Process for testing catalyst samples in parallel and to which reactant gas(es) are sent in turn to test involves using transient kinetic methods

摘要

A perturbed flow of reactant gas is sent to each sample tested, using an impulse flow is sent to each sample under vacuum. There are means (6, 14, 16) of allowing a flow to be directed to each sample so they can be tested using transient kinetic methods. The sample receivers (20) are placed under vacuum. Process for evaluating the characteristics of catalysts in which different catalyst samples are placed in parallel and tested one after another involves using transient kinetic methods. The impulse lasts less than 10ms, preferably less than 1ms, and each sample is at a pressure less than 10mbar, preferably less than 1mbar. All the samples undergo a single pre-treatment phase simultaneously. The impulse is sent to a given sample whilst the other samples are at rest. After the reactant gas is sent to the sample, it is sent to a single analysis device. Each sample receives a first reactant gas and then a second replacement reactant gas at a pressure more than or equal to atmospheric pressure. The second gas is an isotope of the first gas. Whilst one sample is supplied with the first or the second gas, the other samples are supplied with the second or the first gas. An Independent claim is included for an installation to carry out the above process, with receivers (20) for a number of samples of catalyst, arranged in parallel. Means of creating an impulsive flow (16) are connected to means of supply (14), which are in turn connected in a selective fashion to means of distribution (30) which open into the receivers. A single supply line feeds a valve with many outlets, each of which is in communication with the corresponding means of distribution, which can be connected selectively to the supply line. The feed valve also has a pre-treatment inlet which can be connected to all the outlets to the valve except the one connected to the supply line. The receiver under vacuum is an annular reactor with a number of positions hollowed out in it for the samples. It has a single outlet connected to an analyzer.