A kind of noble metal catalyst for propane dehydrogenation to propylene and its preparation and application
A noble metal catalyst and propane dehydrogenation technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve problems such as low propylene selectivity and high temperature sintering of noble metals
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Embodiment 1
[0020] Embodiment 1 adopts the method provided by the present invention to prepare magnesium-gallium composite oxide MgO xGa 2 o 3 (x=1). Concrete steps are as follows: (1) take by weighing 0.05 mole of magnesium nitrate hexahydrate and 0.10 mole of gallium nitrate nonahydrate and be dissolved in 500mL water respectively, stir and dissolve, form the magnesium nitrate of 0.10mol / L and the gallium nitrate solution of 0.20mol / L; ( 2) Then add an appropriate amount of 10wt.% ammonia water, adjust the pH value to 9, stir for 12 hours, and filter; (3) Dry the filter cake at 120°C for 12 hours, and then roast it at 600°C for 5 hours to obtain MgO·Ga 2 o 3 Magnesium gallium composite oxide support.
Embodiment 2
[0022] Example 2 Using the method provided by the present invention, the magnesium-gallium composite oxide prepared in Example 1 was used as a carrier to prepare a highly dispersed rhodium catalyst supported by magnesium-gallium composite oxide. The specific method is as follows: Weigh 5.0g MgO·Ga 2 o 3 Add the carrier to 150ml of rhodium chloride aqueous solution containing 0.05g of rhodium, stir at room temperature for 2h, filter, wash, and dry the obtained solid at 150°C for 2 hours, roast it in air at 600°C for 5 hours, and then reduce it in pure hydrogen at 800°C 2h. Obtain a highly dispersed rhodium catalyst supported by magnesium-gallium composite oxide, denoted as Rh / MgO·Ga 2 o 3 .
Embodiment 3
[0024] Example 3 Using the method provided by the present invention, the magnesium-gallium composite oxide-supported highly dispersed iridium catalyst was prepared using the magnesium-gallium composite oxide prepared in Example 1 as a carrier. The specific method is as follows: Weigh 5.0g MgO·Ga 2 o 3 Add the carrier to 150ml of chloroiridic acid aqueous solution containing 0.15g of iridium, stir at room temperature for 24h, filter, wash, and dry the obtained solid at 90°C for 24 hours, roast it in air at 400°C for 12 hours, and then reduce it in pure hydrogen at 600°C 5h. A highly dispersed iridium catalyst supported by magnesium-gallium composite oxide is obtained, denoted as Ir / MgO·Ga 2 o 3 .
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