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

A technology for catalytic pyrolysis and liquid fuels, which is applied in the fields of biofuels, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., and can solve the problems of deactivation of catalyst carbon deposits, difficulty in separation and recovery, and ineffective recycling of catalysts. It is convenient for recycling and promotes the effect of decarbonylation

Active 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] ZrO 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 ZrO 2 -Fe 3 o 4 Preparation: Transfer all the suspension in step (1) into a three-necked flask, heat up to 65°C under stirring, and measure 100g of ZrOCl 2 ·8H 2 The 0.5mol / L solu...

Embodiment 2

[0027] Adopt the 51.6g magnetic ZrO 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 rapidly pyrolyzed at 480°C for 20s under nitrogen atmosphere, and the yield of liquid product was 57%. The collected liquid product was analyzed, and its moisture content was 26%, its higher heating value was 20.8MJ / kg, its pH value was 4.8, and its kinematic viscosity at 40°C was 6cSt.

Embodiment 3

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

[0030] Measure the palladium nitrate dihydrate of 1.30g and be dissolved in deionized water, the 51.6g ZrO 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, 52.1 g of Pd-loaded mesoporous ZrO 2 (Pd / ZrO 2 ), where the loading of Pd was 1%.

[0031] The above magnetic Pd-ZrO 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 30:1, and then the mi...

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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 zirconium-based catalyst. Magnetic ZrO2-Fe3O4 or magnetic Pd-ZrO2-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 zirconium-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 zirconium-based catalyst. Background technique [0002] Biomass rapid pyrolysis is a process in which biomass is rapidly thermally decomposed under anaerobic conditions and then the pyrolysis products are rapidly condensed to obtain liquid bio-oil. It is a new and efficient biomass energy utilization technology. Bio-oil is expected to be used as a new type of liquid fuel to replace fossil fuels in various thermal equipment. However, the fuel grade of conventional primary bio-oil is poor, mainly as follows: high moisture content, high oxygen content, low calorific value, acidity and corrosion, poor thermal and chemical stability, and incompatibility with fossil fuels. Therefore, bio-oil needs to be refined to improve its fuel grade. Different scholars have proposed a v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00B01J23/745B01J23/89
CPCY02E50/10
Inventor 陆强张智博董长青杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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