Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H-2 Rich Environment

Date

2020-07-01

Author

Basu, Dishari
Ailawar, Saurabh
Çelik, Gökhan
Edmiston, Paul
Ozkan, Umit S.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

225
views

0
downloads

Transition metal oxide catalysts tend to deactivate in the presence of moisture during hydrogen purification using preferential oxidation (PROX) of carbon monoxide (CO) . Thus, novel water-tolerant catalysts need to be developed. Herein, the evolution of heat treated swellable organically-modified silica (SOMS), a hydrophobic organic-inorganic hybrid material, has been characterized and applied as a catalyst support for PROX under moisture-rich conditions. While the SOMS-supported cobalt manganese oxide was found to be inactive, drastic improvement in CO conversion was observed for heat treated SOMS (HSOMS) supported catalysts. From thermogravimetric analysis and NMR spectroscopy it was found that SOMS retains its structural properties and hydrophobicity up to 400 degrees C. The performance of these catalysts was improved upon using toluene as the impregnation solvent, which enhanced the support wettability and improved active site deposition. The catalyst supported on HSOMS-400 was found to be more water tolerant than a silica-supported catalyst due to Si-O-Si(CH3)(3) groups retained from hexamethyldisilazane (HMDS) derivatization of SOMS.

Subject Keywords

Physical and Theoretical Chemistry, Inorganic Chemistry, Organic Chemistry, Catalysis

URI

https://hdl.handle.net/11511/70034

Journal

CHEMCATCHEM

DOI

https://doi.org/10.1002/cctc.202000397

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Effect of stabilizer type on the activity and stability of water-dispersible cobalt(0) nanocluster catalysts in hydrogen generation from the hydrolysis of sodium borohydride Metin, Onder; Koçak, Ebru; ÖZKAR, SAİM (Springer Science and Business Media LLC, 2011-08-01) Hydrogen phosphate (HPO4 2−) or poly(acrylic acid) (PAA) stabilized cobalt(0) nanoclusters were in situ generated from the reduction of cobalt(II) chloride during the catalytic hydrolysis of sodium borohydride (NaBH4) in the presence of stabilizers, HPO4 2− or PAA. Cobalt(0) nanoclusters stabilized by HPO4 2− or PAA were characterized by using UV–Visible spectroscopy, TEM, XPS and FT-IR techniques. They were employed as catalysts in the hydrolysis of NaBH4 to examine the effect of stabilizer type on their c...
Synthesis and characterization of ruthenium(0) metal nanoparticles as catalyst in the hydrolysis of sodium borohydride Zahmakıran, Mehmet; Özkar, Saim; Department of Chemistry (2005) Sodium borohydride is stable in alkaline solution, however, it hydrolyses and generates hydrogen gas in the presence of suitable catalyst. By this way hydrogen can be generated safely for the fuel cells. All of the catalyst having been used in the hydrolysis of sodium borohydride, with one exception, are heterogeneous. The limited surface area of the heterogeneous and therefore, have limited activity because of the surface area. Thus, the use of metal nanoclusters as catalyst with large surface area is expe...
Electrochemistry of nickel(II) complexes with N,N'-bis(3,5-di-tert-butylsalicylidene)polymethylenediamines Ozalp-Yaman, S; Kasumov, VT; Önal, Ahmet Muhtar (Elsevier BV, 2005-10-03) The electrochemical oxidation of several N,N'-polymethylenebis(3,5-di-tert- butylsalicylaldiminato)nickel(II) complexes, Ni(L-x), has been studied by cyclic voltammetry and in situ UV-Vis spectroscopy in DMF Cyclic voltammograms of Ni(L-x) (x = 1-4) complexes displayed two-step oxidation processes under nitrogen gas atmosphere. The first oxidation peak potentials of all the Ni(II) complexes corresponds to the reversible one-electron oxidation process of the metal center, yielding Ni(III) species. EPR spectr...
Synthesis of ferrocenyl pyrazoles by the reaction of (2-formyl-1-chlorovinyl)ferrocene with hydrazines Zora, Metin (Elsevier BV, 2007-10-15) Synthesis of ferrocenyl-substituted pyrazoles via the reaction between (2-formyl-1-chlorovinyl)ferrocene and hydrazine derivatives is described. Depending upon the substitution pattern of hydrazine, the reaction affords 1-alkyl/aryl-5-ferrocenylpyrazoles and/or 1-alkyl/ aryl-3-ferrocenylpyrazoles. The reaction appears to be general for a variety of hydrazine derivatives.
Reaction of Metal-Carbene Complexes with Cyclobutenediones: The First General C-C Bond Insertion Reaction for Fischer Carbene Complexes Zora, Metin (American Chemical Society (ACS), 1993-01-01) Alkylcarbene-chromium complexes react with cyclobutenediones to give 2-alkoxy-4-cyclopentene-1,3-diones in moderate yield, accompanied by varying amounts of 4-cyclopentene-1,3-dione derivatives which result from reduction of the initial product by the chromium byproduct. The reaction is general for a variety of cyclobutenedione derivatives with alkoxy, alkyl, or aryl substituents. The major products of the reaction between arylcarbene complexes and cyclobutenediones are 5-alkylidenefuranone derivatives. A m...

Citation Formats

D. Basu, S. Ailawar, G. Çelik, P. Edmiston, and U. S. Ozkan, “Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H-2 Rich Environment,” CHEMCATCHEM, pp. 3753–3768, 2020, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/70034.