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Application of rutile titanium oxide supported catalyst in carbon dioxide hydrogenation reaction

A supported catalyst, rutile-type technology, applied in the field of highly dispersed catalyst and its preparation and application, can solve the problems such as the inability to determine the maximization of precious metal utilization, the limitation of large-scale industrial production, the specification of metal dispersion, etc., and to improve the utilization of atoms. Efficiency, excellent reactivity, high stability effect

Pending Publication Date: 2020-04-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned patents show good carbon dioxide methanation performance under specific reaction conditions, there is no description of the dispersion of the metals, and it is impossible to determine whether the maximum utilization of precious metals has been achieved, and the preparation process is not universal. , which limits its large-scale industrial production

Method used

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  • Application of rutile titanium oxide supported catalyst in carbon dioxide hydrogenation reaction
  • Application of rutile titanium oxide supported catalyst in carbon dioxide hydrogenation reaction
  • Application of rutile titanium oxide supported catalyst in carbon dioxide hydrogenation reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: 1wt% Ru / r-TiO 2 Catalyst preparation

[0034] 31.25mL RuCl 3 Solution (Ru content is 0.32mg / mL) in a 100mL beaker, add 30mL ultrapure water, mix well, add 1g r-TiO 2 After 30 minutes, the mixed suspension was transferred to a 323K water bath, stirred until all the water was evaporated to dryness, and then the evaporated catalyst precursor was transferred to a 393K oven for drying. After grinding, 1wt% Ru / r- TiO 2 -fresh powder catalyst; put the above-prepared sample under a pure hydrogen atmosphere for 3h reduction at 773K to obtain 1wt% Ru / r-TiO 2 Powder catalyst, its XRD result sees figure 1 , the test results show that the noble metal Ru is highly dispersed on the surface of the catalyst or its nanoparticle size is smaller than the detection limit of XRD (3nm).

Embodiment 2-13

[0035] Embodiment 2-13: The preparation method is the same as that of Embodiment 1, and the specific conditions are shown in the table below.

[0036]

[0037]

Embodiment 14

[0038] Example 14: 1wt% Rh / r-TiO 2 Catalyst preparation

[0039] Compared with Example 1, the difference is that the added metal precursor solution is RhCl 3 solution. The specific steps are to take 10.20mL (Rh content is 0.98mg / mL) in a 100mL beaker, add 30mL ultrapure water, mix well and add 1gr-TiO 2 After 30 minutes, transfer the mixed suspension to a 323K water bath, stir until the water is completely evaporated, then transfer the evaporated catalyst precursor to a 393K oven for drying, and grind to obtain 1wt% Rh / r- TiO 2 -fresh powder catalyst. The above-prepared sample was placed in a pure hydrogen atmosphere at 773K for 3 hours to obtain 1wt% Rh / r-TiO 2 Powder catalyst, which is used for carbon dioxide conversion, in H 2 / CO 2 =4, GHSV=60000mL h -1 g cat -1 , the performance evaluation results are shown in Figure 8 , the test results show that the 1wt%Rh / r-TiO prepared by this method 2 With excellent catalytic performance, CH 4 The selectivity of >95%, t...

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Abstract

The invention relates to application of a rutile type titanium oxide supported high-dispersion catalyst. Specifically, the catalyst is a supported catalyst, the loading capacity of the active components Ru and Rh is 0.01-20 wt% of the total mass of the catalyst, and the carrier is rutile titanium oxide. When the catalyst is used for carbon dioxide conversion, especially carbon dioxide methanationreaction, within the temperature range of 473-673 K, carbon dioxide reverse-water-gas-shift side reaction can be effectively inhibited no matter whether reduction pretreatment is carried out or not, CH4 selectivity is higher than 99.99%, and the selectivity is not affected by the airspeed. The catalyst provided by the invention has the characteristics of simple preparation method, high selectivityand high stability, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and comprehensive utilization of carbon dioxide, and relates to a highly dispersed catalyst supported by rutile-type titanium oxide and its preparation and application. Background technique [0002] Since the Industrial Revolution, the demand for non-renewable resources has increased dramatically. At present, the use of fossil energy in the global energy demand has exceeded 85%. With the continuous consumption of fossil energy, the carbon dioxide emitted by human beings to the environment is increasing year by year. In 2013 alone, the carbon dioxide emitted into the atmosphere was as high as 32.19 billion tons, and Scientists predict that by 2040, the annual emission of carbon dioxide will reach 45 billion tons, which will bring a series of environmental problems, such as the greenhouse effect, acidification of sea water, etc., which will seriously damage the carbon balance in nature. Therefor...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/00B01J37/08B01J37/18C07C1/12C07C9/04
CPCC07C1/12B01J37/18B01J37/08B01J23/462C07C2523/46B01J35/394B01J35/396C07C9/04Y02P20/00
Inventor 王晓东李筱玉李林林坚乔波涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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