Catalyst for synthesizing methyl formate and preparation method of catalyst for synthesizing methyl formate
A technology of methyl formate and catalyst, which is applied in the field of methyl formate synthesis catalyst and its preparation method, can solve problems such as loss, and achieve the effects of easy operation, simple preparation and good methanol dehydrogenation performance
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Embodiment 1
[0024] 12.39g ammonium heptamolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O) broken into particles below 0.5 mm, and calcined at 400° C. for 2 hours to obtain a carbide precursor. Using the mixed gas of methane and hydrogen as the carbonization medium (the volume ratio of methane and hydrogen is 1:4), in a fixed bed reactor, 0.1MPa, 10000h -1 The temperature-programmed carbonization treatment was carried out on the precursor under the condition of space velocity. The temperature-rising program was as follows: increase from room temperature to 750 °C at a rate of 5 °C / min, stay for 3 hours, and then cool down to room temperature naturally. At room temperature, the carbonized sample was passivated by using air and argon to configure a passivation gas with an oxygen volume concentration of 5.0%. The passivation time was 6 hours, and 7.1 g of metal carbides were obtained.
[0025] According to the molar ratio of K and Mo of 0.15:1, an appropriate amount of potassium nitrate was weighed...
Embodiment 2
[0028] 13.93g ammonium dimolybdate ((NH 4 ) 2 Mo 2 o 7 ) into particles below 0.8mm, and calcined at 700°C for 3 hours to obtain a carbide precursor. Using the mixed gas of ethane and hydrogen as the carbonization medium (the volume ratio of ethane and hydrogen is 1:6), in a fixed bed reactor, 1.0MPa, 11000h -1 Under space velocity conditions, the precursor was subjected to temperature-programmed carbonization treatment. The temperature-rising program was as follows: increase from room temperature to 675 °C at a rate of 1 °C / min, stay for 4 hours, and then cool down to room temperature naturally. At room temperature, the carbonized sample was passivated by configuring a passivation gas with an oxygen volume concentration of 1.0% with oxygen and argon. The passivation time was 5 hours, and 7.1 g of metal carbides were obtained.
[0029] According to the molar ratio of Fe and Mo of 0.8:1, an appropriate amount of iron nitrate was weighed and mechanically mixed with the obtai...
Embodiment 3
[0031] 13.33 ammonium tungstate ((NH 4 ) 10 h 2 (W 2 o 7 ) 6 ) into particles below 1.0mm, and calcined at 800°C for 4 hours to obtain a carbide precursor. Using the mixed gas of ethane, ethylene and hydrogen as the carbonization medium (the volume ratio of (ethane+ethylene) and hydrogen is 1:5), in a fixed bed reactor, 0.6MPa, 13000h -1 The temperature-programmed carbonization treatment was carried out on the precursor under the space velocity condition. The temperature-rising program was as follows: increase from room temperature to 1000 °C at a rate of 4 °C / min, stay for 1 h, and then cool down to room temperature naturally. At room temperature, oxygen and helium were used to prepare a passivation gas with an oxygen volume concentration of 3.0% to passivate the carbonized sample. The passivation time was 5 hours, and 10.0 g of metal carbide was obtained.
[0032] Weigh an appropriate amount of sodium bicarbonate and mechanically mix it with the obtained metal carbide ...
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