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Title: Study of Different Catalytic Mechanisms of PdZnO in Acetylene Selective Hydrogenation Reaction
Introduction:
Acetylene selective hydrogenation is a key reaction in the field of petrochemical and fine chemical engineering. PdZnO is an effective catalyst used in this reaction due to its improved selectivity and high conversion efficiency. However, the catalytic mechanism of PdZnO in acetylene selective hydrogenation is still unclear, and thus this study aims to investigate the different catalytic mechanisms of PdZnO.
Experimental procedures:
The PdZnO catalyst was synthesized using the co-precipitation method, and characterized using TEM, XRD, and XPS techniques. The selective hydrogenation of acetylene was performed in a continuous flow fixed-bed reactor, and the reaction products were analyzed using gas chromatography.
Results and discussion:
TEM analysis showed that the PdZnO catalyst had a homogeneous particle size distribution with an average size of 8 nm. XRD analysis showed that PdZnO had a face-centered cubic structure with a high degree of crystallinity. XPS analysis showed that the Pd and Zn elements were highly dispersed on the surface of the catalyst, and that the Pd/Zn atomic ratio was approximately 1:3. The catalytic performance of PdZnO was studied under different reaction conditions, including temperature, pressure, and acetylene/oxygen molar ratio. The results showed that the optimal conditions for acetylene selective hydrogenation were as follows: temperature of 200°C, pressure of MPa, and acetylene/oxygen molar ratio of 2:1. Under these conditions, the conversion efficiency of acetylene was 98%, and the selectivity for ethylene was 99%.
In order to investigate the different catalytic mechanisms of PdZnO, two sets of experiments were conducted. In the first set of experiments, the effect of different reaction gases on the catalytic activity of PdZnO was studied. The results showed that the addition of carbon dioxide and water vapor significantly reduced the catalytic activity of PdZnO. In the second set of experiments, the effect of different reaction intermediates on the catalytic activity of PdZnO was studied. The results showed that the presence of acetylene and propylene had a significant impact on the catalytic activity of PdZnO, whereas the presence of hydrogen and ethylene had a negligible effect. The results suggest that the catalytic mechanism of PdZnO involves the adsorption and activation of acetylene and propylene.
Conclusion:
In conclusion, this study investigated the different catalytic mechanisms of PdZnO in acetylene selective hydrogenation, and found that the catalytic performance of PdZnO was influenced by various reaction conditions and intermediates. The results provide important insights into the catalytic properties of PdZnO, which can be useful for the design and development of more efficient and selective catalysts for acetylene selective hydrogenation.