کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
69106 48530 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Facile synthesis and characterization of ordered mesostructured nickel catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Facile synthesis and characterization of ordered mesostructured nickel catalysts
چکیده انگلیسی

Nickel precursors were added midway during the self-assembly of a block copolymer and a silica precursor, leading to the rapid and facile production (one-step) of highly ordered mesoporous nickel catalysts. Ni-MH and Ni-MS were prepared using HCl or H2SO4 as the acid source. Both Ni-MH and Ni-MS contain uniform mesopore channels with a periodic mesochannel alignment (space group, p6mm). Ni-MS contained smaller nickel particles than Ni-MH, as evidenced by XRD and TEM analyses. TEM images clearly show that NiO in Ni-MH is deposited along the mesopore channel. Both the critical dependence of the temperature used in the synthesis of Ni-MH on nickel loading and the increase in nickel loading resulting from the use of SO42− (Ni-MS) as a counteranion indirectly suggest that the self-assembly of mesostructured nickel catalysts mainly involves an electrostatic pathway and complexation between the polyethylene oxide (PEO) branch in P123 and Ni2+. The routes for the self-assembly appear to largely involve electrostatic interactions in the case of Ni-MS and coordination by PEO in the case of Ni-MH. The morphologies of the Ni-MH and Ni-MS catalysts can be manipulated by varying the reaction temperature used, thus permitting the production of uniform rod-like forms or uniform spherical particles. As the reaction temperature is increased, both Ni-MH and Ni-MS appear to have a more curved shape in both meso and macroscopic views.

A facile and rapid synthesis using different acid sources including nickel salts and initial stage reaction temperatures for the preparation of mesostructured catalysts is described. Nickel precursors were added midway during the self-assembly of a block copolymer and a silica precursor, leading to one-step production of highly ordered mesoporous nickel catalysts. These mesostructured nickel catalysts were characterized and applied to the hydrodechlorination (HDC) of 1,1,2-trichloroethane. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 244, Issues 1–2, 1 February 2006, Pages 151–159
نویسندگان
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