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A kind of preparation method of single-rh three-way catalyst and resulting product
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A technology of three-way catalyst and hydroxide, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of uniform size distribution, high particle dispersion, and good hydrothermal aging resistance
Active Publication Date: 2018-07-27
UNIV OF JINAN
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Currently, Rh / ZrO 2 The loading method adopted by the catalyst is the direct loading of precious metal rhodium to ZrO 2 However, there is no report of directly loading rhodium on the hydroxide of zirconium and then obtaining zirconium oxide by roasting
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Embodiment 1
[0047] Preparation of 0.3Rh / YZ catalyst
[0048] 1. Preparation of Y-Zr hydroxide solid solution
[0049] (1) Weigh 1.1490g Y(NO 3 ) 3 ·6H 2 O and 6.6810g Zr(NO 3 ) 4 ·3H 2 O, according to molar ratio 0.15:0.85, add 40mL ultrapure water to make a solution, stir;
[0050] (2) Measure 13.0mL of ammonia water, drop the above yttrium-zirconium salt solution into the ammonia water, the content of ammonia water is 25wt%;
[0051] (3) After the above salt solution is precipitated, continue to stir at room temperature for 4 hours, filter and wash with water until neutral, put the precipitate into a beaker with ethanol, seal and store it with stirring, and obtain the ethanol-protected Y-Zr hydroxide solid solution .
[0052] 2. Preparation of Rh Colloidal Nanoparticles
[0054] (2) Measure 15 mL of NaOH / EG solution in a four-neck flask and stir...
Embodiment 2
[0066] Catalyst is prepared according to the method for embodiment 1, difference is: when preparing Y-Zr hydroxide solid solution, Y(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·3H 2 The molar ratio of O is 0.1:0.9, and the obtained catalyst is recorded as 0.3Rh / YZ-1.
[0067] The obtained catalyst was subjected to aging treatment according to the method of Example 1, and the obtained aged catalyst was recorded as 0.3Rh / YZ-1-h.
[0068] The three-way performance test was carried out on the catalysts 0.3Rh / YZ-1 and 0.3Rh / YZ-1-h, and the results are shown in Table 2 below.
[0069]
Embodiment 3
[0071] Catalyst is prepared according to the method for embodiment 1, difference is: when preparing Y-Zr hydroxide solid solution, Y(NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·3H 2 The molar ratio of O is 0.3:0.7, and the obtained catalyst is recorded as 0.3Rh / YZ-2.
[0072] The obtained catalyst was subjected to aging treatment according to the method of Example 1, and the obtained aged catalyst was recorded as 0.3Rh / YZ-2-h.
[0073] The three-way performance test was carried out on catalysts 0.3Rh / YZ-2 and 0.3Rh / YZ-2-h, and the results are shown in Table 3 below.
[0074]
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Abstract
The invention discloses a preparing method of a single Rh three-way catalyst and the obtained product. The preparing method includes the steps that Rh colloid nano-particles are loaded on an yttrium zirconium hydroxide solid solution, and a rhodium / yttrium zirconium oxide solid solution, namely the single Rh three-way catalyst is obtained through roasting. Yttrium zirconium hydroxide is used as a carrier, and compared with the process of loading the particles on an yttrium zirconium oxide solid solution, the process of loading Rh on the Y-Zr hydroxide solid solution and carrying out roasting is probably beneficial for forming a new phase and active sites and promotes three-way activity. The obtained catalyst has good three-way catalytic activity and hydrothermal aging resistance under the condition of low precious metal Rh load, which is of great realistic significance in the practical automobile exhaust three-way catalyst industry.
Description
technical field [0001] The invention relates to a preparation method of a single Rh three-way catalyst and the obtained catalyst, and also relates to the application of the catalyst as a gasoline vehicle tail gas three-way catalyst, belonging to the technical field of gasoline vehicle tail gas catalytic purification. Background technique [0002] With the development of the automobile industry, the environmental pollution caused by automobile exhaust has attracted more and more attention. Gasoline vehicle exhaust mainly contains carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ), etc., the three-way catalyst can convert nitrogen oxides, carbon monoxide and hydrocarbons simultaneously, and is the mainstream technology for controlling automobile exhaust pollution. In the three-way catalytic technology, the catalyst is the core, mainly composed of three parts: carrier, auxiliary agent and active material. Among them, the active substances used for automobile ...
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