Novel three-way catalytic nano heavy rare earth oxygen storage material and preparation method thereof
An oxygen storage material, heavy rare earth technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of three-way catalytic purification, high temperature aging resistance, and emission reduction
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Embodiment 1
[0038] The experimental system of the ultrasonic membrane diffusion method is composed of a plunger pump, an ultrasonic generator, a mechanical stirring device, a glass reactor, a hollow fiber membrane and its components, and a metal salt solution storage tank.
[0039] Add a certain amount of NH to the glass reactor and the metal salt solution storage tank respectively 3 ·H 2 O and Ln(NO 3 ) 3 with ZrO(NO 3 ) 4 mixture. Under certain stirring speed and ultrasonic frequency, Ln(NO 3 ) 3 with ZrO(NO 3 ) 4 The mixed solution is injected into the pipe of the hollow fiber membrane at a certain flow rate, and diffuses into the NH 3 ·H 2 O solution to react with it.
[0040] The specific preparation process is as follows: first dissolve 8.0g PVP in 200mL deionized water, then dissolve 0.65g NH 3 ·H 2 O was dissolved in 50mL of deionized water, and then the two solutions were mixed and placed in a glass reactor, and the glass reactor was placed in the ultrasonic generator ...
Embodiment 2
[0042] The precursor powder of the oxygen storage material was analyzed by TG and DSC using the STA 449C comprehensive thermal analyzer produced by the German NETZSCH company. 2 As the carrier gas, air was used as the experimental gas, the heating rate was controlled at 10°C / min, and the TG and DSC curves of the precursor powder of the oxygen storage material were recorded. from figure 1 It can be seen that (CeO 2 ) 0.6 - (ZrO 2 ) 0.4 The weight loss rate of the precursor powder is the largest at 100-500 °C, reaching 19%, which is close to the theoretical weight loss rate of 19.6% for the decomposition of the precursor powder, and the weight loss changes little above 500 °C, indicating that (CeO 2 ) 0.6 - (ZrO 2 ) 0.4 The decomposition reaction of the precursor powder is nearly complete, and a solid solution is formed at nearly 600 °C. (PrO 2 ) 0.6 - (ZrO 2 ) 0.4 The weight loss rate of the precursor powder is the largest between 100-700°C, as high as 22%, which ex...
Embodiment 3
[0045] The crystal structure of the fresh oxygen storage material powder was analyzed by a PW 1700 X-ray diffractometer produced by the Netherlands PHILIPS company, in which the diffraction target was a Cu target (wavelength l=0.15406 nm), the working voltage was 40 kV, and the working current was 40 mA , the scanning speed is 0.2° / s. For the catalytic performance of cerium-zirconium oxide nanopowders, where (CeO 2 ) 0.4 - (ZrO 2 ) 0.6 and (CeO 2 ) 0.6 - (ZrO 2 ) 0.4 Treating at 600°C for 3 hours has completely formed a tetragonal solid solution. image 3 (a) is (PrO 2 ) x - (ZrO 2 ) 1-x (x = 0.4, 0.6, 0.8) XRD patterns of fresh oxygen storage materials (precursor powder treated at 700°C for 3 hours). It can be found that at 600°C (PrO 2 ) 0.4 - (ZrO 2 ) 0.6 and (PrO 2 ) 0.6 - (ZrO 2 ) 0.4 No solid solution is formed, and the oxygen storage material presents an amorphous structure; while (PrO 2 ) 0.8 - (ZrO 2 ) 0.2 A tetragonal solid solution is forme...
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