A kind of methanation catalyst and preparation method thereof

A methanation catalyst and catalyst technology, which can be used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of low conversion rate, achieve good carbon deposition resistance, and promote conversion effects.

Active Publication Date: 2017-03-15
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the coke oven gas methanation reaction process in the prior art, the catalyst first catalyzes CO and H 2 A reaction occurs, resulting in CO 2 The conversion rate is not high, providing a catalyst that can simultaneously catalyze CO and CO 2 with H 2 Catalysts that react to improve the selectivity of existing catalysts

Method used

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  • A kind of methanation catalyst and preparation method thereof
  • A kind of methanation catalyst and preparation method thereof
  • A kind of methanation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of magnesium aluminum spinel

[0026] (a) MgO and Al 2 o 3 Mix the ingredients evenly at a molar ratio of 1:1, ball mill, dry and shape to obtain a spinel sample;

[0027] (b) pre-calcining the spinel sample at 250°C for 1 hour, then raising the temperature to 650°C for 1 hour, and cooling to room temperature to obtain a magnesium aluminum spinel precursor;

[0028] (c) Mixing and stirring the magnesium aluminum spinel precursor with nitric acid solution for 2 hours, filtering and drying, and calcining the dried sample at 700° C. for 2 hours to obtain the magnesium aluminum spinel.

[0029] 2. Preparation of catalyst

[0030] (1) Add 0.5 parts by weight of HMS mesoporous molecular sieves to the ethanol solution, then add 30 parts by weight of magnesium aluminum spinel, stir evenly, and obtain the catalyst carrier;

[0031] (2) drying the catalyst carrier obtained in step (1) at 100°C, and then calcining at 480°C for 2h to obtain a carrier precursor; ...

Embodiment 2

[0035] 1. Preparation of magnesium aluminum spinel

[0036] (a) MgO and Al 2 o 3 Mix the ingredients evenly at a molar ratio of 10:1, ball mill, dry and shape to obtain a spinel sample;

[0037] (b) pre-calcining the spinel sample at 120°C for 1 hour, then raising the temperature to 300°C for 6 hours, and cooling to room temperature to obtain a magnesium aluminum spinel precursor;

[0038] (c) Mixing and stirring the magnesium aluminum spinel precursor with nitric acid solution for 3 hours, filtering and drying, and calcining the dried sample at 700° C. for 2 hours to obtain the magnesium aluminum spinel.

[0039] 2. Preparation of catalyst

[0040] (1) Add 10 parts by weight of MCM-41 mesoporous molecular sieve into the ethanol solution, then add 20 parts by weight of magnesium aluminum spinel, stir evenly, and obtain the catalyst carrier;

[0041] (2) drying the catalyst carrier obtained in step (1) at 100° C., and then calcining at 450° C. for 2 hours to obtain a carrie...

Embodiment 3

[0045] 1. Preparation of magnesium aluminum spinel

[0046] (a) MgO and Al 2 o 3 Mix the ingredients evenly at a molar ratio of 8:1, ball mill, dry and shape to obtain a spinel sample;

[0047] (b) pre-calcining the spinel sample at 200°C for 1 hour, then raising the temperature to 400°C for 8 hours, and cooling to room temperature to obtain a magnesium aluminum spinel precursor;

[0048] (c) Mixing and stirring the magnesium aluminum spinel precursor with nitric acid solution for 2 hours, filtering and drying, and calcining the dried sample at 700° C. for 2 hours to obtain the magnesium aluminum spinel.

[0049] 2. Preparation of mesoporous molecular sieves

[0050] S1, add P123 to the aqueous hydrochloric acid solution and stir evenly, then add n-BuOH under stirring, continue stirring for 1 hour, then drop TEOS dropwise at 20°C to form a mixed system, the moles of each material in the mixed system The ratio is, TEOS:P123:HCl:H 2 O:BuOH=0.1:0.01:0.1:50:0.5;

[0051] S2,...

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Abstract

The invention discloses a methanation catalyst which comprises a support and active components supported on the support, wherein the support is a mesoporous molecular sieve; and the active components comprise magnesia alumina spinel, NiO, La2O3 and CeO2 and also comprise one or more of Fe2O3, TiO2, SiO2, K2O, CaO, MoO3, MnO2 and ZrO2. The preparation method of the methanation catalyst comprises the following steps: impregnating the mesoporous molecular sieve into the magnesia alumina spinel, drying, roasting to obtain a support precursor, coprecipitating the other active components, and finally, roasting to obtain the required catalyst. The active components and magnesia alumina spinel are supported on the mesoporous molecular sieve, thereby enhancing the CO2 conversion rate in every stage of reaction in the multistage methanation reaction process of coke oven gas under the interactions between the magnesia alumina spinel and active components in combination with the synergistic actions of the mesoporous molecular sieve. More CO2 in the gas mixture in every stage of reactor is converted into CH4, thereby breaking the original reaction equilibrium and promoting the conversion of CO2.

Description

technical field [0001] The invention relates to a methanation catalyst and a preparation method thereof, and belongs to the technical field of hydrocarbon industry tail gas synthesis and substitution of natural gas. Background technique [0002] Coke oven gas, also known as coke oven gas, refers to a combustible gas produced while coke and tar products are produced after high-temperature dry distillation in a coke oven by using several kinds of bituminous coal to make coking coal. A by-product of the coking industry. Coke oven gas is a mixture whose main components are hydrogen (55%-60%) and methane (23%-27%), and also contains a small amount of carbon monoxide (5%-8%), unsaturated hydrocarbons above C2 (2% ~4%), carbon dioxide (1.5%~3%), oxygen (0.3%~0.8%)) and nitrogen (3%~7%), etc. Among them, hydrogen, methane, carbon monoxide, and unsaturated hydrocarbons above C2 are flammable components, and carbon dioxide and nitrogen are non-flammable components. [0003] With th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03C07C9/04C07C1/12C07C1/04
Inventor 崔永君周晓艳杨琰丁同利张倩高忠超顾爱萍
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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