Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2011-06-14
2011-06-14
Oh, Taylor Victor (Department: 1622)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S066000, C502S074000, C502S087000, C502S179000, C502S214000
Reexamination Certificate
active
07960308
ABSTRACT:
The invention provides a process which enables, in preparation of acrolein by catalytic gas-phase oxidation of propylene in the presence of molecular oxygen or a molecular oxygen-containing gas or in preparation of acrylic acid by catalytic gas-phase oxidation of acrolein in the presence of molecular oxygen or a molecular oxygen-containing gas, using single kind of atalyst, to suppress occurrence of localized extraordinarily high temperature spots (hot spots) in the catalyst layer and can stably maintain high acrolein or acrylic acid yield for a long time. The process is characterized by use of an oxide catalyst containing molybdenum as an essential component and having relative standard deviation of its particle size in a range of 0.02 to 0.20.
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Partial English translation of Notice of Reasons for Rejection dated Apr. 14, 2009 issued for Japanese Application No. 2007-294353 corresponding to present U.S. application.
European Search Report issued Sep. 15, 2010 in corresponding European Application No. 08005787.
J. Kunert et al., “Synthesis of Mo/V Mixed Oxide Catalysts Via Crystallisation and Spray Drying—A Novel Approach for Controlled Preparation of Acrolein to Acrylic Acid Catalysts,” Applied Catalysis, (2004) vol. 269, pp. 53-61.
Nippon Shokubai Co. , Ltd.
Oh Taylor Victor
Wenderoth , Lind & Ponack, L.L.P.
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