Catalyst for preparing tetrahydronaphthalene by naphthalene via selective hydrogenation as well as preparation method and application thereof

A naphthalene selectivity and catalyst technology, which is applied in the field of catalytic material preparation technology and application, can solve the problems of insufficient catalytic performance, low catalytic activity and selectivity, and small specific surface area of ​​phosphide, so as to avoid cumbersome steps and environment Friendly, energy saving effect

Inactive Publication Date: 2014-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​non-supported phosphide is small, the dispersion of active centers is low, and serious aggregation occurs on the particle surface, and its catalytic performance is not fully exerted during the reaction process, resulting in low catalytic activity and selectivity.

Method used

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  • Catalyst for preparing tetrahydronaphthalene by naphthalene via selective hydrogenation as well as preparation method and application thereof
  • Catalyst for preparing tetrahydronaphthalene by naphthalene via selective hydrogenation as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1: Preparation of Y molecular sieve supported molybdenum phosphide catalyst

[0056] Add a certain amount of diammonium hydrogen phosphate into deionized water (the mass fraction of the aqueous solution of diammonium hydrogen phosphate is 10-30wt%). After fully dissolving, add the measured ammonium molybdate and fully dissolve to form a clear and transparent solution.

[0057] Weigh the quantitative Y molecular sieve, place it in a vacuum device, keep it under the vacuum of 0.1MPa for 1 hour, and add the solution containing ammonium dihydrogen phosphate and ammonium molybdate under this vacuum degree, and after the Y molecular sieve is completely impregnated, put It was moved into a sonotrode and continued to immerse for 12 hours under 80HKz ultrasonic conditions.

[0058] Put the above impregnated body in the roasting equipment, heat to 120°C for 6 hours at a heating rate of 5°C / min in an air atmosphere to remove adsorbed water, and then heat to 350°C for 6 ...

Embodiment 2

[0061] Example 2: Preparation of cobalt phosphide / tungsten phosphide composite catalyst supported by beta / Y composite molecular sieve carrier

[0062] Add a certain amount of diammonium hydrogen phosphate into deionized water (the mass fraction of the aqueous solution of diammonium hydrogen phosphate is 10-30wt%). After fully dissolving, add the measured cobalt nitrate and ammonium metatungstate and fully dissolve to form Clear and transparent solution.

[0063] Weigh the quantitative beta / Y molecular composite sieve carrier, place it in a vacuum device, keep it under a vacuum of 0.02MPa for 8 hours, and add a solution containing ammonium dihydrogen phosphate, cobalt nitrate and ammonium metatungstate under this vacuum , after the beta / Y composite molecular sieve carrier is completely impregnated, move it into an ultrasonic generator, and continue impregnating for 8 hours under 30HKz ultrasonic conditions.

[0064] Put the above-mentioned impregnated body in the roasting equi...

Embodiment 3

[0067] Example 3: Preparation of beta / Y / ZSM-5 composite molecular sieve carrier loaded nickel phosphide / molybdenum phosphide composite catalyst

[0068] Add a certain amount of diammonium hydrogen phosphate into deionized water (the mass fraction of the aqueous solution of diammonium hydrogen phosphate is 10-30wt%). After fully dissolving, add the metered nickel nitrate and ammonium molybdate and fully dissolve to form a clear Clear solution.

[0069] Weigh the quantitative beta / Y / ZSM-5 molecular composite sieve carrier, place it in a vacuum device, add a solution containing ammonium dihydrogen phosphate, nickel nitrate and ammonium molybdate under normal pressure, and wait for the beta / Y / ZSM-5 compound After the molecular sieve carrier is completely impregnated, it is moved into an ultrasonic generator, and is continuously impregnated for 4 hours under the condition of 80Hz ultrasonic wave.

[0070] Put the above impregnated body in the roasting equipment, heat to 150°C at a...

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Abstract

The invention discloses a catalyst applicable to preparing tetrahydronaphthalene by naphthalene via selective hydrogenation as well as a preparation method and an application thereof. The catalyst has the main characteristics that one or more than one of active carbon or a molecular sieve Y, beta and ZSM-5 is used as a carrier and transition metal phosphide is loaded. The transition metal phosphide accounts for 5%-30% of the total mass of the catalyst; the catalyst is prepared by the steps of impregnating, roasting, raising the temperature and reducing by a procedure and the like. In the preparation process, a vacuum-ultrasonic impregnation technology can be introduced. A fixed bed reactor is adopted to continuously produce the tetrahydronaphthalene under a suitable hydrogenation reaction condition; the naphthalene conversion rate and the tetrahydronaphthalene selectivity are more than 90%.

Description

technical field [0001] The invention belongs to the field of preparation technology and application of catalytic materials, and relates to a catalyst with high activity and high selectivity for the reaction of hydrogenation of naphthalene to prepare tetrahydronaphthalene, which uses activated carbon or molecular sieve as a carrier to support transition metal phosphide and its preparation method, in particular to the A preparation method of vacuum-ultrasonic impregnation combined with temperature-programmed reduction of catalyst is disclosed, and the prepared catalyst is used in the reaction of preparing tetrahydronaphthalene by hydrogenation of naphthalene. Background technique [0002] Tetrahydronaphthalene (tetralin, tetrahydronaphthalene) is an alicyclic aromatic hydrocarbon with a naphthalene odor. Tetralin can dissolve almost all organic matter, and has a high boiling point. Even if the temperature reaches 180°C, the evaporation amount is very small. It is an ideal high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/16B01J29/14B01J29/80B01J27/19B01J27/185B01J37/34C07C13/48C07C5/11
Inventor 李春山李聃张洪华王红岩张国梁张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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