Kinetic Modeling for the “One-Pot” Hydrogenolysis of Cellulose to Glycols over Ru@Fe3O4/Polymer Catalyst

Despite numerous works devoted to the cellulose hydrogenolysis process, only some of them describe reaction kinetics. This is explained by the complexity of the process and the simultaneous behavior of different reactions. In this work, we present the results of the kinetic study of glucose hydrogenolysis into ethylene- and propylene glycols in the presence of Ru@Fe3O4/HPS catalyst as a part of the process of catalytic conversion of cellulose into glycols. The structure of the Ru-containing magnetically separable Ru@Fe3O4/HPS catalysts supported on the polymeric matrix of hypercrosslinked polystyrene was studied to propose the reaction scheme. As a result of this study, a formal description of the glucose hydrogenolysis process into glycols was performed. Based on the data obtained, the mathematical model of the glucose hydrogenolysis kinetics in the presence of Ru@Fe3O4/HPS was developed and the parameter estimation was carried out. The synthesized catalyst was found to be characterized by the enhanced magnetic properties and higher catalytic activity in comparison with previously developed catalytic systems (i.e., on the base of SiO2). The summarized selectivity towards the glycols formation was found to be ca. 42% at 100% of the cellulose conversion in the presence of Ru@Fe3O4/HPS.

FUNCTIONALIZATION OF THE SURFACE OF HYPERCROSSLINKED POLYSTYRENE FOR CATALYST SYNTHESIS

Нанесенные наноразмерные катализаторы широко используются в различных процессах химической технологии. При этом особые требования предъявляются к носителю, используемому при синтезе катализаторов. Сверхсшитые полимеры являются перспективными носителями, однако зачастую не имеют требуемых свойств (например, кислотности). Для придания дополнительных свойств возможно модифицировать поверхность полимеров различными веществами или функциональными группами. В данной работе проведено исследование способов модификации и веществ-предшественников кремнийсодержащей фазы для модификации поверхности сверхсшитого полистирола диоксидом кремния. The supported nano-scale catalysts are widely used in different fields of chemical engineering. For the catalysts, the certain requirements are specified fort the catalyst supports. Hypercrosslinked polymers seem to be the prospective materials for the catalyst synthesis. However, polymeric matrices often do not meet some standards for catalyst supports (i.e. polymers are inert materials and do not have the acidic or basic properties). To infuse the additional properties to polymers it is possible to modify its surface with different compounds or functional groups. In this work, the study of the ways for the modification of the surface of hypercrosslinked polystyrene and silica-phase precursors was carried out.

Iron-Containing Hypercrosslinked Composite Prepared From Polystyrene Foam Plastic in the Sorption of Toxic and Foul-Smelling Substanc

A convenient method for obtaining an iron-containing hypercrosslinked polystyrene composite based on foam plastic waste is developed. The iron-containing composite can be used for the sorption of hydrogen sulfide, toxic organic solvents, as well as foul-smelling and toxic products of degradation of natural remains—putrescine, cadaverine, indole, and skatole.

HYDROLYTIC OXIDATION OF CELLOBIOSE IN THE PRESENCE OF A Pt-CONTAINING POLYMERIC CATALYST

В данной работе приводятся результаты исследования процесса гидролитического окисления целлобиозы (4-(β-глюкозидо)-глюкозы) в присутствии гетерогенного Pt-содержащего катализатора на основе мезопористой матрицы сверхсшитого полистирола (СПС). Исследования процессов гидролитического окисления дисахаридов являются первым шагом к разработке технологий прямой конверсии растительных полисахаридов, в первую очередь, целлюлозы, в альдоновые и альдаровые кислоты, широко использующиеся в химическом синтезе и различных областях промышленности. This work presents the results of a study of the process of hydrolytic oxidation of cellobiose (4- (β-glycoside) -glucose) in the presence of a heterogeneous Pt-containing catalyst based on a mesoporous matrix of hypercrosslinked polystyrene (HPS). Studies of the processes of hydrolytic oxidation of disaccharides are the first step towards the development of technologies for the direct conversion of plant polysaccharides, primarily cellulose, into aldonic and aldaric acids, which are widely used in chemical synthesis and various industries.

Role of ultramicropore on the remarkable gas storage in hypercrosslinked polystyrene networks studied by positron annihilation

In this paper, hypercrosslinked polystyrene (HCLPS) networks were synthesized by radical bulk polymerization and Friedel-Crafts alkylation reaction using vinylbenzyl-co-divinylbenzene chloride (VBC-DVB) as the precursors. A series of HCLPS were prepared...