Perovskites as substitutes of noble metals for heterogeneous catalysis: dream or reality.

Heterogeneous catalytic wet air oxidation of refractory organic pollutants in industrial wastewaters: a review.

Transforming plant biomass to biofuel is one of the few solutions that can truly sustain mankind's long-term needs for liquid transportation fuel with minimized environmental impact. However, despite decades of effort, commercial development of biomass-to-biofuel conversion processes is still not an economically viable proposition. Identifying value-added co-products along with the production of biofuel provides a key solution to overcoming this economic barrier. Lignin is the second most abundant component next to cellulose in almost all plant biomass; the emerging biomass refinery industry will inevitably generate an enormous amount of lignin. Development of selective biorefinery lignin-to-bioproducts conversion processes will play a pivotal role in significantly improving the economic feasibility and sustainability of biofuel production from renewable biomass. The urgency and importance of this endeavor has been increasingly recognized in the last few years. This paper reviews state-of-the-art oxidative lignin depolymerization chemistries employed in the papermaking process and oxidative catalysts that can be applied to biorefinery lignin to produce platform chemicals including phenolic compounds, dicarboxylic acids, and quinones in high selectivity and yield. The potential synergies of integrating new catalysts with commercial delignification chemistries are discussed. We hope the information will build on the existing body of knowledge to provide new insights towards developing practical and commercially viable lignin conversion technologies, enabling sustainable biofuel production from lignocellulosic biomass to be competitive with fossil fuel.

Catalytic Oxidation of Biorefinery Lignin to Value‐added Chemicals to Support Sustainable Biofuel Production

Simultaneous reduction of Cr(VI) and degradation of tetracycline hydrochloride by a novel iron-modified rectorite composite through heterogeneous photo-Fenton processes

The main characteristics of aqueous dispersions of nanoparticles are considered. One of the results of the work is the synthesis of calcium zirconate nanoparticles. The particles were obtained by the solution combustion method and analyzed by X-ray diffraction and X-ray fluorescence methods. The next step is to preparation of aqueous dispersion based on the synthesized nanoparticles, conducts studies on their stability, and carried out experiments to study the process of dispersion boiling. As a result, a conclusion has been made about a promising method of fixing nanoparticles on the heating surface. The obtained results showed that the heat exchange efficiency at the flat vertical heater is depended on exposure in the bubble boiling regime. The choice of nanoparticles and their concentration also have a significant influence at the discovered effect.

Санкт-Петербургский государственный университет культуры и искусств

Removal of salicylic acid on perovskite-type oxide LaFeO3 catalyst in catalytic wet air oxidation process

Ruthenium catalysts supported on high-surface-area zirconia for the catalytic wet oxidation of N,N-dimethyl formamide

Activity and leaching features of zinc-aluminum ferrites in catalytic wet oxidation of phenol.

Rectorite as catalyst for wet air oxidation of phenol

Catalytic wet air of coke-plant wastewater was studied in a bubbling bed reactor. Two types of supported Ru-based catalysts, eggshell and uniform catalysts, were employed. Compared with the results in the wet air oxidation of coke-plant wastewater, supported Ru uniform catalysts showed high activity for chemical oxygen demand (COD) and ammonia/ammonium compounds (NH3-N) removal at temperature of 250 °C and pressure of 4.8 MPa, and it has been demonstrated that the catalytic activity of uniform catalyst depended strongly on the distribution of active sites of Ru on catalyst. Compared to the corresponding uniform catalysts with the same Ru loading (0.25wt.% and 0.1wt.%, respectively), the eggshell catalysts showed higher activities for CODcr removal and much higher activities for NH3-N degradation. The high activity of eggshell catalyst for treatment of coke-plant wastewater can be attributed to the higher density of active Ru sites in the shell layer than that of the corresponding uniform catalyst with the same Ru loading. It has been also evidenced that the active Ru sites in the internal core of uniform catalyst have very little or no contribution to CODcr and NH3-N removal in the total oxidation of coke-plant wastewater.

Aihua Xu

Papers

Removal of salicylic acid on perovskite-type oxide LaFeO3 catalyst in catalytic wet air oxidation process

Ruthenium catalysts supported on high-surface-area zirconia for the catalytic wet oxidation of N,N-dimethyl formamide

Activity and leaching features of zinc-aluminum ferrites in catalytic wet oxidation of phenol.

Rectorite as catalyst for wet air oxidation of phenol

Catalytic Wet Air Oxidation of Coke-Plant Wastewater on Ruthenium-Based Eggshell Catalysts in a Bubbling Bed Reactor