Impact analysis of support to Zn-based desulfurizer prepared by high-pressure impregnation method

Abstract：A series of Zn-based sorbents were prepared by the high-pressure impregnation method with four different supports of 4A zeolite（4A）,γ-Al2O3（AL）,activated carbon（AC） and semi-coke（SC）.By XRD,BET and fixed-bed desulfurization performance testing methods,the physical properties and the desulfurization performances of zinc oxide sorbents were studied.The results show that the support type affects the desulfurization behavior（HZ20/ACHZ20/SCHZ20/4AHZ20/AL）,the mechanical strength and thermal stability（HZ20/SCHZ20/ACHZ20/AL HZ20/4A） through the properties of the active component composition on different supports.The high-pressure impregnation method can impregnate active components onto the support and simultaneously change pore structure of the support.The pore structure of HZ20/SC are obviously improved,and its surface area and pore volume are 13.78 and 5.17 times as big as that of raw SC respectively.But the pore structure of the other three sorbents becomes worse.The semi-coke is one of the optimum supports in this preparing method.The ZnO sorbent prepared using semi-coke as support by the high-pressure impregnation method has high precision,big sulfur capacity and good anti-pulverization performance.The HZ20/SC sorbent has the desulfurization efficiency,sulfur capacity and breakthrough time of 99.97%,4.46 g and 23 h.