Core-shell iron-based catalyst for directly producing aromatic hydrocarbon from synthesis gas as well as preparation method and application of the core-shell iron-based catalyst

A core-shell iron-based, synthesis gas technology, applied in the preparation of liquid hydrocarbon mixtures, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low aromatics selectivity and yield, low CO utilization rate, and low selectivity , to achieve high aromatics selectivity, high CO conversion rate, particle size and stability

Active Publication Date: 2020-07-07
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the non-precious metal system, the purpose of the present invention is to provide a core-shell iron-based catalyst for the direct production of aromatics from synthesis gas and its preparation method and application. The coated nano-metal oxide particles are highly dispersed in the molecular sieve, with small and stable particle size, high CO conversion rate and high aromatics selectivity, and the aromatics products are concentrated, and the by-products CO2 and CH Low selectivity of 4 solves the problem of low selectivity and yield of aromatics in the reaction process of hydrogenation of carbon monoxide to directly prepare aromatics in the prior art, and the by-products CO2 and CH4High selectivity and low CO utilization

Method used

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  • Core-shell iron-based catalyst for directly producing aromatic hydrocarbon from synthesis gas as well as preparation method and application of the core-shell iron-based catalyst
  • Core-shell iron-based catalyst for directly producing aromatic hydrocarbon from synthesis gas as well as preparation method and application of the core-shell iron-based catalyst

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Catalyst preparation:

[0037] ①Preparation of nanometer Fe with uniform size by hydrothermal synthesis 3 O 4 Granules: The molar ratio of ferric chloride, sodium acetate, ethylene glycol, ethylenediamine and polyvinylpyrrolidone (PVP10, average molecular weight 58000) is: 1:2.9:32:4:0.8, and stirred at 40°C To completely dissolve, the obtained mixed solution was transferred to a hydrothermal kettle, sealed and hydrothermally reacted at 200°C for 12 hours, and washed with deionized water and absolute ethanol after being cooled to room temperature. The separated solid was vacuumed at 60°C. Dry overnight to obtain nano-Fe with uniform size 3 O 4 Particles.

[0038] ②Using organosilane agent for nano-Fe 3 O 4 Pre-modification of particle surface: take the nano-Fe obtained in step ① 3 O 4 The particles were dispersed in a mixed solution of ethanol and deionized water and treated with ultrasound for 30 minutes. The volume ratio of ethanol to deionized water in the mixed solut...

Embodiment 2

[0045] The preparation of the catalyst is the same as in Example 1, the difference is that the gas volumetric space velocity of the feed gas in the carbon monoxide hydrogenation reaction in the application of the catalyst is adjusted to 6000h -1 , The remaining steps are the same as in Example 1.

Embodiment 3

[0047] The preparation of the catalyst is the same as in Example 1, the difference is that the gas volumetric space velocity of the feed gas in the carbon monoxide hydrogenation reaction in the application of the catalyst is adjusted to 9000h -1 , The remaining steps are the same as in Example 1.

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Abstract

The invention discloses a core-shell iron-based catalyst for directly producing aromatic hydrocarbon from synthesis gas. According to the catalyst, a nano ZSM-5 molecular sieve with the silica-aluminaratio of 30-200 is used as a shell layer, and surface pre-modified nano metal oxide particles are used as a core; the particle size of the nano metal oxide is 1-3 nm, the nano metal oxide is uniformly distributed, and the content of metal elements is 0.1-7% wt; wherein the aromatic hydrocarbon is C7-C11 aromatic hydrocarbon. The catalyst provided by the invention has high CO conversion rate and high aromatic hydrocarbon selectivity; the CO conversion rate can reach 42.6%; the selectivity of aromatic hydrocarbons in total hydrocarbons reaches 47.6%; the content in an oil phase reaches 78.1%; in addition, aromatic hydrocarbon products are concentrated, the selectivity of by-products CO2 and CH4 is low, the CO2 selectivity is only about 18.9%, the CH4 selectivity is only about 14.0%; the problems that the aromatic hydrocarbon selectivity and yield are low, the selectivity of by-products CO2 and CH4 is high, and the CO utilization rate is low are solved.

Description

Technical field: [0001] The invention relates to the technical field of catalysts, in particular to a core-shell iron-based catalyst used for the direct production of aromatics from syngas, and a preparation method and application thereof. Background technique: [0002] Convert coal, natural gas and biomass into syngas (CO and H 2 The composition of the mixed gas), and then through the Fischer-Tropsch synthesis reaction in iron-based, cobalt-based catalysts and under appropriate conditions, low-carbon olefins, liquid fuels, lubricating oil, and high-quality solid waxes can be produced without sulfur, nitrogen and aromatic hydrocarbons. Compound. It not only meets the increasingly stringent environmental requirements and alleviates the environmental problems in the process of coal utilization, but also expands the sources of fuel oil and provides an important alternative to petroleum resources. Among them, aromatic compounds are important intermediate platform molecules for the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46C10G2/00
CPCB01J29/46C10G2/334B01J2229/18Y02P20/52
Inventor 王晨光文承彦马隆龙刘琪英张兴华陈伦刚
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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