Step-by-step solid-phase synthesis of micro-mesoporous calcium aluminate catalysts
A micro-mesoporous calcium aluminate, solid-phase synthesis technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as small surface area, large specific gravity, and lack of pore structure
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Embodiment 1
[0016] Example 1, the nano-calcium carbonate powder and aluminum sol are ground and mixed with a ball mill according to the calcium oxide: alumina-based stoichiometry 12:7 to form a calcium-aluminum mixed powder, and a mixture of 2% modified starch and asphalt powder is used Add 15% water to make a binder melt, then add it to the mixer and mix it with the calcium-aluminum mixed powder in a semi-dry method to bond and granulate; the first step is to react in the rotary kiln reactor at an outlet temperature of 500°C 1. The conditions of residence time of 2.5 hours make the binder pyrolyze and generate coke. In the second step, the internal heating rotary kiln reactor is heated to an outlet temperature of 1200°C and the residence time of 3.5 hours is used to decompose calcium carbonate, calcium oxide and alumina. A solid-phase reaction occurs to generate calcium aluminate microsphere powder. In the third step, in the fluidized bed gasifier installed at the outlet of the rotary kil...
Embodiment 2
[0018] Example 2, limestone powder, alumina powder and superfine calcium aluminate powder are ground and mixed with a ball mill according to the calcium oxide: alumina base stoichiometry 12:6 to form a calcium-aluminum mixed powder. Add 10% water to the mixture to form a lignin adhesive melt, then add it to the mixer and mix it with calcium-aluminum mixed powder in a semi-dry method to bond and make particles; the first step is to react at the outlet of the rotary kiln reactor The temperature is 500°C and the residence time is 3.5 hours to make the binder pyrolyze and generate coke. In the second step, the internal heating rotary kiln reactor is heated to an outlet temperature of 1100°C and the residence time is 2.5 hours to decompose the limestone, calcium oxide and Alumina undergoes a solid-phase reaction to form calcium aluminate microspheres. In the third step, segmented air is used to burn the pyrolysis coke in calcium aluminate in the moving bed burner set at the outlet o...
Embodiment 3
[0020] Example 3, nano-calcium carbonate powder and aluminum sol are mixed according to calcium oxide: aluminum oxide-based stoichiometry 12:7, and 1% lignin binder is added and mixed uniformly with a colloid mill to form a calcium-aluminum mixed slurry. Atomization and granulation; the first step is to pyrolyze the binder in the calcium aluminum micropowder to generate coke in the rotary kiln reactor at an outlet reaction temperature of 450°C and a residence time of 1.5 hours; The reactor is heated to an outlet temperature of 1200°C and a residence time of 3.5 hours to decompose calcium carbonate, and a solid-phase reaction occurs between calcium oxide and alumina to form calcium aluminate microspheres. In the third step, the fluidized bed gas set at the outlet of the rotary kiln The vaporization of pyrolysis coke in the calcium aluminate in the carburetor also reduces the temperature of the calcium aluminate catalyst due to the gasification endothermic reaction, and the fluid...
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