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Application of new 13C n.m.r. techniques to the study of products from catalytic hydrodeoxygenation of SRC-II liquids

✍ Scribed by Don K. Dalling; Ghulam Haider; Ronald J. Pugmire; Joseph Shabtai; William E. Hull

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
579 KB
Volume
63
Category
Article
ISSN
0016-2361

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✦ Synopsis

A middle-heavy SRC-II distillate (b.p. 230455"C), containing 3.0 wt% of oxygen, has been studied by means of 13C n.m.r. at 75, 100 and 125 MHz. The magnetization refocussing techniques INEPT and J-resolved two-dimensional Fourier transform have been utilized to demonstrate methods by which resonance line multiplicities may be determined in complex liquid mixtures. Products derived from the above coal liquid by hydrodeoxygenation at temperatures from 200 to 370X, using sulphided CO-MO and Ni-W catalysts, were also examined. The fraction of aromatic carbon in the hydrotreated liquids was found to correlate directly with their C/H atomic ratio and inversely with the hydrogen content. Comparison of O/C atomic ratios with f, values for these liquids indicates that hydrogen uptake < 260°C is associated primarilywith hydrogenolytic oxygen removal without attendant ring hydrogenation, while at temperatures between 260 and 350°C hydrodeoxygenation is accompanied by ring hydrogenation and dealkylation reactions.

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