Titer temperature distribution

Figure 3.62 Horizontal and vertical temperature distribution in the titer-plate (11 wells shown) [38] (by courtesy of VDI-Verlag GmbH).

One problem with the use of acetylene is its stability. Although it is stable at normal pressures and temperatures, if it is subjected to pressures as low as 15pounds per square inch gauge (psig) it can explode. To minimize the stability problem, acetylene transport is minimized. Acetylene contained in pressurized cylinders for welding and cutting is dissolved in acetone. A typical acetylene cylinder contains a porous filler made from a combination of materials such as wood chips, diatomaceous earth, charcoal, asbestos, and Portland cement. Synthetic fillers are also available. Acetone is placed in the cylinder and fills the voids in the porous material. Acetylene can then be pressurized in the cylinders up to approximately 250 pounds per square inch (psi) In a pressurized cylinder, 1 titer of filler can hold a couple of hundred titers of acetylene, which stabilizes it. Acetylene cylinders should not be stored on their sides because this could cause the acetone to distribute unequally and create acetylene pockets. 

Another reactor for fast catalyst testing is a modular microstructured device with up to 10 catalysts applied on titer plates. An advantage of this reactor is the composition of various modules such as flow distribution, reaction heat exchange and gas sampling, which can be interconnected in different ways. The reactor can be operated at maximum pressure and temperature of 30 bar and 600 °C in the reaction module, and flow rates up to 10 mL min are possible. Catalyst deposition can be carried out very rapidly by a sputtering method or by washcoating, which has already been tested for the oxidation of methane [107, 108]. 

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