共搜索到62条信息,每页显示10条信息,共7页。用时:0小时0分4秒950毫秒
纯镍表面结焦形貌及其影响因素研究 柯伟1,郑玉贵1,胡壮麒1,杨院生1,吴欣强1 (1.中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016) 摘要:系统研究了丙烷裂解过程中纯镍表面的结焦形貌及其影响因素.结果表明,纯镍表面的沉积焦炭有三种形貌,分别为纤维状,颗粒状和膜状.纤维状焦炭在800℃左右形成,需要基底金属镍的参与,预氧化后的镍表面显著加剧这种焦炭的沉积.提高结焦温度或延长结焦时间,结焦机制发生转变,焦炭形貌也逐渐转变为颗粒状.颗粒状焦炭形成于气相反应,与基底金属镍无关.膜状焦炭形成于结焦初期,溶解/析出机制及表面直接形核,生长机制均对其形成有贡献.抑制纤维状焦炭的形成有益于减轻镍表面总的结焦程度 关键词:纯镍丙烷裂解反应表面结焦预氧化; pure nickel; propane; cracking reaction; surface coking; pre......
deposition (FBCVD) at deposition temperature of 1250-1450 ℃ with propane at different concentrations. The effects of deposition temperature and propane concentration on the microstructure of the LTIC were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the deposition temperature and propane concentration have great influence......
University, Hangzhou 310018, China; 2. Lanzhou Lanfei Medical Instrument Limited Company, Lanzhou 730070, China) Abstract: The effects of deposition temperature and propane volume fraction... fluidized bed chemical vapor deposition (FBCVD) with the deposition temperature from 1 250 ℃ to 1 450 ℃ and different propane volume fractions. The results show that the structure dominated......
氧化锰/高炉渣催化剂的丙烷氧化脱氢性能徐爱菊1,照日格图1,林勤2(1.内蒙古自治区呼和浩特市内蒙古师范大学 化学与环境科学学院2.北京科技大学 冶金与生态工程学院,北京 100083)摘 要:以攀钢高炉渣为载体,采用固体研磨法负载MnO,制备了MnO/高炉渣负载型催化剂,并以XRD,H2-TPR技术对催化剂进行表征,研究了其对丙烷氧化脱氢制丙烯反应的催化性能.试验结果表明MnO的负载量为20%时催化剂表现最好的催化性能,在500℃时丙烷转化率为17.84%,丙烯选择性为63.75%.试验为资源综合利用及减少环......
in the paper.The sedimentation velocities of Si and SiC particles in some organic solvents were investigated.Considering the polarity,viscosity,and density of solvents,the chloroepoxy propane and carbon......
South University, Changsha 410083, China) Abstract: Using P-toluene acid as a catalyst, 2-methyl-1,3-Propanediol di(3-mercaptopropionic) ester (PD3ME), 1,1,1- Tris(hydroxymethyl) propane tri(3-mercaptopropionic) ester (HPT3ME) and Pentaerythritol tetra(3-mercaptopropionic) ester (PT3ME) were obtained through esterification reaction by 2-methyl-1,3-Propanediol, 1,1,1-Tris(hydroxymethyl) propane......
chemical vapor infiltration(CVI) technology with propane (C3H6) as the carbon precursor gas and nitrogen (N2) as the carrier gas. The chemical process of deposition of pyrolytic carbon was deduced... composites. Namely, at high temperature, fill gas phase carbon precursor, for example, methane, propane, propylene, and benzene into the carbon fiber preforms. While the gas containing the carbon precursor......
......
......
(TDE-85/MeTHPA) epoxy resin modified by polyurethane (PU) was prepared with 1,4-butanediol (1,4-BDO), trimethylol propane (TMP) and polyurethane prepolymer synthesized by polypropylene glycol and toluene..., trimethylol propane (TMP), and 1,4-butanediol (1,4-BDO) with chemical pure grade were provided by Shanghai Reagent Plant. The industrical product of methyl tetrahydrophthalic anhydride (MeTHPA) was supplied......