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Abstract  

This paper presents the synergetic effect of Te2MoO7 and MoO3 (WO3) in the partial oxidation of propylene to acrolein. The study found that the addition of MoO3 (or WO3) to Te2MoO7 greatly promoted the propylene conversion and acrolein yield. As the results of the investigation revealed, the higher catalytic performance could be attributed to the increased acidity, which is beneficial for the adsorption of propylene.

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Abstract  

Nano Ni–W catalysts with different tungsten contents prepared by mixing alkaline nickel carbonate with ammonium tungstate show high activity and good sulfur tolerance for hydrogenation of thiophene-containing ethylbenzene. The catalysts were characterized by XRD, TPR, SEM, Raman and BET. The results show that the activity of the catalysts for ethylbenzene hydrogenation is affected profoundly by W loading and the best result was obtained on catalyst with W/Ni ratio equal to 0.16. The increase of activity of the catalyst can be attributed to the interaction between Ni and W doped and the increase of the surface area of the catalyst.

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Abstract

Hydrogen spillover on Ni–CsxH3−xPW12O40 (x = 0, 1, 2) double-function hydrocracking catalyst was studied by temperature-programmed desorption (H2-TPD and NH3/H2-TPD) and thermodynamic calculations. The results of H2-TPD show that the hydrogen adsorption amount on the two-component Ni–CsxH3−xPW12O40 (x = 0, 1, 2) catalysts is much greater than that on single-component catalysts, such as nickel, tungstophosphoric acid and its cesium salts. Moreover, the H+ content is related to the content of Ni–CsxH3−xPW12O40. The above phenomena can be explained by the spillover hydrogen H combining with H+ to form Hn + (n = 2, 3). The results of NH3/H2-TPD can also indirectly prove the existence of Hn +. It is demonstrated by the theoretical calculation that the formation of Hn + (n = 2, 3) from H and H+ is favorable in energy, and NH3 may combine with H3 + to form NH6 +.

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