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A kind of molybdenum-boron/sepiolite catalyst and its preparation method and application

A sepiolite and catalyst technology, which is applied in the field of molybdenum-boron/sepiolite catalyst and its preparation, can solve the problems that it is difficult to adapt to the large-scale industrial application of lignin, lack of acid-base active sites, difficult to achieve rectification and purification, etc. problem, to achieve the effect of improving the efficient and comprehensive utilization of lignin, easy implementation, and reducing the cost of depolymerization

Active Publication Date: 2021-10-26
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical methods are mainly divided into catalytic thermal cracking, catalytic hydrogenolysis, and biological enzymatic hydrolysis. The main problems faced by catalytic thermal cracking are: the depolymerization products are very complex, distillation and purification are difficult to achieve, and the products have high oxygen content and high viscosity, which cannot be used as Fuels are applied directly to energy end customers
The use of noble metal carbon-supported catalysts in the catalytic hydrogenolysis process has high costs, lack of acid-base active sites, and low depolymerization yields
The biological method is to use biological enzymes as catalysts to realize the depolymerization of lignin, but the depolymerization speed is slow, time-consuming, catalyst cost is high and easy to deactivate, so it is difficult to adapt to the large-scale industrial application of lignin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of molybdenum-boron / sepiolite catalyst and depolymerization of lignin by supercritical system synergistic molybdenum-boron / sepiolite catalyst

[0030] The preparation method of molybdenum-boron / sepiolite catalyst comprises the following steps:

[0031] Calcinate the sepiolite raw material at 500°C for 4 hours, then take 10g of the calcined sepiolite raw material, add it to 5mol / L nitric acid, stir and mix it under heating in a water bath at 60°C, and carry out suction filtration after mixing evenly. Wash the filter cake obtained by suction filtration with deionized water until neutral, and then dry to obtain solid I; put solid I in a tube furnace, heat it to 500 °C at a heating rate of 2 °C / min, and then Medium roasting for 4h to obtain purified sepiolite; weigh 2.2990g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 3.1220g of boric acid were placed in a 250mL round-bottomed beaker, and 100mL of deionized water was added to form a solution I after they were completely ...

Embodiment 2

[0036] Preparation of molybdenum-boron / sepiolite catalyst and depolymerization of lignin by supercritical system synergistic molybdenum-boron / sepiolite catalyst

[0037] The preparation method of molybdenum-boron / sepiolite catalyst comprises the following steps:

[0038]Calcinate the sepiolite raw material at 500°C for 4 hours, then take 10g of the calcined sepiolite raw material, add it to 5mol / L nitric acid, stir and mix it under heating in a water bath at 60°C, and carry out suction filtration after mixing evenly. Wash the filter cake obtained by suction filtration with deionized water until neutral, and then dry to obtain solid I; put solid I in a tube furnace, heat it to 500°C at a heating rate of 3°C / min, and then Medium roasting for 4h to obtain purified sepiolite; weigh 0.4840g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.3122g of boric acid were placed in a 250mL round bottom beaker, and 100mL of deionized water was added to form solution I after completely dissolving; weigh...

Embodiment 3

[0043] Preparation of molybdenum-boron sepiolite catalyst and supercritical system synergistic molybdenum-boron / sepiolite catalyst depolymerization of lignin

[0044] The preparation method of molybdenum-boron / sepiolite catalyst comprises the following steps:

[0045] Calcinate the sepiolite raw material at 500°C for 4 hours, then take 10g of the calcined sepiolite raw material, add it to 5mol / L nitric acid, stir and mix it under heating in a water bath at 60°C, and carry out suction filtration after mixing evenly. Wash the filter cake obtained by suction filtration with deionized water until neutral, and then dry to obtain solid I; put solid I in a tube furnace, heat it to 500°C at a heating rate of 3°C / min, and then Medium roasting for 4h to obtain purified sepiolite; weigh 0.6921g (NH 4 ) 6 Mo 7 o 24 4H 2 O and 2.1854g of boric acid were placed in a 250mL round-bottomed beaker, and 100mL of deionized water was added to form a solution I after they were completely disso...

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Abstract

The invention discloses a molybdenum-boron / sepiolite catalyst and its preparation method and application. The molybdenum-boron / sepiolite catalyst includes sepiolite as a carrier and the active component loaded on the sepiolite molybdenum and boron. The molybdenum-boron / sepiolite catalyst of the present invention has a wide range of sources of raw material sepiolite, low cost, environmental protection, can effectively reduce depolymerization costs, and is suitable for large-scale industrial applications, and the molybdenum-boron / sepiolite catalyst of the present invention Cooperating with the supercritical system, the conversion rate of depolymerized lignin is high, the selectivity of substituted phenols and carboxylic acid compounds is high, and the catalyst can be recycled more than 50 times.

Description

technical field [0001] The invention relates to the technical field of catalyst and lignin depolymerization, in particular to a molybdenum-boron / sepiolite catalyst and its preparation method and application. Background technique [0002] Lignin is a renewable resource with abundant aromatic ring structure and low price. Lignin is a complex polymer compound that mainly exists in the woody part of plants. Its dry weight accounts for 20% to 35% of biomass, and the energy contained in it accounts for more than 40%. Therefore, the transformation and utilization of lignin directly affect the production of biomass. energy efficiency. Lignin is abundant in nature and has a wide range of sources. Every year, nearly 50 million tons of industrial lignin are extracted from the cooking waste liquid of the pulp and paper industry. A small part of it is used as an additive for building materials, and most of it is burned as cheap fuel. Or direct discharge, which not only causes waste of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28C07C51/00C07C59/90
CPCB01J23/28C07C51/00C07C59/90Y02P20/54Y02P20/584
Inventor 王一双汤志远陈明强汪春生杨忠连张涵王君
Owner ANHUI UNIV OF SCI & TECH
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