Catalyst for methacrylic acid production, coated catalyst, and process for producing the same
A technology of methacrylic acid and coating catalyst, which is applied in catalyst activation/preparation, chemical elements of heterogeneous catalysts, chemical instruments and methods, etc. Problems such as coating inactive carriers with difficult catalytically active materials
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Embodiment A1
[0084] (1) Preparation of catalyst
[0085] 300g of molybdenum trioxide, 11.37g of vanadium pentoxide, 3.31g of copper oxide, 8.32g of copper acetate monohydrate, 28.32g of 85% phosphorous acid and 24.64g of arsenic acid are dispersed or dissolved in 1900ml of pure water, and then stirred at 95-100 It was heated to reflux at °C for about 6 hours to obtain a reddish-brown transparent solution.
[0086] Antimony trioxide (1.52 g) was added to the above solution, and then heated to reflux at 95-100° C. for about 3 hours to obtain a dark blue solution.
[0087] Then, the solution was dried by a spray dryer to obtain catalyst particles. Catalyst particles (319g) were mixed with 44.7g of ceramic fibers to obtain powder, which was then gradually sprayed onto 300g of spherical porous alumina carriers in a rotating drum under the condition of dripping 90% aqueous ethanol solution, to use catalyst Particle coated spherical supports. Little loss of powder was observed during the proce...
Embodiment A2
[0097] 300g of molybdenum trioxide, 24.64g of vanadium pentoxide, 8.32g of copper acetate monohydrate, 26.42g of 85% phosphorous acid and 9.22g of rubidium nitrate are dispersed or dissolved in 1900ml of pure water, then stirred and heated to reflux at 95-100°C for about 9 hours to obtain a reddish-brown clear solution.
[0098] Then, the solution was dried by a spray dryer to obtain catalyst particles.
[0099] Subsequent steps were the same as in Example A1 to obtain a coated catalyst. The coated catalyst has Mo 10 V 1.3 P 1.1 Cu 0.2 Rb 0.3 active ingredient composition.
[0100] The coated catalyst thus obtained was used in the same reaction as in Example A1. The conversion of methacrolein was 74.2%, and the selectivity of methacrylic acid was 79.0%. Comparative example 2
Embodiment A3
[0106] The coated catalyst was prepared using the same procedure as in Example A1, except that 3.59 g of cerium oxide was used instead of antimony trioxide.
[0107] The resulting coated catalyst has Mo 10 V 0.6 P 1.2 Cu 0.4 As 0.5 Ce 0.1 active ingredient composition.
[0108] The coated catalyst thus obtained was used in the same reaction as in Example A1. The conversion rate of methacrolein was 85.2%, and the selectivity of methacrylic acid was 84.0%.
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