Abstract: The invention relates to a process for the catalytic decomposition of N2O to N2 and O2. This process is carried out at a high temperature, generally of between 700 and 1 000° C., at a high HSV and in the presence of a catalyst composed of a mixed oxide of zirconium and of cerium existing in the form of a solid solution.

Abstract: A catalyst for reducing the nitrous oxide content in gas, which operates at relatively low temperatures, the activity of which is relatively insensitive to the presence of water vapor and which is highly resistant to hydrothermal degradation, is prepared from ferrierite exchanged with iron. Application to the treatment of gases with a low N2O content, such as gases resulting from plants for the manufacture of nitric acid, and of gases with a high N2O content, which are emitted during oxidations of organic compounds by nitric acid.

Abstract: A process and catalyst for reducing the nitrous oxide content in gas, which operates at relatively low temperatures, the activity of which is relatively insensitive to the presence of water vapour and which is highly resistant to hydrothermal degradation, is prepared from ferrierite exchanged with iron. Application to the treatment of gases with a low N2O content, such as gases resulting from plants for the manufacture of nitric acid, and of gases with a high N2O content, which are emitted during oxidations of organic compounds by nitric acid.

Abstract: This invention relates to devices and methods for carrying out multi-step and multiplex immunoaffinity binding reactions in microscopic formats. In particular, these devices and methods allow the user to rapidly carry out multiple immunoassays in the same sample volume, and to rapidly resolve the results of those immunoassays in an electronically assisted format. The assays may be further multiplexed in that several samples may be analyzed and visualized on the same microelectronic array.

Abstract: A procedure wherein a catalyst pertaining to the family of zeolites is injected into the vessel (1) of the circulating fluidized bed, in powder form. The installation includes a vessel (1) in which the top is connected to a separator (3) in which the bottom is connected to the vessel (1) by a recirculation loop (4), a silo (5), in which the catalyst based on crushed zeolites is stored, and which is connected by a conveyer (6) to the recirculation loop (4).

Abstract: The invention concerns a catalyst, in particular for reducing NO.sub.x, using methane or any mixture containing mostly methane. The catalyst consists of a zeolite of mordenite structure with "small pores" exchanged with Pd and/or Co. The invention is useful for reducing nitrogen oxides.

Abstract: The invention relates to a method of manufacture of carbon black by pyrolysis of rubber waste previously ground and from which the scrap has been removed. With this method, pyrolysis is carried out in the presence of at least one gas selected from water vapour, carbon dioxide, a combustion gas or a mixture of water vapour and at least one inert gas.

Abstract: The invention concerns novel zeolite Y containing catalyst compositions and the use thereof for the treatment of oxygenated effluents containing nitrogen oxides. The invention further concerns the preparation of such novel zeolite Y containing catalyst compositions.

Abstract: A process of speech synthesis by the domain overlap-addition of elements stored in a dictionary as waveforms, comprises supplying a sequence of phoneme codes and respective prosodic information, and, for each phoneme, analyzing and synthesizing each phoneme, and then concatenating the synthesized phonemes. For each phoneme, two diphones are selected among the stored diphones and the presence of voicing is determined. For voiced phonemes, the respective waveforms of the two diphones constituting the phoneme are filtered by a window which is centered on a point of the selected waveform representative of the beginning of a pulse response of vocal cords to excitation thereof. The window has a width substantially equal to twice the greater of the original fundamental period or the fundamental synthesis period and has an amplitude progressively decreasing from the center of the window.

Abstract: Catalytic compositions based on zeolite Y for use in the treatment of oxygenated effluents containing NO.sub.x, comprising 70 to 90% of zeolite NH.sub.4 Y having a specific surface between 750 and 950 m.sup.2 /g exchanged to cupric ions, wherein the copper content is between 2 and 12% relative to the weight of the zeolite; and 10 to 30% of a binder are disclosed. Processes for the preparation of such catalytic compositions are also disclosed.

Abstract: A process of speech synthesis from diphones stored in a dictionary as waveforms, for text-to-speech conversion, comprises supplying a sequence of phoneme codes and respective prosodic information, and, for each phoneme, analyzing and synthesizing each phoneme, and then concatenating the synthesized phonemes. For each phoneme, two diphones are selected among the stored diphones and the presence of voicing is determined. For voiced phonemes, the respective waveforms of the two diphones constituting the phoneme are filtered by a window which is centered on a point of the selected waveform representative of the beginning of a pulse response of vocal cords to excitation thereof. The window has a width substantially equal to twice the greater of the original fundamental period and the fundamental synthesis period and has an amplitude progressively decreasing from the center of the window.

Abstract: A catalytic composition for selective reduction of nitrogen oxides comprising, as active material, mordenite in ammonium or acid form, with a residual sodium content less than 1000 ppmw, representing 70 to 95% of the total weight of the catalytic composition, the remainder comprising a binder. The active material can also be in the form of small-pore mordenite exchanged with copper ions.The catalytic composition can be used for the purification of effluents with containing any nitrogen oxide, in particular for depolluting residual gases rejected into the atmosphere during the production of nitric acid.

Abstract: Conversion of the synthetic gas mixtures: carbon monoxide - hydrogen or carbondioxide - hydrogen is carried out in the presence of a catalyst constituted by the association of at least two transition metal elements with an acitve mordenite selected from among de-aluminized acid mordenites. The metal elements can be copper, zinc and chromium. The transition metal elements - active mordenite association can be employed in separate catalytic beds, the first bed being metallic in nature and the second zeolitic in nature. The process is applicable to the manufacture of organic products such as saturated and unsaturated hydrocarbons, particularly light olefines.

Abstract: Production of unsaturated hydrocarbons of 2-5 carbon atoms from methanol in the presence of zeolitic catalysts is effected by introducing gaseous methanol into a carrier gas, the concentration of the methanol in the entering mixture being between 5 and 60% by volume, and passing the mixture through a catalytic bed based on synthetic mordenite of the so-called de-aluminized type whose Si/Al ratio (atomic) is higher than 80, the flow rate of the methanol being between 1 and 5 liters of liquid methanol per liter of catalyst and per hour. The reaction is carried out at a temperature between 350.degree. and 550.degree. C., under a pressure which can reach 20 bars. The de-aluminized synthetic mordenite is prepared by subjecting the mordenite to a series of alternate acid and hydrothermic treatments, the said series commencing with an acid treatment and terminating with an acid treatment.

Abstract: A catalyst for implementing a process for manufacturing amines from alcoh is composed of an active element in the transition metals family uniformly combined with a refractory porous structure with a specific surface of between 10 and 300 m.sup.2 /g and with a pore diameter less than 5000 A. A stabilizer in the form of a sodium-based compound with a sodium content of 0.15 to 20% by weight relative to the weight of the catalyst, and a promoter in the form of a rhodium-based compound with a maximum rhodium content of 0.1% by weight relative to the weight of the catalyst, may be associated with the active metal. The catalyst and the process are applicable to the ethanolamine-ammonia reaction with a view to producing ethylenediamine, piperazine, and useful byproducts.