Alkyne selective hydrogenation catalyst as well as preparation method and application thereof
A technology for selective hydrogenation and catalyst, applied in the field of alkyne hydrogenation, can solve the problem of inability to obtain butadiene-rich products, avoid excessive hydrogenation and polymerization coke deposition process, save production costs, improve selectivity and life Effect
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Embodiment 1-32
[0064] The alkyne selective hydrogenation catalyst of embodiment 1-32, each component is as shown in table 1, and its preparation process is:
[0065] Step A, first prepare a certain concentration of nickel nitrate solution, aluminum nitrate solution and IB group and / or IIB group metal nitrate solutions with deionized water respectively, and obtain a mixed solution after mixing the various solutions; then use deionized water to separate Prepare a solution of a certain concentration of rare earth metal nitrate, alkali metal and / or alkaline earth metal nitrate;
[0066] Step B. Control the temperature of the mixed solution to 70°C, add the precipitant ammonia water under vigorous stirring, adjust the pH value to about 8.5, react for 40 minutes, and age for 0.5 hours;
[0067] Step C, under vigorous stirring, add a solution containing rare earth compounds, a solution containing alkali metals and / or alkaline earth metal compounds and ammonia water as a precipitant to the mixed sol...
Embodiment 33
[0074] Step A, first prepare nickel nitrate solution, aluminum nitrate solution, copper nitrate solution, lanthanum nitrate solution, lithium nitrate solution with deionized water respectively;
[0075] Step B. Mix all the above solutions, control the temperature of the mixed solution to 70°C, add the precipitant ammonia water under vigorous stirring, adjust the pH value to about 8.5, react for 40 minutes, and age for 1.5 hours; filter the filter cake, and then use it The catalyst was prepared by washing with ion water, molding, and calcining at 450°C for 4 hours.
Embodiment 34
[0077] Except that the temperature of the mixed solution is controlled to be 45° C. in step B, the others are the same as in Example 1.
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