Method for adjusting titanium-tungsten carrier pore passage in waste SCR denitration catalyst and application

A technology for SCR catalysts and denitrification catalysts, which is applied in the field of adjusting the pores of titanium and tungsten carriers in waste SCR denitrification catalysts. It can solve the problems that cannot be directly and completely reused to prepare new catalysts, and achieve stability maintenance, pore structure optimization, and loose pore structure. Effect

Active Publication Date: 2021-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The pore volume of spent SCR catalysts is generally 0.2 mL/g-0.25mL/g, which is much larger than that of denitration titanium dioxide or t

Method used

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  • Method for adjusting titanium-tungsten carrier pore passage in waste SCR denitration catalyst and application

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Embodiment 1

[0045] This embodiment provides a method for adjusting the pore structure of the titanium-tungsten carrier in the spent SCR denitration catalyst, the method comprising the following steps:

[0046] Step 1: Purging the waste SCR catalyst, washing with deionized water, and grinding to obtain waste SCR denitration catalyst powder, sieving the waste SCR denitration catalyst powder, and selecting waste SCR denitration catalyst powder with a particle size range of less than 150 μm.

[0047] Step 2: Pour 1 part of the sieved waste SCR denitration catalyst powder into 6 parts of sodium hydroxide solution, the mass concentration of the sodium hydroxide solution is 5%. Mix the waste SCR denitrification catalyst powder and sodium hydroxide solution evenly, pump it into the reaction kettle, and seal the reaction kettle, react with alkali at 240°C, 100 rpm-120 rpm for 4 hours, cool and filter to obtain once sediment.

[0048] Step 3: Clean the primary sediment by using the three-stage cou...

Embodiment 2

[0054] This embodiment provides a method for adjusting the pore structure of the titanium-tungsten carrier in the spent SCR denitration catalyst, the method comprising the following steps:

[0055] Step 1: Purging the waste SCR catalyst, washing with deionized water, and grinding to obtain waste SCR denitration catalyst powder, sieving the waste SCR denitration catalyst powder, and selecting waste SCR denitration catalyst powder with a particle size range of less than 150 μm.

[0056] Step 2: Pour 1 part of the sieved spent SCR denitration catalyst powder into 5 parts of sodium hydroxide solution, the mass concentration of which is 3%. Mix the waste SCR denitrification catalyst powder and sodium hydroxide solution evenly, pump it into the reaction kettle, and seal the reaction kettle, react with alkali at 300°C, 100 rpm-120 rpm for 6 hours, cool and filter to obtain once sediment.

[0057] Step 3: Clean the primary sediment by using the three-stage countercurrent washing meth...

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Abstract

The invention discloses a method for adjusting a titanium-tungsten carrier pore passage in a waste SCR denitration catalyst and application, and the method comprises the following steps: placing the waste SCR denitration catalyst in a sodium hydroxide solution for slurrying heat treatment to obtain a primary precipitate; and cleaning the primary precipitate, slurrying to obtain alkali treatment slurry, and carrying out carbonation treatment on the alkali treatment slurry to obtain a secondary precipitate; and slurrying the secondary precipitate to obtain acid treatment slurry, adding a sulfuric acid solution into the acid treatment slurry, and adjusting the pH of the acid treatment slurry to a preset pH value to obtain a tertiary precipitate; and washing the tertiary precipitate with water, and drying to obtain the titanium-tungsten carrier with the adjusted pore structure. By adding alkali into the waste SCR denitration catalyst, performing heat treatment and soaking and then performing secondary acidification treatment, the pore channel structure of the recycled titanium-tungsten carrier can be effectively adjusted, the pore volume of the titanium-tungsten carrier can reach 0.40cm < 3 >/g or above, the pore volume requirement that the titanium-tungsten carrier is applied to preparation of a new SCR denitration catalyst is fully met, and generation of salt-containing wastewater can also be reduced.

Description

technical field [0001] The present application relates to the technical field of solid waste recycling and utilization, and in particular to a method and application for regulating the pores of titanium-tungsten carriers in waste SCR denitration catalysts. Background technique [0002] At present, the catalysts used in the flue gas denitration purification devices equipped with most power plants and boilers in my country are mainly medium and high temperature SCR denitration catalysts, and the TiO contained in the SCR denitration catalysts 2 as the carrier, V 2 o 5 as the main active ingredient, WO 3 and MoO 3 It is an anti-oxidation and anti-toxic auxiliary ingredient. The SCR denitrification catalyst is deactivated due to poisoning of catalytic substances after a period of use (such as the attachment of heavy metal arsenic and other substances to cause the active component V 2 o 5 Deactivation), mechanical structure damage (such as pore structure blockage, collapse, ...

Claims

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Application Information

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IPC IPC(8): B01J38/02B01J38/64B01J38/60B01J32/00B01J23/30B01D53/88B01D53/86B01D53/56
CPCB01D53/8628B01D53/88B01D2255/20707B01D2255/20776B01J23/30B01J38/02B01J38/60B01J38/64
Inventor 李会泉王兴瑞王晨晔刘晋隆
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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