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Monolithic catalyst for use in preparation of chloride by using hydrogen chloride and preparation method thereof

A monolithic catalyst, hydrogen chloride technology, applied in the direction of chloride preparation, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low catalyst activity, and achieve a simple and high-efficiency synthesis method Conversion rate, solve the effect of low activity

Inactive Publication Date: 2010-10-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst well solves the current problems of ruthenium-based catalysts in the hydrogen chloride catalytic oxidation reaction, such as low catalyst activity and local hot spots in the reactor.

Method used

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  • Monolithic catalyst for use in preparation of chloride by using hydrogen chloride and preparation method thereof
  • Monolithic catalyst for use in preparation of chloride by using hydrogen chloride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 12.4g RuCl 3 ·3H 2 O was dissolved in 96ml of ethylene glycol, slowly heated to 140°C, and 220ml of 1mol L was added dropwise -1 K 2 CO 3 The aqueous solution was stirred with nitrogen for 5h, transferred to an autoclave at 100°C, crystallized for 10h, filtered, dried, and calcined at 260°C to obtain about 7.7g RuO 2 ·3H 2 O(110), wherein the (110) crystal plane accounts for 40%;

[0032] (2) 7.7g RuO 2 ·3H 2 O(110) was loaded onto 5.4 g of SBA-15 by wet impregnation, washed with ethanol, and dried to form 10% RuO 2 (110) / SBA-15, the RuO 2 (110) / SBA-15 is ground into powder, adding γ-Al 2 o 3 Sol (containing γ-Al 2 o 3 about 6g) and 10ml 1mol L -1 HNO 3 , with magnetic stirring for 5 hours, RuO 2 (110) content is the active slurry of 5wt%;

[0033] (3) Grind the FeCrAl alloy with sandpaper to increase the surface roughness, and put it in 1mol L -1 Ultrasonic washing in NaOH solution for 30 minutes to remove surface impurities and oil stains, washin...

Embodiment 2

[0038] The ethylene glycol in the embodiment 1 step (1) is changed into the 20% arginine solution of 300ml, K 2 CO 3 Change to NaOH, change the temperature into the autoclave to 140°C, change the crystallization time to 12h, change the roasting temperature to 320°C, and replace SBA-15 with rutile TiO in step (2). 2 , the calcination temperature in step (4) was changed to 450°C, the calcination temperature in step (5) was changed to 600°C, and other conditions remained unchanged, RuO 2 (110) / TiO 2 / FeCrAl, in which (110) crystal plane accounts for 49%. Under the same conditions, the conversion rate of hydrogen chloride was 94.2%. Example 3:

Embodiment 3

[0039] The ethylene glycol in embodiment 1 step (1) is changed into 20wt% cetyl trimethyl ammonium bromide solution (ethylene glycol is identical with the molar weight of cetyl trimethyl ammonium bromide), K 2 CO 3 Change to potassium hydroxide, change the temperature of the autoclave to 60°C, change the roasting temperature to 220°C, replace SBA-15 with MCM-41 in step (2), and change the temperature of cordierite at 1mol L -1 HNO 3 Soak in water for 30min, take out, wash and dry. In step (4), FeCrAl is replaced by cordierite, the roasting temperature is changed to 450°C, the roasting temperature in step (5) is changed to 600°C, and other conditions remain unchanged, and RuO 2 (110) / MCM-41 / cordierite, in which the (110) crystal plane accounts for 39%. The conversion rate of hydrogen chloride was 84.9% under the same conditions.

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Abstract

The invention discloses a monolithic catalyst for use in the preparation of chloride by using hydrogen chloride, which belongs to the field of catalyst preparation. The catalyst is expressed as RuO2(110) / carrier / FeCrAl or RuO2(110) / carrier / cordierite, and is formed by a FeCrAl alloy or cordierite, a carrier loaded on the FeCrA or cordierite and an active ingredient RuO2(110) loaded on the carrier, wherein the active ingredient RuO2(110) accounts for 1 to 1.3 weight percent of the whole catalyst, the carrier accounts for 7 to 12 weight percent of the whole catalyst and the carrier is SBA-15, MCM-41, rutile TiO2, alpha-Al2O3 or silicon aluminum molecular sieve. The invention also discloses a method for preparing the monolithic catalyst. The synthesis method of the monolithic catalyst is simple, has high activity for the reaction for preparing the chloride by using the hydrogen chloride and can realize a high conversion rate of hydrogen chloride at a lower temperature.

Description

technical field [0001] The present invention relates to a kind of RuO used for producing chlorine from hydrogen chloride 2 A method for preparing monolithic catalysts with dominant (110) facets. Background technique [0002] As a very important chemical product and raw material, chlorine gas is widely used in metallurgy, papermaking, textile, medicine and petrochemical industries. In most chlorination reactions, the chlorine substitution reaction occupies the main position. Every time a chlorine atom replaces a hydrogen atom, another chlorine atom combines with a hydrogen atom to form a hydrogen chloride co-product, which results in a low utilization rate of the chlorine atom. (often less than 50%). Hydrogen chloride gas produced in industry is usually made into cheap hydrochloric acid by water absorption method for sale or discharged after neutralization with alkali, which not only affects the economic benefits of chlorine product production, but also causes serious envir...

Claims

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Application Information

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IPC IPC(8): B01J29/78B01J29/74B01J23/89B01J23/46B01J37/00C01B7/04
Inventor 吴玉龙芮果杨明德党杰史雪君胡湖生陈镇刘吉陈宇
Owner TSINGHUA UNIV