Study On Preparation Of Activated Carbon By Double Metal And Its Desulfurization Performance

Natural gas has been paid more and more attention as a high quality, efficient an d clean energy. Natural gas contains acid gas, such as H2 S, and it can lead to physic al safety threats and environmental pollution, the country makes stringent standards on the acid gas components in the natural gas, so desulfurization processing must be car ried out before using to achieve the national standard.In this paper, using low concentration H2 S and nitrogen gas mixture for simulate raw fuel gas, four modified activated carbon by double metal were prepared. the adsorbents were characterized by X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FI-IR)、 specific surface area(BET) and scanning electron microscopy(SEM). Effects of condition on the performance of hydrogen sulphide removal were studied using a fixed-bed adsorption column.(1) ZnO-MnO2 supported activated carbon adsorbent. The absorbent loading MnO2 after ZnO, with MnO2, AC to ZnO mass ratio of 0.8:1:0.5 and 5 wt% Zinc nitrate solution and calcination temperature of 350 ℃ was found to give the best preparation conditions of adsorbent. The adsorption temperature of 50 ℃ and 20 m L/min gas velocity was found to give the best process conditions of adsorbent. Breakthrough time can reach 23 minutes, the saturated sulfur capacity and desulfurization rate can reach 75.3mg/g and 53.2%.(2)Fe2O3-Co3O4 supported activated carbon adsorbent. The absorbent loading Co3O4 after Fe2O3, with Fe2O3, AC to Co3O4 mass ratio of 1.2:1:0.8 and 8 wt% Cobalt nitrate solution and calcination temperature of 350 ℃ was found to give the best preparation conditions of adsorbent. The adsorption temperature of 40 ℃ and 20 m L/min gas velocity was found to give the best process conditions of adsorbent. Breakthrough time can reach 27 minutes, the saturated sulfur capacity and desulfurization rate can reach 75.3mg/g and 53.2%.(3)Fe2O3-ZnO supported activated carbon adsorbent. The absorbent loading Zn O after Fe2O3, with Fe2O3, AC to Zn O mass ratio of 0.8:1:0.5 and 5 wt% Zinc nitrate solution and calcination temperature of 350 ℃ was found to give the best preparation conditions of adsorbent. The adsorption temperature of 50 ℃ and 20 m L/min gas velocity was found to give the best process conditions of adsorbent. Breakthrough time can reach 39 minutes, the saturated sulfur capacity and desulfurization rate can reach 168.1 mg/g and 66.1%.(4)MnO2-Co3O4 supported activated carbon adsorbent. The absorbent loading Co3O4 after MnO2, with MnO2, AC to Co3O4 mass ratio of 1:1:0.8 and 8 wt% Cobalt nitrate solution and calcination temperature of 350 ℃ was found to give the best preparation conditions of adsorbent. The adsorption temperature of 40 ℃ and 20 m L/min gas velocity was found to give the best process conditions of adsorbent. Breakthrough time can reach 108 minutes, the saturated sulfur capacity and desulfurization rate can reach 489.7 mg/g and 96.8%.