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Batch Conversion of Methane to Methanol Using Copper Loaded Mordenite: Influence of the Main Variables of the Process
Conversión de metano a metanol por lotes usando mordenita intercambiada con cobre: influencia de las variables principales del proceso
Keywords:
methane, methanol, mild conditions, copper mordenite, solid state ion exchange, activation temperature, methane pressure, copper weight percent, (en)metano, metanol, condiciones suaves, mordenita de cobre, intercambio iónico en estado sólido, Temperatura de activación, presión de metano, por ciento en peso de cobre, (es)
Due to the demands of oxygenated derivatives of hydrocarbons for the industry, the methane (CH4) to methanol (MeOH) conversion through solid-state catalysis is a current topic, with definite questions and specific challenges. This work shows a statistical model that predicts the quantity of methanol produced through a batch conversion process employing copper-exchanged mordenite in accordance with a full factorial experimental design. Synthesis was performed through solid-state ion exchange from Cu(acac)2 and NH4-Mordenite, obtaining weight percentages (%Cu) of 1%, 3%, and 5%, which was followed by activation through calcination at a range of temperatures (Tcal) between 300-500 °C, as well as a reaction with methane under 2-10 bar pressure (P) in static conditions employing a batch reactor. The quantities of MeOH produced, and their yields were determined through a gas chromatography and mass spectrometry analysis of the reaction samples. Finally, the role and contribution of each of the variables considered in the conversion process were analyzed. By using a nonlinear model, a quadratic dependence with %Cu and P in the studied range of the variables was found, as well as a linear dependence with Tcal. Finally, for this experiment, the highest yields (µmol/g) were obtained with the following conditions: %Cu=3 %, P=6 bar, and Tcal=400 °C.
Debido a la demanda de derivados oxigenados de hidrocarburos para la industria, la conversión de metano (CH4) a metanol (CH3OH) por medio de catálisis en estado sólido es una cuestión de actualidad, precisa y con retos específicos. Este trabajo muestra un modelo estadístico que predice la cantidad de metanol producido por un proceso de conversión por lotes empleando mordenitas intercambiadas con cobre de acuerdo con un diseño experimental factorial. La síntesis fue realizada por intercambio iónico en estado sólido a partir de Cu(acac)2 y NH4-Mordenita, obteniendo porcentajes de intercambio en peso de Cobre (%Cu) de 1 %, 3 % y 5 %, seguido de una activación por calcinación en el rango de temperaturas (Tcal) de 300-500 °C, así como una reacción con metano en el rango de presiones de 2-10 bar (P) bajo condiciones estáticas con un reactor por lotes. Las cantidades de MeOH producidas y sus rendimientos fueron determinados usando análisis de cromatografía de gases y espectrometría de masas de las muestras de la reacción. Finalmente se analizaron el papel y la contribución de cada una de las variables consideradas en el proceso de conversión. Usando un modelo no lineal, se encontró una dependencia cuadrática del %Cu y P en el rango estudiado de cada variable, así como una dependencia lineal con Tcal. Finalmente, para este experimento, los mayores rendimientos (μmol/gr) se obtuvieron con las siguientes condiciones: %Cu=3%, P=6 bar y Tcal=400 °C.
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