改性分子筛催化褐煤微波热解挥发分提质研究  

Upgrading of volatile matter of lignite using modified molecular sieve catalyst by microwave pyrolysis

作　　者：张彤 王晴东[1] 王光华[1] 曾维鹏 Zhang Tong;Wang Qingdong;Wang Guanghua;Zeng Weipeng(Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学,湖北武汉430081

出　　处：《煤化工》2022年第3期98-103,共6页Coal Chemical Industry

基　　金：国家重点研发计划项目(2017YFB0304303);国家重点实验室开放基金项目(2018-K19)。

摘　　要：为了实现褐煤的清洁高效利用,采用微波热解技术,探究微波反应器中ZSM-5分子筛催化剂对先锋褐煤热解挥发分的催化提质作用。通过浸渍法制备了Fe、Co、Ni改性的ZSM-5分子筛催化剂,采用SEM、XRD、BET和NH3-TPD对催化剂进行了表征,研究了微波功率和不同催化剂对产物产率和焦油中芳烃生成特性的影响。结果表明:微波热解的最佳功率为700 W,在此功率下,通过微波催化热解,有效提升了气体产物中有效组分H_(2)+CO的含量;金属的引入显著提高了焦油中芳香烃的产率以及对轻质芳烃的选择性;其中,Ni@ZSM-5获得了最高气体有效组分体积分数(93.20%)、最高芳香烃产率(质量分数72.92%),轻质芳烃产率较未催化提升了34.08个百分点。In order to realize the clean and eff icient utilization of lignite, microwave pyrolysis technology was used to explore the catalytic upgrading effect of ZSM-5 molecular sieve catalyst in the microwave reactor on the pyrolysis volatiles of Xianfeng lignite. The Fe, Co and Ni modified ZSM-5 molecular sieve catalysts were prepared by the impregnation method, and the catalysts were characterized by SEM, XRD, BET and NH3-TPD. The effects of microwave power and different catalysts on product yield and aromatics formation characteristics in tar were studied. The results showed that the optimal power of microwave pyrolysis was 700 W. Under this power, microwave catalytic pyrolysis could effectively increase the content of effective components H_(2)and CO in the gas product. The introduction of metals significantly improved the yield of aromatics in tar and the selectivity to light aromatics. Among these catalysts, Ni@ZSM-5 achieved the highest gas effective component content(volume fraction of 93.20%), the highest aromatic yield(mass fraction of 72.92%), and the light aromatic yield increased by 34.08 percentage points compared with that uncatalyzed.

关 键 词：褐煤 微波热解 改性分子筛 催化提质 轻质芳烃 

分 类 号：TF526[冶金工程—钢铁冶金]