论文部分内容阅读
采用共沉淀法制备了ZnO、Al-ZnO和一系列xMn-Al-ZnO(x为Mn的物质的量)吸附剂,在常温条件下测试了样品的脱除H_2S性能。通过N_2物理吸附、XRD、SEM、XPS对吸附剂进行了表征,考察了其形貌结构及表面物理化学性质。脱硫性能测试结果显示,随着Mn含量的增加,吸附剂脱硫性能呈现先增大后减小再增大再减小的趋势,两个极值点分别出现在0.02Mn-Al-ZnO和0.08Mn-Al-ZnO。结合表征结果发现,不同Mn掺杂量对AlZnO吸附剂的脱硫性能表现出不同的促进作用。0.02 mol Mn掺杂能提高Al-ZnO吸附剂的比表面积至171.4m~2/g,进而促进其H_2S脱除性能;随着Mn掺杂量增加,吸附剂比表面积下降,但更多Mn进入ZnO晶格导致Mn和Zn之间相互作用增强,进而促进脱硫性能;然而,随着Mn掺杂量进一步增加,吸附剂比表面积继续下降,并且生成ZnMn_2O_4晶相,导致脱硫性能下降。0.08Mn-Al-ZnO的脱硫性能最佳,在25℃,体积空速3 000 h~(-1),H_2S质量浓度1.39×10~(-3)g/L条件下,穿透硫容为7.21%。结果表明,不同Mn掺杂量会导致吸附剂的形貌结构、晶相和表面物化性质发生不同程度的变化,由不同影响因素主导的x Mn-Al-ZnO吸附剂表现出脱硫性能的差异。
ZnO, Al-ZnO and a series of xMn-Al-ZnO (x amount of Mn) adsorbents were prepared by co-precipitation method. The removal of H 2 S from samples was tested at room temperature. The adsorbents were characterized by N 2 physisorption, XRD, SEM and XPS. The morphology and surface physico-chemical properties of the adsorbents were investigated. Desulfurization performance test results show that with the increase of Mn content, the desulfurization performance of adsorbent first increases, then decreases then increases and then decreases. The two extreme points appear at 0.02Mn-Al-ZnO and 0.08Mn -Al-ZnO. According to the characterization results, it was found that the different amounts of Mn doping promoted the desulfurization performance of AlZnO adsorbents. 0.02 mol Mn doping can increase the specific surface area of Al-ZnO adsorbent to 171.4m 2 / g, and further promote its H 2 S removal performance. With the increase of Mn doping, the specific surface area of adsorbent decreases, but more Mn enters However, with the further increase of Mn doping amount, the specific surface area of adsorbent continues to decrease, and the crystalline phase of ZnMn 2 O 4 is formed, resulting in a decrease of desulfurization performance. The desulfurization performance of 0.08Mn-Al-ZnO was the best. Under the conditions of 25 ℃, space velocity 3 000 h -1, H 2 S mass concentration 1.39 × 10 -3 g / L, 7.21%. The results show that different Mn doping levels lead to different morphologies, crystalline phases and physico-chemical properties of the adsorbent. The x Mn-Al-ZnO adsorbents dominated by different influencing factors show the difference of desulfurization performance.