首页>
外国专利>
method for treating raw smeerolien with hydrogen under the influence of a catalyst, the metal of the ijzergroep and a group vi of the periodic system.a halogen and an alumina on medium contains.
method for treating raw smeerolien with hydrogen under the influence of a catalyst, the metal of the ijzergroep and a group vi of the periodic system.a halogen and an alumina on medium contains.