Multilayer composite metal oxide catalyst and preparation method thereof

A multi-layer composite and catalyst technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon-based compound preparation, organic compound preparation, etc., can solve the problem that the catalyst can no longer provide higher activity and reduce the catalyst reactivity , loading, dismantling, separation, catalyst recovery troubles and other problems

Active Publication Date: 2011-11-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1672790A provides a kind of catalyst that catalyzes the gas-phase oxidation of acrolein to produce acrylic acid. The catalyst contains molybdenum and vanadium, and also contains at least one volatile catalyst poisoning component. Reduce the temperature of the superheated part, and suppress the reduction of the reaction efficiency of thermal degradation
[0003] There is a problem in the above-mentioned methods of suppressing the generation of hot spots. The catalyst filled in the reaction tube is dilu

Method used

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  • Multilayer composite metal oxide catalyst and preparation method thereof
  • Multilayer composite metal oxide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Catalyst 1

[0033] Step 1: Prepare catalyst inner layer matrix

[0034] (1) Preparation of active component slurry (a)

[0035] Under stirring conditions, take 1147.6 grams of ammonium molybdate and 243.7 grams of cesium nitrate and dissolve them in 1000ml of pure water (water temperature above 65°C) to obtain a slurry (1), then take 1358.3 grams of bismuth nitrate and 407 grams of copper nitrate, and add 1000ml of pure water, fully stirred and mixed evenly to obtain slurry (2). Take 776 grams of nickel acetate and dissolve it in 1000 ml of pure water (water temperature above 65° C.) under stirring to obtain slurry (3). Then, the slurry (1) was mixed with the slurry (2), and then 50 grams of ammonia were added to obtain the slurry (4). After 20 minutes, the slurry (3) was slowly added to the slurry (4), and 91.9 grams of titanium dioxide were added simultaneously, 80 °C vigorously stirred for 2 hours.

[0036] (2) Preparation of auxiliary material sl...

Embodiment 2

[0054] Preparation of Catalyst 2

[0055] Step 1: Prepare catalyst inner layer matrix

[0056] (1) Preparation of active component slurry (a)

[0057] Under stirring conditions, take 1235.9 grams of ammonium molybdate and 97.5 grams of cesium nitrate and dissolve them in 1000ml of pure water (water temperature above 65°C) to obtain a slurry (1), then take 970 grams of bismuth nitrate and 599 grams of copper acetate, and add 1000ml of pure water, fully stirred and mixed evenly to obtain slurry (2). Then take 465.3 grams of nickel nitrate and dissolve it in 1000 ml of pure water (water temperature above 65° C.) with stirring to obtain slurry (3). Then, the slurry (1) was mixed with the slurry (2), and then 50 grams of ammonia were added to obtain the slurry (4). After 20 minutes, the slurry (3) was slowly added to the slurry (4), and 24 grams of titanium dioxide were added simultaneously, 80 °C vigorously stirred for 2 hours.

[0058] (2) Preparation of auxiliary material sl...

Embodiment 3

[0076] Step 1: Prepare catalyst inner layer matrix

[0077] (1) Preparation of active component slurry (a)

[0078] Under stirring conditions, take 1103.4 grams of ammonium molybdate and 97.5 grams of cesium nitrate and dissolve them in 1000ml of pure water (water temperature above 65°C) to obtain a slurry (1), then take 1940 grams of bismuth nitrate and 209.3 grams of copper nitrate, and add 1000ml of pure water, fully stirred and mixed evenly to obtain slurry (2). Then take 363.8 grams of nickel acetate and dissolve it in 1000 ml of pure water (water temperature above 65° C.) with stirring to obtain slurry (3). Then, the slurry (1) was mixed with the slurry (2), and then 60 grams of ammonia were added to obtain the slurry (4). After 20 minutes, the slurry (3) was slowly added to the slurry (4), and 47.9 grams of titanium dioxide were added simultaneously, 80 °C vigorously stirred for 2 hours.

[0079] (2) Preparation of auxiliary material slurry (b)

[0080] Under heatin...

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Abstract

The invention relates to a multilayer composite metal oxide catalyst. The multilayer composite metal oxide catalyst has the general formula as follows: Mo[a]Bi[b]Ni[c]Cs[d]Cu[e]Ti[f]A[g]B[h]C[i]O[j], wherein Mo is molybdenum, Bi is bismuth, Ni is nickel, Cs is cesium, Cu is copper, and Ti is titanium; A is at least one element selected from arsenic, tellurium, manganese, cerium, niobium, zirconium, rubidium, cadmium and germanium; B is at least one element selected from cobalt, boron, strontium, tantalum, alkali metal and alkaline earth metal; C is at least one element selected from vanadium, stannum, gallium, zinc, ferrum, tungsten and stibium; and O is oxygen. The composite metal oxide catalyst has a multilayer structure in which the concentrations of all the elements are reduced progressively from a matrix at the inner layer to the outer layer. The catalyst provided by the invention can effectively reduce the local heat accumulation of single pipe reactors and inhibit the formation of hot spots, and has the characteristics of high reactivity and selectivity and long service life.

Description

technical field [0001] The invention relates to a multi-layer composite metal oxide catalyst for the selective oxidation of propylene or isobutene to produce corresponding unsaturated aldehydes and a preparation method thereof. More specifically, it relates to a composite metal oxide catalyst with a multi-layer structure after multiple heat treatments and multiple coatings, which is used to catalyze the oxidation of propylene to produce acrolein or the oxidation of isobutene to produce isobutyraldehyde. Background technique [0002] The gas-phase catalytic oxidation reaction of propylene is an exothermic reaction. Hot spots will be generated in the catalyst bed, and the heat accumulated instantaneously will continue to accumulate, which will lead to the loss and shedding of the active components of the catalyst, so that the activity of the catalyst will decrease and its life will be shortened. The oxidation reaction aggravates the formation of by-products, and even causes a ...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/889B01J27/057C07C45/35C07C47/22
Inventor 王学丽景志刚刘肖飞南洋杨柏平李燕蒋满莉朱金明葛汉青杨珊珊王玲玲何颖曹凤霞
Owner PETROCHINA CO LTD
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