The Preparation And Evaluation Of Ni/ZnO Reactive Desulfurization Adsorbent

With the rapid development of China’s economy, car ownership and oil consumption grow rapidly. China has also made strict restrictions on the sulfur content of gasoline. Due to the increasingly stringent environmental regulations on sulfur concentration in transportation fuels, ultra-deep desulfurization has become a more and more important research subject.Represented by S_Zorb process, reactive adsorption of sulfur compounds was the common method for removal of these sulfur compounds because of its high performance and low operational cost. But because of the strength of adsorbent is too low, it will cause the increasing of the reactor’s pressure and shorten the construction period during the adsorption reaction process, that will affect the economic benefits of plant.Ni/ZnO-AI2O3-Si O2 desulfurization adsorbents were prepared by kneading method. The study has selected the best desulfurizer preparation and reaction process conditions by investigating the effects of different preparation methods, reaction conditions, other factors on the performance and strength of desulfurization adsorbent.In this paper, Ni was the main active site for Ni/ZnO-AI2O3-SiO2 desulfurization adsorbents. Choosing Al2O3 and Si O2 as carriers and Nitric acid as Adhesive solvent, desulfurization adsorbents were prepared by kneading method. The single-factor analysis was used to investigate the effects of different preparation methods on the performance and strength of desulfurization adsorbent. Experimental results indicated that the optimal composition for Ni/Zn O-AI2O3-Si O2 desulfurization adsorbents was as follows: Al2O3/SiO2=25%:25%, Ni/Zn molar ratio=0.4, the concentration of nitric acid is 6% as adhesive solvent. Using a lab fixed bed continuous flow reactor to investigate the performance of desulfurization adsorbent, the experimental results indicated that The optimal reaction condition for the best performance of desulfurization adsorbent was T=400℃, P=1MPa. Under these conditions, the sulfur content of FCC gasoline was reduced to 2.1~2.3 mg/L,the desulfurization rate reached 99%, the sulfur breakthrough capacity can reach 5.102%. In a nutshell, the desulfurization adsorbent under the optimal process conditions can achieve the purpose of producing ultra-low sulfur gasoline and has good strength.