The process of CO2 hydrogenation into methanol has recently attracted more attention for reducing CO2, a main green-house gas in the atmosphere. In addition, methanol can be used as fuel or a basic chemical to satisfy the growing demand for energy in the world. In this study, the performance of NaA membrane reactor on the methanol yield and methanol selectivity obtained from the CO2 hydrogenation process was evaluated at different reaction conditions by varying the temperature, pressure, gas hourly space velocity (GHSV) and H2/CO2 ratio. The results show that the methanol yields and methanol selectivities obtained from the membrane reactor (MR) at all reaction conditions are higher than those from the traditional reactor (TR). The ratio of methanol yield in MR over methanol yield in TR are varied from 1.4 to 1.7 depending on the operating conditions. It is also observed that the use of membrane reactor is more efficient at low GHSV and the temperature in the range of 220–240°C.
In this study, the influence of Mn content on the NOx decomposition in the presence of oxygen over xMn/BaO/Al 2 O 3 catalysts (x is molar ratio of Mn/Ba) was investigated. Samples were characterized by N2 adsorption, XRD and SEM-EDX. The Mn loading, the dispersion of Ba on the surface and the BET surface area are the key factors affecting the NOx removal activity of the catalysts. The maximum conversion of NOx was obtained with 0.5 MnBa/Al sample. Lower and higher Mn loading resulted in a significant loss of the overall efficiency of NOx conversion. The lower NOx conversion at lower Mn loading (x=0.1) demonstrated that oxide manganese is the catalyst active site. The loss in efficiency observed at higher Mn loading is attributed to the lower dispersion of Ba on the surface, which could decrease the NOx storage ability, and the lower BET surface. There is no NOx conversion on support γ-Al 2 O 3 or Ba/γ-Al 2 O 3 .
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