负载型氧化锌脱硫剂的实验研究  

EXPERIMENTAL STUDY ON THE SUPPORTED ZnO/γ-Al_2O_3 SORBENT FOR GAS DESULFURIZATION

作　　者：王安友[1] 郭曙强[1] 潘晋波[1] 李德颀[1] 丁伟中[1] 

机构地区：[1]上海大学材料学院,上海硕士生200072

出　　处：《煤炭转化》2010年第1期16-21,共6页Coal Conversion

基　　金：国家高技术研究发展计划(863)项目(2006AA11A189);上海市科学技术委员会重点项目(06DZ12212);先进钢铁材料技术国家工程研究中心研究项目(中050209)

摘　　要：采用浸渍法制备了以γ-Al2O3为载体的负载型氧化锌脱硫剂,同时对制得的脱硫剂进行煤气脱硫实验,考察了制备过程中负载量、焙烧温度和硫化温度等对脱硫剂性能的影响,用XRD和BET方法对制得的脱硫剂进行检测.结果表明,制得的脱硫剂存在一个单层分散当量,当负载量低于单层分散当量时,ZnO将以单层或亚单层状态分散在载体γ-Al2O3上(XRD检测不到);当高于负载量时,除了单层或亚单层以外,ZnO晶体也将出现,通过XRD衍射图谱可以观察到ZnO晶体的衍射峰.活性评价实验也表明,在低于单层分散当量时该脱硫剂的穿透硫容随着负载量的增加而增大,且在极高的脱硫精度下(低于0.1×10-6)有较高的活性ZnO穿透硫容,达到了9.7 g S/100 g ZnO;而高于单层分散阈值时稳定性和硫容明显降低.In this study, the supported ZnOγ-Al2O3 sorbents were prepared by the impregnation method. Gas desulfurization tests were made by using these adsorbents. The influence of loading, calcination and sulfur temperature and so on was studied. The prepared adsorbents were characterised by using XRD, BET. The results showed that ZnOγ-Al2O3 may have monolayer dispersed ZnO and ZnO crystallites. There is a threshold monolayer dispersion capacity. If the ZnO loading is lower than the threshold, the ZnO will disperse on the surface of γ-Al2O3 as a monolayer, then the sample will give an XRD pattern with no crystalline ZnO peaks. When the ZnO loading is higher than the threshold, in addition to the monolayer dispersed ZnO , crystalline ZnO will appear, then the sample will give an XRD pattern with crystalline ZnO peaks. And this was also proved by experiment. When the ZnO loading is lower than the threshold ,the breakthrough sulfur capacity is rise with the increase of loading and the high dynamic sulfur capacity 9.7 g S/100 g ZnO was obtained by these adsorbents. By contraries, the stability and capacity decreaced clearly.

关 键 词：负载型脱硫剂 煤气脱硫 负载量 分散阈值 穿透硫容 

分 类 号：TQ546.5[化学工程—煤化学工程]