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Biomass coke tar catalyst with mayenite loaded with calcium and iron compounds as well as preparation and application

A mayenite and catalyst technology, applied in the field of biomass tar catalysts, can solve the problems of high price, deactivation, difficult synthesis gas, etc., and achieve the effects of uniform distribution of active components, improved strength, and reduced carbon deposition.

Inactive Publication Date: 2017-06-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Ni-based metal catalysts are the most widely used biomass tar catalysts, but Ni-based metal catalysts are prone to carbon deposition and H 2 S poisoning leads to inactivation, and has certain environmental toxicity, and the price is relatively expensive
In addition, although the commonly used catalysts can decompose biomass tar, they cannot obtain high-concentration H 2 It is difficult to directly apply syngas to advanced and efficient fuel utilization devices such as hydrogen fuel cells and hydrogen turbines.

Method used

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  • Biomass coke tar catalyst with mayenite loaded with calcium and iron compounds as well as preparation and application
  • Biomass coke tar catalyst with mayenite loaded with calcium and iron compounds as well as preparation and application
  • Biomass coke tar catalyst with mayenite loaded with calcium and iron compounds as well as preparation and application

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preparation example Construction

[0031] A mayenite (Ca 12 Al 14 o 33 ) simultaneously load calcium and iron compound novel tar catalyst and its sol-gel method preparation method thereof, comprising the following steps:

[0032] (1) CaO pretreatment. A certain amount of calcium precursor is placed in a muffle furnace and calcined at 500-1000° C. for 2-10 hours. During the high-temperature calcination, the calcium precursor undergoes a decomposition reaction and CaO is obtained. Grinding and sealing the obtained CaO;

[0033] (2) Loading iron active components. The pretreated CaO and a certain stoichiometric ratio of iron precursors were respectively dissolved in excess organic acid solution to obtain a sol. Stir the sol at 110°C to 150°C for 1 to 24 hours to obtain a gel. Then the gel is heated at 100° C. to 200° C. for a certain period of time to obtain a dry gel. Then calcining the xerogel at 500°C-1000°C for 2-10 hours, calcining and decomposing the iron precursor therein into active iron catalytic c...

Embodiment 1

[0036] figure 1 A schematic diagram of the specific process and method for the preparation of the new catalyst, specifically including the following steps:

[0037] Step 1: Preparation of CaO

[0038] A certain amount of Ca(CH 3 COO) 2 ·H 2 O powder was calcined at 850 °C for 2 h. Ca(CH 3 COO) 2 ·H 2 O undergoes decomposition reaction (1) at high temperature to generate CaO solid. Grind the obtained CaO into powder and keep it sealed.

[0039] Ca(CH 3 COO) 2 ·H 2 O=CaO+CO 2 +CH 3 COCH 3 +H 2 O (1)

[0040] The second step: loading iron active components.

[0041] Take 2gCaO and 1.443g Fe(NO 3 ) 3 9H 2 O, so that the weight ratio of Fe atoms to CaO is 1:10. Combining CaO with Fe(NO 3 ) 3 9H 2 O was mixed and dissolved in 393.7ml of propionic acid to obtain a brown-red sol; the beaker containing the sol was placed on an electromagnetic heating stirrer, and stirred at a speed of 250r / min at 120°C for 2h 45min to obtain a brown sol gel; then the gel was dr...

Embodiment 2

[0048] In order to verify the strength of the catalyst, a test of the cracking strength of the catalyst was carried out. The test method is as follows: place 4 catalyst spherical particles at the four corners of a 4cm×4cm square respectively, place a flat and solid circular wooden board on top of the particles, and keep the wooden board coincident with the center of the square. Gradually add weights on the wooden board until the gravity of the weights simultaneously crushes the four spherical catalysts. The gravity of the weight divided by the area of ​​the square is the fracturing strength of the catalyst particle. For newly prepared carbonation and calcination cycle reactions (carbonation reaction temperature: 720°C, time 50min; calcination reaction temperature: 850°C, time 10min; reaction atmosphere: 15%CO 2 +85%N 2 ) spherical catalysts were tested for their fracture strength. The strength of the fresh catalyst is 65KPa, and the strength of the catalyst after the multi-...

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Abstract

The invention relates to a biomass coke tar catalyst with mayenite loaded with calcium and iron compounds as well as a preparation method and an application of the biomass coke tar catalyst. The catalyst takes the mayenite (Ca12Al14O33) as a carrier and is also loaded with the calcium and iron compounds at the same time; and main chemical components comprise CaO, the mayenite and iron compounds with coke tar catalyzing activity. Compared with a traditional biomass coke tar catalyst, the novel catalyst provided by the invention has the following beneficial effects that (1) compared with a Ni-based catalyst, an iron active component of the coke tar catalyst has the advantages of environmental friendliness and low price; (2) the catalyst contains the CaO and biomass gasified synthetic gas with high-concentration H2 is easy to prepare; (3) the Ca12Al14O33 carrier can be used for easily reducing deposited carbon of the catalyst, the strength of the catalyst can be improved and the activity of absorbing CO2 can be improved; and (4) the catalyst is prepared by adopting a sol-gel method and various active components of the catalyst are uniformly distributed.

Description

[0001] (1) Technical field [0002] The invention relates to a biomass tar catalyst with calcium-iron compound loaded on mayenite, a preparation method and application thereof. [0003] (2) Background technology [0004] Biomass energy is a renewable energy with abundant reserves, wide sources, low S, N pollutants and CO 2 Advantages such as net zero emissions, its essence is stored solar energy. According to the estimates of the World Wide Fund for Nature, the potential utilization of biomass energy in the world reaches 350EJ / year (about 8.212 billion tons of standard oil). According to the statistics of my country's "Medium and Long-term Development Plan for Renewable Energy", the potential of my country's biomass resources to be converted into energy is about 500 million tons of standard coal. The potential can reach 1 billion tons of standard coal. The full and reasonable utilization of biomass energy is of great significance to solve the exhaustion of fossil energy and p...

Claims

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Application Information

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IPC IPC(8): B01J23/78C10K1/34
CPCB01J23/002B01J23/78B01J2523/00C10K1/34B01J2523/23B01J2523/31B01J2523/842
Inventor 韩龙林康张媛钟英杰任建莉徐璋张浩
Owner ZHEJIANG UNIV OF TECH
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