Catalytic Materials

Effect of citric acid assisted hydrothermal dealumination on performance of Pt/Beta catalysts for selective ring opening of polycyclic aromatic hydrocarbons

  • Jiazhong Zang ,
  • Mingchao Ma ,
  • Haibin Yu ,
  • Jingxin Fan ,
  • Chunlei Guo ,
  • Fengying Jin
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  • 1. CenerTech Tianjin Chemical Research and Design Institute Ltd.,Co.,Tianjin 300131,China
    2. Tianjin Refining and Catalytic Technology Engineering Center

Received date: 2020-12-15

  Online published: 2021-07-08

Abstract

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.

Cite this article

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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