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A kind of manganese-based supported catalyst and its preparation method and application

A catalyst and carrier technology, which is applied in the field of manganese-based supported catalysts for producing isobutene with high selectivity and its preparation, can solve the problems that methyl bromide can be synthesized with high selectivity to isobutene, and the selectivity of a single product is not high, and the preparation method is simple, The effect of mild reaction conditions and easy industrialization

Active Publication Date: 2018-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technology with higher value-added low-carbon olefins as the target product, the selectivity of a single product is not high, and no relevant reports have been found on the synthesis of isobutene with high selectivity from methyl bromide

Method used

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  • A kind of manganese-based supported catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh commercially available alumina carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), using dimethylformamide aqueous solution with a molar concentration of 0.1 mol / L to spray and impregnate the alumina support, the spraying amount is 3 / 4 of the saturated absorption solution of the alumina support, Dry at 150°C for 1h. Weigh an appropriate amount of manganese nitrate and dissolve it in deionized water, add ammonium thiocyanate so that the mass fraction of ammonium thiocyanate in the solution is 2%, and the manganese salt solution is loaded on the above-mentioned alumina carrier by equal volume impregnation method, and dried at 100 °C 6h, calcination at 450°C for 6h to prepare the catalyst precursor. The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide is 60%, a...

Embodiment 2

[0031] Weigh commercially available alumina carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), using dimethylformamide aqueous solution with a molar concentration of 0.5 mol / L to spray and impregnate the alumina carrier, the spraying amount is 1 / 5 of the saturated absorption solution of the alumina carrier, Dry at 70°C for 18h. Weigh an appropriate amount of manganese nitrate and dissolve it in deionized water, add ammonium thiocyanate so that the mass fraction of ammonium thiocyanate in the solution is 15%, and the manganese salt solution is loaded on the above-mentioned alumina carrier by equal volume impregnation method, and dried at 100 °C 6h, and calcined at 400°C for 8h to prepare the catalyst precursor. The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide is 60%,...

Embodiment 3

[0035] Weigh commercially available alumina carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), using dimethylformamide aqueous solution with a molar concentration of 0.3 mol / L to spray and impregnate the alumina carrier, the spraying amount is 1 / 2 of the saturated absorption solution of the alumina carrier, Dry at 90°C for 8h. Weigh an appropriate amount of manganese nitrate and dissolve it in deionized water, add ammonium thiocyanate so that the mass fraction of ammonium thiocyanate in the solution is 10%, and the manganese salt solution is loaded on the above-mentioned alumina carrier by equal volume impregnation method, and dried at 120 °C 4h, calcination at 500°C for 4h to prepare the catalyst precursor. The catalyst precursor is placed in a continuous flow fixed-bed reactor, and the catalyst precursor is treated with a mixed gas of methyl bromide and nitrogen. The volume concentration of methyl bromide is 60%, a...

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Abstract

The invention discloses a manganese-based supported catalyst and a preparing method and application thereof. The catalyst is prepared through the following steps that firstly, aluminum oxide serves as a supporter, is sprayed and soaked with a dimethyl formamide aqueous solution with the mole concentration of 0.1 mol / L-0.5 mol / L and is dried, wherein the spraying amount is 1 / 5-3 / 4 the saturated adsorption solution amount of the aluminum oxide supporter; secondly, the dried supporter obtained in the first step is soaked with a manganese salt solution in a saturated mode, and is dried and roasted, wherein 2-15% by mass of ammonium thiocyanate is contained in the manganese salt solution; thirdly, the material roasted in the second step is brominated to make the content of manganese oxide in the catalyst be 0.5-5%, preferably, 1-3%, by weight and the content of manganese bromide in the catalyst be 5-40%, preferably, 10-30%. The catalyst can remarkably improve the selectivity of isobutene.

Description

technical field [0001] The invention relates to a manganese-based supported catalyst and its preparation method and application, in particular to a manganese-based supported catalyst for producing isobutene with high selectivity using methyl bromide as a raw material, its preparation method and application. Background technique [0002] Isobutene is an important basic organic chemical raw material. Its derivative products are numerous, the upstream and downstream industrial chains are complicated, and the consumption structure shows a trend of diversification. A variety of high value-added products can be prepared from isobutylene, such as: butyl rubber, polyisobutylene, methyl tert-butyl ether, isoprene and organic glass and other organic chemical raw materials and fine chemical products. As the market scale of isobutene downstream products continues to expand, the contradiction between supply and demand will gradually become prominent, especially in the context of the depl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/08C07C11/09C07C1/26
Inventor 李杰张信伟张舒冬孙晓丹倪向前尹泽群刘全杰张喜文
Owner CHINA PETROLEUM & CHEM CORP