Cellulose Depolymerization over Heterogeneous Catalysts

Dehydrogenation by Heterogeneous Catalysts

Single-site heterogeneous catalysts.

Intellectually, the advantages that flow from the availability of single-site heterogeneous catalysts (SSHC) are many. They facilitate the determination of the kinetics and mechanism of catalytic turnover-both experimentally and computationally-and make accessible the energetics of various intermediates (including short-lived transition states). These facts in turn offer a rational strategic pr...

Cellobiose dehydrogenase, an active agent in cellulose depolymerization.

The ability of cellobiose dehydrogenase purified from Phanerochaete chrysosporium to modify a Douglas fir kraft pulp was assessed. Although the addition of cellobiose dehydrogenase alone had little effect, supplementation with cellobiose and iron resulted in a substantial reduction in the degree of polymerization of the pulp cellulose. When the reaction was monitored over time, a progressive de...

Mechanocatalytic Depolymerization of Cellulose With Perfluorinated Sulfonic Acid Ionomers

Here, we investigated that the mechanocatalytic depolymerization of cellulose in the presence of Aquivion, a sulfonated perfluorinated ionomer. Under optimized conditions, yields of water soluble sugars of 90-97% were obtained using Aquivion PW98 and PW66, respectively, as a solid acid catalyst. The detailed characterization of the water soluble fraction revealed (i) the selective formation of ...

Submitted to Cellulose About the Depolymerization of Cellulose Propionate to Segments with low DP

Low molecular weight cellulose propionate (CP) segments were synthesized by HBr hydrolysis under esterification conditions using either a commercial CP with residual hydroxyl groups (DSOH ca. 0.4) or a tripropionate (CTP). The hydrolysis using CTP yielded segments having a minimum DP of as low as 7, whereas the hydrolysis of the commercial CP resulted in segments having a minimum DP of 50. Diff...