Catalyst support
View Patent ↗A catalyst support is produced by mixing particulate synthetic silica with 0.5–10 parts by weight of one or more particulate oxides or phosphates of the elements of group IIA, IIIB, IVB, VA, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and lanthanides or precursors thereof, shaping the mixture and then calcining the shaped mixture to form the finished support. The formed support has improved stability relative to aging resistance under hydrothermal conditions. The catalyst support is used together with phosphoric acid in the production of alcohols from olefins by hydration. The resultant hydration catalysts have excellent activity and selectivity.
1. A catalyst support comprising synthetic silica, with 0.5–10 parts of one or more oxides or phosphates of the elements of group IIA, IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and the lanthanides, whereby the support is prepared by mixing particulate synthetic silica with particulate oxides or phosphates of the elements of Groups IIA, IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and the lanthanides, or with precursors thereof, shaping and calcining to form a finished support having particulate oxide or phosphate domains.
2. The catalyst support according to claim 1 , wherein the oxides or phosphates of the elements include titania and/or zirconium dioxide.
3. A process for the preparation of a catalyst support according to claim 2 , which comprises:
mixing particulate silica, with 0.5 to 10 parts by weight of particulate titania and/or
zirconium dioxide or with precursors thereof, based on the total weight of the support, prior to the forming step;
a forming step and calcining the formed material betwen 400 and 1050° C.
4. The catalyst support according to claim 1 , wherein the content of synthetic silica in the calcined support is at least 80% by weight based on the total weight of the support.
5. The catalyst support according to claim 1 wherein the synthetic silica comprises pyrogenically produced silica.
6. The catalyst support according to claim 1 wherein the synthetic silica consists entirely of pyrogenically produced silica.
7. The catalyst support according to claim 1 wherein the titania comprises pyrogenically produced titania.
8. The catalyst support according to claim 1 wherein the titania consists entirely of pyrogenically produced titania.
9. The catalyst support according to claim 1 wherein the titania comprises precipitated titania.
10. The catalyst support according to claim 1 wherein the titania consists entirely of precipitated titania.
11. The catalyst support according to claim 1 wherein the zirconium dioxide comprises pyrogenically produced zirconium dioxide.
12. The catalyst support according to claim 1 wherein the zirconium dioxide consists entirely of pyrogenically produced zirconium dioxide.
13. The catalyst support according to claim 1 , wherein the domains are titania and/or zirconium dioxide.
14. The catalyst support according to claim 1 , wherein the domains are distributed throughout the support.
15. A process for the preparation of a catalyst support according to claim 1 , which comprises mixing particulate synthetic silica with 0.5 to 10 parts by weight of particulate oxides or phosphates of the elements of Groups IIA, IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and the lanthanides, or with precursors thereof, based on the total weight of the support, prior to the forming step, forming and calcining between 400 and 1050° C.