Lanthanum-supported composite oxide solid catalyst as well as preparation method and applications of catalyst

A solid catalyst, composite oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as no stable industrialized production methods, and achieve Easy to achieve industrialization, mild reaction conditions, and high catalytic efficiency

Active Publication Date: 2013-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no stable industrial production method for straw raw materials with light volume and weight

Method used

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  • Lanthanum-supported composite oxide solid catalyst as well as preparation method and applications of catalyst
  • Lanthanum-supported composite oxide solid catalyst as well as preparation method and applications of catalyst
  • Lanthanum-supported composite oxide solid catalyst as well as preparation method and applications of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of composite oxide solid catalyst by co-precipitation method: 6.445g ZrOCl 2 .8H 2 O, 0.013g La(NO 3 ) 3 .6H 2 O was dissolved in 100mL ultrapure water, and 3.7938g of TiCl was added dropwise while stirring 4 Solution, and then adjust the pH to 8 with concentrated ammonia water, stand still at 25°C for 16h, dry at 100°C for 16h, grind, and calcinate at 450°C for 3h in a muffle furnace to obtain TiO 2 -ZrO 2 / La; figure 1 Be the infrared spectrogram of gained product, figure 11400cm -1 is a solid catalyst TiO 2 -ZrO 2 characteristic absorption peaks. figure 2 It is a transmission electron microscope picture of the obtained product, and it can be seen from the figure that the obtained product is a nano-scale round particle and has a strong aggregation effect.

[0023] (2) Hydrolysis reaction: put 0.2 xylose and 0.01 g of the composite oxidation catalyst prepared in step (1) into a three-necked flask, add 10 mL of distilled water, and react at 10...

Embodiment 2

[0031] (1) Composite oxidation catalyst prepared by co-precipitation method: 6.445g ZrOCl 2 .8H 2 O, 0.65g La(NO 3 ) 3 .6H 2 O was dissolved in 100mL ultrapure water, and 7.5876g of TiCl was added dropwise while stirring 4 Solution, and then adjust the pH to 10 with concentrated ammonia water, stand at 30°C for 24h, dry at 110°C for 30h, grind, and calcinate in a muffle furnace at 550°C for 5h to obtain TiO 2 -ZrO 2 / La;

[0032] (2) Hydrolysis reaction: put 0.2 xylose and 0.1 g of the composite oxidation catalyst ore prepared in step (1) into a three-necked flask, add 60 mL of distilled water, and react at 140 ° C for 8 h;

[0033] (3) Post-treatment: After the reaction in step (2), cool naturally, filter with suction, distill and concentrate the filtrate, extract with dichloromethane, and distill to obtain furfural.

[0034]Calculated by the method described in Example 1, the yield of furfural in this example is 766.5 μmol / g, and the conversion rate of xylose is 44%. ...

Embodiment 3

[0036] (1) Composite oxidation catalyst prepared by co-precipitation method: 6.445g ZrOCl 2 .8H 2 O, 1.3g La(NO 3 ) 3 .6H 2 O was dissolved in 100mL ultrapure water, and 11.3814g of TiCl was added dropwise while stirring 4 Solution, then adjust the pH to 12 with concentrated ammonia water, stand still at 40°C for 36h, dry at 120°C for 40h, grind, and calcinate in a muffle furnace at 650°C for 3h to obtain TiO 2 -ZrO 2 / La;

[0037] (2) Hydrolysis reaction: put 0.2 xylose and 0.02 g of the composite oxidation catalyst ore prepared in step (1) into a three-necked flask, add 100 mL of distilled water, and react at 180 ° C for 12 h;

[0038] (3) Post-treatment: After the reaction in step (2), cool naturally, filter with suction, distill and concentrate the filtrate, extract with dichloromethane, and distill to obtain furfural.

[0039] Calculated by the method described in Example 1, the yield of furfural in this example is 1022.8 μmol / g, and the conversion rate of xylose i...

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Abstract

The invention discloses a lanthanum-supported composite oxide solid catalyst as well as a preparation method and applications of the catalyst. The preparation method comprises the steps of: adding ZrOCl2. 8H2O in distilled water, stirring for dissovling, dripping a TiCl4 solution, then adding nitrate La(NO3)3.6H2O of rare-earth metal lanthanum, adjusting pH by using stronger ammonia water, standing for 16-36hours at the temperature of 20-40 DEG C, filtering, settling, washing with distilled water until chloride ions do not exist, drying in a drying oven, and then calcining in a muffle furnace at the temperature of 450-650 DEG C, thus obtaining the lanthanum-supported composite oxide solid catalyst. The prepared catalyst consists of titanium dioxide, zirconium dioxide and lanthanum, and the supporting capacity of the lanthanum is controlled between 0.1% and 10%. The composite oxide solid catalyst is stable in chemical property, strong in catalysis capability and recyclable. Under the action of the composite oxide solid catalyst, a technology of converting xylose to furfural is high in reaction efficiency, moderate in reaction conditions and low in energy consumption in process; and the composite oxide solid catalyst is environment-friendly and capable of achieving the aim of saving energy and reducing emission.

Description

technical field [0001] The invention relates to a catalyst for furfural synthesis, in particular to a complex oxide solid catalyst supported by rare earth metal lanthanum and a preparation method thereof. The catalyst can be used to catalyze xylose into furfural under normal pressure. Background technique [0002] Furfural is a derivative in which the hydrogen atom at the 2-position of furan is replaced by an aldehyde group, also known as 2-furyl aldehyde, and its molecular formula is C 5 h 4 o 2 . Furfural is the most important derivative of the furan ring system and is an important product obtained from agricultural by-products. Furfural is obtained from corn cobs, an agricultural by-product, hydrolyzed with 10% sulfuric acid at high temperature, and the polypentose contained in it is cracked and dehydrated. There are many kinds of raw materials for furfural production, mainly those rich in pentosan, such as: corncobs, sawdust, rapeseed shells, bagasse, wheat straw, ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C07D307/48
CPCY02P20/10
Inventor 任俊莉李慧玲王文菊孙润仓
Owner SOUTH CHINA UNIV OF TECH
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