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Catalyst deactivation is an unavoidable process that occurs in catalytic chemical reactions. Laser Induced Breakdown Spectroscopy (LIBS) is used here as a novel approach to investigate the activity of palladium supported with carbon catalyst (Pd/C) over the hydrogenation of cinnamic acid with tetralin. Their outputs for four catalyst samples are reported for different time intervals of 0, 5, 10, 15 min during the reaction. The results of LIBS analysis are compared to Inductively Coupled Plasma Mass Spectrometry (ICP-MS), which

Laser Induced Breakdown Spectroscopy (LIBS) method is introduced as a novel approach in this work to study catalyst deactivation of V 2 O 5 /γ--Al 2 O 3 for gas-phase dehydration of glycerol and producing acrolein. The LIBS results of V 2 O 5 /γ-Al 2 O 3 samples are compared with those data that are obtained by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). Experimental data of LIBS 1057 data specify that line intensities of vanadium are decreased by deactivation of V 2 O 5 /γ-Al 2 O 3 catalyst. A comparison between the results of LIBS test as well as ICP-OES analysis shows that the amount of vanadium is decreased in the catalyst. Moreover, coke formation changes the surface of the catalyst. The results of deactivation of V 2 O 5 /γ-Al 2 O 3 are also compared with Pd/C catalyst deactivation.