The last stage is methanogenesis or the alteration of hydrogen, carbon dioxide,
and ammonia into methane and carbon dioxide (Rodionova et al. 2016).
Production of molecular hydrogen is one of the most hopeful styles in the
assembly of sustainable energy. Biohydrogen utilize power fuel cells for power.
Photosynthetic organisms, for example, photosynthetic bacteria, cyanobacteria, and
green algae, as are skilled in the hydrogen production.
There are two key procedures to the creation of biohydrogen. In the first method
(indirect way) is used as the potential of photosynthesis. In some cyanobacteria and
green algae, direct water biophotolysis is followed in two stages:
H 2 O þ 2Fd ox ! 2H
þ
þ
1
2
O 2 þ 2Fd red
ð1:1Þ
2H
þ
þ 2Fd red $ H 2 þ 2Fd ox
ð1:2Þ
The first reaction happens in all oxygenic phototrophs, and then the next reaction
needs microaerobic or anaerobic situations. The H2 construction reaction is applied
by the bidirectional hydrogenase enzyme.
1.8 Research Records on Biofuel Production
Rezaei et al. used grape kernel oil for the making of biofuels by potassium hydroxide
and sodium hydroxide as catalysts and methanol. The extreme effectiveness of
biodiesel production for KOH (99%) and NaOH (95%) was obtained in ideal
situations, for example, methanol-to-oil ratio of 9:1, temperature of 70
C, 1 wt. %
catalyst, and 90 min. Table 1.6 shows several of the physicochemical attributes of
the biodiesel (Rezaei et al. 2017).
Alptekin et al. created methyl ester using fleshing oil attained from leather
industry fleshing wastes. The results showed the viscosity of the fleshing oil methyl
ester decreases with the increasing catalyst amount and methanol molar ratio and
catalyst quantity and (Fig. 1.11).
The viscosity impacts the quality of combustion. High viscosity may result in
incomplete combustion and increase the engine deposits, while low viscosity may
result in leakage in the fuel system.
Table 1.6 The physicochemical properties of biodiesel
(Rezaei et al. 2017)
Properties (units)
Biodiesel
USA
ASTM D6751
Flash point (
C)
160
<130
Viscosity at 40
C (cSt)
3.3
1.9–6
Cetane number (min)
52
47
Cloud point (
C)
–
–
Acid content (mg KOH/g)
0.20
0.5 max
1 Biofuel Production Technologies, Comparing the Biofuels and Fossil Fuels
17
and ammonia into methane and carbon dioxide (Rodionova et al. 2016).
Production of molecular hydrogen is one of the most hopeful styles in the
assembly of sustainable energy. Biohydrogen utilize power fuel cells for power.
Photosynthetic organisms, for example, photosynthetic bacteria, cyanobacteria, and
green algae, as are skilled in the hydrogen production.
There are two key procedures to the creation of biohydrogen. In the first method
(indirect way) is used as the potential of photosynthesis. In some cyanobacteria and
green algae, direct water biophotolysis is followed in two stages:
H 2 O þ 2Fd ox ! 2H
þ
þ
1
2
O 2 þ 2Fd red
ð1:1Þ
2H
þ
þ 2Fd red $ H 2 þ 2Fd ox
ð1:2Þ
The first reaction happens in all oxygenic phototrophs, and then the next reaction
needs microaerobic or anaerobic situations. The H2 construction reaction is applied
by the bidirectional hydrogenase enzyme.
1.8 Research Records on Biofuel Production
Rezaei et al. used grape kernel oil for the making of biofuels by potassium hydroxide
and sodium hydroxide as catalysts and methanol. The extreme effectiveness of
biodiesel production for KOH (99%) and NaOH (95%) was obtained in ideal
situations, for example, methanol-to-oil ratio of 9:1, temperature of 70
C, 1 wt. %
catalyst, and 90 min. Table 1.6 shows several of the physicochemical attributes of
the biodiesel (Rezaei et al. 2017).
Alptekin et al. created methyl ester using fleshing oil attained from leather
industry fleshing wastes. The results showed the viscosity of the fleshing oil methyl
ester decreases with the increasing catalyst amount and methanol molar ratio and
catalyst quantity and (Fig. 1.11).
The viscosity impacts the quality of combustion. High viscosity may result in
incomplete combustion and increase the engine deposits, while low viscosity may
result in leakage in the fuel system.
Table 1.6 The physicochemical properties of biodiesel
(Rezaei et al. 2017)
Properties (units)
Biodiesel
USA
ASTM D6751
Flash point (
C)
160
<130
Viscosity at 40
C (cSt)
3.3
1.9–6
Cetane number (min)
52
47
Cloud point (
C)
–
–
Acid content (mg KOH/g)
0.20
0.5 max
1 Biofuel Production Technologies, Comparing the Biofuels and Fossil Fuels
17