Alumina having bimodal pore structure, catalysts made therefrom and processes using same
AssigneeShell Oil Company
InventorsJosiane M. Ginestra, Russell C. Ackerman, Christain G. Michel
Life of this patent
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Abstract
Alumina having a pore structure characterized by the absence of macropores, no more than 5% of the total pore volume in pores greater than 350 Å, a high pore volume (greater than 0.8 cc/g measured by mercury intrusion) and a bi-modal pore volume distribution character, where the two modes are separated by 10 to 200 Å, and the primary pore mode is larger than the median pore diameter (MPD), calculated either by volume or by surface area, the MPD by volume being itself larger than the MPD by surface area. Also provided are catalysts made from and processes using such alumina.
Claims33
A catalyst support comprising an alumina extrudate characterized by having:
- no more than 5% of its total pore volume in pores having a diameter greater than 350 Å;
- a total pore volume greater than 0.8 cc/g measured by mercury intrusion;
- and
- a bi-modal pore volume distribution having a primary and a secondary mode, wherein
- the primary mode exhibits a higher maximum than the secondary mode;
- the primary and secondary modes are separated by at least about 10 Å and by as much as about 200 Å;
- the primary pore mode occurs at a pore diameter greater than the median pore diameter (“MPD”), calculated either by volume (“MPDV”) or by surface area (“MPDSA”);
- and
- the MPDV is larger than the MPDSA.
A catalyst composition comprising at least one catalytically active metal selected from the group consisting of metals, metallic oxides, metallic sulfides, and mixtures thereof and a catalyst support comprising an alumina extrudate characterized by having:
- no more than 5% of its total pore volume in pores having a diameter greater than 350 Å;
- and
- a bi-modal pore volume distribution having a primary and a secondary mode, wherein
- the primary mode exhibits a higher maximum than the secondary mode;
- the primary and secondary modes are separated by at least about 10 Å and by as much as about 200 Å;
- the primary pore mode occurs at a pore diameter greater than the median pore diameter (“MPD”), calculated either by volume (“MPDV”) or by surface area (“MPDSA”);
- and
- the MPDV is larger than the MPDSA.
Dependencies are inferred from the claim text.