Strontium-doped ordered mesoporous lanthanum manganate supported noble metal palladium composite material, and preparation method and application thereof in catalytic oxidation of toluene
A mesoporous lanthanum manganate and composite material technology, applied in the field of nanocomposite materials, can solve problems such as deactivation and precious metal agglomeration, and achieve the effects of improved performance, good repeatability, and high specific surface area
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Embodiment 1
[0039] Example 1 Ordered mesoporous La 0.8r S 0.2 MnO 3 preparation, the specific steps are as follows:
[0040] Mix 4g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123), 130ml of ultrapure water and 20ml of concentrated hydrochloric acid (37wt%), then add 8.32g of tetraethylorthosilicate Esters, stirred and reacted in a water bath at 38°C for 24 hours, after the end, transferred to a reaction kettle, hydrothermally reacted at 110°C for 24 hours, cooled to room temperature naturally, filtered and washed until neutral, dried at 80°C, dried Then calcined at 10°C / min from room temperature to 550°C for 6 hours to obtain the product silicon template.
[0041] 3.2 mmol La(NO 3 )3 ·6H 2 O, 4 mmol Mn(NO 3 ) 2 , 0.8 mmol Sr(NO 3 ) 2 Dissolve in 5ml of distilled water and 15ml of absolute ethanol to obtain a homogeneous solution, then add 4 mmol of citric acid to the above solution and mix for 1 hour at room temperature, then add 1g of silic...
Embodiment 2
[0044] Embodiment 2 Preparation of lanthanum manganate (LMO) and nano-casting lanthanum manganate (N-LMO), the specific steps are as follows:
[0045] 4 mmol La(NO 3 ) 3 ·6H 2 O, 4 mmol Mn(NO 3 ) 2 , dissolved in 5ml of distilled water and 15ml of absolute ethanol to obtain a homogeneous solution, then, add 4 mmol of citric acid to the above solution and mix at room temperature for 1 hour, then dry the solution in an oven at 80°C for 6 hours, and grind thoroughly, Calcined at 500 °C for 5 h in a muffle furnace, and then heated to 700 °C for 8 h. During the whole heating process, the heating rate was 5 °C / min. Lanthanum manganate is obtained as LaMnO 3 carrier (LMO).
[0046] 4 mmol La(NO 3 ) 3 ·6H 2 O, 4 mmol Mn(NO 3 ) 2 , dissolved in 5ml of distilled water and 15ml of absolute ethanol to obtain a homogeneous solution, then, 4 mmol of citric acid was added to the above solution and mixed for 1 hour at room temperature, then 1g of silicon template was added and mix...
Embodiment 3
[0048] Example 3 The preparation of a composite material of strontium-doped ordered mesoporous lanthanum manganate loaded noble metal palladium, the specific steps are as follows:
[0049] A certain amount of sodium chloropalladate solution (1wt%, 2wt%, 4wt%, 6wt%, with La 0.8 Sr 0.2 MnO 3 Carrier as base) was added to 120mg La dispersed in 15mL ethanol 0.8 Sr 0.2 MnO 3 In the carrier, conventional magnetic stirring at 60°C for 8h, the black powder was obtained, and then the black powder was mixed in 10vol%H 2 / N 2 Calcined in the atmosphere, the calcination temperature is 250°C, the calcination time is 2h, and the heating rate is 10°C / min, to obtain a composite material of strontium-doped ordered mesoporous lanthanum manganate loaded noble metal palladium, wherein the palladium loading mass accounts for La 0.8 Sr 0.2 MnO 3 2% of the sample is recorded as 2 wt% Pd La 0.8r S 0.2 MnO 3 .
[0050] attached Figure 7 It is the TEM image of the composite material of s...
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