Layered perovskite-like oxides NaLaTiO(4)and K2La2Ti3O10, which correspond to the Ruddlesden-Popper phases, are synthesized using various amounts (30, 100, and 1000%) of excess alkali metal carbonate in the batch and transformed into the corresponding protonated forms HLaTiO(4)and H(2)La(2)Ti(3)O(10)through the ion exchange in an aqueous solution of 0.1 M nitric acid. It is determined that an increase in the carbonate content in the reaction mixture does not affect the crystal structures of final compounds; however, it affects the morphology of HLaTiO(4)polycrystals in the case of NaLaTiO(4)protonation, that can be used for the targeted synthesis of particles with the pore size of 25 to 500 nm.