Aluminum-silicon-titanium composite oxide carrier and load type catalytic hydro-dearomatization catalyst
A composite oxide, aluminum silicon titanium technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem of poor stability, unsatisfactory effect, and unsatisfactory Catalyst long cycle life requirements and other issues, to achieve the effect of simple synthesis conditions and easy control
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[0034] Example 1
[0035] Weigh a certain quality of pseudo-boehmite and use absolute ethanol to make a slurry. The quality of the absolute ethanol used is 1.0 to 1.3 times that of the pseudo-boehmite, and then slowly drop it under the conditions of vigorous stirring. Nitric acid until the precipitate disappears to form a uniform slurry to obtain an aluminum sol.
[0036] Dissolve deionized water and nitric acid in anhydrous ethanol in sequence, and the molar ratio of water, nitric acid, and ethanol is 1:0.3:10 to obtain solution A; weigh a certain mass of Ti(OC 4 H 9 ) 4 Dissolved in ethanol to make titanium sol, Ti(OC 4 H 9 ) 4 The molar ratio with ethanol is 1:5; a certain mass of ethyl orthosilicate is slowly added dropwise to the above titanium sol, and stirring is continued to make it fully miscible, denoted as B; after stirring A and B separately for 20 minutes, At room temperature, pour solution A into the quick-controlled sampler, then control the sample rate to 4mL / min, ...
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[0045] Example 2
[0046] The composite carrier was prepared according to the method of Example 1, except that the acid used adipic acid to prepare Al 2 O 3 -SiO 2 -TiO 2 The BET characterization of the series of composite oxides is similar to the results of Example 1.
[0047] The carrier is further impregnated with precious metals Pt and Pd to make PtPd / Al 2 O 3 -SiO 2 -TiO 2 Series of catalysts.
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[0048] Example 3
[0049] In the same way as in Example 1, Al was synthesized 2 O 3 -SiO 2 -TiO 2 After the composite carrier, the PdPt metal component is impregnated in equal volume on the composite carrier to prepare PtPd / Al 2 O 3 -SiO 2 -TiO 2 The catalyst, wherein the mass fraction of Pd is 0.3-0.6%, the mass fraction of Pd is 0.1-0.2%, and the order of impregnation is Pt first and then Pd. The preparation method is: the metal salt used is chloroplatinic acid (H 2 PtCl 6 6H 2 O) and palladium chloride (PdCl 2 ), first add a certain amount of chloroplatinic acid (H 2 PtCl 6 6H 2 O) and PdCl 2 Dissolve in 0.2mol / L dilute hydrochloric acid to prepare a co-impregnation solution, and use the co-impregnation method to obtain PtPd / Al 2 O 3 -SiO 2 -TiO 2 Double precious metal catalyst precursor, after impregnating the metal active component, the catalyst precursor is placed in an ultrasonic oscillator for ultrasonic dispersion for 20 minutes, then dried at 110°C for 12 hours, and then...
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