A perovskite oxide, YBa2Cu3O7-x (YBCO), has been prepared by the method of carbonate precipitation from a mixed nitrate solution and oxidised at 950 degrees C in an air atmosphere to obtain a perovskite oxide to be used as a catalyst for H-2/CO reactions. The characterisation of the perovskite oxide was performed by using X-ray diffraction before and after the treatment with different gases, A.C. susceptibility measurements, particle size measurements and temperature programmed reduction (TPR) in which hydrogen was used in order to monitor the changes of the perovskite with temperature in a hydrogen atmosphere. A.C. susceptibility measurements showed that the YBCO perovskite exhibited the typical good superconducting sharp transition temperature at 93 K, indicating that the wet chemical preparation route is suited to the production of this material.