(721f) Insight into the Effects of Ni-Support Interactions on Enhanced Selectivity of Base-Growth CNTs and COx-Free H2 Production from Thermocatalytic Decomposition of Methane
We have investigated the development of catalyst(s) that promote âbase grownâ versus âtip grownâ CNT formation. Base grown CNTs offer the potential for easier catalyst regenerability while also generating a highly pure and crystalline carbon product. In this presentation we report on a series of Ni-based catalysts prepared using different supports. Supports investigated include gamma-Al2O3, Al2O3 aerogel, and alumina spinel formulations. Catalysts were characterized using XRD, BET, TPR, HRTEM, and H2-Chemisoprtion techniques. Catalytic activities were evaluated using different pretreatment methods and operating temperatures; both variables critically affecting catalytic performance. Metal-support interaction was found to influence the resulting nickel metal particle size and distribution, as well as the morphology of produced CNTs (e.g., tip versus base growth). Spent samples were characterized using HRTEM, Raman spectroscopy, and TPO analysis.