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Catalytic nitrogen carrier suitable for coal chemical looping ammonia production and preparation method thereof

A catalytic carrier, chemical chain technology, applied in chemical instruments and methods, ammonia preparation/separation, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, low conversion efficiency, low single-pass conversion rate, etc. High gas conversion rate, uniform distribution and good fluidization characteristics

Pending Publication Date: 2020-01-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this reaction conversion efficiency is low, and energy consumption is very big, and this reaction is subjected to the restriction of thermodynamic equilibrium, and the single-pass conversion rate at high temperature is low, only only has 15%~20% (J.R.Bartels, Dissertations&Theses-Gradworks, 2008; Y. Wu, et al, ChemCommun, 53 (2017) 10664-10667)

Method used

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  • Catalytic nitrogen carrier suitable for coal chemical looping ammonia production and preparation method thereof
  • Catalytic nitrogen carrier suitable for coal chemical looping ammonia production and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 2kg of γ-alumina, 0.3kg of calcium fluoride, and 7.7kg of titanium oxide, add 100l of water, place them on a stirrer for stirring, and heat at 70°C. After 2h, put the suspension into In a muffle furnace, heat it to 500°C, pass argon gas for calcination, calcinate at a constant temperature for 12 hours, take it out, and finally put the bulk sample into a mortar and fully grind it to obtain a powdery sample, and finally sieve the sample and keep 3 ~4 μm samples.

[0031] The performance test of nitrogen absorption reaction and nitrogen release reaction was carried out on the catalytic nitrogen carrier prepared in Example 1. like figure 1 As shown, the reaction temperature was from 1200 to 1500° C., the flow rate of nitrogen was 200 ml / min, the mass of γ-alumina was 0.5 g, and the mass of coke was 0.16 g. Compared with the catalytic nitrogen carrier prepared without adding calcium fluoride, the catalytic nitrogen carrier prepared in Example 1 has a significantly hi...

Embodiment 2

[0034] Weigh 2kg of γ-alumina, 0.3kg of yttrium oxide, and 7.7kg of titanium oxide, add 100 l of water, place them on a stirrer for stirring, and heat at 70 °C, and put the suspension into a horse after 2 hours. In a Furnace, heated to 500°C, calcined with argon gas, calcined at a constant temperature for 12 hours, taken out, and finally put the bulk sample into a mortar and fully ground to obtain a powdery sample, and finally sieved the sample and retained 3~ 4 μm samples.

[0035] During the nitrogen release reaction, the conversion rate of ammonia gas increases with the mass proportion of the titanium oxide carrier. When the mass content of titanium oxide accounts for 80%, the conversion rate of ammonia gas can reach 60%.

Embodiment 3

[0037] Weigh 3kg of γ-alumina, 0.3kg of calcium fluoride, 6.7kg of titanium oxide, add 100l of water, place it on a stirrer for stirring, and heat at 70°C, after 2h, put the suspension into In a muffle furnace, heat it to 500°C, pass argon gas for calcination, calcinate at a constant temperature for 12 hours, take it out, and finally put the bulk sample into a mortar and fully grind it to obtain a powdery sample, and finally sieve the sample and keep 3 ~4 μm samples.

[0038] In the process of nitrogen release reaction, the conversion rate of ammonia gas increases with the increase of the mass proportion of titanium oxide carrier. When the mass content of titanium oxide accounts for 70%, the conversion rate of ammonia gas can reach 56%.

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Abstract

The invention discloses a catalytic nitrogen carrier suitable for a coal chemical-looping ammonia production process and a preparation method thereof; wherein the catalytic nitrogen carrier comprisesthe following components in percentage by mass: 20-30% of aluminum-based nitrogen carrier gamma-aluminum oxide, 3% of a nitrogen absorption reaction catalyst and 67-77% of a nitrogen release reactioncatalytic carrier titanium oxide. The catalytic nitrogen carrier can be prepared by a mechanical mixing method or an excessive impregnation method. The nitrogen absorption temperature of the catalyticnitrogen carrier is 800-1000 DEG C, the nitrogen release temperature is 1200-1500 DEG C, the nitrogen migration capacity is high, the cycling stability is good, the ammonia gas yield is high, and theconversion rate can reach 60% within 60-70 min.

Description

technical field [0001] The invention belongs to the technical field of catalytic nitrogen carriers, and relates to a catalytic nitrogen carrier suitable for the process of coal chemical chain ammonia production and a preparation method thereof. Background technique [0002] In recent years, ammonia, as a clean and efficient combustible gas, has become one of the key research objects of many scholars. Compared to hydrogen, ammonia has a higher calorific value and the products are clean steam and nitrogen. In addition, ammonia is easier to liquefy, and its storage and transportation costs are greatly reduced. Therefore, ammonia, as the second-generation clean energy, has been vigorously developed in its synthesis technology. [0003] At present, about 90% of industrial ammonia is obtained by the Harbo method, that is, nitrogen and hydrogen are synthesized under the action of high temperature and high pressure and catalyst. However, the conversion efficiency of this reaction...

Claims

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Application Information

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IPC IPC(8): B01J27/12B01J23/10C01C1/02
CPCB01J27/12B01J23/10B01J23/002C01C1/02B01J2523/00B01J35/399B01J2523/31B01J2523/36B01J2523/47Y02P20/52
Inventor 吴烨张权刘岩高原刘冬
Owner NANJING UNIV OF SCI & TECH
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