Acrylic acid cucurbit [7]uril ester (ACE) was prepared and utilized to react with acrylamide (AM) and hexadecyl dimethyl allyl ammonium chloride (C 16 DMAAC) to synthesize a novel AM copolymer (AM/ACE/C 16 DMAAC) through redox free-radical polymerization in aqueous solution. The chemical structure of AM/ACE/C 16 DMAAC was confirmed by Fourier transform IR and 1 H NMR spectroscopies. Characterizations consisted of scanning electron microscopy, thermogravimetric analysis, and static light scattering, and the performance evaluations were conducted on several aspects such as intrinsic viscosity, stability, viscoelasticity, adsorption, and core-flooding experiments. Experiment results demonstrated the introduced ACE group could improve the salt tolerance and temperature resistance of polymer. Moreover, AM/ACE/C 16 DMAAC could significantly increase the oil recovery of 21.43%. The superior performances of AM/ACE/C 16 DMAAC revealed a potential application in high-temperature and high-mineralization oilfields for enhanced oil recovery.

A series of Mg‐modified SBA‐15 mesoporous silicas with different MgO contents were successfully synthesized by a simple one‐pot synthesis method and further impregnated with Ni. The Mg‐modified SBA‐15 materials and supported Ni catalysts were characterized by N2 physisorption (BET), X‐ray diffraction (XRD), temperature‐programmed desorption of CO2 (CO2‐TPD), temperature‐programmed H2 reduction (H2‐TPR), and temperature‐programmed hydrogenation (TPH) techniques and used for methane dry reforming with CO2. CO2‐TPD results proved that the addition of Mg increased the total amount of basic sites which was responsible for the enhanced catalytic activity over the Mg‐modified Ni catalyst. The excellent catalytic stability of Ni/8Mg‐SBA‐15 was ascribed to less coking and higher stability of the Ni particle size due to the introduction of Mg.

No abstract

No abstract