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The present invention relates to a process for the production of alkyl tertiary aldehydes by reacting olefins with hydrogen sulfide in the presence of a supported catalyst containing Co, Mo and W and in the presence of at least one other catalyst component, wherein the supported catalyst has a specific support structure and a specific process temperature and the at least one other catalyst component is present in the reaction zone in a specific amount and is derived from an olefinic hydrocarbon with a specific carbon chain length. In various chemical processes involving the formation of organic compounds, such as alkyl tertiary aldehydes, by the reaction of olefins and hydrogen sulfide in the presence of a catalyst, the reaction products are subjected to a distillation step in order to obtain the desired product. Thus, in the case of the production of ethyl tertiary aldehyde, there is the formation of byproducts, such as propenal, which can be separated off by distillation from the desired product, ethyl tertiary aldehyde. The latter is recovered from the distillation column, e.g. by absorption in a solvent or by azeotropic distillation and the distillation column is refluxed with fresh hydrogen sulfide. The latter condenses and is recycled to the reactor. The distillation step requires a great deal of energy, in particular for the cooling of the effluent and the condensation of the product to be recovered. Moreover, the hydrogen sulfide added in excess for the recovery of the product is recovered from the bottoms of the distillation column in the form of impurities, which can be worked up only with very high expense. The object of the present invention is to avoid the disadvantages described above and to provide a process for the production of alkyl tertiary aldehydes by reacting olefins with hydrogen sulfide in the presence of a supported catalyst containing Co, Mo and W and in the presence of at least one other catalyst component, which is simple to carry out and which is effective without producing impurities. We have found that this object is achieved by a process for the production of alkyl tertiary aldehydes by reacting olefins with hydrogen sulfide in the presence of a supported catalyst containing Co, Mo and W and in the presence of at least one other catalyst component, wherein the supported catalyst has a specific support structure and a specific process temperature and the at least one other catalyst component is
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