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A kind of au-tio 2-x Catalysts and their applications

An au-tio2-x, catalyst technology, applied in physical/chemical process catalysts, catalyst carriers, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor TiO2 carrier effect and low WGS activity of catalysts , weak interaction of active metals, etc., to achieve the effect of improving the thermal current transmission efficiency, reducing the ohmic energy barrier, and promoting the reduction reaction

Active Publication Date: 2019-10-29
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, traditional TiO 2 The surface defects of the carrier are less, resulting in weaker interaction with the active metal, so the traditional Au-TiO 2 Catalyst WGS activity is not high
Researchers usually dope traditional TiO by metal or non-metal 2 The carrier is modified, but the amount of these dopants added is limited after all, resulting in the modification of TiO 2 Carriers don't work well

Method used

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  • A kind of au-tio <sub>2-x</sub> Catalysts and their applications
  • A kind of au-tio <sub>2-x</sub> Catalysts and their applications
  • A kind of au-tio <sub>2-x</sub> Catalysts and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1 Au-TiO 2 -A and Au-TiO 2-x -Preparation of catalyst

[0065] 1. TiO 2 -A and TiO 2-x - Preparation of A carrier

[0066] (1) Add 4.65g of glacial acetic acid and 120mL of distilled water into a 500mL round bottom flask, then slowly add 20mL of tetra-n-butyl titanate, and stir vigorously at 80°C for 8 hours;

[0067] (2) Transfer the mixture in the round bottom flask to a 120mL polytetrafluoroethylene-lined autoclave, and keep it in an electric oven at 180°C for 24 hours to obtain a precipitate;

[0068] (3) The precipitate was washed with deionized water until the pH of the supernatant was neutral, and dried at 100 °C for 12 hours to obtain solid TiO 2 ;

[0069] (4) the solid TiO 2 Calcined at 550 °C for 4 hours in air atmosphere to obtain white anatase TiO 2 (TiO 2 -A); or solid TiO 2 in H 2 Calcined at 550°C for 4 hours in the atmosphere to obtain black anatase TiO 2 (TiO 2-x -A).

[0070] 2. Au-TiO 2 -A and Au-TiO 2-x -Preparation of cataly...

Embodiment 2

[0073] Example 2 Au-TiO 2 -N and Au-TiO 2-x Preparation of -N catalyst

[0074] 1. TiO 2 -N and TiO 2-x Preparation of -N carrier

[0075] (1) Add 6g of tetra-n-butyl titanate into 18mL of distilled water, and continue to stir for 30min after ultrasonication for 30min; add another 17g of NaOH into 21mL of distilled water, and stir evenly;

[0076] (2) After mixing the two, ultrasonicate for 15 minutes, and continue to stir until milky, then add it to a 50mL polytetrafluoroethylene-lined autoclave, and place it in an electric oven at 200°C for 48 hours to obtain sodium titanate (Na 2 Ti 3 o 7 ) nanoribbons;

[0077] (3) After the reaction, wash the sodium titanate (Na titanate) with distilled water 2 Ti 3 o 7 ) nanoribbons, at 0.1M HNO 3 acidified overnight in medium and dried at room temperature to give the acidified titanate (H 2 Ti 3 o 7 );

[0078] (4) the acidified titanate (H 2 Ti 3 o 7 ) was calcined at 550°C for 4 hours in an air atmosphere to obtain ...

Embodiment 3

[0082] Example 3 Au-TiO 2 -C and Au-TiO 2-x Preparation of -C catalyst

[0083] Commercial TiO 2 (Shanghai Chemical Reagent Co., Ltd.) calcined in air at 550°C for 4 hours to obtain white TiO 2 -C; alternatively, the commercial TiO 2 (Shanghai Chemical Reagent Co., Ltd.) at 550°C in H 2 Calcined in the atmosphere for 4 hours to obtain gray TiO 2-x -C.

[0084] Au-TiO 2-x The preparation method of the -C catalyst is the same as that of the catalyst in Example 1.

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Abstract

The invention discloses a Au-Ti(2-x) catalyst and application thereof. The Au-Ti(2-x) catalyst comprises a carrier and an active component, wherein the carrier is obtained through forging anatase-phase TiO2 nano-particles or TiO2 nano-belts under a hydrogen atmosphere. According to the Au-Ti(2-x) catalyst, the anatase-phase TiO2 nano-particles or TiO2 nano-belts are placed in the hydrogen atmosphere to be forged, compared with a TiO2 carrier obtained through forging under the conventional air atmosphere, the carrier provided by the invention has rich oxygen vacancy, Ti<3+> and defective bits, and a surface 'disordered layer' is formed, so that Ohm energy barriers of the Au-Ti(2-x) catalyst are reduced, electron recombination is inhibited, the thermocurrent transmission efficiency is improved, reduction reaction of H2O is promoted, and the CO conversion rate in water gas shift reaction is improved.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to an Au-TiO 2-x Catalysts and their applications. Background technique [0002] Hydrogen energy is a clean, efficient and sustainable energy source, such as proton exchange membrane fuel cells (PEMFC). So far, hydrogen gas is mainly obtained by reforming crude oil, coal, natural gas, biomass, etc. However, the reformed gas obtained above contains about 1-10% by volume of CO, which will poison the Pt catalyst of the PEMFC anode. Therefore, in order to obtain pure hydrogen, those skilled in the art will convert water gas Applied in fuel processors in fuel cells, because the shift reaction not only produces hydrogen but also removes CO. [0003] However, the commercial WGS catalysts used in the above reactions, such as Cu-Zn-Al, Fe-Cr and Co-Mo based catalysts, inevitably hinder their application due to the need for complex pretreatment procedures or poor stability. applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J32/00B01J21/06B01J37/08C01B3/58
CPCB01J21/063B01J23/52B01J37/08C01B3/583
Inventor 李雷宋利
Owner JIAXING UNIV
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