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Three-layer multi-metal oxide catalyst and preparation method thereof

A technology of multi-metal oxides and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, preparation of carbon-based compounds, etc., can solve the problem of high initial catalyst activity, permanent reduction in reaction activity, Reduce catalyst utilization and other issues

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

[0003] There is a problem in the above-mentioned methods of suppressing hot spots, the catalyst packed into the reaction tube is diluted in various forms from the inlet to the outlet, which not only brings troubles in loading, dismantling, separating and recovering the catalyst, but also reduces the Utilization rate, especially in industrial long-term operation, catalyst activity declines faster, affecting catalyst life
Furthermore, due to the high initial activity of the catalyst, the catalyst is generally diluted in different proportions and placed in the reaction tube in sections to minimize the temperature of the hot zone. The disadvantage of this dilution method is that after the catalyst is diluted, Even if the activity of the catalyst decreases after a certain period of operation, the catalyst can no longer provide higher activity, that is to say, the actual reactivity of the catalyst is permanently reduced by dilution, unless it is reactivated and refilled

Method used

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  • Three-layer multi-metal oxide catalyst and preparation method thereof
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of Catalyst 1

[0037] The first step: preparation of catalyst inner layer matrix

[0038] (1) Preparation of active component slurry (a)

[0039] Under stirring conditions, 123.6 grams of ammonium molybdate, 24.9 grams of nickel acetate and 14.56 grams of cobalt nitrate were dissolved in 500 ml of pure water (water temperature above 65°C) to obtain a slurry (1), and then 145.3 grams of bismuth nitrate was dissolved in dilute nitric acid , to obtain solution (2). Then, the slurry (2) is mixed with the slurry (1), and then 30 grams of silicon oxide powder is added to obtain the slurry (3), and vigorously stirred for co-precipitation reaction to obtain the active component slurry (a).

[0040] (2) Preparation of auxiliary material slurry (b)

[0041] Under heating and stirring, 2.53 grams of potassium nitrate, 36.9 grams of magnesium nitrate, 46.52 grams of copper nitrate and 3.8 grams of ammonium chromate were dissolved in 250 ml of pure water, and vigorou...

Embodiment 2

[0053] Preparation of Catalyst 2

[0054] The first step: preparation of catalyst inner layer matrix

[0055] (1) Preparation of active component slurry (a)

[0056] Under stirring conditions, 97 grams of ammonium molybdate, 58.2 grams of nickel nitrate and 29.1 grams of cobalt nitrate were dissolved in 500 ml of pure water (water temperature above 65°C) to obtain a slurry (1), and then 169.8 grams of bismuth nitrate was dissolved in dilute nitric acid , to obtain slurry (2). Then, the slurry (2) was mixed with the slurry (1), and then 21 grams of silicon oxide powder was added to obtain the slurry (3), and vigorously stirred for co-precipitation reaction to obtain the active component slurry (a).

[0057] (2) Preparation of auxiliary material slurry (b)

[0058] Under heating and stirring, 20.2 grams of potassium nitrate, 60.6 grams of ferric nitrate and 6.2 grams of boric acid were dissolved in 250 ml of pure water, vigorously stirred and mixed uniformly to obtain catalys...

Embodiment 3

[0070] Preparation of Catalyst 3

[0071] The first step: preparation of the catalyst inner layer matrix

[0072] (1) Preparation of active component slurry (a)

[0073] The preparation of the active component slurry (a) is the same as that of catalyst 1. Take 105.9 grams of ammonium molybdate, 37.3 grams of nickel acetate, 43.7 grams of cobalt nitrate, 194 grams of bismuth nitrate and 18 grams of silicon oxide powder, and other conditions remain unchanged.

[0074] (2) Preparation of auxiliary material slurry (b)

[0075] The preparation of auxiliary material slurry (b) is the same as catalyst 1, 10.6 grams of strontium nitrate, 9.9 grams of potassium manganate and 21 grams of sodium nitrate are taken, and other conditions remain unchanged.

[0076] (3) Preparation of catalyst inner layer matrix

[0077] The preparation of the catalyst inner layer matrix is ​​the same as catalyst 1, and the composition of the catalyst inner layer matrix is ​​Mo 12 Bi 8 Ni 3 co 3 Si 6 ...

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Abstract

The invention provides a three-layer multi-metal oxide catalyst and a preparation method thereof. The catalyst contains various metal oxides which are taken as active ingredients; and the composition of the active ingredients can be expressed by the following general formulas: MoaBibNieCogSihAiBjCkOx (I), MoaBibNieTifOm (II) and MoaBibSicAldOn (III). The catalyst is applicable to the process of producing corresponding unsaturated aldehyde by selectively oxidizing propylene or isobutene, and can effectively prevent a large number of byproducts from being generated because high-concentration organic substances in feed gas are initially contacted with the catalyst to form higher hot spots, so that the selectivity of catalyst is improved.

Description

technical field [0001] The invention relates to a three-layer multi-metal oxide catalyst for the selective oxidation of propylene or isobutene to produce corresponding unsaturated aldehydes and a preparation method thereof. More specifically, the present invention relates to a three-layer multi-metal oxide catalyst with different catalytic activities coated with thermal material for multiple times, 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 a strong exothermic reaction. Different degrees of heat zones will be generated in the macroscopic particle phase of the catalyst. The instantaneous heat generated will continue to accumulate, which will lead to the sublimation and loss of the active components of the catalyst, which will reduce the activity of the catalyst and cause The formation of by-products i...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/889B01J37/02C07C45/35C07C47/22
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郭珺何颖王玲玲杨珊珊蔡小霞
Owner PETROCHINA CO LTD
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