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Dehydrogenation catalyst applicable to raw gas rich in carbon monoxide, and preparation and application thereof

A dehydrogenation catalyst and carbon monoxide technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon monoxide, physical/chemical process catalyst, etc., can solve the problems of high energy consumption, inconvenient on-site operation, complicated post-treatment process, etc. , to achieve the effect of simple and convenient operation, low cost, and good driving and parking performance

Inactive Publication Date: 2013-03-20
DALIAN CATALYTIC ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst needs to be activated on-line in the device before it can be fed with raw material gas. It is necessary to build hydrogen supply facilities and high-temperature reduction equipment at the industrial site. The post-treatment process is complicated and energy-consuming, which brings inconvenience to on-site operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, dissolve 0.3 grams of palladium chloride with 10m hydrochloric acid (hydrochloric acid is a mixture of concentrated hydrochloric acid and deionized water at a volume ratio of 1:1, that is, hydrochloric acid made of concentrated hydrochloric acid and deionized water in the same volume) hydrochloric acid, and then add 4.6 grams of molybdic acid Ammonium, 2.5 grams of cerium nitrate and 2.5 grams of lanthanum nitrate were dissolved in water to prepare 70 grams of impregnating solution, 100 grams of alumina balls were poured into this solution for impregnation, dried and roasted at 600 ° C for 3 hours, at room temperature with 1% The hydrazine hydrate solution was reduced for 10 hours, and after the reduction, it was fully washed and dried to obtain the catalyst.

[0027] The composition of the direct feed of the catalyst is: 0.5% (volume percentage) H 2 , 0.5% O 2 , 0.5% CO 2 , 15% CO, the rest is N 2 Raw material gas, temperature 140°C, space velocity 2650h -1 ...

Embodiment 2

[0029] Dissolve 0.4 g of palladium chloride with 10m (1:1) hydrochloric acid, then add 5 g of ammonium paratungstate and 10 g of magnesium nitrate, dissolve in water to make 70 g of impregnating solution, pour 100 g of alumina ball into this solution for impregnation, After drying, roast at 500°C for 3 hours, reduce with 1% hydrazine hydrate solution at room temperature for 10 hours, wash thoroughly and then dry to obtain the catalyst.

[0030] The composition of the direct feed of the catalyst is: 6.2% H 2 , 3.6% O 2 , 0.5% CO 2 , 32% CO, the rest is N 2 Raw material gas, temperature 220℃, space velocity 2000h -1 , pressure 0.5MPa, at this time the outlet H 2 The content is 66ppm, the export O 2 The content is 300ppm.

Embodiment 3

[0032] First, dissolve 0.4 g of palladium nitrate with 10m (1:1) nitric acid, then add 0.45 g of silver nitrate, 3 g of zinc acetate and 2.5 g of praseodymium nitrate, dissolve in water to make 70 g of impregnation solution, pour 100 g of alumina balls into Soak in this solution, after drying, bake at 550°C for 3 hours, reduce with 1% hydrazine hydrate solution at room temperature for 10 hours, wash thoroughly and dry to obtain the catalyst.

[0033] The composition of the direct feed of the catalyst is: 0.3% H 2 , 0.3% O 2 , the rest is CO raw material gas, temperature 220 ℃, space velocity 1500h -1 , pressure 0.5MPa, at this time the outlet H 2 The content is 66ppm, the export O 2 The content is 550ppm.

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PUM

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Abstract

The invention relates to gas purification techniques and specifically to a dehydrogenation catalyst applicable to raw gas rich in carbon monoxide and preparation and application thereof. Palladium is used as an active component of the catalyst, auxiliary agents for the catalyst are two to four selected from the group consisting of silver, zinc, lanthanum, cerium, samarium, praseodymium, iron, stannum, manganese, calcium, magnesium, tungsten and molybdenum, and a carrier of the catalyst is alumina. The catalyst realizes selective catalytic oxidation removal of hydrogen in the raw gas rich in carbon monoxide by directing using synergism of palladium and oxides of a plurality of the auxiliary agents. Components of the catalyst comprise, based on the weight of the carrier, 0.05 to 1% of the active component and 0.5 to 5% of the total auxiliary agents. According to the invention, the catalyst has high activity and stability even when the application amount of a precious metal is small; through usage of the catalyst in a gas source rich in carbon monoxide, outlet hydrogen content is less than 100 ppm, outlet oxygen content is less than 0.1%, and purifying indexes of hydrogen and oxygen in reaction tail gas still accord with requirements after continuous operation for 1000 hours.

Description

technical field [0001] The invention relates to gas purification technology, in particular to a dehydrogenation catalyst suitable for raw material gas rich in carbon monoxide and its preparation and application. Background technique [0002] As we all know, precious metal palladium and platinum are common dehydrogenation catalysts in industry, which can be used for purification and dehydrogenation in non-reducing gases such as pure nitrogen, pure oxygen and carbon dioxide raw material gas in urea synthesis industry. However, in the purification and dehydrogenation process of carbon monoxide raw material gas, the concentration of carbon monoxide is three orders of magnitude higher than that of hydrogen. Conventional palladium or platinum / alumina catalysts are relatively close to the oxidation reaction selectivity of hydrogen and carbon monoxide. Most of the oxygen reacts with carbon monoxide instead of hydrogen, and the selective oxidation and removal of hydrogen cannot be ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/66B01J23/89B01J23/68C01B31/18C01B32/40
Inventor 刘振峰徐卫吴熠肖菲任宪平杜霞茹邱国文付桂芝吴迪镛
Owner DALIAN CATALYTIC ENG TECH
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