A process for preparing a tin-containing zeolitic material having framework type BEA, comprising (i) providing a zeolitic material having framework type BEA wherein the framework comprises B 2 O 3 and SiO 2, wherein said framework has vacant tetrahedral framework sites; wherein according to (i), the zeolitic material having framework type BEA having vacant tetrahedral framework sites is provided by a method comprising (i.1) providing a zeolitic material having framework type BEA, wherein the framework of the zeolitic starting material comprises B 2 O 3 and SiO 2 and the molar ratio B 2 O 3: SiO 2 is greater than 0.02: 1; (i.2) creating vacant tetrahedral framework sites by treating the zeolitic material provided in (i.1) with a liquid solvent system, obtaining a zeolitic material having a molar ratio B 2 O 3: SiO 2 of at most 0.02: 1, wherein the liquid solvent system does not contain an inorganic acid and an organic acid and a salt thereof wherein the liquid solvent system is selected from the group consisting of water, monohydric alcohols, polyhydric alcohols, and mixtures of two or more thereof; (ii) providing a liquid aqueous mixture comprising a tin-ion source and an acid, wherein the tin-ion source according to (ii) is one or more of tin salts of organic acids having from 1 to 6 carbon atoms, wherein the acid comprised in the liquid aqueous mixture provided in (ii) is one or more organic acids; (iii) preparing a mixture of the zeolitic material provided in (i) and the aqueous mixture provided in (ii) obtaining a tin-containing zeolitic material having framework type BEA, wherein the ratio of the volume of the aqueous mixture divided by the mass of the zeolitic material, in cm 3 /g, to the TPV is in the range of from 0.1:1 to 1.7:1, wherein the TPV is the total pore volume of the zeolitic material in cm 3 /g as determined by nitrogen absorption according to DIN 66134; (iv) drying the zeolitic material obtained from (iii). (i) providing a zeolitic material having framework type BEA wherein the framework comprises B 2 O 3 and SiO 2, wherein said framework has vacant tetrahedral framework sites; wherein according to (i), the zeolitic material having framework type BEA having vacant tetrahedral framework sites is provided by a method comprising (i.1) providing a zeolitic material having framework type BEA, wherein the framework of the zeolitic starting material comprises B 2 O 3 and SiO 2 and the molar ratio B 2 O 3: SiO 2 is greater than 0.02: 1; (i.2) creating vacant tetrahedral framework sites by treating the zeolitic material provided in (i.1) with a liquid solvent system, obtaining a zeolitic material having a molar ratio B 2 O 3: SiO 2 of at most 0.02: 1, wherein the liquid solvent system does not contain an inorganic acid and an organic acid and a salt thereof wherein the liquid solvent system is selected from the group consisting of water, monohydric alcohols, polyhydric alcohols, and mixtures of two or more thereof; (i.1) providing a zeolitic material having framework type BEA, wherein the framework of the zeolitic starting material comprises B 2 O 3 and SiO 2 and the molar ratio B 2 O 3: SiO 2 is greater than 0.02: 1; (i.2) creating vacant tetrahedral framework sites by treating the zeolitic material provided in (i.1) with a liquid solvent system, obtaining a zeolitic material having a molar ratio B 2 O 3: SiO 2 of at most 0.02: 1, wherein the liquid solvent system does not contain an inorganic acid and an organic acid and a salt thereof wherein the liquid solvent system is selected from the group consisting of water, monohydric alcohols, polyhydric alcohols, and mixtures of two or more thereof; (ii) providing a liquid aqueous mixture comprising a tin-ion source and an acid, wherein the tin-ion source according to (ii) is one or more of tin salts of organic acids having from 1 to 6 carbon atoms, wherein the acid comprised in the liquid aqueous mixture provided in (ii) is one or more organic acids; (iii) preparing a mixture of the zeolitic material provided in (i) and the aqueous mixture provided in (ii) obtaining a tin-containing zeolitic material having framework type BEA, wherein the ratio of the volume of the aqueous mixture divided by the mass of the zeolitic material, in cm 3 /g, to the TPV is in the range of from 0.1:1 to 1.7:1, wherein the TPV is the total pore volume of the zeolitic material in cm 3 /g as determined by nitrogen absorption according to DIN 66134; (iv) drying the zeolitic material obtained from (iii).