Loaded solid phase metal catalyst for magnesium desulfurization process, and preparation method thereof

A metal catalyst and magnesium desulfurization technology, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of secondary pollution of catalysts, achieve high reuse rate, high efficiency, and avoid secondary pollution The effect of pollution problems

Active Publication Date: 2014-08-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By improving the oxidation reaction rate of magnesium sulfite, the catalyst solves the fouling and clogging problems of the desulfurization system caused by the high concentration of magnesium sulfite, effectively reduces the investment and energy consumption of the oxidation system, and solves the secondary pollution of the catalyst problems, and can realize the recovery and reuse of solid-phase catalysts, which greatly saves the cost

Method used

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  • Loaded solid phase metal catalyst for magnesium desulfurization process, and preparation method thereof
  • Loaded solid phase metal catalyst for magnesium desulfurization process, and preparation method thereof
  • Loaded solid phase metal catalyst for magnesium desulfurization process, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the catalytic effect of different concentration supported solid-phase metal catalysts

[0033] Weigh Co(NO 3 ) 2 ·6H 2 O0.9688g, Fe(NO 3 ) 3 9H 2 O2.8386g, Mn(NO 3 ) 2 4H 2 O2.6779g and Ni(NO 3 ) 2 ·6H 2 0.9720g, uniformly mixed and made into an aqueous solution; and 20.002g of 4A type molecular sieve after pretreatment was weighed, mixed with the configured nitrate solution, shaken at a constant speed of 120r / min for 8 hours, and left standstill for 24 hours. After filtering and washing with deionized water several times, drying at 120° C. for 10 hours, and calcining at 500° C. for 5 hours, a supported solid-phase metal catalyst was obtained.

[0034] Take the prepared catalyst and add it to the absorption slurry of five parallel magnesium desulfurization systems, the concentration of the catalyst is 10g L -1 , 20g·L -1 , 40g·L -1 , 80g·L -1 and 160g·L -1 , to compare their catalytic effects under the same reaction conditions.

[0035] Ex...

Embodiment 2

[0036] Embodiment 2: the catalytic effect of the loaded solid-phase metal catalyst of different active ingredient ratios

[0037] case2:

[0038] Weigh Co(NO 3 ) 2 ·6H 2 O0.4745g, Fe(NO 3 ) 3 9H 2 O0.3300g, Mn(NO 3 ) 2 4H 2 O0.4084g and Ni(NO 3 ) 2 ·6H 20.2375g, uniformly mixed and made into solution; and take by weighing 20.002g of 4A type molecular sieve after the pretreatment, it is mixed with the nitrate solution that configures, shake table constant speed 120r / min vibration 6 hours, leave standstill 24 hours, After filtering and washing with deionized water several times, drying at 110° C. for 12 hours, and calcining at 400° C. for 6 hours, a supported solid-phase metal catalyst was obtained. Take 4.002g of the prepared catalyst and add it to the absorption slurry of the magnesium desulfurization system, so that the catalyst concentration is 20g L -1 , the catalytic rate increased by about 0.50 times compared with the non-catalytic condition.

[0039] case3:...

Embodiment 3

[0048] Embodiment 3: the catalytic effect of the loaded solid-phase metal catalyst of different loads

[0049] case7:

[0050] Weigh Co(NO 3 ) 2 ·6H 2 O0.1493g, Fe(NO 3 ) 3 9H 2 O0.4374g, Mn(NO 3 ) 2 4H 2 O0.4127g and Ni(NO 3 ) 2 ·6H 2 0.1497g, uniformly mixed and made into solution; and 20.002g of 4A type molecular sieves after pretreatment was weighed, mixed with the configured nitrate solution, shaken at a constant speed of 120r / min for 7 hours, and left standstill for 24 hours. After filtering, washing with deionized water several times, drying at 130°C for 12 hours, and calcining at 600°C for 4 hours, a supported solid-phase metal catalyst with a loading capacity (mass fraction of total metal ions in the catalyst) of 1% was obtained. Take 4.002g of the prepared catalyst and add it to the absorption slurry of the magnesium desulfurization system, so that the catalyst concentration is 20g L -1 , the catalytic rate increased by about 0.42 times compared with the...

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Abstract

The present invention discloses a loaded solid phase metal catalyst for a magnesium desulfurization process, and a preparation method thereof, and belongs to the field of flue gas desulfurization. The preparation method comprises: preparing nitrates of cobalt (II), iron (III), manganese (II) and nickel (II) into solutions, and loading the solutions on a porous spherical molecular sieve through a dynamic dipping method to obtain the loaded solid phase metal catalyst, wherein the dynamical dipping method comprises steps of vibration with a shaking table, standing, filtration, drying and calcination. According to the present invention, the raw materials are common and easily-available, the preparation process is simple, the catalysis effect of the product is significant, and the catalyst can be widely used for magnesium desulfurization systems of small and medium sized boilers having the size of more than 75 t in our country, wherein the oxidation efficiency of the sulfite oxidation system is increased by more than 50% under the condition of no change of the original oxidation wind amount; and the catalyst has characteristics of low effective component consumption, easy recovery, low solution residue, no secondary pollution problem, and promotion values.

Description

technical field [0001] The invention belongs to the field of supported metal catalysts, in particular to a supported solid-phase metal catalyst used in a magnesium desulfurization process and a preparation method thereof, which is used for oxidation of magnesium sulfite, a by-product in the magnesium desulfurized process. Background technique [0002] SO 2 It is an important precursor of pollution phenomena such as acid rain and haze, and has caused great harm to my country's atmospheric environment in recent years. Magnesium desulfurization is currently a commonly used flue gas treatment process for small and medium-sized industrial boilers. However, due to the relatively slow oxidation reaction rate of the by-product magnesium sulfite, the investment and energy consumption of the desulfurization by-product recovery process are relatively high, and the oxidation of magnesium sulfite is slow. Sufficient status is also likely to cause problems such as system fouling, blockag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J29/16B01D53/78B01D53/50
Inventor 汪黎东崔帅刘爽尹子珺
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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