Preparation of catalyst with carrier of ceria-zirconia solid solution and application of catalyst in NOx removal

A cerium-zirconium solid solution and catalyst technology, applied in the selective catalytic oxidation of NO, the preparation of supported transition metal chromium, and the field of catalyst preparation, can solve the problems of complicated methods and complicated preparation methods, and achieve simplified preparation conditions and simplified The effect of the preparation step, promoting the probability of being oxidized

Active Publication Date: 2012-10-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

F. Ocampo et al. (F. Ocampo, B Louis, A Kiennemann, et al. CO2 methanolation over Ni-Ceria-Zirconia catalysts: effect of preparation and operating conditions [J]. Materials Science and Engineering , 2011, 19: 1-11) studied the methanation of CO2 using cerium-zirconium solid solution as a carrier, and prepared cerium-zirconium solid solution by pseudo-sol-gel method, the preparation method is relatively complicated
Zhong Wang et al. (Zhong Wang, Zhenping Qu, Xie Quan, et al. Selective catalytic oxidation of ammonia to nitrogen over ceria-zirconia mixed oxides [J]. Applied Catalysis A: General, 2012, 411-412: 131-138) to The catalytic oxidation of ammonia (NH3) was studied using cerium-zirconium solid solution as a carrier, but cetyltrimethylammonium bromide (CTAB) w

Method used

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  • Preparation of catalyst with carrier of ceria-zirconia solid solution and application of catalyst in NOx removal
  • Preparation of catalyst with carrier of ceria-zirconia solid solution and application of catalyst in NOx removal

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Embodiment 1

[0026] The catalyst for catalytic oxidation of NO prepared according to the present invention, wherein the Ce / Zr mass ratio of the cerium-zirconium solid solution carrier is 0.25:1, and the loading amount of the main active component chromium is 7% (mass fraction).

[0027] (1) Preparation of cerium-zirconium solid solution carrier by hydration method:

[0028] Dissolve cerium nitrate and zirconium oxychloride (according to the above ratio) in deionized water, stir for 2 hours, reflux in a water bath at 60°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 500°C in air for 6 Hour;

[0029] (2) Loading active component chromium to cerium-zirconium solid solution carrier by impregnation method:

[0030] Dissolve chromium nitrate and cerium-zirconium solid solution carrier in deionized water according to the above ratio, stir for 2 hours, reflux in a water bath at 60°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 400°C in...

Embodiment 2

[0032] The catalyst for catalytic oxidation of NO produced according to the present invention, wherein the Ce / Zr of the cerium-zirconium solid solution carrier is 4:1 (mass ratio), and the loading amount of the main active component chromium is 10% (mass fraction).

[0033] (1) Preparation of cerium-zirconium solid solution carrier by hydration method:

[0034] Dissolve cerium nitrate and zirconium oxychloride (according to the above ratio) in deionized water, stir for 2 hours, reflux in a water bath at 60°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 500°C in air for 6 Hour;

[0035] (2) Loading active component chromium to cerium-zirconium solid solution carrier by impregnation method:

[0036] Dissolve chromium nitrate and cerium-zirconium solid solution carrier in deionized water according to the above ratio, stir for 2 hours, reflux in a water bath at 60°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 500°C in...

Embodiment 3

[0038] The catalyst for catalytic oxidation of NO prepared according to the present invention, wherein the Ce / Zr of the cerium-zirconium solid solution carrier is 1:1 (mass ratio), and the loading amount of the main active component chromium is 10% (mass fraction).

[0039] (1) Preparation of cerium-zirconium solid solution carrier by hydration method:

[0040] Dissolve cerium nitrate and zirconium oxychloride (according to the above ratio) in deionized water, stir for 2 hours, reflux in a water bath at 80°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 500°C in air for 6 Hour;

[0041] (2) Loading active component chromium to cerium-zirconium solid solution carrier by impregnation method:

[0042] Dissolve chromium nitrate and cerium-zirconium solid solution carrier in deionized water according to the above ratio, stir for 2 hours, reflux in a water bath at 60°C for 4 hours, dry in an oven at 120°C for 12 hours, and finally calcinate at 500°C in...

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Abstract

The invention relates to a preparation method of a catalyst i.e., supported transition metal chrome with a carrier of a ceria-zirconia solid solution, and application of the catalyst in selectively catalytic oxidizing NO in flue gases. The preparation method of the catalyst comprises the following steps: 1, that cerium nitrate and zirconium oxychloride are dissolved in deionized water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the carrier of the ceria-zirconia solid solution; and 2, that chromic nitrate and the ceria-zirconia solid solution are dissolved in water and stirred, and are dried and calcinated after fully reaction, thereby obtaining the catalyst Cr/CexZr1-xO2. The catalyst prepared in the invention increases superoxide radicals to the carrier which is used for catalytic oxidizing NO, thereby assisting migration and diffusion of bulk phase oxygen, and facilitating the NO to be oxidized on carrier surface. Thus, the catalyst has good capability of catalytic oxidizing NO.

Description

technical field [0001] The invention relates to a catalyst preparation method and its application, in particular to a preparation method of transition metal chromium supported by cerium-zirconium solid solution and its application in selective catalytic oxidation of NO in flue gas, which belongs to inorganic chemical field. [0002] Background technique [0003] At present, my country's energy consumption is increasing rapidly, and the number of motor vehicles is increasing year by year. NO x Emissions continue to rise, and the type of acid rain has changed from sulfuric acid to compound sulfuric acid and nitric acid. With SO 2 Removal technology is becoming more and more mature, NO x Removal has become a hot research topic. [0004] So far applied to NO x Various methods of removal include: Selective Catalytic Reduction (SCR), Continuous Regeneration Replenishment (CRT), NO x Storage and reduction (NSR) and wet denitrification, etc., these methods have in common that...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J37/02B01D53/86B01D53/56
CPCY02C20/10
Inventor 钟秦蔡炜张舒乐徐亚琳
Owner NANJING UNIV OF SCI & TECH
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