Ruthenium supported perovskite-type-oxide ammonia synthesis catalyst and preparation method thereof

A composite oxide and perovskite-type technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation/separation of ammonia, etc., can solve low-temperature and low-pressure activity of ruthenium catalysts, etc. problems, achieve excellent catalytic activity, no loss of raw materials, and simple preparation process

Inactive Publication Date: 2012-09-12
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of low-temperature, low-pressure and low-activity of ruthenium catalysts supported by ox...

Method used

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  • Ruthenium supported perovskite-type-oxide ammonia synthesis catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Zr(NO 3 ) 4 .5H 2 O:Ba(NO 3 ) 2 : A mixture of citric acid with a molar ratio of 1:1:2.0 was dissolved in a small amount of distilled water to obtain a colorless clear viscous liquid. The solution was slowly heated in a water bath at 80°C for 4 h to evaporate excess water, and then heated at a constant temperature of 90°C for 12 h to promote the gelation of the mixture. Finally, the obtained yellow gel was calcined at 300 °C for 1 h to obtain the precursor, and then calcined at 700 °C for 5 h to obtain BaZrO 3 carrier material. The active component ruthenium was impregnated into the carrier by equal volume impregnation method, and then reduced with absolute ethanol. The active component Ru accounted for 4% of the mass fraction of the carrier. The catalyst is 3 MPa, the space velocity is 10000 h -1 At 375°C, 400°C and 425°C, the outlet ammonia concentrations were 3.94%, 6.80% and 8.33%, respectively. Ammonia synthesis catalyst Ru / Al with 5wt% ruthenium content re...

Embodiment 2

[0021] BaZrO 3 The loading method of carrier and ruthenium is the same as embodiment 1, but the precursor of Zr is ZrO(NO 3 ) 2 . The outlet ammonia concentrations of the tested catalysts under the same conditions were 3.84%, 6.56% and 8.24%, respectively.

Embodiment 3

[0023] BaZrO 3 The loading method of carrier and ruthenium is the same as embodiment 1, but the precursor of Ba in the preparation process is Ba(CH 3 COO) 2 . The outlet ammonia concentrations of the tested catalysts under the same conditions were 3.72%, 5.94% and 7.86%, respectively.

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Abstract

The invention provides a ruthenium supported perovskite-type-oxide ammonia synthesis catalyst and a preparation method thereof, and belongs to the field of fertilizer catalysts. The ammonia synthesis catalyst comprises a perovskite-type BaZrO3 carrier and a ruthenium metal active ingredient, wherein the BaZrO3 carrier is prepared from barium salt and zircon salt by an organics complex-combustion method; and the ruthenium active ingredient takes K2RuO4 as a precursor, and the loading quantity is 2 to 10 percent of the weight of the carrier based on the weight of ruthenium (Ru); and the Ru is loaded on the BaZrO3 carrier by an isovolumetric impregnation method or a deposition precipitation method. The preparation method is simple and convenient, equipment is simple, and the prepared catalyst has the advantages of high low-temperature low-pressure activity, stable performance and the like, and has obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the field of fertilizer catalysts, and relates to a perovskite-type BaZrO with metal ruthenium as an active component 3 The invention relates to an ammonia synthesis catalyst with a carrier and a preparation method thereof, to be precise, it belongs to a noble metal catalyst and a preparation method thereof, and is applied to the synthesis of ammonia from a mixed gas of hydrogen and nitrogen. Background technique [0002] The ammonia synthesis industry is a typical extensive basic chemical industry with high energy consumption and low output, so energy saving and consumption reduction is an important direction for the development of the ammonia synthesis industry. Compared with traditional molten iron catalysts, ruthenium-based ammonia synthesis catalysts have the advantages of low temperature, low pressure and high activity, and are known as the second-generation ammonia synthesis catalysts after molten iron catalysts. Among ...

Claims

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Application Information

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IPC IPC(8): B01J23/58C01C1/04
CPCY02P20/52
Inventor 林建新王自庆王榕魏可镁
Owner FUZHOU UNIV
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