摘要
以柠檬酸-硝酸盐作为粘结剂用浆料涂覆法制备出ZnFe_2O_4-α-Fe_2O_3/SiC泡沫结构催化剂,使用X射线衍射(XRD)、扫描电镜(SEM)和N_2气吸附仪等手段表征其物相组成、形貌和结构,研究了柠檬酸-硝酸盐浓度和涂层负载量对结构催化剂涂层形貌、孔结构以及1-丁烯氧化脱氢性能的影响。结果表明,柠檬酸-硝酸盐对活性组分物相组成和比例没有影响;制得的结构催化剂涂层紧凑、平整,且具有较宽的介孔孔径分布;柠檬酸-硝酸盐的浓度和最可几孔径尺寸对结构催化剂性能的影响不大。随着涂层负载量的增加结构催化剂的比表面积逐渐增大,氧化脱氢性能逐渐提高。当涂层的负载量达到0.2 g/mL、丁烯体积空速为300 h^(-1)时丁烯转化率和丁二烯选择性分别达到86%和91%,明显高于颗粒催化剂,表现出优异的氧化脱氢性能。
A foam structured catalyst of ZnFe2O4-α-Fe2O3/SiC was prepared by a slurry-coating method with citric acid-nitrates as binder.Its phase composition,morphology and pore structure were characterized by XRD,SEM and BET.The influence of the concentration of citric acid-nitrates and the deposited amount of slurry on the morphology,pore structure and catalytic performance in the oxidative dehydrogenation of 1-butene of the prepared catalyst were investigated.The result show that the concentration of citric acid-nitrates hardly changed the phase composition;the as-prepared structured catalyst has a compact and neat coating with a wide range distribution of pore size;the concentration of citric acid-nitrates of the slurry or the most probable pore size of the as-prepared catalyst has a little influence on the peformance of the structured catalyst.The BET surface area and the catalytic performance of the structured catalyst gradually increased with the incresing the deposited amount of slurry.In case of gas firing hourly space velocity of bntene of 300 h^-1,the conversion rate of 1-butene and selectivity of butadiene reache ca.86% and 91%,respectively for the prepared structured catalyst with a deposited amount of 0.2 g/m L slurry,which are much higher than that for particulate catalysts,indicating superior oxidative dehydrogenation performance.
作者
姜仁政
矫义来
孙博
杨晓丹
杨振明
张劲松
JIANG Renzheng;JIAO Yilai;SUN Bo;YANG Xiaodan;YANG Zhenming;ZHANG Jinsong(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2018年第3期225-232,共8页
Chinese Journal of Materials Research
