CO hydrogenation synthesizing reaction metallic carbide catalyst and preparation and application

A metal carbide and bimetallic carbide technology, applied in the field of metal carbide catalysts, can solve the problems of low activity and poor selectivity of higher alcohols, and achieve high C2+OH selectivity, lower production costs, and excellent sulfur resistance. Effect

Inactive Publication Date: 2008-09-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention mainly aims at the shortcomings such as the current low-carbon mixed alcohol catalyst activity is low, higher alcohol selectivity is poor, provides a kind of catalyst with high activity and C 2 + Catalyst with high alcohol selectivity and its preparation method and application

Method used

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  • CO hydrogenation synthesizing reaction metallic carbide catalyst and preparation and application

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Embodiment 1

[0031] Ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 .24H 2 O) 10.0g was calcined at 450°C in air for 4 hours, and the obtained MoO 3 Grind it into a powder smaller than 0.3 mm, put it into a quartz reactor, use methane:hydrogen gas with a volume ratio of 1:4 as the carbonization medium, and feed 1.0 g of precursor into the reactor at a flow rate of 30 mL / min. Two-stage temperature program control is adopted, the temperature rise rate is 5°C / min from room temperature to 400°C, and the temperature rise rate is 1°C / min from 400°C to the final temperature of 650°C. Concentration of 0.5% O 2 / N 2 Mixed gas passivation for 3 hours to get molybdenum carbide. Alkali metal modification using K 2 CO 3 is the K source, K 2 CO 3 The molar ratio of molybdenum carbide to molybdenum carbide is 0.2, the K source is introduced by equal volume impregnation method, and then roasted in an inert atmosphere Ar at 600 ° C for 2 hours and then lowered to room temperature, using O with an oxygen...

Embodiment 2

[0033] Ammonium tungstate ((NH 4 ) 6 W 7 o 24 .24H 2 O) 17.9g was roasted at 550°C in air for 3 hours, and the resulting WO 3 Grind it into a powder less than 0.3 mm, put it into a quartz reactor, use a mixed gas with a volume ratio of ethylene:hydrogen of 1:6 as the carbonization medium, and feed 1.0 g of precursor into the reactor at a flow rate of 50 mL / min. Two-stage temperature program control is adopted, the temperature rise rate is 10°C / min from room temperature to 400°C, and the temperature rise rate is 1.5°C / min from 400°C to the final temperature of 750°C. 2 rapidly cooled to room temperature, and then the oxygen concentration was 1.0% O 2 / N 2 Mixed gas passivation for 5 hours to obtain tungsten carbide. Alkali metal modification uses NaOH as the Na source, the molar ratio of NaOH to tungsten carbide is 0.5, the Na source is introduced by the equal volume impregnation method, and then in an inert atmosphere N 2 After roasting at 500 ° C for 3 hours, it was l...

Embodiment 3

[0035] Ammonium chromate ((NH 4 ) 2 CrO 4 )8.5g was roasted in the air at 600°C for 2.5 hours, and the obtained CrO 3 Grind it into a powder less than 0.3 mm, put it into a quartz reactor, use a CO: hydrogen gas mixture with a volume ratio of 1:8 as the carbonization medium, and feed 1.0 g of precursor into the reactor at a flow rate of 80 mL / min. Two-stage temperature program control is adopted, the temperature rise rate is 15°C / min from room temperature to 400°C, and the temperature rise rate is 0.5°C / min from 400°C to the final temperature of 800°C. Concentration of 1.5% O 2 / He mixed gas passivation for 8 hours to get chromium carbide. Alkaline earth metal modification with Ca(CH 3 COO) 2 is the source of Ca, Ca(CH 3 COO) 2 The molar ratio to chromium carbide was 0.1, the Ca source was introduced by physical mixing method, and then calcined at 450 °C for 4 hours in an inert He atmosphere, and then lowered to room temperature, using O with an oxygen volume concentra...

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Abstract

The mol ratio of the components of a metallic carbide catalyst of CO hydrogenation synthetic reaction is that: alkali metals or alkaline earth metal compounds: VIA group carbides or double metal carbides is equal to 0.04 to 0.8:1.0. The double metal carbides are the carbides of the VIA group metals and transitional metals or the rare earth metals, wherein the mol ratio of transitional metals or the rare earth metals to the VIA group metals is equal to 0.1 to 1.0: 1. The metallic carbide catalyst has the advantages of high activity and high selectivity of C2<+>OH as well as reducing manufacture cost.

Description

technical field [0001] The invention belongs to a catalyst and its preparation method and application, in particular to a metal carbide catalyst for syngas to produce hydrocarbons, alcohol fuel or chemicals, its preparation method and application. Background technique [0002] With the increasing pressure on energy and environment, obtaining liquid fuels and bulk chemicals through non-petroleum routes has attracted worldwide attention. Low carbon mixed alcohol (C 1 -C 5 Mixed alcohol) has high octane number, anti-explosion, anti-shock and other properties, and its application has been positioned as an environmentally friendly fuel additive and oil substitute, and the production of low-carbon mixed alcohol from coal and natural gas through synthesis gas is a way to optimize the use of energy and efficient way to use resources. [0003] There have been a large number of reports on the synthesis of low-carbon mixed alcohols from CO hydrogenation, among which there are four r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C07C1/04C10L1/02
Inventor 孙予罕向明林李德宝李文怀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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