Reactor scanning mass spectrometer

Micro structured wells (2 mm x 2 mm x 0.2 mm) on the catalyst quartz wafer were manufactured by sandblasting with alumina powder through steel masks [7]. Each well was filled with mg catalyst. This 16 x 16 array of micro reactors was supplied with reagents by a micro fabricated gas distribution wafer, which also acted as a pressure restriction. The products were trapped on an absorbent plate by chemical reaction, condensation or absorption. The absorbent array was removed from the reactor and sprayed with dye solution to obtain a color reaction, which was then used for the detection of active catalysts by a CCD camera. Alternatively, the analysis was also carried out with a scanning mass spectrometer. The above-described reactor configuration was used for the primary screening of the oxidative dehydrogenation of ethane to ethylene, the selective oxidation of ethane to acetic acid, and the selective ammonoxidation of propane to acrylonitrile. 

Major centers and facilities provide key infrastructure and capabilities for conducting research and have provided the foundation for U.S. leadership. Key capabilities for chemistry research include advanced light sources, scanning probe instruments, supercomputers, very high field nuclear magnetic resonance spectrometers, advanced mass spectrometers, nuclear reactors and accelerators, and specialized facilities for chemical biology. 

Temperature scanning (TS) made it possible to complete an experimental study of the kinetics of this reaction on one catalyst, at one pressure and feed composition, in less than one working day of reactor operation. Real-time measurements of CO conversion were done using a quadrupole mass spectrometer. 

Qmdntpole Ion Trap with an External Thermionic Source By the use of mass-selective instabihty experiments, the ion trap mass spectrometer serves as both a reactor in which ion/molecule reactions occur, and a mass analyzer for the products of these reactions. The analytical use of ion trap mass spectrometers relies upon the method of ramping the radio frequency (RF) drive potential. The capabilities of ion traps to perform attachment reactions with alkali cations using classical scanning sequences have been exploited. Kinetic studies have shown that, the attachment efficiency is very high, near-collision efficiency, and illustrate how the present method is particularly well suited for ion trap mass spectrometers. Control of the attachment process may be readily performed by the use of a classical ionization sequence in some aspects similar to a tandem MS/MS scanning sequence. 

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