Preparation method of shell-core structure molecular sieve catalyst for biomass pyrolysis reforming upgrading

A biomass pyrolysis and molecular sieve technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, preparation of liquid hydrocarbon mixtures, etc., can solve problems such as product escape, insufficient surface acidity, poor catalytic effect, etc., and prolong service life , High skeleton stability, good for adsorption and diffusion

Pending Publication Date: 2021-01-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commonly used microporous molecular sieve HZSM-5, its microporous structure can allow part of the pyrolysis steam to enter the interior for further pyrolysis, and the surface has a strong acidity that can promote the further decomposition of organic matter on its surface, but due to the strong acidity, the pyrolysis products Contains more long-chain organic matter and for

Method used

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  • Preparation method of shell-core structure molecular sieve catalyst for biomass pyrolysis reforming upgrading
  • Preparation method of shell-core structure molecular sieve catalyst for biomass pyrolysis reforming upgrading

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preparation example Construction

[0028] The preparation method of the shell-core structure molecular sieve catalyst of the present invention comprises the following steps:

[0029] Step 1. Add a certain amount of deionized water into the beaker, measure 40% TPAOH solution and add it to the deionized water, then weigh HZSM-5 molecular sieve powder and add it to the solution for rapid stirring. Place it on a magnetic stirrer at 35-60 Stir well at °C. After 1 hour, weigh and dissolve the template agent CTAB into a 10% concentration solution, add it to the suspension, and stir thoroughly at 15-30°C for 1 hour.

[0030] Step 2. After fully stirring the suspension in step 1, move it to a tetrafluoroethylene-lined autoclave, place the autoclave in an oven, and digest it for 12 to 36 hours at 90 to 120°C.

[0031] Step 3: Take out the reaction kettle, open it after cooling to normal temperature, adjust its pH value to 8-9 with 5% dilute sulfuric acid, then move it back to the high-pressure reaction kettle, and heat ...

Embodiment 1

[0034] Example 1 A method for preparing a shell-core structured molecular sieve catalyst for biomass pyrolysis reforming and upgrading

[0035] The preparation method of mesoporous composite molecular sieve among the present invention is as figure 1 shown, including the following steps:

[0036] Step 1. Add a certain amount of deionized water into the beaker, measure 40% TPAOH solution (mass ratio to water: 2.6:1) into deionized water, and then weigh HZSM-5 molecular sieve powder (mass ratio to TPAOH solution: 1 :5) Add it into the solution and stir quickly, place it on a magnetic stirrer and stir fully at 40°C. After 1 h, weigh the template agent CTAB (mass ratio to TPAOH solution: 1.6:1) and dissolve it to a 10% concentration solution, add it to the suspension, and stir thoroughly at 20°C for 1 h.

[0037]Step 2. After fully stirring the suspension in step 1, move it to a tetrafluoroethylene-lined autoclave, place the autoclave in an oven, and digest it for 24h at 110°C. ...

Embodiment 2

[0041] The composite molecular sieve prepared in Example 1 was used to carry out the catalytic pyrolysis test on algae, and the pyrolysis-gas chromatography / mass spectrometry (Py / GC-MS) reaction device was used to compare non-catalytic pyrolysis and HZSM-5 catalytic Product distribution of pyrolysis and MCM-41 / HZSM-5 composite molecular sieve catalyzed pyrolysis.

[0042] Spirulina was selected as biomass, passed through a 10-mesh sieve and dried for storage before the experiment. The inner diameter of the quartz tube used for the non-catalytic pyrolysis of spirulina is 1.9 mm, and the length is 25 mm. Use a balance to weigh 0.5 mg of spirulina with weighing paper and add it to the tube. Quartz wool is used on both sides to fix the spirulina, from left to right Followed by quartz wool, spirulina, quartz wool. When adding the catalyst, from left to right are quartz wool, catalyst, quartz wool, spirulina, quartz wool, catalyst, quartz wool. The catalytic pyrolysis temperature ...

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Abstract

The invention provides a preparation method of a shell-core structure molecular sieve for biomass pyrolysis oil production, which comprises the following steps of: adding deionized water into a beaker, measuring a TPAOH solution, adding the TPAOH solution into the deionized water, weighing HZSM-5 molecular sieve powder, adding the HZSM-5 molecular sieve powder into the solution, quickly stirring,sufficiently stirring for 1 hour, weighing a template agent CTAB, adding the template agent CTAB into a turbid liquid, sufficiently stirring, fully stirring the turbid liquid, transferring the turbidliquid into a high-pressure reaction kettle with a tetrafluoroethylene lining, placing the reaction kettle in a drying oven, digesting for 24 hours, taking out the reaction kettle, adjusting the pH value to 8.5, transferring the solution back into the high-pressure reaction kettle, crystallizing for 24 hours in the drying oven, filtering and washing the obtained solution containing the crystal grains, drying the filtered crystal grains in the drying oven, putting the dried molecular sieve into a muffle furnace, heating the muffle furnace to 550 DEG C at a heating rate of 10 DEG C/min, and roasting for 2-6 hours to remove the template agent, thereby obtaining the mesoporous-microporous composite molecular sieve with a core-shell structure.

Description

technical field [0001] The invention relates to a method for preparing a shell-core structure molecular sieve catalyst applied to biomass pyrolysis reforming and upgrading, which mainly utilizes the construction of mesoporous molecular sieves on the surface of microporous molecular sieves and realizes catalytic reforming by regulating the structure of mesoporous molecular sieves The invention relates to the selective pyrolysis of hydrocarbon organic matter, belonging to the technical field of biomass utilization. . Background technique [0002] Biomass energy, as a carrier of biomass, converts solar energy into chemical energy and stores it in biomass through photosynthesis, and has become the fourth largest energy source in the world after coal, oil, and natural gas. Biomass energy has the advantages of huge resources, clean and renewable, and has the potential to replace traditional fossil energy as the main energy source. [0003] Biomass rapid pyrolysis technology is t...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/02B01J37/10C10G1/00C10L1/04
CPCB01J29/005B01J35/026B01J37/10C10G1/00C10L1/04B01J29/0308B01J29/40
Inventor 仲兆平赵浩李昭莹
Owner SOUTHEAST UNIV
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