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In this study, hydrogen sulfide absorption of aluminum doped zinc oxide nanoparticles with different aluminum concentrations (Zn_xAl_1−xO) has been investigated. The gas absorption rate and the samples' structural evolutions have been also investigated by X-ray fluorescence and X-ray diffraction measurements. The morphologies and particles size distribution of samples have been determined by scanning electron microscope. The results showed that the Al doped samples have higher absorption rate in respect to the pure zinc oxide. The maximum absorption rate was obtained for the sample with x=0.01. The average size of nanoparticles in this sample was 44nm, which was also the lowest value among the other samples.