Catalyst for preparing tetrahydronaphthalene by selective catalytic hydrogenation of naphthalene, preparation method and application

A technology for selective and catalytic hydrogenation of naphthalene, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Harsh nickel preparation conditions, expensive precious metals and other issues, to achieve the effect of high value-added utilization, good reusability, and easy storage

Active Publication Date: 2021-04-27
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, precious metals are expensive and have poor sulfur resistance; reduced transition metals are expensive to prepare, difficult to store, and the preparation conditions of framework nickel are harsh.
[0007] At present, the general research aims to obtain high hydrogenation performance, and selective catalytic hydrogenation to prepare high value-added tetrahydronaphthalene has been neglected; at the same time, there are usually three forms of catalysts: oxidation state, reduction state and sulfuration state. Hydrogen catalysts and aromatics hydrogenation are mostly sulfided catalysts, but tests have found that oxidized catalysts also have hydrogenation performance, and no related reports have been seen

Method used

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  • Catalyst for preparing tetrahydronaphthalene by selective catalytic hydrogenation of naphthalene, preparation method and application
  • Catalyst for preparing tetrahydronaphthalene by selective catalytic hydrogenation of naphthalene, preparation method and application
  • Catalyst for preparing tetrahydronaphthalene by selective catalytic hydrogenation of naphthalene, preparation method and application

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preparation example Construction

[0042]The preparation method of the above-mentioned catalyst is as follows: the active component is loaded on the catalyst carrier by an equal-volume impregnation method, the catalyst is obtained by ultrasonication, standing still, drying and then roasting; wherein, the roasting temperature is 400-600°C. Preferably, the firing temperature is 450-550°C.

[0043] When the active component is two kinds of Co, Mo, Ni and W, the loading method is one-step impregnation loading or step-by-step impregnation loading, preferably one-step impregnation loading.

[0044] see figure 1 , the application of the catalyst in the reaction of preparing tetrahydronaphthalene by selective hydrogenation of naphthalene. The initial H of the reaction 2 The pressure is 2-10MPa, the reaction temperature is 160-240°C, and the reaction time is 2-10h.

[0045] Preferably, the initial H of the reaction 2 The pressure is 6-8MPa, the reaction temperature is 180-220°C, and the reaction time is 6-8h.

[00...

Embodiment 1

[0049] 4% NiO loading, MoO 3 Oxidation state NiO-MoO with a loading of 20% 3 / γ-Al 2 o 3 Preparation: Using the equal volume impregnation method, a certain amount of Ni salt (NiNO 3 ·6H 2 O) and Mo salt ((NH 4 ) 6 Mo 7 o 24 4H 2 O) adding a certain amount of distilled water to form a solution; dipping in γ-Al 2 o 3 On the carrier, after stirring evenly, ultrasonic for half an hour, let stand at room temperature for 12h; then dry at 120°C for 4h, and bake at 500°C for 4h; the oxidation state 4%NiO-20%MoO can be obtained 3 / γ-Al 2 o 3 .

Embodiment 2

[0057] A catalyst with a nickel-molybdenum loading of 12% was prepared by one-step impregnation (the mass ratio of nickel oxide to molybdenum oxide was 1:5).

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Abstract

A catalyst for the selective catalytic hydrogenation of naphthalene to prepare tetrahydronaphthalene, its preparation method and application. Compared with naphthalene, tetralin is a high-value product, and the method can realize high added value and deep processing of downstream products of coal tar. use. The method adopts a high-temperature and high-pressure reactor, and it is found for the first time that the catalyst in an oxidation state has a significant effect on the selective hydrogenation of naphthalene to prepare tetrahydronaphthalene. Wherein the hydrogenation catalyst used is composed as follows: with γ-Al 2 o 3 as carrier, Ni and Mo as active metals, Al 2 o 3 The content of the carrier is 70%-90%, the total loading of Ni and Mo is 12%-36%, and the loading ratio of Ni and Mo is 1:23-8:16. The invention proposes a high additional utilization method of downstream products of coal tar which has been neglected by people, and the used oxidation state catalyst has the advantages of simple preparation, easy storage, good cycle stability, easy regeneration and the like.

Description

technical field [0001] The invention belongs to the field of deep processing of coal tar, and in particular relates to a catalyst for preparing tetrahydronaphthalene by selective catalytic hydrogenation of naphthalene, a preparation method and an application. Background technique [0002] Compared with petroleum resources, coal tar resources are irreplaceable; foreign countries regard coal tar as an important resource to protect. At present, the domestic coal tar processing technology is relatively backward, and the deep processing is insufficient, and it only stays in the rough processing stage. A lot of coal tar is exported, and the phenomenon of resale of processed coal tar products is serious, causing China to suffer huge economic losses. [0003] As a bicyclic aromatic hydrocarbon, naphthalene is an important chemical raw material; its output can be used as a symbol to measure the development level of organic chemical industry. The naphthalene content in coal tar is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/883C07C13/48C07C5/11
CPCB01J23/883C07C5/11C07C13/48
Inventor 孙鸣苏小平张勇赵阳坤么秋香郝青青马晓迅
Owner NORTHWEST UNIV
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