Highly active and selective Li/MgO catalysts for methane transformation to C₂ hydrocarbons: experimental and DFT study

Abstract

Development of energy-efficient and economically attractive ways of utilization of methane for the production of chemicals/ liquid fuels remains one of the long-standing challenges in catalysis. Li/MgO catalysts synthesized by...

Visible-Light-Driven Toluene Oxidation to Benzaldehyde over WO3 Nanostructures

“…This means that oxygen removal is relatively facile on the WO 3 (100) surface than on the WO 3 (110) surface, resulting in a greater concentration of oxygen vacancy sites on the WO 3 (100) surface. The presence of oxygen vacancies has been shown to be important for the activation of the C–H bond in our previous study on the oxidation of cyclohexane to KA oil and adipic acid, , the oxidation of benzene to phenol, and oxidative methane coupling to ethylene. , …”

“…The presence of oxygen vacancies has been shown to be important for the activation of the C−H bond in our previous study on the oxidation of cyclohexane to KA oil and adipic acid, 47,48 the oxidation of benzene to phenol, 49 and oxidative methane coupling to ethylene. 50,51 The adsorption of molecular O 2 over oxygen vacancies on WO 3 (100) and WO 3 (110) surfaces was studied and is displayed in Figure 6a and 6b, respectively. Molecular O 2 shows a strong binding affinity toward the WO 3 (100) surface with an adsorption energy of −8.80 eV at the oxygen vacancy site.…”

Low temperature reforming of methane with CO2 over Pt/CeO2, Ni/CeO2 and Pt–Ni/CeO2 catalysts prepared by a solution-combustion method

“…9,48,56 The oxygen vacancies can generally trap peroxide (O 2 2− ) and superoxide (O 2 − ) oxygen species, but O 2 2− species are EPR silent due to the lack of unpaired electrons. 48,58 However, the intensities of the signals are different for all the catalysts. NPC catalysts had a higher intensity followed by NC and PC catalysts.…”

Surfactant-Assisted Preparation of Nanorod La2O3 Catalysts for Oxidative Coupling of Methane

“…The oxidative coupling of methane (OCM), as one of the direct CH 4 conversion routes to high value-added C 2 H 4 and C 2 H 6 , has attracted great attention since the early 1980s. 1,2 During the past 40 years, hundreds of catalysts including Li/ MgO, 3,4 Mn/Na 2 WO 4 /SiO 2 , 5−8 rare earth metal oxides, 9−12 and perovskites 13−15 have been extensively investigated for the OCM reaction. Mn−Na 2 WO 4 /SiO 2 was recognized as the most promising catalyst for its outstanding C2+ selectivity.…”

“…The oxidative coupling of methane (OCM), as one of the direct CH 4 conversion routes to high value-added C 2 H 4 and C 2 H 6 , has attracted great attention since the early 1980s. , During the past 40 years, hundreds of catalysts including Li/MgO, , Mn/Na 2 WO 4 /SiO 2 , − rare earth metal oxides, − and perovskites − have been extensively investigated for the OCM reaction. Mn–Na 2 WO 4 /SiO 2 was recognized as the most promising catalyst for its outstanding C2+ selectivity. − Nevertheless, the high ignition temperature (T ≥ 750 °C) would result in high thermal stress on the catalyst and the loss or sintering of active components, , thus shortening the lifetime for its application in industry.…”