Novel ternary catalytic nanometer light rear earth oxygen-storage material as well as preparation method thereof
An oxygen storage material and light rare earth technology, which is applied in the field of novel ternary catalytic nanometer light rare earth oxygen storage material and its preparation, and achieves the effects of low aging calcination temperature, low sintering temperature and short sintering time
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Embodiment 1
[0029] The experimental system of the "ultrasonic membrane diffusion" method consists 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.
[0030] 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 and ZrO(NO 3 ) 4 mixture. At a certain stirring speed and ultrasonic frequency, Ln(NO 3 ) 3 and ZrO(NO 3 ) 4 The mixed solution was injected into the pipe of the hollow fiber membrane at a certain flow rate, and diffused into the NH 3 ·H 2 O solution to react with it.
[0031] The specific preparation process is as follows: 10.0 g PVP was dissolved in 200 mL deionized water first, and then 0.83 g 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 generat...
Embodiment 2
[0033] 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, and the heating rate was controlled at 10 °C / min. It is analyzed by PW 1700 X-ray diffractometer produced by Netherlands PHILIPS company, in which the diffraction target is Cu target (wavelength λ=0.15406 nm), the working voltage is 40 kV, the working current is 40 mA, and the scanning speed is 0.2° / s. Oxygen storage capacity (OSC) and oxygen desorption were made by self-made equipment (respectively by figure 1 (a) and (b) were tested.
Embodiment 3
[0035] The experimental process of measuring the oxygen storage capacity (OSC) by temperature-controlled desorption (TPR) is as follows: put the freshly prepared (or after aging) oxygen storage material into a self-made test device, and change it from room temperature to 10 °C in an oxygen atmosphere. The heating rate per minute was raised to 550°C, held for 30 minutes, and then dropped to room temperature under the protection of the gas; then Ar was used as the carrier gas, and the oxygen storage material was reduced by hydrogen pulse at different temperatures (up to 700°C). The hydrogen consumption of the oxygen storage material is used to calculate the oxygen storage capacity (OSC) of the oxygen storage material.
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