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The structural change of Pd induced by acid sites of zeolite was studied by using EXAFS. The anchoring of dispersed PdO on the acid sites of ZSM-5 was evidenced from the reversible structural change of Pd upon the reduction and oxidation treatments. The novel method to regulate the dispersion of metal Pd and PdO through changing the acid concentration of zeolite was proposed.
Source of selectivity of p-xylene formation in the disproportionation of toluene was studied on more than 20 kinds of the synthesized ZSM-5 using multiple characterization techniques. Based upon the total characterization and its comparison with the selectivity, we found that the selectivity in disproportionation could be correlated with not only the diffusion rate but also the external solid acidity,...
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