Catalyst and method for producing polytetrahydrofurane

Details Catalyst and method for producing polytetrahydrofurane Catalyst and method for producing polytetrahydrofurane

2005-03-22

2005-03-22

Nguyen, Cam N. (Department: 1754)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S091000, C526S266000, C526S268000, C526S270000, C526S271000, C502S254000, C502S255000, C502S305000, C502S308000, C502S309000, C502S321000, C502S349000, C502S350000, C502S439000

Reexamination Certificate

active

06870014

ABSTRACT:
The invention relates to a catalyst which contains a catalytically active quantity of at least one oxygen-containing molybdenum and/or wolfram compound on an oxidic support material and which has been calcinated at temperatures of 400 to 900° C. after the precursor compound of the catalytically active compounds have been applied to the support material or to a support material precursor. The transport pores for this catalyst each have a diameter of >25 nm and a volume of at least 50 mm3/g. The catalyst contains x μmol (wolfram and/or molybdenum)/m2molybdenum and/or wolfram, with 10.1<x<20.9 in relation to the finished catalyst, with the oxidic support material having a BET surface area of 135 to 220 m2/g. Catalysts of this type are characterized by an acidity of at least 70 μmol/g at pKs<−3 in the dry state and are therfore very active. The invention also relates to a method for producing a catalyst of this type and to the preferred use thereof.

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