A series of CeO2-Al2O3, CeO2-TiO2, CeO2-ZrO2, and CeO2-SiO2 mixed-oxide supported copper catalysts were prepared by a modified deposition-precipitation method from ultra dilute aqueous solutions and were investigated ...A series of CeO2-Al2O3, CeO2-TiO2, CeO2-ZrO2, and CeO2-SiO2 mixed-oxide supported copper catalysts were prepared by a modified deposition-precipitation method from ultra dilute aqueous solutions and were investigated for hydrogenolysis of cellulose in aqueous medium, in the presence of hydrogen to produce sorbitol as major product. Among all the catalysts tested in the present work, CuO/CeO2ZrO2?catalyst proved to be the most promising with high conversion (92%) and excellent selectivity (sorbitol 99.1%), at an intermediate reaction temperature of 245°C in a neutral aqueous solution without an aid of liquid phase acid. The catalyst was recyclable in repeated runs and no deactivation was observed even after five reaction cycles. CuO/CeO2-ZrO2 has been characterized by XRD, SEM, TPR and BET surface area techniques.展开更多
The search for non-invasive or minimally invasive approaches for the treatment of cancer has led to the development of different therapeutic regimes and one such regime is photodynamic therapy(PDT).PDT is a non-therma...The search for non-invasive or minimally invasive approaches for the treatment of cancer has led to the development of different therapeutic regimes and one such regime is photodynamic therapy(PDT).PDT is a non-thermal treatment based on the synergy of three elements:the administration of a photosensitizer drug;light at a precise wavelength;and the presence of oxygen.When these three components are combined,they lead to the formation of reactive oxygen species(ROS),resulting in a complex cascade of events and subsequent cell death Studies revealed that PDT can prolong survival in patients with inoperable cancers and significantly improve the quality of life.With a number of recent technological improvements,PDT has the potential to become integrated into the mainstream strategy for cancer treatment.In this review,we have addressed the most important biological and physicochemical aspects of PDT,summarized its clinical status and provided an outlook for its potential future development.We also discussed the factors that hamper the exploration of this effective therapy and what should be changed to render it a more effective and more widely available option for patients.展开更多
文摘A series of CeO2-Al2O3, CeO2-TiO2, CeO2-ZrO2, and CeO2-SiO2 mixed-oxide supported copper catalysts were prepared by a modified deposition-precipitation method from ultra dilute aqueous solutions and were investigated for hydrogenolysis of cellulose in aqueous medium, in the presence of hydrogen to produce sorbitol as major product. Among all the catalysts tested in the present work, CuO/CeO2ZrO2?catalyst proved to be the most promising with high conversion (92%) and excellent selectivity (sorbitol 99.1%), at an intermediate reaction temperature of 245°C in a neutral aqueous solution without an aid of liquid phase acid. The catalyst was recyclable in repeated runs and no deactivation was observed even after five reaction cycles. CuO/CeO2-ZrO2 has been characterized by XRD, SEM, TPR and BET surface area techniques.
文摘The search for non-invasive or minimally invasive approaches for the treatment of cancer has led to the development of different therapeutic regimes and one such regime is photodynamic therapy(PDT).PDT is a non-thermal treatment based on the synergy of three elements:the administration of a photosensitizer drug;light at a precise wavelength;and the presence of oxygen.When these three components are combined,they lead to the formation of reactive oxygen species(ROS),resulting in a complex cascade of events and subsequent cell death Studies revealed that PDT can prolong survival in patients with inoperable cancers and significantly improve the quality of life.With a number of recent technological improvements,PDT has the potential to become integrated into the mainstream strategy for cancer treatment.In this review,we have addressed the most important biological and physicochemical aspects of PDT,summarized its clinical status and provided an outlook for its potential future development.We also discussed the factors that hamper the exploration of this effective therapy and what should be changed to render it a more effective and more widely available option for patients.
