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Visible-light response supported-type Ru catalyst

A supported catalyst, catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, organic chemistry, etc. Effect

Active Publication Date: 2015-12-30
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at conventional Ru-loaded catalysts that need to have better CO at higher temperatures. 2 Catalytic activity for methanation, but also problems such as catalyst sintering and methane selectivity reduction caused by high temperature reaction, the semiconductor oxide TiO with visible light excitation activity is selected (2-x) N x As a carrier to prepare Ru-supported catalysts, visible light is introduced during the reaction, thereby significantly improving its low-temperature catalytic CO 2 The performance of methanation reaction alleviates many problems caused by high temperature reaction and reduces energy consumption. At the same time, the preparation method of the catalyst is simple and easy, which is conducive to industrialization and application

Method used

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  • Visible-light response supported-type Ru catalyst
  • Visible-light response supported-type Ru catalyst
  • Visible-light response supported-type Ru catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0023] TiO (2-x) N x Catalyst preparation

[0024] TiO (2-x) N x Carrier: Dissolve 15 mL of tetra-n-butyl titanate in 50 mL of absolute ethanol and stir vigorously at a constant speed to obtain a light yellow transparent solution A. Then, weigh 8 g of urea and dissolve it in 100 mL of distilled water, and add 1 mol / L of HNO 3 The pH of the solution was adjusted to 3 to obtain B solution. Add solution A dropwise to solution B under vigorous stirring, and continue to react for 3 hours after the dropwise addition to completely hydrolyze tetra-n-butyl titanate to obtain a white milky solution. Finally, the hydrolyzate was dried in an oven at 80°C, calcined in a muffle furnace at 400°C for 3 hours, ground and sieved to obtain a yellow nitrogen-doped titania carrier with a nitrogen-doped content of 2.57wt% (measured by EA).

[0025] Next, the active component Ru was loaded: 0.5 g of nitrogen-doped titanium dioxide was dried in a vacuum oven at 60° C. for 2 h. Then, to the dri...

Embodiment 2

[0027] Catalyst Performance Evaluation

[0028] The prepared catalyst of embodiment 1 catalyzes CO 2 The performance evaluation of the methanation reaction was carried out on a normal pressure continuous flow reactor with a flat heater. About 0.23g of catalyst (particle size about 0.2~0.3mm (60~80 mesh)) is packed in a quartz flat plate reactor (length 30mm*width 15mm*height 1mm), and the rest of the space is filled with quartz sand of the same particle size. Use 12Vol%H before the reaction 2 Reduction at 220°C for 3 hours, after cooling down, switch to reaction gas for comparative test of low-temperature thermocatalytic dark reaction and light reaction, in which CO 2 and H 2 The contents of He are fixed at 0.6Vol% and 2.4Vol%, respectively, He gas is used as the balance supplementary gas, and the total flow rate of the reaction gas is about 60mL / min. The reaction temperature is regulated by a temperature program temperature controller, and the visible light source is fixe...

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Abstract

The invention discloses a visible-light response supported-type Ru catalyst and a preparation method and application thereof. The preparation method comprises the steps that Ru nano particles are loaded on a visible-light absorbed TiO(2-x)Nx semiconductor oxide carrier, and the supported-type Ru catalyst is prepared; then visible light is introduced into a thermal catalytic CO2 methanation reaction system, and H2 is used for conducting heating reduction again before a catalytic reaction is conducted. Compared with a conventional thermal catalytic reaction without the visible light, the visible light can significantly promote the property of the Ru supported-type thermal catalyst to catalyze a CO2 methanation reaction. By means of the optic-thermal coupling method, the use temperature of the catalyst is greatly decreased, the method is simple and easy to carry out, and application of CO2 methanation in industrial production is facilitated.

Description

technical field [0001] The invention belongs to catalytic CO 2 In the field of methanation reaction, it specifically relates to a kind of photothermal coupling effect to improve the low temperature of Ru supported catalyst to catalyze CO 2 Methods for Methanation Reaction Performance. Background technique [0002] With the progress of human civilization and the increasing degree of industrialization, CO in the atmosphere 2 Greenhouse effects such as global warming, glacier melting, and sea level rise caused by increasing concentrations are no longer new topics. Therefore, CO 2 Energy saving and emission reduction and fixed treatment will be a major global issue. In response to CO 2 Regarding the issue of the greenhouse effect brought about by environmental protection, in addition to reducing emissions through energy conservation and controlling emission increments, we should also increase CO 2 processing and utilization. At present, carbon dioxide treatment methods ar...

Claims

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Application Information

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IPC IPC(8): B01J23/46C07C9/04C07C1/12C10L3/08
Inventor 戴文新林柳柳陈旬付贤智王绪绪员汝胜丁正新
Owner FUZHOU UNIVERSITY
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