Jiajia Chen,Baobao Bai,Juan Lei,Peng Wang,Shuang Wang,Jinping Li
Mn 3 O 4 catalysts have shown great potentials for toluene catalytic oxidation for the spinel structure and weak metal oxygen bonds. In this work, Mn 3 O 4 and Mn 2 O 3 catalysts were obtained by using Mn-MOFs with different ligands as precursors. It was found that the reduction of hydroxyl groups in 2,5-dihydroxyterephthalic acid was favorable for the preparation of Mn 3 O 4 under the proper temperature range. The Mn 3 O 4 -MOF-74–300 catalyst exposed the highest Mn 3+ , O ads /O latt and reducing capacity. Herein, the Mn 3 O 4 -MOFs-74–300 catalyst exhibited excellent performance for toluene oxidation, which could achieve 90% toluene conversion at 218 ℃ (toluene concentration = 1000 ppm and SV = 20000 mL·g −1 ·h −1 ). Moreover, the Mn 3 O 4 -MOFs-74–300 catalyst exhibited high stability, circulation performance and water resistance in the catalytic test.
The hydroiodic acid was explored systematically to modify PbS quantum dots (QDs) ink process, which could remove trap states by hydroxyl ligand and improve iodine passivation on the PbS-QDs surface.
This strategy solved the essential question of PbS-QDs ink process and showed the favorable application prospects in QDs technology.
Hongyu Liang,Xiaojie Xia,Manqiang Liu,Shijing Zou,Tianqiang Yin,Hongfei Li,Yanhu Zhang,Chunying Min,Yongfeng Bu
High load-bearing capacity is one of the crucial indicators for liquid superlubricants to move toward practicality. However, some of the current emerging systems not only have low contact pressures but also are highly susceptible to further degradation due to water adsorption and even superlubricity failure. Herein, a novel choline chloride-based ionic liquid analogues (ILAs) of a superlubricant with triethanolamine (TEOA) as the H-bond donor is reported for the first time; it obtains an ultralow coefficient of friction (0.005) and high load-bearing capacity (360 MPa, more than 2 times that of similar systems) due to adsorption of a small amount of water (<5 wt %) from the air. In situ Raman combined with 1H NMR and FTIR techniques reveals that adsorbed water competes with the hydroxyl group of TEOA for coordination with Cl–, leading to the conversion of some strong H-bonds to weak H-bonds in ILAs; the localized strong H-bonds and weak H-bonds endow the ILAs with high load-bearing capacity and the formation of ultralow shear-resistance sliding interfaces, respectively, under the shear motion. This study proposes a strategy to modulate the interactions between liquid species using adsorbed water from air as a competing ligand, which provides new insights into the design of ILA-based macroscopic liquid superlubricants with a high load-bearing capacity.
危险品化学品经营许可证（带存储）