**4. Application for partial oxidation of methane to methanol**

Catalytic test on partial oxidation of methane to methanol was carried out in a stainless steel vessel as a batch reactor, following the procedure reported previously [8]. The reactor schematic diagram is shown in **Figure 10**. The catalyst used for each reaction was 0.5 g, which was activated at 773 K prior to its use. The reaction was performed at 423 K with methane pressure of 0.75 bar and a nitrogen pressure of 2 bar with a variety of reaction time of 30 minutes and 60 minutes. After the vessel was cooled down to room temperature, the product was then extracted with ethanol and characterized with GC-FID using Carbowax column. Typical chromatogram of the extracted product is shown in **Figure 11**. Methanol was determined and quantized using additional standard method. In order to observe the effect of additional O2 gas to the reaction, similar experiment was carried out using gas mixture of methane: oxygen: nitrogen (0.75: 0.1: 1.9). After the amount of methanol produced was determined, the yield of methanol was calculated as follows:

name: oxhygen.\n\nToggen\n\n $(%.\mu\text{.}\nu\text{.}\text{.}1\text{.}\nu)$ .\n\nLet\ nie\n\n\n $\text{or}$  meu\n\n\n $\text{no}\text{.}\text{.}\text{.}\text{ is determined, the yield of methanol was calculated as follows:}$ 

$$\text{\%} \text{ Method Yield} = \frac{\text{mole methanol in reaction mixture}}{\text{mole methanoline in the input}} \times 100\% \text{\n} \tag{1}$$

### **Figure 10.**

*Schematic for reactor of partial oxidation of methane.*

### **Figure 11.**

*Example of chromatogram from the product mixture. [Reaction condition, 0.75 bar CH4, 2 bar N2 contains 0.5% O2; catalyst, 0.5 g Co/NaZSM-5 h; T, 150°C; t, 30 minutes].*
