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Modified mesoporous molecular sieve supported platinum-based catalyst and preparation method thereof

A mesoporous molecular sieve and catalyst technology, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low utilization rate of aluminum atoms in modified molecular sieves, unfavorable catalytic depolymerization of lignin, and influence on catalyst pore structure and other problems, to achieve good catalytic effect, rich acid active sites, and high selectivity

Active Publication Date: 2019-11-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned modified molecular sieve prepared by the one-pot method has a low utilization rate of aluminum atoms, and is not conducive to the dispersion of subsequent supported metals.
The loading of alumina as the acid active center will cause blockage of molecular sieve channels, affecting the pore structure of the catalyst, which is not conducive to the catalytic depolymerization of lignin

Method used

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  • Modified mesoporous molecular sieve supported platinum-based catalyst and preparation method thereof
  • Modified mesoporous molecular sieve supported platinum-based catalyst and preparation method thereof
  • Modified mesoporous molecular sieve supported platinum-based catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Weigh 0.228 parts by mass of anhydrous aluminum chloride and 0.5 parts by mass of mesoporous molecular sieve SBA-15, add 50 parts by volume of absolute ethanol, and after ultrasonic dispersion for 30 minutes, stir for 12 hours to obtain a uniformly dispersed suspension;

[0047] (2) Use a large amount of absolute ethanol to wash and filter the suspension in step (1), take the white solid powder on the filter paper, and put it in a vacuum oven at 50°C for 24 hours;

[0048] (3) Transfer the dried solid powder into a tube furnace, raise the temperature to 350°C at a heating rate of 3.5K / min in a dry air atmosphere, and keep it for 6 hours to obtain a modified molecular sieve, which is named Al-SBA -15(5). Wherein (5) represents the silicon-aluminum ratio, specifically the quantitative ratio of silicon atoms and aluminum atoms in the modified molecular sieve, i.e. Si:Al=5:1, the same hereinafter;

[0049] (4) Configure 4mg / mL (platinum mass concentration) chloroplatin...

Embodiment 2

[0053] (1) Weigh 0.114 parts by mass of anhydrous aluminum chloride, 0.5 parts by mass of mesoporous molecular sieve SBA-15, add 50 parts by volume of absolute ethanol, ultrasonically disperse for 30 minutes, stir for 24 hours, and obtain a uniformly dispersed suspension;

[0054] (2) Use a large amount of absolute ethanol to wash and filter the suspension in step (1), take the white solid powder on the filter paper, and put it in a vacuum oven at 50°C for 24 hours;

[0055] (3) Transfer the dried solid powder into a tube furnace, raise the temperature to 550°C at a heating rate of 4.5K / min in a dry air atmosphere, and keep it for 5 hours to obtain a modified molecular sieve Al-SBA-15(10) ;

[0056] (4) Configure 4mg / mL (platinum mass concentration) chloroplatinic acid solution, weigh 0.2 parts by mass of modified molecular sieve Al-SBA-15(10), and add 2 parts by volume of 4mg / mL chloroplatinic acid dropwise to the molecular sieve Solution and a small amount of hydrochloric a...

Embodiment 3

[0065] (1) Weigh 0.057 parts by mass of anhydrous aluminum chloride and 0.5 parts by mass of mesoporous molecular sieve SBA-15, add 50 parts by volume of absolute ethanol, ultrasonically disperse for 30 minutes, and stir for 24 hours to obtain a uniformly dispersed suspension;

[0066] (2) Rinse and filter the suspension in step (1) with a large amount of absolute ethanol, take the white solid powder on the filter paper, and dry it in a vacuum oven at 50°C for 24 hours;

[0067] (3) Transfer the dried solid powder into a tube furnace, raise the temperature to 450°C at a heating rate of 4.5K / min in a dry air atmosphere, and keep it for 4 hours to obtain a modified molecular sieve Al-SBA-15(20) ;

[0068] (4) Configure 5 mg / mL (platinum mass concentration) potassium chloroplatinate solution, weigh 0.2 parts by mass of modified molecular sieve Al-SBA-15(20), and add 2 parts by volume of 5 mg / mL platinum chloride dropwise to the molecular sieve acid solution and a small amount of...

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Abstract

The invention belongs to the technical field of solid catalysts, and discloses a modified mesoporous molecular sieve supported platinum-based catalyst for hydrogenation and depolymerization of ligninand a preparation method thereof. The preparation method comprises the steps that pure silicon mesoporous molecular sieve SBA-15 is used as a carrier, aluminum doping modification is performed by a post-synthesis method, then water-soluble platinum salt is used as a platinum source, platinum is loaded by an impregnation method, and the modified mesoporous molecular sieve supported platinum-based catalyst is obtained. The catalyst is of a regular two-dimensional hexagonal pore structure and has rich acid active sites, the loaded platinum nanoparticles are small (2-5 nm), the pore diameter is large (6-9 nm), the specific surface area is large (400-600 m<2> / g), the dispersion is uniform, the stability is good, excellent catalytic performance in the reaction of lignin hydrogenolysis for preparation of aromatic monomer compounds is achieved, the bio-oil yield can reach 83.33%, the yield of aromatic monomer can reach 25.79%, and the selectivity to products is higher, especially for propyl guaiacol.

Description

technical field [0001] The invention belongs to the technical field of solid catalysts, in particular to a modified mesoporous molecular sieve-supported platinum-based catalyst for lignin hydrogenation depolymerization and a preparation method thereof. Background technique [0002] At present, the consumption of energy, fuels and chemicals mainly depends on fossil energy, but the non-renewable fossil energy and the environmental pollution caused by it need to be solved urgently. Low-pollution renewable biomass resources, especially lignocellulose, can replace fossil energy Potential for the production of energy fuels and chemicals. Lignin is the only natural polymer compound that can provide benzene rings in nature. It is composed of three phenylpropane structural units bonded randomly through carbon-carbon and carbon-oxygen bonds. Through some chemical methods, lignin macromolecules are transformed into aromatic units. The bulk structure is an important step to realize the...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J35/02C07C41/01C07C43/23C10G1/06
CPCB01J29/0325C10G1/06C07C41/01B01J2229/18B01J35/40C07C43/23
Inventor 欧阳新平万泽辰邱学青郭岳饶睿恒
Owner SOUTH CHINA UNIV OF TECH
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