Cobalt-bismuth Catalysts for Hydrogenation of Carboxylic Acids to Alcohols
A hydrogenation catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydroxyl compound preparation, etc., can solve low selectivity, high reaction pressure, harsh operating conditions, etc. problem, to achieve the effect of high selectivity, environmentally friendly composition and low cost
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Embodiment 1
[0057] Take 1 liter of 1.5 mol / L cobalt nitrate aqueous solution, add 20 g of bismuth nitrate pentahydrate into it, add 20 wt% sodium carbonate solution to precipitate until the pH value is about 9.0, and stir for 2 hours under heating conditions to obtain the precursor I.
[0058] Add 10g of concentrated nitric acid and 6g of calcium nitrate tetrahydrate into 300ml of water, and slowly add to 500g of diluted water glass aqueous solution (with a silicon dioxide content of about 10wt%) to form a white precipitate, and use a high-power stirrer to stir the precipitate to form Slurry, these slurry substances were added to the precursor I, and the aging was continued for 1 hour under stirring conditions. After washing and filtering, and drying overnight to obtain a dry filter cake, 15 ml of silver nitrate solution containing 0.1 wt % was sprayed into the filter cake and then granulated. The particles were calcined and decomposed, and then pelletized to obtain the catalyst CHZ-7...
Embodiment 2
[0060] Take 1 liter of 1.0mol / L cobalt nitrate aqueous solution, add 18g of bismuth nitrate pentahydrate and 3.1g of lanthanum nitrate into it, add 50g of refined diatomite (produced by Beijing Research Institute of Chemical Industry) after dissolving, and fully stir, Then add urea, heat up to 80°C and slowly hydrolyze until the pH value is about 6.5, filter and wash the above slurry, and dry overnight to obtain a dry filter cake, and spray 10ml of diluted phosphoric acid liquid on the filter cake. The filter cake was roasted and decomposed, and then pelletized to obtain the catalyst CHZ-72.
Embodiment 3
[0066] The above catalyst was evaluated in a fixed-bed reactor for the hydrogenation of acetic acid to produce ethanol. The filling volume was 10ml, diluted with 1:1 quartz sand, and reduced with pure hydrogen before use. The maximum reduction temperature was 450~500°C , the specific reaction conditions and reaction results are shown in Table 1.
[0067] In this example, the acetic acid conversion rate and ethanol selectivity were calculated according to the carbon mole percentage of each component.
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[0069]
[0070] Other products are: acetaldehyde, ethane, methane, carbon monoxide, carbon dioxide, acetic aldehyde, acetone, propanol, etc.
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