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US 9,174,200 B2Granted
Process for preparation of Ag—W oxide catalyst for the selective conversion of propylene to propylene oxide with molecular oxygen
AssigneeCouncil of Scientific and Industrial Research
InventorsRajaram Bal, Shilpi Ghosh, Shubhra Acharyya Shanka, Bipul Sarkar, Chandrashekar Pendem, Rajib Kumar Singha
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Abstract
The present invention provides a process for preparation of Ag—W oxide catalyst for the direct and selective conversion of propylene to propylene oxide. The process provides a direct single step selective vapor phase oxidation of propylene to propylene oxide using molecular oxygen over Ag—W oxide catalysts. The process provides propylene conversion of 10-50% and selectivity for propylene oxide up to 100%.
Claims10
A process for the preparation of Ag—W oxide catalyst, said process comprising the steps of:
- a. mixing a salt of Ag, WO3.2H2O, a surfactant, a reducing agent hydrazine and H2O to obtain a gel;
- b. mixing gel as obtained in step (a) with constant stirring for 2-6 h at room temperature ranging between 25-35° C.;
- c. filtering the gel as obtained in step (b) and washing with excess water and dried in an oven with temperature ranging between 100-120° C. for a period ranging between 6-18 hours;
- and
- d. calcining the dried product as obtained in step (c) at temperature ranging between 300-750° C. for a period ranging between 4-10 h to obtain Ag—W oxide catalyst.
2 more elements
Dependencies are inferred from the claim text.