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A kind of composite catalyst and its preparation method and application

A composite catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve the problems of lack and lack of heterogeneous supercritical water oxidation catalysts, etc.

Active Publication Date: 2019-07-16
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, there is a lack of a stable and efficient heterogeneous supercritical water oxidation catalyst in this field, especially a supercritical water oxidation catalyst suitable for treating landfill leachate

Method used

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  • A kind of composite catalyst and its preparation method and application
  • A kind of composite catalyst and its preparation method and application
  • A kind of composite catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] In this example, TiCl 4 , Ce(NO 3 ) 3 , Mn(NO 3 ) 2 、KNO 3 and ammonia water as raw materials, the composite catalyst is prepared by co-precipitation method, comprising the following steps:

[0070] (1) Formulated with Ce 3+ Ionic metal salts, Mn 2+ Ionic metal salts and K + Ion metal salt solution: add Ce(NO 3 ) 3 , Mn(NO 3 ) 2 、KNO 3 to deionized water;

[0071] (2) Under ice-water bath conditions, slowly drop analytical pure TiCl into the metal salt solution obtained in step (1) 4 Liquid, control (Mn+Ce) / Ti molar ratio 1:9, TiO 2 Concentration 0.05~0.5mol / L, TiCl 4 with H 2 O reacts to generate HCl and TiO 2 And release a lot of heat; the prepared aqueous solution was ultrasonically oscillated with 450W power for 60min, left to age for 24h; then vigorously stirred at a speed of 300r / min, and ammonia water was added to adjust the pH to 10.0. Shaking for 24 hours, standing and aging for 12 hours.

[0072] (3) After aging in step (2), filter and wash ...

Embodiment 2

[0077] In this example, TiCl 4 , CeCl 3 , MnCl 2 , KCl and ammoniacal liquor are raw materials, and adopt co-precipitation method to prepare composite catalyst, comprise the following steps:

[0078] (1) Formulated with Ce 3+ Ionic metal salts, Mn 2+ Ionic metal salts and K + Ionic metal salt solution: add CeCl at the ratio of Ce / Mn molar ratio 2:3, K / Mn molar ratio 1:1 3 , MnCl 2 , KCl to deionized water;

[0079] (2) Under ice-water bath conditions, slowly drop analytical pure TiCl into the metal salt solution obtained in step (1) 4 Liquid, control (Mn+Ce) / Ti molar ratio 1:9, TiO 2 Concentration 0.05~0.5mol / L, TiCl 4 with H 2 O reacts to generate HCl and TiO 2 and release a lot of heat; the prepared aqueous solution was ultrasonically oscillated at 650W for 30min, and left to age for 12h; then vigorously stirred at a speed of 150r / min, and ammonia water was added to adjust the pH to 8.0. Shake at constant temperature for 48 hours, and stand and age for 24 hours. ...

Embodiment 3

[0085] In this example, TiCl 4 , Ce(NO 3 ) 3 , Mn(NO 3 ) 2 、KNO 3 And ammonia water is raw material, adopts impregnation method to prepare composite catalyst, comprises the following steps:

[0086] (1) Formulated with Ce 3+ Ionic metal salts, Mn 2+ Ionic metal salts and K + Metal salt solution of ions: Add Ce(NO 3 ) 3 , Mn(NO 3 ) 2 、KNO 3 to deionized water;

[0087] (2) Under ice-water bath conditions, the analytically pure TiCl 4 The liquid is slowly dropped into deionized water to generate TiO 2 , TiCl 4 with H 2 O reacts to generate HCl and TiO 2 And release a lot of heat, control TiO 2 Concentration 0.05~0.5mol / L, the prepared TiO 2 The aqueous solution was ultrasonically oscillated with a power of 650W for 30min, and left to age for 24h to obtain TiO 2 The clarified aqueous solution, and then add ammonia water, while stirring vigorously at a speed of 300r / min, until the pH is 8.0, to obtain a TiO-containing 2 The emulsion was filtered and washed, an...

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Abstract

The invention discloses a composite catalyst. Rutile TiO2 is used as a supporter and supports the active component manganese oxide, first aid cerium oxide and second aid potassium. The composite catalyst can be prepared by a coprecipitation method, impregnation method or redox precipitation method. The composite catalyst can be used for garbage leachate supercritical water oxidation treatment. The composite catalyst has the advantages of simple preparation method, high strength and favorable stability; the composite catalyst has favorable catalytic activity on garbage leachate supercritical water oxidation, so that the supercritical water oxidation reaction conditions are milder, and the removal efficiency of nondegradable substances is enhanced; and the composite catalyst is especially effective for removing ammonia nitrogen, and is beneficial to popularization of supercritical water oxidation in high-concentration organic wastewater treatment.

Description

technical field [0001] The invention belongs to the environmental protection technology, and in particular relates to a composite catalyst used in the field of environmental protection and its preparation method and application. Background technique [0002] With the continuous rapid development of the national economy and the rapid advancement of the urbanization process, the output of municipal solid waste is also increasing at an alarming rate. In 2014, the volume of domestic waste removal in my country was 179 million tons, and the volume of domestic waste removal in county towns was 66.57 million tons, totaling 245 million tons. At present, most cities still use sanitary landfills and piles to deal with domestic waste, which produces a large amount of landfill leachate. Landfill leachate has the characteristics of complex components, high content of ammonia nitrogen, high content of metal ions, imbalance of nutrient elements, and large changes in water quality. Landfi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34C02F1/72C02F101/16C02F103/06
CPCB01J23/002B01J23/34B01J2523/00C02F1/725C02F2101/16C02F2103/06B01J2523/13B01J2523/3712B01J2523/47B01J2523/72
Inventor 公彦猛姜伟立李爱民刘树洋周海云范亚民常闻捷
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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