Catalyst for synthesizing dimethyl oxalate with gas phase CO coupling as well as preparation method and application of catalyst
A technology of dimethyl oxalate and catalyst, applied in the field of preparation and application of noble metal catalysts, to achieve high conversion rate and selectivity, improve conversion rate and selectivity, and strengthen the effect of strong interaction
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Embodiment 1
[0041] The preparation process of a kind of catalyst involved in the present embodiment comprises the following steps:
[0042] Select 50g main component as θ-Al 2 o 3 The carrier, the carrier is added to 200mmol / L scandium nitrate solution and impregnated for 24 hours. The impregnated support was separated and dried, and calcined at 1200°C for 15 hours to obtain modified α-Al 2 o 3 carrier. Modified α-Al 2 o 3 The carrier is added to a palladium chloride solution with a pH of 1 and a concentration of 100 mmol / L, soaked at room temperature for 24 hours, and the soaked carrier is separated and dried, washed with alkaline solution, washed with water, and then dried. H was used before the catalyst was used 2 reduction, H 2 Airspeed is 500h -1 , the reduction temperature is 200°C, and the reduction time is 24 hours. Catalyst sample No. 1 was obtained, wherein the loading amount of palladium was 0.5wt%.
Embodiment 2
[0044] The preparation process of a kind of catalyst involved in the present embodiment comprises the following steps:
[0045] Select 50g main component as θ-Al 2 o 3 The carrier, the carrier was added 100mmol / L scandium nitrate solution and impregnated for 24 hours. The impregnated support was separated and dried, and calcined at 1200°C for 15 hours to obtain modified α-Al 2 o 3 carrier. Modified α-Al 2 o 3 The carrier is added to a palladium chloride solution with a pH of 1 and a concentration of 50 mmol / L, soaked at room temperature for 24 hours, and the soaked carrier is separated and dried, washed with alkaline solution, washed with water, and then dried. H was used before the catalyst was used 2 reduction, H 2 Airspeed is 500h -1 , the reduction temperature is 200°C, and the reduction time is 24 hours. Catalyst sample No. 2 was obtained, wherein the loading amount of palladium was 0.25wt%.
Embodiment 3
[0047] The preparation process of a kind of catalyst involved in the present embodiment comprises the following steps:
[0048] Select 50g main component as θ-Al 2 o 3 The carrier, the carrier is added to 50mmol / L scandium nitrate solution and impregnated for 24 hours. The impregnated support was separated and dried, and calcined at 1200°C for 15 hours to obtain modified α-Al 2 o 3 carrier. Modified α-Al 2 o 3 The carrier is added to a palladium chloride solution with a pH of 1 and a concentration of 20mmol / L, soaked at room temperature for 24 hours, and the soaked carrier is separated and dried, washed with alkaline solution, washed with water, and then dried. H was used before the catalyst was used 2 reduction, H 2 Airspeed is 500h -1 , the reduction temperature is 200°C, and the reduction time is 24 hours. Catalyst sample No. 3 was obtained, wherein the loading amount of palladium was 0.1 wt%.
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