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Oxygen carrier, and preparation method and application thereof

An oxygen carrier and carrier technology, applied in the field of chemical chain hydrogen production, can solve the problems of limited oxygen carrying rate, low cyclic reactivity, high reaction temperature, etc. The effect of stability

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, the oxygen carrier NiO / NiAl 2 o 4 (CHO P etc. Fuel, 2004, 83(9)), Fe 2 o 3 / Al 2 o 3 (MATTISSON T etc. Fuel, 2001, 80 (13)) and CoO-NiO / YSZ (JIN H G etc. Energy Fuels, 1998, 12 (6)) have better overall performance, but there are limited oxygen loading rates and cyclic reactions low resistance, inability to withstand high reaction temperature, low dispersion of metal oxides in oxygen carriers, etc.

Method used

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  • Oxygen carrier, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 100ml of industrial water glass is treated with 100ml of 1.0M ammonium chloride and 0.5M hydrochloric acid mixture, and the part containing NH is removed by decantation. 4 + and Na + supernatant aqueous solution, the final pH = 10.0, prepared silica-rich sodium silicate hydrated gel (containing SiO 2 60wt%). NaAlO 2 , NaOH, silica gel, cetyltrimethylammonium bromide (CTAB, 98wt%), isomeric cetylamine (CA), tetraethylammonium hydroxide (TEAOH, 35wt%) and water according to Mix in a certain proportion, stir for 4 hours to form a gel, and the molar ratio of each substance in the gel system is Na 2 O:SiO 2 :Al 2 o 3 :CTAB:CA:TEAOH:H 2 O=1:3:0.08:0.8:0.1:0.15:150. The obtained gel was aged at room temperature for 16 hours to obtain a homogeneous gel (pH=11). The gel was heated in a Teflon-lined autoclave for 2 hours at 413K, followed by 100 hours at 443K. The synthesized product was filtered, washed and dried, and calcined at 613K for 3 hours, followed by 823K for...

Embodiment 2

[0021] With embodiment 1, the difference is that the gel system consists of Na 2 O:SiO 2 :Al 2 o 3 :CTAB:CA:TEAOH:H 2O=2:1:0.2:0.4:0.2:0.05:400. Weigh 30g of the carrier, according to the final cerium oxide content of the catalyst of 15%, weigh 25.8g of cerium nitrate and dissolve it in 34ml, add it to the above-mentioned modified carrier for impregnation, and adjust the pH value to 4 with nitric acid at the same time, aging for 2 hours, 80°C Dry for 6 hours and bake at 350°C for 4 hours. Based on the total content of cobalt oxide in the catalyst of 40wt%, 28g of cobalt nitrate was weighed and dissolved in 34ml, added to the above sample, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. The obtained oxygen carrier is denoted as C-2, and the evaluation results are shown in Table 1.

Embodiment 3

[0023] Same as Example 1, except that the pH value was adjusted to 5 during the preparation of the carrier, and the weight ratio of titanium dioxide and material A in the carrier was 1:10. Weigh 30g of the carrier, according to the final cerium oxide content of the catalyst of 10%, weigh 17.2g of cerium nitrate and dissolve it in 34ml, add it to the above-mentioned modified carrier for impregnation, and adjust the pH value to 5 with nitric acid at the same time, aging for 2 hours, 80°C Dry for 6 hours and bake at 350°C for 4 hours. Based on the total catalyst nickel oxide content of 30wt%, 20.99g of nickel nitrate was weighed and dissolved in 34ml, added to the above sample, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. The obtained oxygen carrier is denoted as C-3, and the evaluation results are shown in Table 1.

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Abstract

The invention discloses an oxygen carrier, and a preparation method and an application thereof. The preparation method comprises the following steps: 1, mixing NaAlO2, NaOH, silica gel, cetyltrimethylammonium bromide (CTAB), isohexadecylami (CA), tetraethylammonium hydroxide (TEAOH) and water according to a certain ratio to form gel, carrying out hydrothermal crystallization on the above obtained gel system, drying obtained crystals, and roasting the dried crystals to prepare a material A containing structural defects; 2, dispersing the material A prepared in step 1 in distilled water to prepare a suspension, adding titanium dioxide sol to the suspension, filtering the obtained material, drying the filtered material, and roasting the dried material to prepare a carrier; and 3, loading lanthanum and / or cerium and nickel and / or cobalt to the carrier prepared in step 2 in order to obtain the oxygen carrier. The oxygen carrier bears a high reaction temperature, and has the advantages of high dispersion of metal oxides in the oxygen carrier, high oxygen carrying rate, high oxygen cycle ability, high hydrogen production efficiency and good stability.

Description

technical field [0001] The invention relates to an oxygen carrier and its preparation method and application, in particular to an oxygen carrier for chemical chain cycle hydrogen production and its preparation method and application, belonging to the field of chemical chain hydrogen production. Background technique [0002] In 1983, German scientists Richter and Knoche first proposed the concept of chemical looping combustion (CLC). The biggest difference between this combustion technology and the usual combustion technology is that it does not directly use the oxygen molecules in the air, but uses the oxygen atoms in the oxygen carrier to complete the combustion process of the fuel, and the combustion products (mainly CO 2 and water vapor) will not be diluted by nitrogen in the air and the concentration is extremely high, and almost pure CO can be obtained by simple condensation 2 , simple and low energy consumption to achieve CO 2 In addition, due to the relatively low o...

Claims

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Application Information

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IPC IPC(8): B01J23/83C01B3/40C10L10/00
CPCY02P20/52
Inventor 倪向前张信伟梁浩尹泽群
Owner CHINA PETROLEUM & CHEM CORP
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