A kind of preparation method of solid acid catalyst for producing ethylene by oxidative coupling of methane
A solid acid catalyst, oxidative coupling technology, used in carbon compound catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low methane conversion rate, safety, and yield low problems, to achieve the effect of good catalytic performance, enhanced activity, and high catalytic performance
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Embodiment 1
[0024] Example 1 A method for preparing a solid acid catalyst for oxidative coupling of methane to ethylene, comprising the following steps:
[0025] (1) Add 2 g of anatase TiO 2 Fully ground to 6000~7000 mesh, added to 0.112 g / 5 mL ammonium metatungstate solution, ultrasonically impregnated for 20 minutes under the condition of ultrasonic frequency of 45KHz and temperature of 20°C, and then stirred and evaporated to dryness in 80°C water bath to obtain Tungsten-titanium solid acid precursor; the tungsten-titanium solid acid precursor is heated to 800°C at a heating rate of 4°C / min in a muffle furnace, roasted for 3 hours, and then ground into powder to obtain WO 3 5 wt% solid acid WO 3 / TiO 2 carrier.
[0026] (2) Add 0.138 g LiNO to 10 mL ionized water in sequence 3 , 0.358 g Mn(NO 3 ) 2 (50%), and make it dissolve completely, then add 1.448 g solid acid WO 3 / TiO 2 The carrier is impregnated by an excessive impregnation method to obtain an impregnation;
[0027] (3...
Embodiment 2
[0031] Example 2 A method for preparing a solid acid catalyst for oxidative coupling of methane to ethylene, comprising the following steps:
[0032] (1) Add 2 g of anatase TiO 2 After being fully ground to 6000~7000 mesh, it was added to 0.185 g / 5 mL ammonium metatungstate solution, ultrasonically impregnated for 20 minutes under the conditions of ultrasonic frequency of 200KHz and temperature of 60°C, and then stirred and evaporated to dryness in a water bath of 80°C to obtain Tungsten-titanium solid acid precursor; the tungsten-titanium solid acid precursor is heated to 800°C at a heating rate of 4°C / min in a muffle furnace, roasted for 3 hours, and then ground into powder to obtain WO 3 8 wt% solid acid WO 3 / TiO 2 carrier.
[0033] (2) Add 0.138 g LiNO to 10 mL ionized water in sequence 3 , 0.358 g Mn(NO 3 ) 2 (50%), and make it dissolve completely, then add 1.493 g solid acid WO 3 / TiO 2 The carrier is impregnated by an excessive impregnation method to obtain an ...
Embodiment 3
[0038] Example 3 A method for preparing a solid acid catalyst for oxidative coupling of methane to ethylene, comprising the following steps:
[0039] (1) Add 2 g of anatase TiO 2 Fully ground to 6000~7000 mesh, added to 0.112 g / 5 mL ammonium metatungstate solution, ultrasonically impregnated for 20 minutes under the condition of ultrasonic frequency of 45KHz and temperature of 20°C, and then stirred and evaporated to dryness in 80°C water bath to obtain Tungsten-titanium solid acid precursor; the tungsten-titanium solid acid precursor is heated to 800°C at a heating rate of 4°C / min in a muffle furnace, roasted for 2 hours, and then ground into powder to obtain WO 3 5 wt% solid acid WO 3 / TiO 2 carrier.
[0040] (2) Add 0.138 g LiNO to 10 mL ionized water in sequence 3 , 0.358 g Mn(NO 3 ) 2 (50%), and make it dissolve completely, then add 1.448 g solid acid WO 3 / TiO 2 The carrier is impregnated by an excessive impregnation method to obtain an impregnation;
[0041] (3...
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