Hollow silica nanospheres (HSNs) have been widely used as antireflection coatings. However, it is difficult to incorporate them into optical polymer matrices because of their larger size and agglomerations problem, making the haze and transparency worse. Herein, the sub-20 nm HSNs were firstly synthesized by a reverse microemulsion method and the scale-up preparation was successfully achieved in a rotating-packed-bed reactor. The prepared nanocomposites possess super-high transparency and almost unchanged haze.

A novel double H-bonds multimer absorbent for H2S absorption was designed via intermolecular self-assembly using DBU and EG under the guidance of QCC. The formation mechanisms of multimer absorbents and the absorption mechanisms between those absorbents and H2S were explored by QCC and experiments. It was found that the formed DBU-2EG multimer absorbent at the DBU/EG molar ratio of 1:2 has two intermolecular H-bonds with different strengths between DBU and EG, which can combine with H2S via weak H-bond. Furthermore, the characteristics analysis of multimer absorbents confirmed the above mechanisms. Experimental results indicated that the DBU-2EG has the highest H2S solubility of 2.64 mol/mol (DBU) with a low viscosity value of 15.12 mPa·s at 25 ℃ and desorption temperature below 60 ℃ at 100 kPa. The multimer absorbent exhibits great potential in the H2S capture process. In addition, this research provides an effective strategy for the design of absorbents.

The scale-up synthesis of covalent organic frameworks (COFs) with uniform structure and properties is of great importance for their practical applications. Here, we proposed a facile way to massively produce phthalocyanine-like COFs (COFBTC) via high-gravity intensified synthesis. Alcoholic solvent and basic catalyst were discovered synergically improved the formation of COFBTC. High concentration and reaction temperature were beneficial for high production as well. The intensified mass and heat transfer at high gravity (HiGee) environment promoted the scaling-up of COFBTC with homogeneous structures and properties. A high space time yield of 305.9 kg∙(m3∙D)-1 was achieved for Fe-COFBTC under optimized condition. The massively produced Fe-COFBTC presented good solubility in alkaline and polar organic solvents, thus allow to process as homogeneous or heterogenous electrocatalyst for oxygen reduction reaction. The catalyst exhibited good performance of 0.79 V (vs. RHE, half-wave) and >95% recovery in homogeneous electroreduction of O2 in 0.1 M KOH.

First principles studies combined with the microkinetic analysis were performed to study the reliability and reaction mechanisms of single-atom doped graphene (SADGr) materials in catalyzing NOx reduction with CO. By screening the 3d transition metals (Sc-Zn) and group-IV elements (Si and Ge), it was found that the Ti and Co doped graphene sheets (TiGr and CoGr) respectively own excellent catalytic activities in the NO/NO2-to-N2O and the N2O-to-N2 processes at low temperatures. Therefore, the TiGr/CoGr composite can be a promising catalyst in NOx reduction with CO. It was further revealed the combination of adsorption energy and electronegativity was a good descriptor to predict the activation energies. The obtained results can provide useful information for rational design of carbon-based single-atom catalysts for NOx reduction by CO at low temperatures.

In this study, PS was synthesized by gaseous SO3 sulfonation of distillate oil in a rotating packed bed. The chemical compositions of the prepared PS and its raw material (distillate oil) were obtained by the combined analysis of the double-bond equivalent and carbon number at the molecular level. In addition, the EOR performance of PS has been studied by measuring surface tension, interfacial tension (IFT), wettability alteration and core-flooding experiments. An ultra-low IFT value 1.327×10-3 mN/m between the crude oil and prepared PS solution was obtained at the critical micelle concentration (CMC) of PS solution. Core flooding experiments showed that additional oil recoveries of 28.10% and 30.77% were obtained at PS concentrations of 0.3% and 0.6% respectively after conventional water flooding, indicating the prepared PS has good performance on EOR.