HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization and preparation method thereof

A bimetallic catalyst, hydrogenation depolymerization technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc. stable effect

Active Publication Date: 2019-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of biomass high-value applications, although metal-supported modified ZSM-5 molecular sieves are widely used as carrier catalysts, their applications in the field of lignin hydrogenation depolymerization to prepare monobenzene ring phenols are very rare

Method used

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  • HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization and preparation method thereof
  • HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization and preparation method thereof
  • HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization and preparation method thereof

Examples

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Effect test

Embodiment 1

[0045] A HZSM-5 supported bimetallic catalyst, in which the mass percent content of Fe in the catalyst is 3%, the mass percent content of Pd is 0.5%, and the carrier is HZSM-5.

[0046] Among them, the carrier HZSM-5 is obtained by high-temperature deamination of ZSM-5, and has obvious acid sites and porous structure.

[0047] Using ferric sulfate heptahydrate and palladium nitrate dihydrate as raw materials, the HZSM-5 supported Fe-Pd bimetallic catalyst was prepared through impregnation, roasting and reduction, specifically including the following steps, in molar volume parts, mmol / mL:

[0048] First, add iron source and palladium source into dilute hydrochloric acid according to the molar ratio of 5.886:0.519, stir at room temperature at a speed of 300r / min for 2min to fully mix iron source and palladium source, wherein the volume ratio of iron source to dilute hydrochloric acid It is 5.886 mole parts: 100 volume parts. Add 12 mass parts of HZSM-5 molecular sieves to the a...

Embodiment 2

[0050] A HZSM-5 supported bimetallic catalyst, in which the mass percent content of Fe in the catalyst is 9%, the mass percent content of Pd is 2%, and the carrier is HZSM-5.

[0051] Among them, the carrier HZSM-5 is obtained by high-temperature deamination of ZSM-5, and has obvious acid sites and porous structure.

[0052] Using ferric chloride hexahydrate and palladium acetate as raw materials, the HZSM-5 supported Fe-Pd bimetallic catalyst was prepared through impregnation, roasting and reduction, specifically including the following steps, in molar volume parts, mmol / mL:

[0053] First, the iron source and the palladium source are added into the dilute hydrochloric acid according to the molar ratio of 17.661:2.064, and stirred at a speed of 400r / min for 4 minutes at room temperature to fully mix the iron source and the palladium source, wherein the ratio of the iron source to the dilute hydrochloric acid is 17.661 parts by mole: 100 parts by volume. Add 11 mass parts of ...

Embodiment 3

[0055] A HZSM-5 supported bimetallic catalyst, in which the mass percent content of Fe in the catalyst is 8.9%, the mass percent content of Pd is 0.8%, and the carrier is HZSM-5.

[0056] Among them, the carrier HZSM-5 is obtained by high-temperature deamination of ZSM-5, and has obvious acid sites and porous structure.

[0057] Using ferric nitrate nonahydrate and palladium chloride as raw materials, the HZSM-5 supported Fe-Pd bimetallic catalyst was prepared through impregnation, roasting and reduction, specifically including the following steps, in molar volume parts, mmol / mL:

[0058] First, add the iron source and palladium source into the dilute hydrochloric acid according to the molar ratio of 17.465:0.823, and stir at a speed of 350r / min for 3 minutes at room temperature to fully mix the iron source and palladium source, wherein the ratio of iron source and dilute hydrochloric acid is 17.465 Parts by mole: 100 parts by volume. Then add 10 parts by mass of HZSM-5 molec...

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Abstract

The invention belongs to the technical field of catalysts, and discloses a HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization and a preparation method thereof. The preparation method of the invention uses an iron source and a palladium source as raw materials, the materials are dispersed on the surface of a HZSM-5 molecular sieve by an impregnation method, andthe catalyst is prepared by high-temperature calcination and hydrogen reduction. The method of the invention simultaneously loads Fe and Pd onto a carrier to realize the reduction of elemental iron,the Fe promotes the high dispersion of Pd, and improves the catalytic efficiency and the catalytic selectivity; a molecular sieve HZSM-5 is used as the carrier to improve the dispersibility and activecatalytic sites of the active metal, and the catalytic activity can be improved, the obtained HZSM-5 supported Fe-Pd bimetallic catalyst for lignin hydrogenation and depolymerization is applied to catalytic hydrogenation and depolymerization of lignin, the conversion rate of lignin hydrogenolysis is 98.1wt%, the yield of bio-oil is 78.5 wt%, and the yield of a monophenol compound is as high as 27.9wt%.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a HZSM-5 loaded Fe-Pd bimetallic catalyst for lignin hydrogenation depolymerization and a preparation method thereof. Background technique [0002] The shortage of fossil resources and the aggravation of environmental pollution have prompted people to actively look for green and renewable energy and resources to meet the sustainable development needs of human society. Lignin, as the only renewable biomass resource containing aromatic compounds in nature, is considered to be an important raw material for the future production of liquid fuels and bio-based chemicals. However, due to the complex three-dimensional network structure and chemical inertness in lignin, the catalytic depolymerization of lignin to produce monophenolic compounds for liquid fuels and chemicals is still a bottleneck in the utilization of biomass resources. At present, in the methods of lignin d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44C10G3/00
CPCB01J29/44C10G3/49C10G3/50Y02P30/20
Inventor 欧阳新平谢娇阳邱学青杨东杰万泽辰
Owner SOUTH CHINA UNIV OF TECH
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