Showing papers by "James C. Vartuli published in 1999"
TL;DR: In this article, a microcalorimetry was conducted on various solid acid tungsten/zirconia catalysts prepared by different techniques, and the results showed that the acid site strength of the tengstzircania materials is similar to or slightly higher than that found in zeolites or sulfated zirconias and is comparable to sulfuric acid.
92 citations
TL;DR: In this paper, a Pt-modified Wox/ZrO2 catalyst system is found to undergo various transformations in the presence of hydrogen, including the generation of spillover hydrogen at room temperature, the development of a strong Pt-W interaction at elevated temperatures, and tungsten reduction.
67 citations
Patent•
04 Oct 1999TL;DR: In this article, a method of synthesizing an olefin epoxidation catalyst comprises the step of treating a porous crystalline aluminosilicate material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9± 0.15, 3.57±0.07 and 3.42± 0.07 Angstrom, such as MCM-22, with a dealuminating agent under conditions effective to remove framework aluminum from the material and produce the dealuminated product.
Abstract: A method of synthesizing an olefin epoxidation catalyst comprises the step of treating a porous crystalline aluminosilicate material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07 Angstrom, such as MCM-22, with a dealuminating agent under conditions effective to remove framework aluminum from the material and produce a dealuminated product. The dealuminated product is then treated with a titanium-containing material under conditions effective to insert titanium into the dealuminated product and produce a titanium-containing, dealuminated catalyst composition. The resultant catalyst is useful in the epoxidation of olefins, such as propylene and cyclohexene, and hydrogen peroxide and organic hydroperoxides.
28 citations
Patent•
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TL;DR: In this article, a process for producing phenol and acetone from cumene hydroperoxide is described, in which a solid-acid catalyst comprising a sulfated transition metal oxide, preferably sulfated zirconia, is used.
Abstract: A process for producing phenol and acetone from cumene hydroperoxide is described in which the cumene hydroperoxide is contacted with a solid-acid catalyst comprising a sulfated transition metal oxide, preferably sulfated zirconia.
25 citations
Patent•
20 Jul 1999TL;DR: A novel synthesis composition of a solid acid containing zirconium, in addition to a rare earth element, such as cerium, has the potential for catalytic conversions of hydrocarbons, especially for isomerization of paraffins, ring opening of cyclics, hydrocracking, alkylation, hydrogenation of polynuclear aromatics, selective catalytic reduction of nitrogen oxides, and oligomerisation of light olefins.
Abstract: A novel synthesis composition of a solid acid containing zirconium, in addition to a rare earth element, such as cerium, has the potential for catalytic conversions of hydrocarbons, especially for isomerization of paraffins, ring opening of cyclics, hydrocracking, alkylation, hydrogenation of polynuclear aromatics, selective catalytic reduction of nitrogen oxides, and oligomerization of light olefins.
14 citations