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Supported spinel compound and preparation and application thereof

A spinel and compound technology, applied in the field of supported spinel compounds and their preparation and application, can solve the problems of high metal oxide reduction temperature, poor cycle performance, and less oxygen vacancies, and achieve sustainable reaction Effect

Active Publication Date: 2014-06-18
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] It is not difficult to find from the existing reports that the two-step thermochemical cycle decomposition of H 2 O / CO 2 The work is still in the primary basic research stage, and the main problems of the existing active materials are: (1) high reduction temperature of metal oxides; (2) less oxygen vacancies that can be recycled; (3) cycle poor performance

Method used

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  • Supported spinel compound and preparation and application thereof
  • Supported spinel compound and preparation and application thereof
  • Supported spinel compound and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of NiFe by Sol-Gel Self-propagating Combustion Method 2 o 4 / SiO 2 : Weigh 2.91g cobalt nitrate Ni (NO 3 ) 2 ·6H 2 O(10mmol), 8.08g Fe(NO 3 ) 3 9H 2 O (20mmol), 9.46g of citric acid (45mmol) were dissolved in 50ml of deionized water, and 19.1mL of silica sol (30%) was added, stirred at room temperature for 30min, placed in a water bath at 80°C until evaporated to dryness, and then Dry in an oven at 120°C until a xerogel is formed. Then, the obtained xerogel was ignited in a muffle furnace at 600 °C and fully burned, and the obtained product was calcined at 700 °C for 4 h to prepare NiFe with a loading capacity of 25%. 2 o 4 / SiO 2 sample.

Embodiment 2

[0048] a: Preparation of Ni by combustion method by sol-gel self-propagating combustion method 0.5 Cu 0.5 Fe 2 o 4 : Weigh 2.91g cobalt nitrate Ni (NO 3 ) 2 ·6H 2 O (10mmol), 2.42g copper nitrate Cu (NO 3 ) 2 ·3H 2 O(10mmol), 16.16g Fe(NO 3 ) 3 9H 2 O (40mmol), 12.60g of citric acid (60mmol) were dissolved in 60ml of deionized water, stirred at room temperature for 30min, placed in an oil bath at 90°C until evaporated to dryness, and dried in an oven at 120°C until dry condensation was formed. glue. Then, the obtained xerogel was ignited in a muffle furnace at 700°C and fully burned, and the obtained product was calcined at 800°C for 3 hours to obtain Ni 0.5 Cu 0.5 Fe2 o 4 .

[0049] b: Mechanical mixing load: Weigh a certain mass of inert high temperature resistant oxide carrier SiO 2 and spinel material Ni 0.5 Cu 0.5 Fe 2 o 4 , so that Ni 0.5 Cu 0.5 Fe 2 o 4 The loading amount of Ni is 30%, ball milled for 8h after mixing evenly, and roasted at 900°C ...

Embodiment 3

[0051] Weigh 0.400g 25wt%NiFe 2 o 4 / SiO 2 The sample is placed in the reaction tube, the deoxidation temperature is selected as 1400°C, after a period of constant temperature treatment, the temperature is lowered, and CO 2 , the reaction temperature is selected at 1100-1200° C., and the reaction is completed in 2 hours. o 2 Yield and CO production are listed in Table 1.

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Abstract

The invention relates to a method for producing CO with an inert oxide carrier (SiO2, Al2O3, ZrO2, TiO2, YSZ and the like) supported spinel compound A<1-gamma>B<2-delta>O<4> (0<=gamma<1, 0<=delta<=1) as an active material and through two steps of thermochemical cyclic decomposition of CO2. The method comprises the following main steps: (1) firstly, the active material releases oxygen at a high temperature so as to generate oxygen vacancies; and (2) the active material containing a large number of oxygen vacancies is subjected to a reaction with CO2 at a lower temperature, and CO is released. Spinel is used as the active material for undergoing the decomposition reaction of CO2 for the first time; and compared with other active materials, the spinel active material has large oxygen releasing quantity (with the quantity of 7.4-30.6 ml / g at the temperature of 1400 DEG C), and can generate considerable quantity of CO (with the quantity of 10.8-58.6 ml / g). The active material can utilize solar energy focus generated high-temperature heat as an energy source, CO2 is taken as the reaction raw material, and CO is produced; and the method is clean and pollution-free, and is expected to become an effective technology for preparing chemical fuel through reduction of CO2 by solar energy.

Description

technical field [0001] The present invention involves a two-step thermochemical cycle for the decomposition of CO 2 , more specifically related to the inert refractory oxide support (SiO 2 、Al 2 o 3 , ZrO 2 、TiO 2 , YSZ, etc.) loaded spinel compound A 1-γ B 2-δ o 4 (0≤γ<1, 0≤δ≤1) as an active material to decompose CO 2 , to prepare CO, this kind of material can produce a considerable amount of CO at a lower temperature, and has a very broad application prospect in energy saving and emission reduction. Background technique [0002] Due to the unsustainability of fossil energy, as well as the greenhouse effect and environmental pollution caused by the use of fossil energy, the research and utilization of clean and environmentally friendly renewable energy systems are imminent. my country is CO 2 Large emitters, CO 2 Emissions show a trend of rapid growth and are under increasing pressure from the international community. Solar energy has the advantages of being ...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/78B01J23/83B01J23/89C01B31/18C01B13/02C01B32/40
CPCY02P20/133
Inventor 李灿童金辉蒋宗轩蒋青青陈真盘
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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