 ) And KOH (2mol L -1 ) When the solution reaches pH=9, add a reflux device, raise the temperature of the solution to 100°C, and reflux for 48 hours. The precipitate is filtered and washed to be free of impurity ions, dried at 120°C, and calcined at 500°C for 4 hours to obtain nano-zirconia. Its structural characterization is shown in Table 1.

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Abstract

The invention relates to a water-gas shift reaction method which is mainly used for solving problems that reaction temperature is higher, start-stop stability is poor and a catalyst is spontaneously combustible in the prior art. The problem is better solved by means of the technical scheme as follows: the method comprises the step that water gas is contacted with the catalyst in a fixed bed reactor and CO2 and H2 are produced, wherein the catalyst is prepared from a) 0.1wt%-5wt% of at least one active component selected from Pt, Pd and Au and b) 95wt%-99.9wt% of a carrier, the carrier is nano-zirconia, and the specific surface area of nano-zirconia is larger than 100 cm<2> / g. The water-gas shift reaction method can be applied to industrial production of removal of CO in gas or regulation of CO-H2 ratio of synthesis gas by the aid of water-gas shift reaction.

Description

Technical field [0001] The invention relates to a method of water gas shift reaction. Background technique [0002] Clean, efficient, safe, and renewable hydrogen energy is regarded as the most promising energy source in the 21st century. Fuel cells are especially based on H 2 The proton exchange membrane fuel cell as fuel can directly convert chemical energy into electrical energy, without environmental pollution, and not restricted by the Carnot cycle. The energy conversion efficiency is 40-50%, which is much higher than that of heat engines. It also has the ability to quickly start at room temperature, No electrolyte loss, long life, high specific power and specific energy. However, currently about 95% of H 2 It is obtained from the reforming reaction of crude oil, coal, natural gas, etc. The reformed gas generally contains 1-10% CO, which will cause the platinum electrode in the fuel cell to be poisoned and severely decrease the performance of the fuel cell. [0003] At the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/16B01J23/52B01J23/42B01J21/06B01J32/00B01J35/10
CPCB01J21/066B01J23/42B01J23/52B01J35/1019C01B3/16Y02P20/52
Inventor 刘晓钰刘红星谢在库乔明华
Owner CHINA PETROLEUM & CHEM CORP
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