Ag-CuCl catalyst for the direct oxidation of propylene with air to prepare epoxypropane
A technology of propylene oxide and catalyst is applied in the field of Ag-CuCl catalyst and its preparation, which can solve problems such as research that has not yet been reported.
Inactive Publication Date: 2003-11-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
Although there have been many catalyst patents in this field, the use of Ag-CuCl as the direct air oxidation of propylene to propylene oxide has not been reported yet.
Method used
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Embodiment 1
[0012] The detailed preparation process of powder Ag(A): Add potassium hydroxide solution to an equimolar silver nitrate and glucose mixed aqueous solution at 30°C with stirring, then age at 75°C for 1 hour, then filter, wash with water, and finally bake at 120°C for 12 hours.
Embodiment 2
[0014] The detailed preparation process of powder Ag(B): in a certain amount of silver nitrate solution, add hydrazine hydrate for reduction, precipitate, filter, wash with water, and finally bake at 120°C for 10 hours.
Embodiment 3
[0016] The detailed preparation process of powder Ag(C): silver nitrate is directly decomposed at 500°C for 4 hours.
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The catalyst has precursor comprising Ag and CuCl and features that powdered Ag and powdered CuCl after being mixed mechanically are roasted in air atmosphere at 300-650 deg.c; that the Ag-CuCl catalyst prepared through the simple process has composition dependent on the CuCl content; that the catalyst with CuCl content of 15-30 wt% and composition of AgCl, CuO and Ag has optimal catalyst performance including propylene conversion rate of 3-5 % and epoxypropane selectivity of 30-40 %; and that during reaction, the activity of the catalyst exhibits raising trend while the selectivity maintaining unchanged.
Description
technical field [0001] The invention relates to an Ag-CuCl catalyst capable of catalyzing the direct air oxidation of propylene to produce propylene oxide and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is one of the important basic organic chemical raw materials. It is the raw material of important organic chemicals, such as polyurethane, propylene glycol, non-ionic surfactant, oilfield demulsifier, etc. Since the first synthesis of propylene oxide in 1860, there have been no less than 20 production techniques. Now the industry mainly adopts the chlorohydrin method and the Halcon method. Due to serious environmental problems and high production costs of the existing production process. The development of clean and cheap propylene oxide production technology has always been one of the most concerned issues in the world. Among them, the direct oxidation of propylene to propylene oxide with air is the most ideal technical route. Since ...
Claims
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IPC IPC(8): B01J23/72B01J23/89B01J27/10C07D305/04
Inventor 李灿罗孟飞鲁继青
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI