Catalyst for preparing tetrahydronaphthalene through selective catalytic naphthaline hydrogenation and preparation method and application thereof

Abstract

The invention relates to a catalyst for preparing tetrahydronaphthalene through selective catalytic naphthaline hydrogenation and a preparation method and application thereof. Compared with naphthaline, tetrahydronaphthalene belongs to a high-value product. By adopting the method, the high added value and deep processing and fine utilization of downstream products of coal tar can be achieved. In the method, a high temperature and high pressure reaction still is adopted, and it is first found that the oxidation-state catalyst has the significant effect on tetrahydrothalene preparation through selective naphthalene hydrogenation. The used hydrogenation catalyst uses gamma-Al2O3 as a carrier and uses Ni and Mo as active metals, the content of the Al2O3 carrier is 70%-90%, the total load of the Ni and Mo is 12%-36%, and the Ni and Mo load ratio is 1:23 to 8:16. The invention provides a high-added utilization method of downstream products of coal tar, which has been ignored by people for along time. The used oxidation-state catalyst has the advantages of simple preparation, easy storage, good recycling 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...

AI Technical Summary

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

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