Application of three-dimensional ordered macro-porous perovskite type oxide in preparing hydrogen through carbonic fuel chemical chain

A perovskite-type, three-dimensional ordered technology, applied in inorganic chemistry, bulk chemical production, chemical instruments and methods, etc., can solve problems such as no reports, and achieve simple process, high reactivity, performance and service life improvement. Effect

Inactive Publication Date: 2012-06-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, domestic and foreign literatures and patents have not reported the preparation of three-dimensional ordered macroporous perovskite composite oxides as oxygen carriers for the chemical chain hydrogen production process of carbon-containing fuels.

Method used

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  • Application of three-dimensional ordered macro-porous perovskite type oxide in preparing hydrogen through carbonic fuel chemical chain
  • Application of three-dimensional ordered macro-porous perovskite type oxide in preparing hydrogen through carbonic fuel chemical chain
  • Application of three-dimensional ordered macro-porous perovskite type oxide in preparing hydrogen through carbonic fuel chemical chain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Preparation method of PS colloidal crystal template.

[0024] In the present embodiment, adopt the following method to prepare PS colloidal crystal mold: in house agitator, reflux condenser, thermometer and N 2 Add 1000ml of deionized water to the 2000ml four-neck flask of the trachea, pass N 2Vacuumize and heat to 70°C; slowly add 150ml of styrene purified by vacuum distillation into deionized water heated to 70°C; weigh 0.38g of potassium persulfate, dissolve it in 35ml of deionized water, and heat in a water bath to 70°C After injecting into the reaction solution at ℃, react at a stirring speed of 200r / min and under the protection of nitrogen for 24h; filter the obtained reaction solution to remove larger aggregates, then place it in a centrifuge tube and centrifuge at 1000r / min for 20h. The supernatant was discarded, and the tightly arranged colloidal crystal template was obtained, and the SEM picture of it is shown in figure 1 shown.

Embodiment 2

[0025] Example 2: Three-position ordered macroporous perovskite-type oxygen carrier LaFeO 3 preparation of

[0026] Three-dimensional ordered macroporous perovskite-type oxygen carrier LaFeO was prepared by the following method 3 : Weigh lanthanum nitrate and ferric nitrate at a molar ratio of 1:1 and dissolve them in 15ml of ethanol, control the metal ion concentration at about 1mol / L, stir at room temperature; add citric acid according to the molar ratio of the total metal salt to citric acid at 1:1 As a complexing agent, add an appropriate amount of ethylene glycol to adjust the viscosity of the solution, and stir for 2 hours to obtain LaFeO 3 precursor solution; 5g of the dried PS colloidal crystal template was pretreated at 110°C for 10min to improve the mechanical strength of the template and the connectivity of the pore structure, and then immersed in the precursor solution for 5h, the excess solution Remove by suction filtration, and the template is vacuum-dried; in ...

Embodiment 3

[0028] Example 3: Three-position ordered macroporous perovskite oxygen carrier EuFeO 3 preparation of

[0029] Weigh europium nitrate and ferric nitrate at a molar ratio of 1:1 and dissolve them in 15ml of ethanol, and control the metal ion concentration at about 1mol / L; add citric acid as a complexing agent according to the molar ratio of the total metal salt to citric acid at 1:1 , and then add an appropriate amount of ethylene glycol to adjust the viscosity of the solution; the dipping and roasting process is the same as in Example 2.

[0030] XRD results ( image 3 ) shows that the prepared EuFeO 3 It is a perovskite oxide, and its morphology was observed by scanning electron microscopy (SEM) ( Figure 5 ), with a three-dimensional ordered macroporous structure. The activity evaluation results for chemical looping hydrogen production from carbon-containing fuels are shown in Table 1.

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Abstract

The invention provides an application of a three-dimensional ordered macro-porous perovskite type oxide which is used as an oxygen carrier for preparing hydrogen through a carbonic fuel chemical chain. The three-dimensional ordered macro-porous perovskite type oxide has the characteristics of the perovskite type oxide and has a three-dimensional ordered macro-porous structure of an inverse opal structure. The three-dimensional ordered macro-porous perovskite type oxide is used as an oxygen carrier for preparing the hydrogen through the carbonic fuel chemical chain and has a general formula of ABO3, wherein A is rare-earth metal and B is transition metal. The three-dimensional ordered macro-porous structured perovskite structure has stable properties and longer service life; pore channels and specific surface area are bigger; during a contact process of the oxygen carrier and a carbonic fuel, much more lattice oxygen for participating in reaction can be supplied; the contact of the oxygen carrier and the carbonic fuel can be boosted; the specific surface area of the oxygen carrier can be increased by abundant pore channels; catalytic conversion between small particles and gas molecules is boosted; the three-dimensional ordered macro-porous perovskite type oxide has higher reaction activity in chemical chain combustion and steam pyrolytic decomposition; and compared with the conventional metal oxygen carrier, the three-dimensional ordered macro-porous perovskite type oxide has higher reaction activity and hydrogen yield.

Description

technical field [0001] The invention relates to the technical field of functional material synthesis and energy utilization, in particular to the use of three-dimensional ordered macroporous perovskite oxides as an oxygen carrier for carbon-containing fuel chemical chain hydrogen production. technical background [0002] In the near future, hydrogen energy will become the main way for human beings to utilize energy, and human beings will establish an energy utilization economic model with hydrogen energy as the mainstay. The advantages of hydrogen as a fuel are very obvious. Hydrogen is produced from coal, petroleum, natural gas and biomass, etc., and the product is generally H 2 , CO and CO 2 A mixture of gases such as H 2 , while the separation and purification process is expensive and complicated. Chemical looping gasification hydrogen production technology uses lattice oxygen in oxygen carrier to oxidize raw materials to CO 2 and H 2 O, without the participation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/16C01B3/38
CPCY02P20/52
Inventor 赵坤何方黄振李新爱李海滨赵增立
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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