摘要:
An extrudate comprising titania, a carboxyalkyl cellulose, and a hydroxyalkyl cellulose is disclosed. The extrudates have a smooth outer surface when they exit the extruder. The extrusion processibility is improved.
摘要:
A catalyst comprising palladium supported on a titania-alumina extrudate is disclosed. The extrudate comprises at least 80 wt% titania and 0.1 to 15 wt% alumina. A palladium catalyst prepared from the titania-alumina extrudate has significantly higher crush strength. Its catalytic performance in vinyl acetate production is improved.
摘要:
A method for preparing a palladium-gold catalyst containing a titania extrudate is disclosed. The titania extrudate is produced by using a carboxyalkyl cellulose and a hydroxyalkyl cellulose as extrusion aids. The titania extrudate has improved processibility and/or mechanical properties. After calcination, the extrudate is used as a carrier for the palladium-gold catalyst. The catalyst is useful in producing vinyl acetate by oxidizing ethylene with oxygen in the presence of acetic acid.
摘要:
Disclosed is a catalyst. The catalyst comprises palladium, gold, and a support comprising titanium dioxide and tungsten trioxide. The support preferably comprises from 75 wt% to 99 wt% of titanium dioxide and from 1 wt% to 25 wt% of tungsten trioxide. A method for preparing the catalyst is also disclosed. The method comprises impregnating the support with a palladium compound and a gold compound, calcining the impregnated support, and then reducing the calcined support. Further disclosed is a method for preparing vinyl acetate with the catalyst. The catalyst exhibits improved catalytic activity and selectivity.