
Zeolite-assisted core-shell redox catalysts for efficient light olefin ...
2021年4月1日 · The cyclohexane temperature-programmed reaction (CH-TPR) was designed to investigate the performances of the SHC and zeolites materials and carried out in a 1/8 in. ID fixed-bed quartz U-tube reactor. And a tube furnace with a K-type thermocouple was applied to provide the heat.
Sodium tungstate-promoted CaMnO3 as an effective, phase …
2020年5月1日 · In order to investigate the role of the sodium tungstate promoter and the oxygen released by the redox catalyst in the cyclohexane ROC process, cyclohexane temperature-programmed reaction (CH-TPR) experiments of the as-prepared samples were carried out using a 1/8 in. ID fixed-bed quartz U-tube reactor.
Temperature-Programmed (TP) Techniques | SpringerLink
2023年3月25日 · Temperature-programmed techniques are a group of methods that employ the stimulus of rapidly increasing temperature that yields responses (detected as changes in heat (uptake/loss), weight (uptake/loss), or evolution of gases) providing information about a material’s physical/chemical properties and/or its catalytic reaction products [1, 2].
一文读懂程序升温还原(TPR) - 材料牛
2019年8月16日 · 程序升温技术 (TPAT)是在程序控制温度T下,测量气体的脱附,物质的还原、氧化、硫化和表面反应的技术,可以获得的信息有:表面吸附中心的类型、密度和能量分布;反应分子的动力学行为和反应机理;活性组分和载体、活性组分之间、活性组分和助催化剂、助催化剂和载体之间相互作用;各种催化效应,如溢流效应、协同效应、助催化效应等;催化剂失活和再生等。 具体分类如下: 图1 程序升温技术分类. (1)研究背景:金属氧化物的重要性能与与磁、 …
用于CH4脱氢芳构化的Mo/HZSM-5催化剂的H2-TPR研究 ... - X-MOL
2006年4月1日 · 摘要 利用氢气的程序升温还原 (TPR) 研究了不同方法制备的 Mo/HZSM-5 催化剂上 Mo 物种的还原性,并借助 1H MAS NMR 精确指定了六个可能的 H2 消耗峰。 首先确定了与布朗斯台德酸位点相关的 Mo 物种减少对应的 TPR 峰。 此外,研究了各种钼基催化剂对甲烷脱氢芳构化的催化性能。 位于 HZSM-5 沸石通道中并与布朗斯台德酸位点相关的 Mo 物种对甲烷脱氢芳构化中单环芳烃的形成更加活跃和稳定。 摘要 利用氢气的程序升温还原 (TPR) 研究了不同方 …
Interpretation of H2-TPR from Cu-CHA Using First-Principles ...
2024年3月8日 · Here, we analyze H 2-TPR over Cu-CHA by density functional theory calculations, microkinetic modeling, and TPR measurements of samples pretreated to have a dominant Cu species. We find that H 2 can react with Cu ions in oxidation state +2, whereas adsorption on Cu ions in +1 is endothermic.
China Thermoplastic Elastomer, Plastic, TPE TPR Manufacturers ...
As the world's largest consumer market for TPES (styrene-based thermoplastic elastomer) products, China has long relied on imports for high-end TPES products, especially hydrogenated TPES products.
Temperature-programmed surface reaction (TPSR) of CH4 …
2009年3月15日 · TPSR experiments are basically a temperature-programmed adsorption/desorption reaction performed by detecting the outlet gas product as a function of temperature.
晶格氧用于甲烷氧化制合成气的研究—氧化铁的氧化还原性能
制备了氧化铁催化剂,对其进行了程序升温实验(O2-TPD、空气-TPO和CH4-TPR)和不同温度下的多次CH4-空气脉冲循环反应,并对催化剂进行了XRD表征.研究结果表明,Fe2O3不仅具有较高的稳定性,还具有良好的氧化还原性能,可使CH4氧化为CO2和H2O.在750~850 ℃的范围内,Fe2O3具有良好的提供晶格氧的能力;在900 ℃以上,供氧速度减慢,供氧和补氧能力明显降低.XRD测试结果表明,高于900 ℃时,脉冲空气不能将与脉冲CH4反应后的氧化铁氧化为Fe2O3晶相,导致了氧化铁 …
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