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Methanation catalyst and application thereof

A methanation catalyst and silicification technology, applied in the field of metal silicide catalysts, can solve the problems of Fe-based catalyst deactivation, poor methane selectivity, loss of active components, etc., and achieve high methane selectivity, strong sulfur resistance, and synthesis cost. low effect

Inactive Publication Date: 2012-01-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applied Catalysis B: Environmental 88(2009) 470-478 reported that Ru-based catalysts are relatively expensive compared to transition metal catalysts and are easily combined with CO to form Ru(CO) x Easy sublimation leads to the loss of active components; Journal of Catalysis 260 (2008) 254-261 reported that Fe-based catalysts are easily deactivated due to carbon deposition; Applied Catalysis A: General 289 (2005) 10-15 reported that Co-based catalysts have relatively Good stability, but poor selectivity to methane
Although Ni-based catalysts have high initial activity, there is carbon on the surface of the catalyst, the active components are sintered, and it is easy to combine with CO to form Ni(CO) 4 And loss, easy sulfur poisoning and other disadvantages

Method used

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  • Methanation catalyst and application thereof
  • Methanation catalyst and application thereof
  • Methanation catalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: 40% NiSi 2 / SiO 2 Catalyst preparation

[0019] Take 0.3g 40%NiO / SiO 2 placed in a quartz reactor. First pass Ar into it for purging, then switch to H 2 (30sccm), it is reduced at 450°C for 4h, and the resulting reduction product is in the same H 2 Cool to silicide temperature (250-450°C) under atmosphere to silicide it, and pass 10vol.% SiH into it 4 / H 2 Mixed gas for 15min, the total gas velocity is 100sccm, after the reaction is over, close the SiH 4 , at H 2 Cool to room temperature under the atmosphere, passivate it under the Ar atmosphere, that is, get 40% NiSi 2 / SiO 2 catalyst.

Embodiment 2

[0020] Example 2: 40% CoSi 2 / SiO 2 Catalyst preparation

[0021] Take 0.3g 40% Co 3 o 4 / SiO 2 placed in a quartz reactor. First pass Ar into it for purging, then switch to H 2 (30sccm), it is reduced at 450°C for 4h, and the resulting reduction product is in the same H 2 Cool to silicide temperature (250-450°C) under atmosphere to silicide it, and pass 10vol.% SiH into it 4 / H 2 Mixed gas for 15min, the total gas velocity is 100sccm, after the reaction is over, close the SiH 4 , at H 2 Cool to room temperature under the atmosphere, passivate it under the Ar atmosphere, that is, get 40% CoSi 2 / SiO 2 catalyst.

Embodiment 3

[0022] Example 3: 20% FeSi 2 / SiO 2 Catalyst preparation

[0023] Take 0.3g 20% ​​Fe 2 o 3 / SiO 2 placed in a quartz reactor. First pass Ar into it for purging, then switch to H 2 (30sccm), it was reduced at 500°C for 4h, and the resulting reduction product was 2 Cool to silicide temperature (350-550°C) under atmosphere to silicide it, and pass 10vol.% SiH into it 4 / H 2 Mixed gas for 15min, the total gas velocity is 100sccm, after the reaction is finished, close the SiH4 , at H 2 Cool to room temperature under the atmosphere, passivate it under the Ar atmosphere, that is, get 20% FeSi 2 / SiO 2 catalyst.

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Abstract

The invention which belongs to the technical field of coal processing utilization and coal conversion relates to a highly efficient and stable metal silicide catalyst of for the preparation of methane through carrying out coal-formed gas methanation. The stable metal silicide catalyst is formed through reducing a uniformly dispersed supported metal which is adopted as a precursor in hydrogen, siliconizing a mixed gas SiH4 / H2 at a low temperature and normal pressure. The preparative metal silicide catalyst has a high activity and a methane selectivity to CO methanation; and in addition, compared with traditional metal catalysts, the metal silicide catalyst of the invention has the advantages of high thermostability, high anti-sintering, high carbon deposition resistance, difficult loss of carbonyl compounds formed from active components, strong sulfur resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of coal processing and utilization and coal conversion, and relates to a highly efficient and stable metal silicide catalyst for obtaining methane through methanation of coal-based synthesis gas. Specifically, uniformly dispersed supported metals were used as precursors for reduction in hydrogen, followed by SiH at low temperature and normal pressure. 4 / H 2 Silicification of mixed gas, that is, the formation of stable metal silicide catalysts and the catalytic application of syngas methanation of the prepared materials. Background technique [0002] With the shortage of petroleum resources, the clean conversion of coal resources to produce natural gas instead of petroleum resources has become a major research topic at present. The study found that the main process of coal gasification to produce natural gas is the methanation reaction of syngas under the action of catalyst. The reaction has the advantage...

Claims

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Application Information

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IPC IPC(8): C07C1/04B01J21/18C07C9/04B01J21/08
Inventor 梁长海陈霄李苗管婧超
Owner DALIAN UNIV OF TECH
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