This repository contains all the measured data that correspond to the results of research into the effect of introducing copper by wet impregnation on the performance of mixed metal oxides Mg-Al in the selective oxidation of ammonia. The work was supported by the OP JAK project "INOVO!!!", No. CZ.02.01.01/00/23_021/0008588 supported by the Ministry of Education, Youth and Sports and co-financed by the European Union. Experimental results were accomplished by using Large Research Infrastructure ENREGAT supported by the Ministry of Education, Youth and Sports of the Czech Republic under project No. LM2023056. The XPS study was carried out using research infrastructure funded by the European Union in the framework of the Smart Growth Operational Programme, Measure 4.2; Grant No. POIR.04.02.00-00-D001/20, “ATOMIN 2.0 – Center for materials research on ATOMic scale for the INnovative economy”. The financial support of the Strategic Programme Excellence Initiative at Jagiellonian University, used for servicing measurement systems, is also appreciated.