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Co/sepiolite catalyst and preparation method and application thereof

A sepiolite and catalyst technology, which is applied in the field of Co/sepiolite catalyst and its preparation, can solve the problems such as difficulty in adapting to large-scale industrial application of lignin, difficulty in rectification and purification, lack of acid-base active sites, and the like, Achieve sustainable development of social benefits, improve efficient comprehensive utilization, and easy implementation.

Inactive Publication Date: 2018-05-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological method is to use biological enzymes as catalysts to degrade lignin, but the degradation speed is slow, time-consuming, catalysts are expensive and easy to deactivate, so it is difficult to adapt to the large-scale industrial application of lignin
Chemical methods are mainly divided into catalytic thermal cracking, catalytic hydrogenolysis and other methods. The main problems faced by catalytic thermal cracking are: the degradation products are very complex, distillation purification is difficult to achieve, the product has high oxygen content and high viscosity, and cannot be directly used as fuel for energy end customer
The use of noble metal carbon-supported catalysts in the catalytic hydrogenolysis process has high cost, lack of acid-base active sites, and low degradation yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of Co / sepiolite catalyst and microwave field synergy of Co / sepiolite catalyst for lignin degradation

[0027] The preparation of Co / sepiolite catalyst comprises the following steps:

[0028] Calcinate the sepiolite raw material at 600°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 it is neutral, and then dry it to obtain solid I; put solid I in a tube furnace, heat it to 600°C at a heating rate of 2°C / min, and then Medium roasting for 4h to obtain purified sepiolite; weigh 2.61gCO(NO 3 ) 2 ·6H 2 O, the amount of the prepared substance is an aqueous solution with a concentration of 0.1mol / L, add 10g of purified sepiolite, stir in a water bath at 60°C for 2 hours, add 5mol / L NaOH solution dropwise to adjust the pH value t...

Embodiment 2

[0033] Preparation of Co / sepiolite catalyst and microwave field synergy of Co / sepiolite catalyst for lignin degradation

[0034] The preparation of Co / sepiolite catalyst comprises the following steps:

[0035] Calcinate the sepiolite raw material at 600°C for 4 hours, then take 10g of the calcined sepiolite raw material, add it to 5mol / L nitric acid, stir and mix under heating in a water bath at 60°C, and perform suction filtration after mixing evenly. The filter cake obtained by suction filtration was washed with water until neutral, and then dried to obtain solid I; solid I was placed in a tube furnace, heated to 700 °C at a heating rate of 4 °C / min, and roasted in an air atmosphere for 5 hours, to obtain purified sepiolite; weigh 3.16gCO(NO 3 ) 2 ·6H 2 O, the amount of the prepared substance is an aqueous solution with a concentration of 0.1mol / L, add 10g of purified sepiolite, stir for 2h under heating in a water bath at 60°C, and add 5mol / L of NH dropwise 3 ·6H 2 O s...

Embodiment 3

[0040] Preparation of Co / sepiolite catalyst and microwave field synergy of Co / sepiolite catalyst for lignin degradation

[0041] The preparation of Co / sepiolite catalyst comprises the following steps:

[0042] Calcinate the sepiolite raw material at 600°C for 4 hours, then take 10g of the calcined sepiolite raw material, add it to 5mol / L nitric acid, stir and mix under heating in a water bath at 60°C, and perform suction filtration after mixing evenly. Wash the filter cake obtained by suction filtration with water until it is neutral, and then dry it to obtain solid I; put solid I in a tube furnace, heat it to 800 °C at a heating rate of 6 °C / min, and roast it in an air atmosphere for 6 hours, to obtain purified sepiolite; weigh 5.50gCO(NO 3 ) 2 ·6H 2 O, the amount of the prepared substance is an aqueous solution with a concentration of 0.1mol / L, add 10g of purified sepiolite, stir in a water bath at 60°C for 2 hours, add 5mol / L NaOH solution dropwise to adjust the pH value...

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PUM

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Abstract

The invention discloses a Co / sepiolite catalyst and a preparation method and application thereof. The Co / sepiolite catalyst includes sepiolite serving as a carrier and Co serving as an active component and loaded on the surface of the sepiolite. According to the Co / sepiolite catalyst, sepiolite serving as a raw material is wide in source and low in cost, the degradation cost can be effectively reduced, and the Co / sepiolite catalyst is suitable for large-scale industrial application. Moreover, the Co / sepiolite catalyst is cooperated with a microwave field, the conversion rate of degraded ligninis very high, the conversion rate of lignin can reach 85% or above, the selectivity of a phenolic compound exceeds 55%, and the selectivity of guaiacol exceeds 20%.

Description

technical field [0001] The invention relates to the technical field of catalyst and lignin degradation, in particular to a Co / sepiolite catalyst and its preparation method and application. Background technique [0002] Lignin is a renewable resource with an aromatic ring structure, abundant sources and low price. Lignin is a complex polymer compound mainly present in the woody parts of plants, and together with cellulose and hemicellulose constitute the three major components of biomass. Although its dry weight only accounts for 10% to 35% of biomass, the energy contained in it accounts for more than 40%. Therefore, the transformation and utilization of lignin directly affect the energy utilization efficiency of biomass. 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 material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/78B01J37/08B01J37/02B01J37/18C07C37/54C07C39/00C07C41/01C07C41/18C07C41/26C07C43/23
CPCB01J23/78B01J37/0201B01J37/088B01J37/18C07C37/54C07C41/01C07C41/18C07C41/26C07C39/00C07C43/23
Inventor 陈明强曹禹王一双杨忠连梁添
Owner ANHUI UNIV OF SCI & TECH
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