Table 3 Degrees of saturation of the liquid products obtained from the deconstruction of n-hexadecane under hydrogen

From: Mechanistic classification and benchmarking of polyolefin depolymerization over silica-alumina-based catalysts

Entry

Catalyst

H2 (bar)

Time (h)

Conv. (%)

Saturated (%, δ = 0.25–2.0)

Unsaturated (%, δ = 2.0-6.0)

Aromatic (%, δ = 6.0-8.0)

1

ZSM-5_H

45

2

98.0 ± 2.0

87.4 ± 4.3

7.9 ± 2.6

4.8 ± 1.9

2

Co/ZSM-5_H

45

2

49.0 ± 3.7

99.4 ± 0.5

0.5 ± 0.4

0.1 ± 0.1

3

Ni/ZSM-5_H

45

2

85.6 ± 4.1

97.6 ± 0.8

2.3 ± 0.7

0.1 ± 0.1

4

Co/ZSM-5_H

45

6

93.1 ± 4.3

96.2 ± 1.8

3.1 ± 1.6

0.6 ± 0.2

5

Ni/ZSM-5_H

45

6

99.8 ± 0.2

99.9 ± 0.1

0.1 ± 0.1

0.1 ± 0.1

6

ZSM-5_H

30

2

99.8 ± 0.1

86.5 ± 0.5

8.8 ± 0.5

4.7 ± 0.1

7

ZSM-5_H

60

2

99.9 ± 0.1

88.1 ± 0.2

7.4 ± 0.2

4.5 ± 0.1

8

Ni/ZSM-5_H

30

2

99.5 ± 0.5

98.6 ± 0.8

1.0 ± 0.7

0.4 ± 0.1

9

Ni/ZSM-5_H

60

2

94.9 ± 2.2

99.9 ± 0.1

0.1 ± 0.1

0.1 ± 0.1

  1. Reaction conditions: n-hexadecane (1.59 g, 7.0 mmol), catalyst (0.1 g, metal loading = 2.5 wt%), 375 °C. Note that degrees of saturation are defined by the ratio of proton integrations in 1H NMR spectra to indicate the adjacent carbon-carbon bonds (saturated: δ = 0.25–2.0, unsaturated: δ = 2.0–6.0, and aromatics: δ = 2.0-6.0) given the C-H and C-C bond exclusivity of hydrocarbons.
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