| 摘要 |
A process for the direct oxidation of methane to C1-oxygenates (formaldehyde and methanol) has been developed. The process involves a gas stream, comprising methane, an oxidizing agent (such as air, or oxygen blended with an inert diluent), and a nitrogen oxide as a gas phase sensitizer at oxidation conditions to produce C1-oxygenates, such as formaldehyde and methanol. A certain proportion of nitrogen oxide, which acts as a radical initiator, in the stream is crucial to achieve a high yield of formaldehyde and methanol. In addition, the temperature plays an important role in the conversion of methane and in the selectivity to C1-oxygenates. |
| 主权项 |
1. A process for converting methane to formaldehyde and methanol in a single step, comprising contacting a mixture of gases comprising methane, oxygen, nitrogen, and a nitrogen oxide, the nitrogen oxide present at about 1 molar percent of the mixture of gases, wherein the process is continuous and set at a temperature of about 650° C., with atmospheric pressure, and a contact time of about 2 hours, wherein the mixture of gases has a N2:CH4:O2 molar ratio from about 3.8:1.9:1.0 to about 4.4:1.9:1.0, wherein methane, oxygen, nitrogen, and the nitrogen oxide concentration are fed into a fixed bed reactor independently and the mixture of gases is continuously flowed through a catalyst bed in the fixed bed quartz reactor with an approximately 10 mm internal diameter (ID) and an approximately 23 cm length, an inlet total flow of about 16.1 mLN/minute, and wherein the catalyst is selected from the group consisting of 0.5 wt % V2O5/SiO2, 0.5 wt % MoO3/SiO2, and 0.5 wt % Cu/ZSM-5. |
