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Effect of citric acid assisted hydrothermal dealumination on performance of Pt/Beta catalysts for selective ring opening of polycyclic aromatic hydrocarbons
Received date: 2020-12-15
Online published: 2021-07-08
Beta zeolites were post modified by hydrothermal treatment,citric acid treatment and duplex treatment,and the Pt/beta catalyst was prepared with the modified support.The physicochemical properties of the the modified and unmodified beta zeolites were characterized by X-ray diffraction（XRD）,X-ray fluorescence spectrometry（XRF）,temperature programmed desorption（NH3-TPD）,infrared pyridine adsorption（Py-IR）,framework aluminum nuclear magnetic resonance（27Al MAS NMR） and framework silicon nuclear magnetic resonance（29Si MAS NMR）,and the performance of the modified and unmod-ified Pt/beta on selective ring opening of polycyclic aromatic were investigated.The results showed that dealumination and re-alumination of Beta zeolite performed in citric acid treatment,leading to framework Al redistribution.In the process of hydro-thermal treatment,beta zeolite preferentially removed the framework aluminum at Si（2Al）,which had relatively low stability,and produced framework defects and a certain proportion of secondary mesoporous structure.The hydrothermal-citric acid du-plex treatment made a difference to framework aluminum addition and redistribution of beta zeolite.After hydrothermal treat-ment,there were more framework defects in beta molecular sieves,which could promote the framework supplement of active Al（OH）2+ species.When the hydrothermal-citric acid duplex treatment sequence was used for beta zeolite,the effect of frame-work aluminum supplement and framework aluminum redistribution was significant.The sample was mainly medium strong acid with a high ratio of B acid content to L acid content.The as-prepared catalyst had the best selective ring opening activity and stability for polycyclic aromatic hydrocarbons.
Jiazhong Zang , Mingchao Ma , Haibin Yu , Jingxin Fan , Chunlei Guo , Fengying Jin . Effect of citric acid assisted hydrothermal dealumination on performance of Pt/Beta catalysts for selective ring opening of polycyclic aromatic hydrocarbons[J]. Inorganic Chemicals Industry, 2021 , 53(6) : 205 -211 . DOI: 10.19964/j.issn.1006-4990.2020-0647
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