Iron-magnesium silica supported catalysts, methods of making and uses thereof
A technology of silica and catalysts, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., which can solve problems such as complex preparation methods and high selectivity
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[0035] B. Preparation of Catalysts of the Invention
[0036] The Fe-alkali metal-silica support of the present invention is prepared by co-precipitation. The method entails firstly introducing the alkaline earth metal silicate into the aqueous medium in the form of a sol having a certain size with respect to the water ligand, alkaline earth metal and silica moieties. An iron chelation precursor acting as a chelating agent in the silica-alkaline earth metal sol can then be added. The support material can be precipitated from solution using an alkaline solution, washed and dried. The dried material can be washed with an oxidizing solution to remove chelating agents (eg, citrate) and then dried. The catalytic transition metal can be precipitated or co-precipitated onto the dry support material. In some embodiments, an alkaline precipitating agent (eg, sodium carbonate) is added to the solution and can be removed by washing the resulting precipitate during separation. The resu...
Embodiment 1
[0055] (compared to CoMn / pyrolytic SiO 2 Catalyst Synthesis)
[0056] Silica (1.2 g) was suspended in demineralized (DM) water (100 mL) and stirred at 70°C for 1 hour. Two solutions of Co salt (14.55g) and Mn (12.55g) were dissolved in 100ml of deionized (DI) H at 70°C. 2 O mixed together. Sodium carbonate solution (1M) was prepared. These solutions were simultaneously added to the silica solution until a complete precipitate was formed. The resulting mixture was aged under stirring for 30 min, then washed with hot water, then dried overnight at 130°C and calcined in static air at 500°C (4h, 5°C / min). The catalyst is hereinafter designated by the symbol "A".
Embodiment 2
[0058] (Synthesis of CoMn / FeMgSiO support)
[0059] with deionized H 2 O Magnesium chloride (50 ml of a 1M solution) was diluted (to 100 mL) and stirred vigorously at 50 °C. Then, TEOS (10.4 g) was dropped thereinto. Then, ferric citrate crystals (0.25 g) were added and stirring was continued for 2 h. At this stage, the NH 4 OH (7M, 50ml stock to a total of 100mL) was added to the solution, the solution was stirred for another 2h, then filtered to completely precipitate, then washed with hot water. The resulting material was dried overnight and then soaked in hydrogen peroxide (15% 50ml) for 1h. After drying the support material for 4 h, the dried support material (1.2 g) was suspended in DM water (100 mL) and stirred at 70 °C for 1 h. Two solutions of Co salt (14.55 g) and Mn (12.55 g) were mixed together in deionized water (100 mL) and stirred at 70°C. Sodium carbonate solution (1M) was prepared. These solutions were simultaneously added to the carrier mixture until a...
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