1 Ocak 2018 Dergi makalesi Açık Erişim

Bozbag, Selmi E.; Sot, Petr; Nachtegaal, Maarten; Ranocchiari, Marco; van Bolchoven, Jeroen A.; Mesters, Carl

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{
  "@context": "https://schema.org/", 
  "@id": 35659, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "name": "Bozbag, Selmi E."
    }, 
    {
      "@type": "Person", 
      "name": "Sot, Petr"
    }, 
    {
      "@type": "Person", 
      "affiliation": "Paul Scherrer Inst, CH-5232 Villigen, Switzerland", 
      "name": "Nachtegaal, Maarten"
    }, 
    {
      "@type": "Person", 
      "affiliation": "Paul Scherrer Inst, CH-5232 Villigen, Switzerland", 
      "name": "Ranocchiari, Marco"
    }, 
    {
      "@type": "Person", 
      "name": "van Bolchoven, Jeroen A."
    }, 
    {
      "@type": "Person", 
      "affiliation": "Shell Technol Ctr Houston, 3333 Highway 6 South, Houston, TX 77083 USA", 
      "name": "Mesters, Carl"
    }
  ], 
  "datePublished": "2018-01-01", 
  "description": "Cu supported on SiO2 can be used to directly convert methane to methanol in a stepwise process with no intrinsic need for a zeolite support. Effects of parameters such as the O-2 activation temperature, activation time, CH4 reaction temperature, CH4 partial pressure (pCH(4)), and Cu wt % on methanol yield were investigated. Increasing the O-2 activation temperature in the 200-800 degrees C range significantly improved the methanol yield, and when carried out at 800 degrees C, a methanol yield of 11.5 mu mol/g(ctalyst) was obtained after reaction with methane at 200 degrees C for the sample with 2 wt % Cu. Yield per mole of Cu increased exponentially from 1.0 to 59.1 mmol with decreased Cu wt % from 30 to 1, respectively. The increase in the O-2 activation time also strongly influenced the yield which corresponded to the increase in yield by a factor of >2 between 1 and 8 h. Increasing PCH4 from 0.05 to 1 atm resulted in a 5-fold increase in yield after activation at 450 degrees C; however, it resulted in at least 20% lower yields after activation at 800 degrees C showing that active sites of different nature were formed at different activation temperatures. The increase in yield with ramped O-2 activation temperature correlated with the dehydration of the samples as evidenced by X-ray absorption near-edge spectroscopy (XANES) and via mass spectroscopy (MS) traces of H2O during the O-2 activation step.", 
  "headline": "Direct Stepwise Oxidation of Methane to Methanol over Cu-SiO2", 
  "identifier": 35659, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "Direct Stepwise Oxidation of Methane to Methanol over Cu-SiO2", 
  "url": "https://aperta.ulakbim.gov.tr/record/35659"
}