Synthesis, Characterization and the gas phase catalytic activity of metal doped nanoporous carbon
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Synthesis, Characterization and the gas phase catalytic activity of metal doped nanoporous carbon Ponnaiyan Ayyappan and Henry C. Foley Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA. ABSTRACT Metal doped nanoporous carbon(NPC) materials, based on polyfurfuryl alcohol and polyethylene glycol were synthesized using new method. The characterization were carried out using acid-base titration, PXRD, TEM, diffused reflectance FTIR, SEM and mass spectrometer. Their gas phase catalytic activities were checked by passing CO and H2 through the catalysts. Carbondioxide and methane were the evolved gases when CO was passed through the catalyst, whereas carbonmonoxide and methane are the resultant gases when H2 was taken up by the catalyst.
INTRODUCTION Nanoscale engineering in nanoporous carbon (NPC) materials, based on polyfurfuryl alcohol(PFA) and polyethyleneglycol(PEG) have been given much attention in recent years due to the discovery of its potential candidate for natural gas storage devices, electrodes, and catalytic materials and for gas separation.[1-4] The nanopores centered around 0.5nm, the transport pores around 10nm, higher thermal stability and surface area(600 m2/g) are the special futures of NPC catalysts. Adding alkali metals into these nanopores have been interest to researchers for many years because of its uptake of alkali metals into the nanopores and act as the wonderful base catalysts for the doublebond migration.[5] But, synthesis and characterization of these nanoporous materials, especially controlling the structure and restructure and the poresize, are difficult problems. Though there are a few reports dealing with controlling the nanopore size,[6] the fundamental aspects of the formation of highly ordered and rigid arrays of nanoporous carbon are poorly understood. In this context, we report here a systematic synthetic technique for the preparation of locally ordered and rigid arrays of metal-doped carbon materials, their structural characterization, features and catalytic activities in gas phase reactions.
EXPERIMENTAL DETAILS Synthesis of NPC: The nanoporous carbon used was prepared from a mixture of polyfurfuryl alcohol (PFA) Monomer-Polymer Dijac Laboratories - Feasterville, PA) and polyethylene glycol (PEG) (Sigma-Aldrich – Milwaukee, WI) following previously published methods.[7] The average molecular number of PEG was 8000 g/mol. This was added to PFA at 75 oC to create a 25 mass% PEG 75mass% PFA solution. The resulting liquid was heated from 25 oC to 200 oC at 5 oC/min. The liquid was allowed to soak at
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200 oC for 2 hours before heating to 800 oC at 10 oC/min. The solid then remained at this temperature for 8 hours. The entire pyrolysis was completed within a quartz tube in an atmosphere of flowing argon (100ml/min) (100ml/min) (99.95% MG Industries - State College PA). The solid was then transferred to an inert atmosphere glovebox (MBraun – Stratham, NH) and heated at 350 oC in vacuum for 18 hours to remove
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