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Preparation and application of dual-function catalyst Pt/Ce0.95Al0.05Ox/La2O3-Al2O3

A dual-function catalyst, catalyst technology, applied in catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of metal carbonization, reducing heat exchange efficiency, and hindering the normal flow of fluids, etc.

Inactive Publication Date: 2016-08-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These deposits will increase the resistance between the tube wall and the fluid, reducing the heat exchange efficiency; metal carburization is prone to occur, reducing the mechanical properties, corrosion resistance and oxidation resistance of metal materials; hindering the normal flow of fluid and blocking the fuel pipeline , nozzles, precision valves to stop the engine

Method used

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  • Preparation and application of dual-function catalyst Pt/Ce0.95Al0.05Ox/La2O3-Al2O3
  • Preparation and application of dual-function catalyst Pt/Ce0.95Al0.05Ox/La2O3-Al2O3
  • Preparation and application of dual-function catalyst Pt/Ce0.95Al0.05Ox/La2O3-Al2O3

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preparation example Construction

[0042] The invention provides bifunctional catalyst Pt / Ce 0.95 Al 0.05 o x / La 2 o 3 -Al 2 o 3 The preparation method, its preparation steps are as follows:

[0043] (1) Ce 0.95 Al 0.05 o x Preparation of composite oxides

[0044] The precursors of cerium and aluminum respectively weighed Ce(NO 3 ) 3 ·6H 2 O and Al(NO 3 ) 3 9H 2 O, and dissolved in deionized water to prepare a certain proportion of mixed salt solution;

[0045] Stir quickly with a stirrer for 30 minutes to make it evenly mixed;

[0046] Precipitate under stirring conditions and control the pH;

[0047] After the precipitate is formed, continue to stir for 30 minutes and then stand and age for 2 days, then filter and wash the precipitate with deionized water until the filtrate is neutral;

[0048] The precipitate was dried at 120°C for 1 day, and then calcined with oxygen at 600°C for 3 hours in a muffle furnace to obtain the desired Ce 0.95 Al 0.05 o x composite oxides;

[0049] (3)La 2 ...

Embodiment 1

[0069] According to two kinds of catalyst powder Pt / Ce 0.95 Al 0.05 o x with Pt / La 2 o 3 -Al 2 o 3 , and mechanically mixed at a mass ratio of 1:1 to obtain Pt / Ce 0.95 Al 0.05 o x / La 2 o 3 -Al 2 o 3 catalyst. According to the method, the loading amount of the fixed catalyst is 0.2g±0.02 / 800mm, and the three catalysts are coated on the inner wall of the stainless steel tube to make a corresponding tubular coating catalyst.

[0070] In order to compare the cracking effect of the catalyst of the present invention, the cracking of RP-3 under supercritical conditions was used as a probe reaction, and its cracking activity was evaluated and compared on a kerosene cracking device built by the laboratory itself. The activity test conditions of this embodiment are as follows: two-stage heating is adopted, the preheating section of the reaction tube is 250 mm long, controlled at 250° C., the reaction section is 300 mm long, and the temperature is set at 650° C.

[0071] T...

Embodiment 2

[0075] According to two kinds of catalyst powder Pt / Ce 0.95 Al 0.05 o x with Pt / La 2 o 3 -Al 2 o 3 , and then mechanically mix the two catalyst powders according to the mass ratio of 1:1 to obtain the Pt / Ce 0.95 Al 0.05 o x / La 2 o 3 -Al 2 o 3 Catalyst, which is divided into 5 parts, and different additives are added as shown in the table below to obtain five groups of Pt / Ce modified with different additives 0.95 Al 0.05 o x / La 2 o 3 -Al 2 o 3 Catalyst powder. These five groups of catalyzers are coated on the stainless steel pipe by the method described (the control catalyst slurry solid content is 30%, and the load is 0.2 ± 0.02g / 800mm), and this 1#-5# catalyzer is recorded as Cat1-Cat5.

[0076] Table 3 Additives and their addition amount

[0077]

[0078] The method described in Example 1 was used to evaluate the influence of additives on the cracking activity of the catalyst. The test results are shown in Table 4: the addition of the catalyst sign...

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Abstract

The invention provides a Pt / Ce 0.95 Al 0.05 o x / La 2 o 3 ‑Al 2 o 3 The preparation method and application of the quasi-bifunctional catalyst are modified by adding additives, and the modified species include alkali metal oxides, alkaline earth metal oxides and rare earth metal oxides. The alkali metal oxides, alkaline earth metal oxides and rare earth metal oxide additives added in the catalyst of the present invention have the effect of inhibiting the formation of carbon deposits, which can effectively prevent the contact between the catalyst and the metal (stainless steel), reduce metal catalytic coking, It can also effectively reduce the impact of additives on oil, and can also change the path of cracking reaction through coking inhibitors, reduce the number of free radical coke, and make the cracking reaction proceed as far as possible to produce small molecule olefins with better combustion performance.

Description

technical field [0001] The invention relates to the technical field of catalyst research and application, in particular to the bifunctional catalyst Pt / Ce 0.95 Al 0.05 o x / La 2 o 3 -Al 2 o 3 preparation and its application. Background technique [0002] The endothermic cracking of hydrocarbon fuels to generate small molecule olefins is considered to be the main way of active engine cooling, but solid deposits are inevitably formed during this process. These deposits will increase the resistance between the tube wall and the fluid, reducing the heat exchange efficiency; metal carburization is prone to occur, reducing the mechanical properties, corrosion resistance and oxidation resistance of metal materials; hindering the normal flow of fluid and blocking the fuel pipeline , nozzles, and precision valves to stop the engine. The formation mechanism of deposits is very complex. Fuel undergoes different reactions in different temperature ranges, and the mechanism of dep...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/02C10G11/04
CPCB01J23/63B01J23/002B01J23/10B01J37/0217B01J37/0219B01J37/0225B01J2523/00C10G11/04C10G2300/70B01J2523/3712B01J2523/31B01J2523/3706
Inventor 王健礼李象远李珊珊朱权陈耀强
Owner SICHUAN UNIV
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