C9 petroleum resin is a thermoplastic polymer produced by polymerization of C9 fraction obtaining from the steam cracking unit, and could be catalytic hydrogenated to remove the ethylenic C=C bond, aromatic ring with improved physical properties. The research progress in the efficiency supported nickel or/and palladium catalysts for C9 petroleum resin hydrogenation was illustrated and reviewed, further development was discussed.

The current situation and hot spots of sepiolite research were explored to provide reference for the further work in China. All literature related to sepiolite in CNKI database were searched in the past ten years. CiteSpace 5.6.R3 software was used to analyze the research situation from the perspective of the annual publication volume of key institution authors and other aspects in combination with the literature visualization function of HowNet. A total of 1084 papers were analyzed, and the overall number of publication was risen from 2010 to 2020. The research institute of Environmental Protection, Ministry of Agriculture, Hebei University of Technology, Xiangtan University were in the top list. The high-frequency authors were Xu Yingming, Liang Xuefeng, Qin Xu. Keyword analysis showed the main research hotspots were sepiolite adsorption and modification.