Adsorption Desulfurization Of Thiophene On Zeolites

This work mainly involved the investigation of the adsorption of thiophene on NaY molecular sieve and 13X molecular sieve. Different molecular sieve adsorbents were prepared through different modification methods on NaY molecular sieve and 13X molecular sieve. And the adsorption performance of thiophene on the adsorbents were examined by dynamic and static adsorption desulfurization experiments. The results indicated that, for NaY molecular sieves, the adsorbent prepared by modified NaY molecular sieve with sodium hydroxide solution (0.1mol/1), has the best adsoption desulfurization performance when dealing with feed contains thiophene (500-700 mg/1) and hexene (mass fraction 2%). The sulfur adsorption capacity can reach 37.87 mg thiophene for per gram of adsorbent. The addition of hexene (mass fraction of 2%) is favorable for the adsorption desulfurization of sodium hydroxide solution modified NaY molecular sieve adsorbent. It is found that the thiophene rings are adsorbed parallel to the sodium hydroxide modified NaY molecular sieve adsorbent through in-situ FTIR spectra. The binding force formed between the adsorbent and thiophene is weak adsorption. For 13X molecular sieves, the adsorbent prepared by modified 13X molecular sieve with calcium chloride solution (0.1mol/1), has the best adsoption desulfurization performance when dealing with feed contains thiophene (500-700 mg/1) and hexene (mass fraction 2%). The sulfur adsorption capacity can reach 35.64 mg thiophene for per gram of adsorbent. The addition of hexene (mass fraction of 2%) is favorable for the adsorption desulfurization of calcium chloride solution modified 13X molecular sieve adsorbent. It is found that a ring-open reaction would occur for the thiophene ring on the calcium chloride modified 13X molecular sieve adsorbent through in-situ FTIR spectra. The binding force formed between the adsorbent and thiophene is strong adsorption.