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A kind of rare earth nanocomposite catalyst and its preparation method and application

A nanocomposite and catalyst technology, applied in the direction of catalyst activation/preparation, preparation with chloride, chemical instruments and methods, etc., can solve the problems of expensive catalyst preparation, reduced industrial application value, loss of active components, etc., to avoid sintering Effect of inactivation phenomenon, improvement of utilization rate and responsiveness, and increase of contact area

Active Publication Date: 2012-02-01
NANJING RESOURCES & ENVIRONMENT ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent US5716592 reported the use of chromium oxide and rare earth cerium composite catalyst, but due to the high toxicity of chromium, and chromium and chlorine are very easy to form low-boiling chromium oxychloride, which is easy to cause the loss of active components and deactivate the catalyst, so Reduced its industrial application value
Patent WO2008131857 suggests using ruthenium chloride as a catalyst, but the preparation of the catalyst is expensive
Patents CA823197 and CA920775 respectively use mordenite or molecular sieve as the carrier, and the ion exchange method is used to prepare the catalyst. The process is relatively complicated, and the conversion rate of the obtained hydrogen chloride oxidation reaction is only 52.8% and 69%, and the reaction temperature is too high, which is easy to cause active components loss of

Method used

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  • A kind of rare earth nanocomposite catalyst and its preparation method and application
  • A kind of rare earth nanocomposite catalyst and its preparation method and application
  • A kind of rare earth nanocomposite catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation and Application of Unloaded Particulate Rare Earth Nanocomposite Catalysts

[0038] 17.5g (0.04mol) Ce(NO 3 ) 3 .6H 2 O, 13.5g (0.08mol) CuCl 2 .2H 2 O. 5.5g (0.07mol) of KCl was added to 490g (27mol) of deionized water, fully dissolved, then 61g (0.32mol) of citric acid was added, and vigorously stirred for 12h to obtain solution A. After preparing solution A, stir vigorously in a constant temperature water bath at 60°C until a gel is formed, put the gel into an oven at 120°C to foam for 12 hours, and then bake it at 450°C for 4-6 hours to obtain unsupported particles Type rare earth nanocomposite catalyst powder, that is, hydrogen chloride oxidation catalyst type I. Its XRD spectrum is shown in figure 1 .

[0039] In a 60mL three-phase slurry reactor, 8g of the above-mentioned catalyst type I are loaded, and the reaction medium is composed of 54g of inert molten salt composed of zinc chloride, potassium chloride and sodium chloride, and t...

Embodiment 2

[0040] Example 2: Preparation and Application of Supported Rare Earth Nanocomposite Catalysts

[0041] The catalyst preparation method described in Example 1 was adopted, except that after the solution A was obtained, 50 g of ReY molecular sieve carriers with a particle size of 110 mesh were added, and stirring was continued in a constant temperature water bath at 60° C. until a dense gel was formed. Put the gel in an oven at 120°C for 12 hours, and then bake it at 450°C for 4 hours to obtain a supported rare earth nano-catalyst powder; mix the nano-catalyst powder with 20 g of silica sol; extrude it with an extruder , cut into lengths of 1-3 mm, dried in an oven at 120°C for 12 hours, and then calcined in a muffle furnace at 450°C for 4 hours to obtain a supported rare earth nanocomposite catalyst, that is, hydrogen chloride oxidation catalyst type II. The circumferential crushing strength of the catalyst is 76.6N / cm, and the particle diameter of the supported active componen...

Embodiment 3

[0043] Example 3: Preparation and Application of Supported Rare Earth Nanocomposite Catalysts

[0044] Using the catalyst preparation method described in Example 2, the difference is that the carrier is replaced by silica to prepare a supported rare earth nanocomposite catalyst. 8 g of the above-mentioned catalysts were loaded into the fixed-bed reactor, and the conversion rate of hydrogen chloride was 84.3% under the condition that the volume flow ratio of hydrogen chloride to oxygen was 1.5:1 at normal pressure of 360°C.

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Abstract

The invention belongs to the field of catalysts, and discloses a rare earth nanocomposite catalyst, a preparation method and application thereof. The catalyst is a rare earth nanocomposite catalyst with a nanocomposite composed of a compound containing cerium element, a compound containing copper element and a compound containing potassium element as the catalytic active component. In the invention, the catalytic activity of the catalyst is made into nano-scale particles, the activity of the catalyst is obviously improved, and the reaction efficiency and the utilization rate of the catalyst are improved.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a rare earth nanocomposite catalyst and its preparation method and application, in particular to a rare earth nanocomposite catalyst containing cerium, copper and potassium and its preparation method and its preparation method in the catalytic oxidation of hydrogen chloride. Chlorine application. Background technique [0002] Chlorine is one of the main products in the chlor-alkali industry, and it is widely used in the fields of chemistry, metallurgy, papermaking, textile, medicine, petrochemical, drinking water disinfection and environmental protection industries. When chlorine is used as raw material to produce many industrial products, a large amount of by-product HCl gas will be produced. Generally, the water absorption method is used to make the by-product hydrogen chloride into low value-added hydrochloric acid for sale, but because the by-product HCl gas contains more or less Impu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J35/02B01J37/00C01B7/04B01J8/06B01J19/18
Inventor 乔旭陈献吕高明崔咪芬汤吉海吕志华王彦泽
Owner NANJING RESOURCES & ENVIRONMENT ENG TECH RES INST CO LTD
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