Method of preparing an alumina catalyst support and catalyst for dehydrogenation reactions, and its use
A technology of dehydrogenation catalyst and catalyst carrier, which is applied in the field of catalysts for converting hydrocarbons, and can solve the problems such as the inability to use dehydrogenation reaction
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[0036] Table 1
[0037] raise the temperature
temperature rise rate
Soak time at final temperature
25-100℃
2-20°C / min (preferably 5°C / min)
0.5-5 hours (preferably 1 hour)
100-150℃
5°C / min
1 hour
150-340℃
10°C / min
0 hours
340-350℃
1°C / min
1 hour
350-490℃
10°C / min
0 hours
490-800℃
10°C / min
5 hours
[0038] After calcination, the calcined catalyst support is allowed to cool (eg, room temperature).
[0039] The formed catalyst support may then be treated with the dehydrogenation catalyst component such that the final treated catalyst support comprises the dehydrogenation catalyst component to form the final catalyst. The dehydrogenation catalyst component is meant to include those materials having catalytic activity, as well as those materials which may constitute promoters which promote the activity of the catalyst. This can include one or more different elements....
Embodiment 1
[0067] Various catalyst supports (samples A-G) were prepared using different preparation techniques with different compression pressures, calcination temperatures and calcination gases. For each support, bayerite aluminum hydroxide (Al(OH) 3 ) powder was mixed with a sufficient amount of deionized water to form a paste, which was then used to form samples A-G.
[0068] For sample G, boron (B), such as boric acid, was also mixed with bayerite aluminum hydroxide and water in an amount to provide 0.1 mole percent boron based on the total moles of boron oxide and alumina on the final support. The paste in each sample was dried and powdered to make tablets. After tableting, the tablets were dried and calcined at different temperatures in different calcination gases with a soaktime of 5 hours in the calcination gases at the final calcination temperature. Table 2 below lists the different conditions used in forming each sample.
[0069] Table 2
[0070] sample
Calcin...
Embodiment 2
[0083] Support Examples A, E, F, and G from Example 1 were used to form Catalysts A, E, F, and G, respectively, where Catalysts E, F, and G constituted comparative catalysts. Each support was treated using the process outlined in the detailed description to provide the dehydrogenation catalyst components Pt, Sn, Ni, P, Ca, and Cl in the same amounts on the support to form the dehydrogenation catalyst, Catalyst A and Comparative Catalyst E, F and G. The components in Table 4 below were used to impregnate the support.
[0084] Table 4
[0085]
[0086]
[0087] The catalyst had an average metal concentration of 0.72 wt% Pt, 2.55 wt% Sn, 0.28 wt% Ni, 1.17 wt% P, 1.50 wt% Ca, and 0.27 wt% Cl.
[0088] Each catalyst was then used in the dehydrogenation of propane to form propylene under the same catalyst loading and under the same conversion level and process conditions at 595°C. For each support of Catalysts A, E, F and G, image 3 The conversion, selectivity and time of...
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