首页|Synthesis of quantitative sulfur-poisoned Pd/?-Al2O3 and its deactivation mechanism for catalytic combustion of toluene
Synthesis of quantitative sulfur-poisoned Pd/?-Al2O3 and its deactivation mechanism for catalytic combustion of toluene
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NSTL
Elsevier
A series of Pd/gamma-Al(2)O(3 & nbsp;)with different degrees of sulfur poisoning have been successfully prepared by in-situ thermal decomposition of (NH4)(2)SO4. The influence of sulfur poisoning on toluene combustion was evaluated. The samples were characterized by XRD, N-2 adsorption/desorption, HRTEM, FT-IR, TG, XPS, NH3-TPD and H-2- TPR. The results indicated that the no-poisoned Pd/gamma-Al2O3 showed the highest activity, which was attributed to the cooperation of Pd0 and Pd2+ species. However, all sulfur-poisoned catalysts showed a decline in activity, which was quantitatively related to the amount of (NH4)(2)SO4. It was found that the Pd0 active sites were more easily contaminated by sulfur species than the Pd2+ active sites, resulting in the deactivation of the catalysts. In addition, gamma-Al2O3 also reacted with sulfur to produce aluminum sulfur, which led to a significant increase in the strong acid site of the catalyst, while no beneficial effect was observed during our study.
NSTL
Elsevier
