| Synthesis and Characterization of Highly Ordered Ni-MCM-41 Mesoporous Molecular Sieves | ||
| Yanhui Yang1, Sangyun Lim2, Guoan Du3, Chuan Wang4, Yuan Chen4, Dragos Ciuparu4 and Gary L. Haller2, (1)Chemical Engineering, Yale University, 9 Hillhouse Ave, New haven, CT 06520-8286, (2)Yale University, 9 Hillhouse Ave, New Haven, CT 06520-8286, (3)Yale University, 9 Hillhouse Ave. Room 220, New haven, CT 06520, (4)Chemical Engineering, Yale University, 9 Hillhouse Ave. Rm 220, New haven, CT 06520 Highly ordered Ni-MCM-41 samples with nearly atomically dispersed nickel ions were prepared reproducibly and characterized extensively by nitrogen physisorption, XRD, TEM, hydrogen TPR, UV-vis spectroscopy, FTIR, and X-ray absorption spectroscopy. Results have shown that physicochemical properties of Ni-MCM-41(e.g., structural order, reducibility, density of surface silanol group, and the distribution of nickel ions in the silica framework etc.) can be controlled precisely; and they are greatly dependent on the MCM-41 synthesis parameters, for example, pH and the tetramethylammonium group concentration in the initial synthesis solution. In this research, we also demonstrated a method for designing Ni-MCM-41 catalysts for application SWNT synthesis, CO and CO2 methanation reaction, all systems which require catalyst exposure to reducing environments which normally lead to formation of large metallic Ni clusters. Extended Abstract Status: Not Uploaded | ||