Supported catalyst for synthesis of dimethyl carbonate, preparation method and using method thereof
A supported catalyst, dimethyl carbonate technology, applied in catalyst activation/preparation, chemical instruments and methods, carbon dioxide or inorganic carbonate preparation, etc., can solve the problem of uneven catalytic effect, unstable catalytic activity, volatile It can achieve the effect of high activity and stability, convenient repeated regeneration and activation, and easy separation.
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[0020] Example 1
[0021] Accurately weigh 3gSiO 2 , add 40ml absolute ethanol, ultrasonically disperse for 1 hour; accurately weigh 0.1820g Cu(NO 3 ) 2 ·3H 2 O, 0.1521g Fe (NO 3 ) 3 ·9H 2 O and 0.2849g citric acid in 20ml deionized water. The citric acid solution of metal ions was poured into the ultrasonically dispersed carrier, stirred at room temperature for 24 h, and ultrasonically dispersed for 1 h. Then, the above mixed solution was rotary evaporated to dryness at 60°C, and dried in an oven at 80°C overnight. The catalyst was obtained after calcination at 450°C for 3 hours, and then reduction and activation with hydrogen at 500°C for 3 hours.
[0022] Weigh 1 g of the above-mentioned catalyst, add it to the catalytic bed of the fixed-bed catalytic micro-reaction device to evaluate the reaction performance, adjust the ratio of carbon dioxide and methanol to 1:2, the reaction pressure is 1.2 MPa, the catalyst bed temperature is 130 ° C, and a 7890F type gas chroma...
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[0023] Example 2
[0024] The preparation method is as in Example 1, the carrier SiO 2 , and the transition metal nitrate Cu(NO 3 )2·3H 2 O, Fe (NO 3 ) 3 ·9H 2 The amounts of O and the complex citric acid are respectively: 3g, 0.8190g, 0.9130g and 1.4245g, the catalytic reaction test conditions are the same as those in Example 1, and the results are shown in Table 1.
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[0025] Example 3
[0026] The preparation method is the same as in Example 1, the carrier SiO 2 , and the transition metal nitrate Cu(NO 3 )2·3H 2 O, Fe (NO 3 ) 3 ·9H 2 The amounts of O and the complex citric acid are respectively: 3g, 0.4553g, 3.8070g and 2.8515g, the catalytic reaction test conditions are as in Example 1, and the results are shown in Table 1
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