Manganese oxide nanotube loading type denitration catalyst and preparation method therefor

A denitration catalyst and nanotube technology, which is applied in the field of air pollution control, can solve the problems of denitration catalyst resistance to multiple poisons and less research on poisoning at the same time, and achieve excellent resistance to alkali/alkaline earth metals, good water resistance and sulfur resistance, and low sulfur dioxide. The effect of oxidation rate

Active Publication Date: 2016-12-07
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the published patents at home and abroad mainly involve various types of SCR denitrification catalysts and their preparation methods, but there are few studies on the simultaneous poisoning of denitrification catalysts against multiple poisons

Method used

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  • Manganese oxide nanotube loading type denitration catalyst and preparation method therefor
  • Manganese oxide nanotube loading type denitration catalyst and preparation method therefor

Examples

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Effect test

Embodiment 1

[0043]Preparation of manganese oxide nanotubes: The molar ratio of raw materials is potassium permanganate: dilute hydrochloric acid: water = 1:5:80. Add potassium permanganate and dilute hydrochloric acid into deionized water together, stir and dissolve for 1 hour to form a precursor solution; then pour it into a PTFE-lined hydrothermal kettle and heat it at 150°C for 24 hours, the filling degree of the hydrothermal kettle is 70%; the precipitate obtained by hydrothermal washing is washed with deionized water several times to a pH value ≥ 5, then it is filtered, and dried at 60°C, the microscopic morphology of the obtained manganese oxide titanium nanotubes is as follows figure 1 shown.

[0044] Catalyst preparation: Add 1 g of cerium nitrate hexahydrate and 2 g of ammonium tungstate to 100 ml of deionized water, stir and dissolve for 1 hour, add 4 g of manganese oxide nanotubes into it and continue stirring for 6 hours, then dry at 60 ° C, 450 ℃ burning for 3 hours to obtai...

Embodiment 2

[0048] Preparation of manganese oxide nanotubes: The molar ratio of raw materials is potassium manganate:dilute nitric acid:water=1:10:120. Add potassium permanganate and dilute hydrochloric acid into deionized water together, stir and dissolve for 2 hours to form a precursor solution; then pour it into a PTFE-lined hydrothermal kettle and heat it at 180°C for 24 hours, the filling degree of the hydrothermal kettle was 60%; the precipitate obtained by hydrothermal treatment was washed with deionized water several times until the pH value was ≥ 5, then it was filtered and dried at 80°C.

[0049] Catalyst preparation: Add 1 gram of vanadyl sulfate pentahydrate and 2 grams of ammonium molybdate into 100ml of deionized water, stir and dissolve for 1 hour, add 4g of manganese oxide nanotubes into it and continue stirring for 6 hours, then dry at 80°C. Burn at 500°C for 3 hours to obtain the finished catalyst.

[0050] Catalyst denitrification performance test: Put the finished cat...

Embodiment 3

[0053] Preparation of manganese oxide nanotubes: The molar ratio of raw materials is manganese acetate: acetic acid: water = 1:8:100. Add manganese acetate and acetic acid into deionized water together, stir and dissolve for 2 hours to form a precursor solution; then pour it into a PTFE-lined hydrothermal kettle and heat it at 130°C for 24 hours, and the filling degree of the hydrothermal kettle is 70% ; The precipitate obtained by hydrothermal treatment was washed with deionized water several times to a pH value ≥ 5, then filtered, and dried at 60°C.

[0054] Catalyst preparation: Add 1 g of niobium oxalate and 2 g of ammonium molybdate into 100 ml of deionized water, stir and dissolve for 1 hour, add 4 g of manganese oxide nanotubes into it and continue stirring for 6 hours, then dry at 60°C and burn at 400°C The finished catalyst was obtained in 3 hours.

[0055] Catalyst denitrification performance test: Put the finished catalyst prepared above into a fixed-bed quartz rea...

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Abstract

The invention discloses a manganese oxide nanotube loading type denitration catalyst and a preparation method therefor. The catalyst is prepared from a carrier, an active substance and a catalysis assistant, wherein the active substance and the catalysis assistant are loaded to the carrier; the carrier is manganese oxide nanotubes; and the active substance is an oxide of cerium, vanadium, niobium, chromium, iron or copper, and the catalysis assistant is an oxide of molybdenum or tungsten. According to the denitration catalyst disclosed by the invention, superior denitration activity can be obtained; and meanwhile, the denitration catalyst has good capacity for resisting the simultaneous poisoning of a variety of toxicants (phosphate, heavy metals and alkalis/alkaline-earth metals), a powerful guarantee is provided for the long-term effective use of SCR denitration catalysts in glass kilns, cement kilns, garbage incinerators and biomass fuel boilers, and the service life of the denitration catalyst used in the traditional industrial boiler can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a manganese oxide nanotube-loaded denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, severe smog has occurred in most parts of my country, which lasts for a long time and has high pollution concentrations. Under such environmental conditions, the Chinese government regards environmental protection as a basic national policy and has elevated it to a historical mission. NO x As one of the chief culprits of smog, its emission reduction is particularly important. my country has promulgated a number of laws and regulations to control NO x emissions. in NO x In terms of emission control, power plants, cement, steel, and industrial boilers have become key emission control targets. At the same time, for non-power plant industries such as cement kilns, waste incinerators, and glass furnaces, the reduction of nitrogen ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01D2255/40B01J23/002B01J23/34B01J23/8892B01J2523/00B01J2523/3712B01J2523/69B01J2523/72B01J2523/55B01J2523/68B01J2523/56B01J2523/17B01J2523/842B01J2523/67
Inventor 王海强王芃芦吴忠标陈思
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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