Catalyst for methanol production from carbon dioxide and water and method for its preparation and use
A catalyst and methanol technology, applied in the field of methanol synthesis catalysts, can solve the problems of complex catalyst preparation process, low photocatalytic quantum yield, low catalytic efficiency, etc., and achieve the effects of avoiding shortage of hydrogen resources, high catalytic efficiency and cheap source of raw materials
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Embodiment 1
[0029] Disperse 19.8g of aluminum isopropoxide in 100mL of distilled water and hydrolyze at 80°C for 1 hour, then increase the temperature of the water bath to 95°C and continue to hydrolyze for 2 hours, then add the aqueous solution containing 58.6g of copper nitrate and 36.1g of zinc nitrate to the above sol , heated and stirred to form a gel, the gel was dried at 100°C, calcined at 450°C, and then heated in H 2 The CuZnAl catalyst was obtained by reduction treatment at 450°C for 5 hours in the atmosphere. The metal Fe powder and the CuZnAl catalyst were placed in the upper and lower parts of the reactor at a mass ratio of 1:2, and filled at a space velocity of 300 h -1 , water volume 0.01 mL / min, 300 ℃, 2MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 3.5; CH 3 OH selectivity (C-mol %) was 92.4.
Embodiment 2
[0031] Disperse 4.9g of aluminum isopropoxide in 100 mL of distilled water and hydrolyze at 80°C for 1 hour, then increase the temperature of the water bath to 95°C and continue the hydrolysis for 2 hours, then add the aqueous solution containing 58.6g of copper nitrate and 36.1g of zinc nitrate to the above sol , heated and stirred to form a gel, the gel was dried at 100°C, calcined at 450°C, and then heated in H 2 The CuZnAl catalyst was obtained by reduction treatment at 450°C for 5 hours in the atmosphere. The metal Mn powder and the CuZnAl catalyst were placed in the upper and lower parts of the reactor in a mass ratio of 1:3, and filled at a space velocity of 150 h -1 , water volume 0.01 mL / min, 400°C, 3MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 5.3; CH 3 OH selectivity (C-mol %) was 84.5.
Embodiment 3
[0033] Disperse 4.9g of aluminum isopropoxide in 100mL of distilled water and hydrolyze at 80°C for 1 hour, then increase the temperature of the water bath to 95°C and continue the hydrolysis for 2 hours, then add 117.2g of copper nitrate and 72.2g of zinc nitrate into the above sol, Heat and stir to form a gel, dry the gel at 100°C, bake at 450°C, and then heat it under H 2 The CuZnAl catalyst was obtained by reduction treatment at 450°C for 5 hours in the atmosphere. The metal Zn powder and the CuZnAl catalyst were placed in the upper and lower parts of the reactor in a mass ratio of 1:4, and filled at a space velocity of 500 h -1 , water volume 0.03 mL / min, 500°C, 4MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 8.7; CH 3 OH selectivity (C-mol %) was 67.5.
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