Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Reexamination Certificate
2005-06-21
2005-06-21
Nguyen, Cam N. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
C502S263000, C502S351000, C502S355000, C502S407000, C502S414000, C502S415000, C502S439000, C501S073000, C501S133000, C501S134000, C501S153000, C501S154000, C423S327100, C423S335000, C423S598000, C423S600000
Reexamination Certificate
active
06908879
ABSTRACT:
A ceramic article is disclosed which contains aluminum, silicon, and titanium in a total amount of at least 99% by weight as reduced to the oxides (Al2O3+SiO2+TiO2) and assumes an acidic color in methyl red, an indicator of at least pKa+4.8. It can be used as a carried for a catalyst. This ceramic article is obtained by mixing an aluminum compound, a silicon compound, and a titanium compound and calcining the resultant mixture at a temperature in the range of 1,000°-2,000° C. A catalyst for preparing ethylene oxide is obtained by depositing silver and a reaction promoter on the ceramic carrier and ethylene oxide is obtained by oxidizing ethylene with a molecular oxygen-containing gas in the presence of the catalyst in vapor phase.
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Tanabe et al., “Acid Base Catalysts”, Sangyo Tosho K.K. 160-163 and 176, Apr. 28, 1996, English Translation.
Shima Masahide
Takada Hitoshi
Fish & Richardson P.C.
Nguyen Cam N.
Nippon Shokubai Co. , Ltd.
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