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Catalyst for producing olefins and its preparation method and application

A catalyst, zinc oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrocarbon production from halogen-containing organic compounds, etc., can solve the problem that methyl bromide is not found to synthesize isobutene with high selectivity, and the selectivity of a single product is not high. , to achieve the effect of promoting removal, improving effect and easy industrialization

Active Publication Date: 2018-06-19
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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  • Catalyst for producing olefins and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh commercially available titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), use the unsaturated spray impregnation method to impregnate the nickel nitrate and gallium nitrate mixed aqueous solution with the molar concentration of nickel and gallium respectively 0.5mol / L and 1mol / L, the impregnation temperature is 50℃, The impregnation time is 3 hours, the impregnation amount is 20% of the saturated absorption solution of the titanium dioxide carrier, dried at 120°C for 5 hours, and calcined at 850°C for 6 hours. Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, load it on the above-mentioned calcined carrier by equal volume impregnation method, dry at 100°C for 6h, and calcinate at 500°C for 6h to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on a titania carrier...

Embodiment 2

[0034] Weigh commercially available titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), use the unsaturated spray impregnation method to impregnate the nickel nitrate and gallium nitrate mixed aqueous solution with the molar concentration of nickel and gallium respectively 0.2mol / L and 0.4mol / L, and the impregnation temperature is 60℃ , the impregnation time is 2h, the impregnation amount is 50% of the saturated absorption solution of the titanium dioxide carrier, dried at 120°C for 5h, and calcined at 800°C for 6h. Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, load it on the calcined titania carrier by equal volume impregnation method, dry at 120°C for 4 hours, and calcinate at 400°C for 8 hours to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on the titania carrier con...

Embodiment 3

[0038] Weigh commercially available titanium dioxide carrier (pore volume is 0.37ml / g, specific surface area is 103m 2 / g, strip shape, equivalent diameter 1.5mm), use the unsaturated spray impregnation method to impregnate the nickel nitrate and gallium nitrate mixed aqueous solution with the molar concentration of nickel and gallium respectively 0.75mol / L and 1.5mol / L, and the impregnation temperature is 40℃ , the impregnation time is 4h, the impregnation amount is 10% of the amount of the saturated absorption solution of the titanium dioxide carrier, dried at 80°C for 10h, and calcined at 900°C for 3h. Weigh an appropriate amount of cerium nitrate and dissolve it in deionized water, load it on the calcined titania carrier by equal volume impregnation method, dry at 80°C for 4 hours, and calcinate at 600°C for 4 hours to prepare a titania carrier containing cerium oxide. Then weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, load it on the titan...

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Abstract

The invention discloses a catalyst for producing olefins, a preparation method and application thereof. The catalyst is prepared by the following steps: (1) preparing a mixed aqueous solution of nickel salt and gallium salt, impregnating the above mixed aqueous solution with titanium dioxide as a carrier by an unsaturated impregnation method, drying and roasting at 700°C~1000°C for 1h-10h; Introducing cerium oxide into the calcined titania carrier; (2) introducing zinc oxide into the ceria-introduced titania carrier obtained in step (1); (3) brominating the catalyst precursor after introducing zinc oxide to make The weight content of zinc oxide in the catalyst is 0.5%-5%, preferably 1%-3%; the weight content of zinc bromide is 5%-40%, preferably 10%-30%. The catalyst can significantly improve the selectivity of isobutene.

Description

technical field [0001] The invention relates to a catalyst for producing olefins, a preparation method and application thereof, in particular to a catalyst for producing isobutene with high selectivity using methyl bromide as a raw material, a preparation method and application thereof. 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 depletion of oil resource...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138C07C11/09C07C1/26
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
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