598
C 2 H 5 OH decomposition to CH 4 , CO, H 2 : C 2 H 5 OH  →  CH 4   +  CO  +  H 2
(ΔH = +49 kJ/mol).
C 2 H 5 OH dehydration to C 2 H 4 : C 2 H 5 OH → C 2 H 4  + H 2 O (ΔH = +45 kJ/mol).
C 2 H 5 OH dehydrogenation to C 2 H 4 O: C 2 H 5 OH → C 2 H 4 O + H 2 (ΔH = +68 kJ/mol).
C 2 H 4 O decomposition to CH 4 and CO or steam reforming of C 2 H 4 O:
C 2 H 4 O → CH 4  + CO.
C 2 H 4 O → H 2 O + 3H 2  + CO.
Water-gas shift reaction: CO + H 2 O ↔ CO 2  + H 2 (ΔH = −41.2 kJ/mol).
Methane steam reforming: CH 4  + H 2 O ↔ CO + 3H 2 (ΔH = +206.2 kJ/mol).
Methanation:
CO + 3H 2  ↔ CH 4  + H 2 O (ΔH = −251 kJ/mol).
CO 2  + 4H 2  ↔ CH 4  + 2H 2 O.
Deposition of carbon:
CH 4  → C + 2H 2 (Methane decomposition).
2CO → CO 2  + C (Boudouard reaction) (ΔH = −171 kJ/mol).
C 2 H 4  → 2C + 2H 2 or polymerization to coke.
Acetone may form due to aldol condensation in some cases:
2C 2 H 5 OH + H 2 O ↔ CH 3 COCH 3  + CO + 4H 2 .
Table 2 MSR activity of different mesoporous catalysts
Catalysts
Metal
(wt%)
Temperature
(°C)
CH 3 OH
conversion (%)
H 2 selectivity
(%)
References
Pd-Zn/SBA-15
Pd (4.5)
Zn (6.75)
300
65
85
[61]
Cu-Ce 0.75 Zr 0.25 O 2 Cu (9)
300
100
60
[62]
Cu-MCM-41
Cu (10)
350
82.3
99.5
[33]
Ce-Cu/KIT-6
(CT)
Cu (10)
Ce (2)
300
92.2
99.2
[63]
Pd-TiO 2
Pd (10)
350
98
95
[65]
CuZnCeZrSBA- 15
Cu (10)
Ce (2)
Zr (2)
Zn (5)
300
91
88.2
[66]
Cu-MCM-41
Cu (15)
350
96.4
100
[34]
Cu-MCM-41
Cu (10)
300
69.9
100
[72]
Pd-MCM-41
Pd (10)
300
69.0
98.5
[72]
Sn-MCM-41
Sn (10)
300
39.1
74.8
[72]
Zn-MCM-41
Zn (10)
300
35.6
98.5
[72]
Ni-MCM-41
Ni (10)
300
22.1
99.6
[72]
Co-MCM-41
Co (10)
300
14.4
98.2
[72]
S. Bepari et al.