Catalyst for preparation of propylene and ethylene from mixed C4 alkenes and application thereof
A catalyst and ethylene technology, applied in molecular sieve catalysts, physical/chemical process catalysts, hydrocarbon cracking and hydrocarbon production, etc., can solve the problem of not having high propylene yield and low hydrogen transfer reaction degree at the same time, and not giving low hydrogen transfer reaction degree And other issues
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Embodiment 1
[0030] Catalyst preparation: Mix HZSM-5 molecular sieve (purchased from the market, the molar ratio of silicon to aluminum is 200) and alumina (3:1 by weight), stir and knead, and extrude. Dry at 100°C for 10h, and bake at 560°C for 4h. The strips were placed in an aqueous solution containing potassium nitrate, diammonium hydrogen phosphate and lanthanum nitrate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. Based on the weight percentage of the catalyst, the catalyst contains 74.0% ZSM-5 molecular sieve, 23.8% aluminum oxide, 0.2% potassium oxide, 1.0% phosphorus oxide and 1.0% lanthanum oxide.
[0031] Catalyst evaluation conditions are: reaction temperature 520°C, pressure 0.1MPa, weight ratio of water in feed to feed C4 is 0.5, feed weight space velocity is 2.5h -1 . The reaction results are shown in Table 2.
Embodiment 2
[0033] Catalyst preparation: HZSM-5 molecular sieve (purchased from the market, with a silicon-aluminum molar ratio of 200) and alumina (a weight ratio of 3:1) were evenly mixed, stirred and kneaded, and extruded to shape. Dry at 100°C for 10h, and bake at 560°C for 4h. The strips were placed in an aqueous solution containing potassium nitrate, diammonium hydrogen phosphate and cerium nitrate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. Based on the weight percentage of the catalyst, the catalyst contains 74.0% ZSM-5 molecular sieve, 23.8% aluminum oxide, 0.2% potassium oxide, 1.0% phosphorus oxide and 1.0% cerium oxide. Catalyst evaluation conditions are the same as in Example 1. The reaction results are shown in Table 2.
Embodiment 3
[0035] Catalyst preparation: HZSM-5 molecular sieve (purchased from the market, with a silicon-aluminum molar ratio of 200) and alumina (a weight ratio of 3:1) were evenly mixed, stirred and kneaded, and extruded to shape. Dry at 100°C for 10h, and bake at 560°C for 4h. The strips were placed in an aqueous solution containing potassium nitrate and diammonium hydrogen phosphate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. Based on the weight percentage of the catalyst, the catalyst contains 74.1% ZSM-5 molecular sieve, 24.75% aluminum oxide, 0.15% potassium oxide and 1.0% phosphorus oxide. Catalyst evaluation conditions are the same as in Example 1. The reaction results are shown in Table 2.
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