1. Catalytic Partial Oxidation of Methane to Syngas and the DME Synthesis
from the Syngas Containing N2
we try to use air instead of pure oxygen for a syngas production by CPO without an air-separation installation. The key question induced by air CPO is whether the syngas containing N2 could be effectively used for the downstream product synthesis. For methanol synthesis, since a great deal of feedstock needs to be recycled for its low single pass conversion, the existence of N2 which causes a large increase of compression cost of gases, is clearly unfit for its requirement. But for dimethyl ether, A great deal of experimental results have provided that the single pass CO conversion could be reached to 90% over many kinds of catalysts, which means the feedstock gases no longer need to be recycled. Therefore, we have done a lot of work on an integration of the air CPO with the DME synthesis from syngas containing N2, and to see whether it could offer a cheaper route for DME production.

2. Catalytic Partial Oxidation of Methane and Air
The effects of temperature on catalytic activities
T/℃
CH4
CO2
H2O CO H2 N2
500
14.43
7.69
25.09
0.60
9.66
42.53
550
12.79
7.96
22.72
1.39
13.70
41.45
600
10.74
7.88
20.17
2.80
18.32
40.09
650
8.33
7.30
17.65
4.94
23.28
38.51
700
5.78
6.33
15.34
7.56
28.17
36.82
750
3.46
5.24
13.45
10.16
32.41
35.29
800
1.74
4.31
12.17
12.20
35.43
34.15
850
0.75
3.65
11.56
13.50
37.05
33.50
(CH4/Air/H2O=1/2.4/0.8，0.8MPa)
The effects of H2O/CO2 ratios on catalytic activities R
CH4
CO2
H2O CO H2 N2
12/0
0.44
4.43
15.85
11.67
36.19
31.42
11/1
4.93
15.50
12.80
34.87
31.45
10/2
0.46
5.38
14.95
14.03
33.80
31.39
9/3
0.45
5.89
14.57
15.17
32.51
31.41
8/4
0.43
6.48
14.31
16.23
31.10
31.46
(R=H2O/CO2，850℃，1MPa，(H2O+CO2)/ CH4 =1.2/1)

3. DME Synthesis from the Syngas Containing N2
CH4
The catalyst stability for CPO of methane with air
(850℃，0.8MPa，Natural gas/Air/H2O/CO2＝1/2.4/0.8/0.4)
DME Synthesis from the Syngas Containing N2
7.0MPa
The influence of temperature on catalytic properties

4. The influence of space velocity on catalytic properties
5.0MPa
5.0MPa
The catalyst stability for DME synthesis

5. Electricity
Catalytic Combustion
CH4
Air
DME Synthesis
Reactor
Syngas
(N2)
Compressor
Tail gas
H2O
H2O
DME
Compressor
CO2
CO2
The process of DME synthesis from syngas obtained by catalytic partial oxidation of methane with air

6. Catalytic Partial Oxidation of Methane in Fluidized Bed Reactor
The temperature profiles in fluidized bed
The results of CPO in fluidized compared with the data calculated by thermodynamic

7. The results of catalytic oxidation of methane along catalyst bed
The comparison of the results of carbon deposition in fixed bed and fluidized bed

8. The catalyst stability for CPO in fluidized bed
The results of catalytic oxidation of methane and methane reforming with carbon dioxide along catalyst bed
The catalyst stability for CPO in fluidized bed