Catalyst for exhaust gas purification
An exhaust gas purification and catalyst technology, which is applied in the directions of physical/chemical process catalysts, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc., and can solve the problems of catalyst activity reduction and grain growth, etc.
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Embodiment 1
[0077] Lanthanum methoxypropoxide [La(OCHMeCH 2 OMe)3 ]40.6g (0.100 mol) and iron methoxypropoxide [Fe(OCHMeCH 2 OMe) 3 ] 30.7 g (0.095 mol) was added to a 500-ml round bottom flask, 200 mL of toluene was added and stirred to dissolve it to prepare a mixed alkoxide solution. And, the rhodium acetylacetonate [Rh(CH 3 COCHCOCH 3 ) 3 ] 2.00 g (0.005 mol) was dissolved in 200 mL of toluene, and the solution was added to the mixed alkoxide solution in a round bottom flask to prepare a uniform mixed solution containing LaFeRh.
[0078] Then, 200 mL of deionized water was dropped into the round bottom flask over about 15 minutes. This hydrolysis produces a brown viscous precipitate.
[0079] After that, it was stirred at room temperature for 2 hours, and then toluene and water were distilled off under reduced pressure to obtain a LaFeRh composite oxide precursor. Then, the precursor was transferred to a shallow bottom plate, and after ventilating and drying at 60°C for 24 hours, it was h...
Embodiment 2
[0082] Lanthanum methoxypropoxide [La(OCHMeCH 2 OMe) 3 ] 28.4g (0.070 mol), praseodymium methoxypropoxide [Pr(OCHMeCH 2 OMe) 3 ] 12.2g (0.030 mol), iron methoxypropoxide [Fe(OCHMeCH 2 OMe) 3 ] 30.7 g (0.095 mol) was added to a 500-ml round bottom flask, 200 mL of toluene was added, and stirred to dissolve, thereby preparing a mixed alkoxide solution. And, the rhodium acetylacetonate [Rh(CH 3 COCHCOCH 3 ) 3 ] 2.00 g (0.005 mol) was dissolved in 200 mL of toluene, and the solution was added to the mixed alkoxide solution in a round bottom flask to prepare a uniform mixed solution containing LaPrFeRh.
[0083] Then, the same operation as in Example 1 was used to obtain a dark brown powder.
[0084] The powder was measured by powder X-ray diffraction, and the result showed that the powder was La 0.70 Pr 0.30 Fe 0.95 Rh 0.05 O 3 A single crystalline phase composed of complex oxides with a perovskite-type lattice structure. In addition, its specific surface area is 30m 2 / g, the Rh cont...
Embodiment 3
[0108] Lanthanum methoxypropoxide [La(OCHMeCH 2 OMe) 3 ]32.5g (0.080mol), neodymium methoxypropoxide [Nd(OCHMeCH 2 OMe) 3 ]6.2g (0.015mol), cerium methoxypropoxide [Ce(OCHMeCH 2 OMe) 3 ]2.0g (0.005 mol), iron methoxypropoxide [Fe(OCHMeCH 2 OMe) 3 ] 19.4g (0.060 mol), manganese methoxypropoxide [Mn(OCHMeCH 2 OMe) 2 ] 11.3 g (0.035 mol) was added to a 500-ml round bottom flask, 200 mL of toluene was added, and stirred to dissolve, thereby preparing a mixed alkoxide solution.
[0109] Then, 11.5 g (equivalent to 0.51 g, 0.005 mol in terms of Rh) of a rhodium nitrate aqueous solution (Rh portion 4.478 mass%) diluted with 150 mL of deionized water was dropped into the round bottom flask over about 15 minutes. This hydrolysis produces a dark brown viscous precipitate.
[0110] Next, the same operation as in Example 1 was used to obtain a dark brown powder. It should be noted that the heat treatment was performed at 850°C for 2 hours.
[0111] The powder was measured by powder X-ray diffra...
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