Catalytic Applications of Mesoporous Metallosilicate Molecular Sieves and Method for Their Preparation
Catalysis of larger molecules would proceed more quickly with larger pores that would allow for more flux into and out of the pores. In addition, one of the most important methods for converting hydrocarbons to useful industrial chemical, intermediates, and pharmaceuticals is catalytic oxidation. Current oxidation routes result in large quantities of waste pollutants that are extremely difficult to dispose of and too expensive to recycle.
Description of Technology
This technology can catalytically oxidize or hydroxylate organic compounds within its mesoporous metallosilicate material. The molecular sieve is comprised of a transition-metal-substituted-silicate and has larger pores, which can more aptly support catalytic peroxide oxidation of larger substituted aromatic compounds.
The porous material is prepared by a neutral templating process, and the pore size is predetermined by the appropriate neutral template (selected chemicals). The process includes preparing a neutral precursor solution (alkoxides) and aging it in the presence of a neutral, or non-ionic template solution. Typically, one would react an aged silicon (or metal) alkoxide solution with a template solution, recover the template agent, and calcine (heat to dry or decompose) the product to yield the oxide form.
- Faster catalytic oxidation: Small mesopores provide for rapid peroxide hydroxylation of benzene and oxidation of substituted aromatics compared to slower kinetic diameters of conventional, smaller micropores.
- Lowers costs: The templating agent can be recovered and recycled.
- Integrable: Uses relatively mild conditions and conventional processing steps.
Most any industrial scale for catalytic oxidation of large molecules and in treating waste water, sludge, industrial waste, or in chemical synthesis of petroleum and petrochemicals.
The invention is ready for a pilot production scale-up effort.
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Thomas Pinnavaia, Peter Tanev, Ying Liang, Malama Chibwe, Wenzhong Zhang, Jialiang Wang
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Michigan State University