Preparation method and utilization method of catalyst originated from waste

A catalyst and waste technology, applied in the field of catalyst preparation and utilization from waste, can solve the problems of activation effect change, water pollution, complexity, etc.

Active Publication Date: 2018-05-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process of first carbonization and then activation is very complicated, and the activation effect will also change with the changes of different variables in the process; for the process of physical activation, waste materials (such as sludge, pig manure, cow manure, biomass ) after carbonization, using water vapor, carbon dioxide and other high-temperature media to contact with it will consume a lot of energy [Kojima N, Mitomo A, Itaya Y, et al. Adsorption removal of pollutants by active cokes produced from sludge in the energy recycle process of wastes[J]. Waste Management. 2002(22): 399-404. Jindarom C, Meeyoo V, Kitiyanan B, et al. Surface characterization and...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A batch of dewatered municipal sludge with a moisture content of about 78% has a dry base low calorific value of about 14MJ / kg; if it is disposed of by incineration, energy needs to be supplemented. KOH is directly mixed into the sludge with a moisture content of 78% according to KOH: dry basis mass = 1:1, fully stirred with a stirrer for 35 minutes, then dried to a moisture content below 25%, and sent to an oxygen-free pyrolysis reactor. Heating to 650°C for anaerobic pyrolysis reaction, one step to obtain activated coke, washing with water, dehydration and drying, the obtained catalyst is rich in oxygen-containing functional groups, with a specific surface area of ​​178.53 m 2 / g, mesopore volume 0.161cm 3 / g, the most probable pore size is 1.85nm, which has good activity.

[0062] The catalyst is made into particles with a diameter of ø4mm and a length of 5-6 mm by using a twin-screw extrusion granulator in the prior art, and placed in a reforming reactor connected ...

Embodiment 2

[0066] A batch of oil sludge with a moisture content of about 70% has a low calorific value of about 21MJ / kg on a dry basis; if incineration is used, a higher investment in flue gas purification is required. The prepared saturated Fe(NO 3 ) 3 and Mn(NO 3 ) 2 solution (control Fe 3+ / Mn 2+ The molar ratio is 1:0.5) added to the oil sludge with a water content of about 70% to control the Fe(NO 3 ) 3 and Mn(NO 3 ) 2The mass ratio of the sum of the crystal mass and the dry oil sludge is 1:1, fully stirred with a stirrer for 45 min, then dried to a moisture content below 18%, sent to an anaerobic pyrolysis reactor, heated to 900°C for anaerobic thermal Decomposition reaction, one step to obtain activated coke, washed with water until the pH is about 7, dehydrated and dried, the obtained catalyst is rich in oxygen-containing functional groups, with a specific surface area of ​​380.9m 2 / g, mesopore volume 0.275cm 3 / g, the most probable pore size is 1.90nm, it has good act...

Embodiment 3

[0070] The moisture content of a batch of reed straw is about 25%, and its dry base low calorific value is about 15MJ / kg; if combustion power generation is used, the highest price is about 450 yuan / ton. Due to the high harvesting and transportation costs, farmers are not motivated. Adopt technology of the present invention to pulverize it and make particle size less than 15mm, the prepared Fe(NO 3 ) 3 and Ni(NO 3 ) 2 solution (control Fe 3+ / Ni 2+ The molar ratio is 1:0.6) evenly sprayed in the straw powder with a moisture content of about 25% to control the Fe(NO 3 ) 3 and Ni(NO 3 ) 2 The mass ratio of the sum of the crystal mass of the straw to the dry straw is 1:5, fully stirred with a stirrer for 45 min, then dried to a moisture content below 18%, sent to an anaerobic pyrolysis reactor, and heated to 800°C for anaerobic thermal Decomposition reaction, one step to obtain activated coke, washed with water until the pH is about 7, dehydrated and dried, the obtained ca...

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Abstract

The invention relates to a preparation method and a utilization method of a catalyst originated from waste. The preparation method which is a one-step activation method comprises the following steps:mixing one or more of KOH or K2CO3,Fe3<+>, manganese nitrate and nickel nitrate in proportion in sludge or biomass; fully stirring the mixture; then carrying out an anaerobic pyrolytic reaction on thestirred sludge or biomass at 650-900 DEG C to obtain activated coke in one step; and then cleaning the activated coke with clean water, and dehydrating and airing the same to obtain the catalyst. Thecatalyst powder or a formed substance used at 100-360 DEG C can obtain the denitration efficiency of over 80%. The catalyst can promote tar cracking, no tar is discharged in the preparation process and energy is self-supplied; and the catalyst which is deactivated is pollution-free.

Description

technical field [0001] The invention belongs to the technical field of harmless and resourceful treatment of waste, and specifically relates to a method for preparing and utilizing a catalyst derived from waste, which can utilize sludge, pig manure, cow dung, medicine, etc. without secondary pollution. Catalysts are produced from slag, agricultural and forestry wastes, and no additional CO emissions are caused when the catalyst is used; gas can also be recovered after the catalyst is deactivated. Background technique [0002] Carbon-based catalysts are widely used and can be used in the treatment of wastewater containing heavy metals and refractory organic pollutants. For example, the patent application "a biochar catalyst, iron-carbon catalyst and its application" (CN201610168376.2 application date 2016.03.22) was published The preparation and application of a biochar catalyst and iron-carbon catalyst are described. The biochar catalyst uses biochar as a carrier and support...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/755B01J23/745B01J23/04B01D53/86B01D53/56
CPCB01D53/8628B01D2251/206B01D2251/2067B01J23/04B01J23/745B01J23/755B01J23/8892B01J35/026B01J35/04
Inventor 戴晓虎陈德珍陈慧戴翎翎
Owner TONGJI UNIV
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