A large amount of boil-off gas (BOG) is generated during the storage and transportation of liquefied natural gas,which results in not only resource wastage but also potential safety hazards.Therefore,the liquefied natural gas-adsorbed natural gas (LNG-ANG) coupling technology has attracted increasing attention from researchers.Developing efficient and stable adsorbents is the core key to the practical application of this technology.In view of the requirements of LNG-ANG coupling technology for adsorbents, this paper summarizes the research progress of metal-organic framework materials (MOFs) in methane adsorption at low temperature (about 159 K).By comparing the advantages and limitations of adsorption at low temperatures (159 K) with at room temperature (298 K),several MOFs materials that are more conducive to the adsorption and storage of methane are listed,including flexible MOFs,highly porous MOFs,hierarchically porous MOFs and MOF composites,aiming to offer references and guidance for the practical industrial application of MOFs in LNG-ANG coupling technology.

Potassium?cerium?lanthanum composite oxide catalyst was prepared by citric acid complexing combustion method.The influence of reaction conditions on catalyst activity was studied by temperature programmed reaction (TPR).The optimal reaction conditions during catalytic oxidation process of soot particles were investigated and determined.The contribution of each reaction condition to catalyst activity was analyzed and compared.The results show that the increase of O₂ concentration and catalyst?carbon ratio in exhaust gas are beneficial to the catalytic oxidation of soot particles.In the process of soot oxidation, the lower heating rate is more beneficial to improve the catalytic performance of the catalyst.The existence of water will partially deactivate the K?Ce?La composite oxide catalyst,which can be regenerated after drying.K?Ce?La composite oxide has good tolerance to the fluctuation of exhaust gas flow in a certain range.The contributions of reaction conditions to the catalytic activity of K?Ce?La composite oxides are as follows:catalyst?carbon ratio>contact mode>heating rate>water content>O₂ concentration>tail gas flow rate.