Abstract: Dimethyl ether is converted to formaldehyde using a supported catalyst comprising molybdenum and/or vanadium oxides. The surface density of the oxide(s) ranges from greater than that for the isolated monomeric oxides upwards, so long as there is a substantial absence of bulk crystalline molybdenum and/or vanadium oxide(s). Conversion and selectivity to formaldehyde are improved as compared to data reported for known catalysts. Also disclosed is a catalyst comprising molybdenum and/or vanadium oxides supported on a layer of stannic oxide that is disposed on the surface of a particulate alumina or zirconia support.
Type:
Application
Filed:
February 20, 2002
Publication date:
September 4, 2003
Applicant:
Regents of the University of California Office of Technology Licensing
Abstract: A technique for fabricating substrates such as a silicon-on-insulator substrate using a plasma immersion ion implantation (“PIII”) system 10. The technique includes a method, which has a step of providing a substrate 2100. Ions are implanted 2109 into a surface of the substrate to a first desired depth to provide a first distribution of the ions using a plasma immersion ion implantation system 10. The implanted ions define a first thickness of material 2101 above the implant. Global energy is then increased of the substrate to initiate a cleaving action, where the cleaving action is sufficient to completely free the thickness of material from a remaining portion of the substrate. By way of the PIII system, the ions are introduced into the substrate in an efficient and cost effective manner.
Type:
Application
Filed:
May 18, 2001
Publication date:
May 30, 2002
Applicant:
The Regents of the University of California Office of Technology Licensing
Inventors:
Nathan W. Cheung, Xiang Lu, Chenming Hu