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Application of molybdenum-based catalyst to prepare organic chemicals from lignin

A molybdenum-based catalyst and organic chemical technology, applied in recycling technology, plastic recycling, etc., can solve problems such as decomposition difficulties, and achieve the effects of good atomic economy, high product yield, and high added value.

Active Publication Date: 2014-07-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since lignin is an extremely complex network polymer with a stable chemical structure, it is very difficult to decompose it into small molecules; in addition, lignin also contains a large number of functional groups, and the small molecule intermediates produced during the degradation process are extremely easy to repolymerize into Large molecular compounds, so it is quite challenging to convert lignin into small molecular compounds with high efficiency and high selectivity
At present, there is no report on the efficient catalytic degradation of lignin with molybdenum-based catalysts.

Method used

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  • Application of molybdenum-based catalyst to prepare organic chemicals from lignin
  • Application of molybdenum-based catalyst to prepare organic chemicals from lignin
  • Application of molybdenum-based catalyst to prepare organic chemicals from lignin

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Effect test

Embodiment 1

[0040] The preparation of embodiment 1 catalyst

[0041] Weigh ammonium heptamolybdate and dissolve it in ammonia solution, then impregnate the same volume on the acidified activated carbon (AC) carrier, and after drying in an oven at 120°C for 12 hours, the catalyst precursor is subjected to a temperature-programmed carbonization reaction. The specific reaction process is as follows: in H 2 In the atmosphere, 0.5g of the precursor was placed in a quartz reaction tube and the temperature was raised to 350°C and kept for 12h. The gas was then switched to 15% CH by volume 4 / H 2 , the temperature was raised to 590°C, kept for 2h, and then rapidly lowered to room temperature 25°C. The resulting catalyst with a molybdenum loading of 30 wt%, expressed as Mo 2 C / AC (30wt%Mo 2 C / AC).

Embodiment 2

[0042] The preparation of embodiment 2 catalyst

[0043] The preparation method of the catalyst is the same as in Example 1, and the difference from Example 1 is that the concentration of ammonium molybdate in the impregnating solution can be changed, or catalysts with different loads can be obtained through multiple impregnations. For example, the loading of Mo is 1wt%, 5wt%, 10wt%, 15wt%, 20wt%, 30wt%, 50wt% and 80wt% Mo 2 C / AC catalyst.

Embodiment 3

[0044] The preparation of embodiment 3 catalyst

[0045] Catalyst preparation method is the same as embodiment 1, and the difference with embodiment 1 is that activated carbon (AC) carrier is replaced by alumina (Al 2 o 3 ), silicon dioxide (SiO 2 ) or silicon carbide (SiC) supports, catalysts supported on different supports can be obtained. Such as Mo 2 C / Al 2 o 3 、Mo 2 C / SiO 2 、Mo 2 C / SiC catalyst.

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Abstract

The invention discloses a method for preparing organic chemicals from lignin. The method comprises: taking a catalyst employing a transition metal molybdenum as an active site to perform catalysis on reactions, heating to 230-350 DEG C, stirring to react for 0.5 h-12 h, after the reaction is finished, filtering out the solid catalyst, and performing rotary evaporation to obtain liquid products. The catalytic process of the technical scheme has extremely high product efficiency, the product total yield is up to 90%, the products comprise monophenols and other aromatic compounds used in large scale in industry, the added value is high, and the application has extremely good industrial application prospect.

Description

technical field [0001] The present invention relates to a method for converting biomass to liquid fuels and organic chemicals, more specifically, to one-step catalytic decomposition of lignin into compounds including alcohols, ethers, benzyl alcohols, phenols, and single-ring aromatic compounds process of organic chemicals. Background technique [0002] In recent years, due to the depletion of non-renewable resources such as coal, oil, and natural gas, the development and utilization of renewable resources has become an urgent task for us. Biomass resources are the most extensive renewable resources in the world, including cellulose, hemicellulose, and lignin, among which cellulose and hemicellulose have been widely used, and account for more than 25% of the total biomass. Lignin has not been widely used so far, not only causing waste of resources, but also causing environmental pollution. [0003] Lignin conversion technology has been studied a lot, and the reported metho...

Claims

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Application Information

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IPC IPC(8): C08J11/10C08J11/16C08L97/00
CPCY02W30/62
Inventor 李永丹马睿
Owner TIANJIN UNIV
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