Bromomethane prepared by bromine oxidation of methane and catalyst for conversing the bromomethane into hydrocarbon

A catalyst, bromine oxidation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problem of catalyst instability, high price, high single-pass conversion rate of methane 13.3% and other issues

Active Publication Date: 2008-10-15
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, a metal oxyhalide is used as a catalyst without a carrier, the catalyst is unstable, and the metals used are mainly rare earth metals, the price is relatively high, and the single-pass conversion rate of methane is only up to 13.3%.

Method used

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  • Bromomethane prepared by bromine oxidation of methane and catalyst for conversing the bromomethane into hydrocarbon
  • Bromomethane prepared by bromine oxidation of methane and catalyst for conversing the bromomethane into hydrocarbon
  • Bromomethane prepared by bromine oxidation of methane and catalyst for conversing the bromomethane into hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Preparation of catalyst:

[0025] Weigh 6.300g of oxalic acid solid and dissolve it in 100mL of deionized water to obtain solution A, and weigh the corresponding RhCl with 0.40% Rh metal content 3 ·NH 2 0.10224 g of O was dissolved in 50 mL of deionized water to obtain solution B, and 34.5831 g of tetraethoxysilane liquid was weighed and added to solution A to form two mutually immiscible liquids. After sealing and stirring for 1 hour, the solution becomes a uniform, colorless and transparent one-phase solution. Add solution B and continue to stir for 0.5 hours, then put the mixed solution in an oven at 120°C to dry to a colloidal solid, and then set the colloidal solid Put it into the muffle furnace and heat it to 900°C at a heating rate of 200°C / h. Maintain the temperature for 10 hours and then cool down. After the temperature drops to room temperature, take out the catalyst, sieving to 20-60 mesh, and finally obtain 0.40% Rh / SiO 2 -900-10 catalyst ("0.40%" means the mass...

example 2 to example 6

[0031] Preparation of catalyst:

[0032] According to the preparation method of the catalyst in Example 1, different concentrations of RhCl were used 3 ·NH 2 O solution 50.0mL deionized water to obtain solution B, of which RhCl 3 ·NH 2 The concentration of O solution is the converted amount of the required load of different mass fractions of Rh. Finally get 0.10% Rh / SiO 2 -900-10 (Example 2), 0.20% Rh / SiO 2 -900-10 (Example 3), 0.30% Rh / SiO 2 -900-10 (Example 4), 0.50% Rh / SiO 2 -900-10 (Example 5), 0.60% Rh / SiO 2 -900-10 (Example 6) catalyst.

[0033] Catalyst test:

[0034] According to the test conditions of the catalyst in Example 1, the reaction was carried out under the same reaction conditions. The experimental results are listed in Table 1.

[0035] Table 1 Experimental results of Example 1 to Example 6 (Effect of metal Rh loading)

[0036]

[0037]

example 7 to example 12

[0039] Preparation of catalyst:

[0040] According to the preparation method of the catalyst in Example 1, different calcination temperatures and times were used in the muffle furnace. Finally, catalysts with different specific surface areas are obtained. That is 0.40%Rh / SiO 2 -900-6 (Example 7), 0.40% Rh / SiO 2 -900-2 (Example 8), 0.40% Rh / SiO 2 -800-6 (Example 9), 0.40% Rh / SiO 2 -800-2 (Example 10), 0.40% Rh / SiO 2 -700-10 (Example 11), 0.40% Rh / SiO 2 -700-6 (Example 12) catalyst.

[0041] Catalyst test:

[0042] According to the test method of the catalyst in Example 1, the reaction was carried out under the same reaction conditions. The experimental results are listed in Table 2.

[0043] Table 2 Experimental results of Example 1, Example 7 to Example 12 (the influence of the calcination temperature during the preparation of the catalyst, the catalyst composition is 0.40% Rh / SiO 2 )

[0044]

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PUM

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Abstract

The invention discloses a catalyst which is used when methane is transformed into hydrobromic ether through the bromine oxidation reaction, and the catalyst which is used when preparing heavy hydrocarbons by using the hydrobromic ether further, and belongs to the technology field of the catalyst and the preparation method thereof. The first type of catalyst which is used when the methane is transformed into the hydrobromic ether through the bromine oxidation reaction comprises the preparation step that water-soluble metallic compound precursors such as Rh, Ru, Cu, Zn, Ag, Ce, V, W, Cd, Mo, Mn, Cr, La, etc. are mixed with a silica precursor, the mixture is processed through hydrolyzation, drying and roasting, and then the catalyst is obtained; the first type of catalyst can lead definite masses of reactant composed of the methane, HBr, H2O and oxygen sources (that is O2, air or oxygen-enriched air) to perform the catalytic bromine oxidation reaction, to generate target products such as CH3Br, CH2Br2, etc. The second type of catalyst, which is used when preparing the heavy hydrocarbons by using the hydrobromic ether further, includes the preparation step that molecular sieves such as HZSM-5, HY, H Beta, 3A, 4A, 5A, 13X, etc. load metallic compounds composed of Zn and Mg, so that the catalyst is obtained; the second type of catalyst can lead the methane bromination products composed of the CH3Br and the CH2Br2 to further react so as to generate the heavy hydrocarbons containing C3 to C13 and HBr, wherein, the HBr is used as a circular reaction medium.

Description

Technical field [0001] The invention discloses a catalyst for catalytically converting methane in natural gas into brominated alkanes, a catalyst for further converting brominated alkanes such as methyl bromide into high-carbon hydrocarbons, and a preparation method and application of the catalyst. It belongs to the technical field of catalysts and preparation methods thereof. It is an extension and extension of the catalyst part of the Chinese patents with application numbers 200410022850.8, 200510031734.7 and 200610031377.9, involving further research results. Background technique [0002] With the decreasing of petroleum resources, the conversion of natural gas into high value-added chemicals has received more and more attention. It has been proven that there are abundant natural gas reserves on the earth, and my country’s natural gas reserves are as high as 124 trillion m 3 , Accounting for the 22nd place in the world’s natural gas reserves, and new natural gas fields are con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/40B01J23/755B01J29/06B01J29/40C07C19/075C07C17/154C07C1/26
CPCB01J29/405B01J21/08B01J23/40B01J23/462B01J23/464B01J23/56B01J23/60B01J23/63B01J23/6482B01J23/652B01J23/6562B01J23/89B01J29/061B01J29/087B01J29/7053B01J29/7057B01J37/033C07C1/30C07C17/154C07C19/14C07C19/075
Inventor 刘振张洪敏李文生任艳群周小平
Owner MICROVAST POWER SYST CO LTD
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