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Co-based catalyst, preparation method thereof and application of Co-based catalyst in eugenol conversion

A catalyst, a technology of eugenol, applied in the application of eugenol conversion, the field of Co-based catalyst preparation, to achieve the effects of high activity, improved stability and selectivity

Active Publication Date: 2018-03-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the literature survey, there is no report on the preparation of cobalt oxide, cobalt sulfide and Mo-doped cobalt molybdenum sulfide catalysts for the catalytic hydrogenation conversion of lignin model compounds using CoAl hydrotalcite as a precursor.

Method used

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  • Co-based catalyst, preparation method thereof and application of Co-based catalyst in eugenol conversion
  • Co-based catalyst, preparation method thereof and application of Co-based catalyst in eugenol conversion
  • Co-based catalyst, preparation method thereof and application of Co-based catalyst in eugenol conversion

Examples

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Embodiment 1

[0032] This embodiment illustrates the preparation of CoAl hydrotalcite of Co:Al=5:1 in the present invention

[0033] Weigh 0.1mol of cobalt nitrate and 0.02mol of aluminum nitrate dissolved in 250ml of deionized water, stir until clear; weigh 9.6g (0.24mol) of sodium hydroxide, 6.36g (0.06mol) of sodium carbonate dissolved in 250mol of deionized water , stir until clarification; drop the two solutions into 500ml deionized water at the same time, stir in a water bath at room temperature, control the titration rate at 1 drop / second, fine-tune the titration rate according to the pH, and ensure that the pH=9-10; after the titration , stop stirring, keep for 40min, and then transfer to an oven, the temperature is set at 70°C, and the crystallization time is set at 12h. After the crystallization, the precipitate was filtered and washed with deionized water until the pH was neutral, and the obtained precipitate was dried at 70° C. for 12 hours to obtain hydrotalcite with Co:Al=3:1....

Embodiment 2

[0035] This example illustrates the preparation of CoAl hydrotalcite of Co:Al=1:1 in the present invention

[0036] The preparation method is similar to Example 1, keeping other conditions unchanged, changing the weighing amounts of cobalt nitrate and aluminum nitrate to 0.06 mol and 0.06 mol respectively, to obtain hydrotalcite with Co:Al=1:1

Embodiment 3

[0038] This example illustrates the preparation of CoAl hydrotalcite of Co:Al=1:5 in the present invention

[0039] The preparation method is similar to that of Example 1, keeping other conditions unchanged, changing the weighing amounts of cobalt nitrate and aluminum nitrate to 0.02mol and 0.1mol respectively, to obtain hydrotalcite with Co:Al=1:5

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Abstract

The invention relates to a preparation method of a Co-based catalyst and application of the Co-based catalyst in eugenol conversion. The Co-based catalyst comprises a CoAl-O, CoAl-S or CoAlMo-S catalyst. CoAl hydrotalcite is taken as a precursor, and the Co-based catalyst in different existence forms, including cobalt oxide, cobalt sulfide and a Mo-doped cobalt molybdenum sulfide catalyst, is prepared, so that selectivity of catalyst activity is realized. The Co-based catalyst, taking activity of CoAlMo-S as an example, has the hydrodeoxygenation capability much higher than that of a commercially purchased CoMo / Al2O3 sulfide catalyst in catalytic conversion of a lignin model compound eugenol. Under the reaction conditions that pressure is at 3MPa, temperature is at 300 DEG C and time is 3hours, conversion rate of eugenol reaches 100%, a main product is a phenol product, and yield is higher than 60%. Stability of the catalyst is greatly improved, and the catalyst still maintains relatively high activity after beingrecycled many times.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis and bioenergy conversion, and relates to the preparation of catalysts and the application of reactions, in particular to a method for preparing a Co-based catalyst and its application in eugenol conversion. Background technique [0002] As a natural raw material with abundant reserves in the world, lignin has received more and more attention in recent years. At present, the utilization of lignin mainly includes liquid-gas reforming, fast pyrolysis, catalytic hydrogenation and other processes. Among them, hydrodeoxygenation of aromatic compounds in the lignin structure to prepare phenolic products is an important way to produce high value-added fine chemicals. [0003] Among hydrodeoxygenation catalysts, metal phosphides, carbides, and nitrides all show excellent catalytic activity, but their industrial application is limited due to their poor stability and complicated preparation pro...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J27/043B01J27/051C07C1/20C07C37/055C07C39/10C07C9/04
CPCB01J23/002B01J23/75B01J27/043B01J27/0515C07C1/20C07C37/055C07C2523/75C07C2527/043C07C2527/051C07C39/10C07C9/04Y02P20/52
Inventor 纪娜刁新勇黄艺博张晴张罗云宋春风刘庆岭
Owner TIANJIN UNIV
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