摘要
采用挤出成型法制备蜂窝状氮化硼催化剂,考察了水粉比、溶胶种类、溶胶含量及羟丙基甲基纤维素含量等因素对成型效果的影响。筛选出合适的水粉比为0.85∶1,粘结剂为硅溶胶(所含SiO_(2)质量占氮化硼粉体的10%)和5%羟丙基甲基纤维素。对制备的蜂窝状氮化硼进行表征表明,片状氮化硼在剪切应力的作用下沿挤出方向定向排列,片体表面分布有球形的SiO_(2)颗粒,二者之间形成B—O—Si键。分析了蜂窝状氮化硼成型过程中发生变形和开裂的原因并提出优化方向。初步应用于丙烷氧化脱氢反应结果表明,蜂窝状氮化硼催化剂在高空速条件下表现出比粉末氮化硼更优异的性能。
A honeycomb boron nitride catalyst is prepared via extrusion molding method.The impacts of water-powder ratio,sol type,sol content and hydroxypropyl methylcellulose content on molding effect are investigated.It is found that the suitable ratio of water to powder is 0.85∶1,and silica sol(mass ratio of SiO_(2)to boron nitride powder is 10%)and 5%hydroxypropyl methylcellulose are used as the binder.The characterization shows that boron nitride plates are directionally arranged along the extrusion direction under the action of shear stress,and spherical SiO_(2)particles are distributed on the surface of the plates with B-O-Si bonds formed between them.The causes of deformation and cracking in the molding process of honeycomb boron nitride are analyzed,and the feasible optimization direction is put forward.It is shown through application in the oxidative dehydrogenation of propane that honeycomb boron nitride catalyst presents better performance than powder boron nitride at a high space velocity.
作者
岳雨蒙
盛健
王思佳
王东琪
陆安慧
YUE Yu-meng;SHENG Jian;WANG Si-jia;WANG Dong-qi;LU An-hui(Liaoning Provincial Key Laboratory for Catalytic Conversion of Carbon Resources,State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第S02期76-82,共7页
Modern Chemical Industry
基金
国家自然科学基金重点项目(21733002)
国家重点研发计划项目(2018YFA0209404)
关键词
氮化硼
蜂窝状
催化剂成型
丙烷氧化脱氢
boron nitride
honeycomb
catalyst molding
oxidative dehydrogenation of propane
