Method for preparing liquid fuel by performing catalytic pyrolysis on biomass by using magnetic titanium-based catalyst

A technology for catalytic pyrolysis and liquid fuels, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc. problem, to achieve the effect of convenient recycling and good catalytic effect

Inactive Publication Date: 2012-09-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this refining method has not received widespread attention. The main reason is that after the pyrolysis reaction of the mechanically mixed biomass and the catalyst is completed, the catalyst and coke products are mixed together, and it is difficult to separate and recover, which leads to the ineffective recycling of the catalyst; , during the rapid pyrolysis of biomass, more products prone to carbon deposition will be produced, which will lead to the rapid carbon deposition and deactivation of the catalyst, which further limits the widespread use of this refining method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] TiO 2 -Fe 3 o 4 Preparation of:

[0023] (1) Preparation of magnetic matrix: Measure 30g of FeCl respectively 2 4H 2 O and 6g FeCl 3 ·6H 2 O was prepared into a 200mL mixed solution and added to a three-necked flask, placed in a constant temperature water bath at 65°C, and slowly dripped a NaOH solution with a concentration of 0.1mol / L while stirring until the pH value of the solution reached 12, and continued to stir at a constant temperature. Aging for 30 minutes; then the three-neck flask was removed from the constant temperature water bath and cooled to room temperature, the magnetic matrix and the supernatant were separated by a magnetic field, and then the magnetic matrix was washed repeatedly until neutral, and stored in a suspended state for future use.

[0024] (2) Magnetic TiO 2 -Fe 3 o 4 Preparation: measure 70g of TiCl 4 Slowly add it dropwise to distilled water cooled with ice water, and prepare a 0.5mol / L aqueous solution under stirring; measure ...

Embodiment 2

[0027] Adopt the 42.8g magnetic TiO that prepares in the embodiment 1 2 -Fe 3 o 4 Catalyst, all of which are ground to a particle size of about 0.5mm. Naturally air-dried poplar wood is used as raw material (average particle size is 2mm, moisture content is 8%), and the two are mechanically mixed. The ratio of poplar wood to catalyst Then the mixed material was sent into a fluidized bed rapid pyrolysis reactor through a screw feeder, and was rapidly pyrolyzed at 480°C for 20s under nitrogen atmosphere, and the yield of liquid product was 55%. The collected liquid product was analyzed, and its moisture content was 23%, its higher heating value was 21.8MJ / kg, its pH value was 5.1, and its kinematic viscosity at 40°C was 8cSt.

Embodiment 3

[0029] Pd-TiO 2 -Fe 3o 4 Preparation of:

[0030] Measure the palladium nitrate dihydrate of 1.08g and be dissolved in deionized water, the 42.8g TiO prepared in embodiment 1 2 -Fe 3 o 4 Add the above-mentioned salt solution, slowly drip ammonia water under the condition of stirring, until the pH value reaches about 9, continue to stir at room temperature for 12 hours, filter and dry at 100 °C for 3 hours in a common blast drying oven, and finally put the dry matter in the Reduction at 280 °C under hydrogen and nitrogen atmosphere (programmed temperature increase rate is 1 °C / min, holding time is 3 h), that is, 43.2 g of Pd-supported mesoporous TiO 2 (Pd / TiO 2 ), where the loading of Pd was 1%.

[0031] The above magnetic Pd-TiO 2 -Fe 3 o 4 All the catalysts are ground to a particle size of about 0.5mm. Dry poplar wood is used as raw material (average particle size is 2mm), and the two are mechanically mixed. The ratio of poplar wood and catalyst is 40:1, and then th...

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Abstract

The invention belongs to the field of utilization of biomass energy and particularly relates to a method for preparing liquid fuel by performing catalytic pyrolysis on biomass by using a magnetic titanium-based catalyst. Magnetic TiO2-Fe3O4 or magnetic Pd-TiO2-Fe3O4 which is used as a catalyst and biomass which is used as a raw material are subjected to mechanical mixing, the biomass is quickly pyrolyzed at the temperature of between 400 and 600 DEG C under an anaerobic condition, and pyrolysis gas is quickly cooled to room temperature so as to obtain the liquid fuel with high fuel quality. In the process of catalyzing the pyrolysis of the biomass by using the magnetic titanium-based catalyst, the forming of acid and aldehydes products can be effectively inhibited, and hydrocarbon products can be promoted to be formed, so that the high-level liquid fuel can be obtained. Moreover, the catalyst can be separated and recovered from solid residues by directly using an external magnetic field.

Description

technical field [0001] The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing liquid fuel by catalyzing and pyrolyzing biomass with a magnetic titanium-based catalyst. Background technique [0002] Bio-oil obtained from rapid pyrolysis and liquefaction of biomass is a new type of liquid product, which is expected to partially replace fossil fuels and be used in various thermal equipment. However, the fuel grade of primary bio-oil obtained by conventional rapid pyrolysis of biomass is poor, mainly as follows: high moisture content, high oxygen content, low calorific value, acidity and corrosion, poor thermal and chemical stability, inability to Miscible with fossil fuels, etc. Therefore, bio-oil needs to be refined to improve its fuel grade. Different scholars have proposed a variety of physical and chemical methods to refine bio-oil. Catalytic cracking is a very effective method. Oxygen to CO 2 , CO and H ...

Claims

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Application Information

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IPC IPC(8): C10G1/00B01J23/745B01J23/89
Inventor 陆强董长青杨勇平胡笑颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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