Physicochemical and isomerization property of Pt/SAPO-11 catalysts promoted by rare earths
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：LIU Weiqiao SUN Yuhan SHANG Tongming REN Jie ZHOU Quanfa
Key words：Pt/SAPO-11 catalyst; n-heptane; hydroisomerization; rare earths;
Abstract: Monometallic catalyst Pt/SAPO-11 was prepared by impregnation method. Bimetallic catalysts LaPt/SAPO-11 or CePt/SAPO-11 was prepared by sequential impregnation method. The catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption, tem-perature-programmed desorption of ammonia (NH_3-TPD), and Fourier transform infrared spectroscopy (FT-IR) techniques. The results showed that with the addition of rare earths the BET surface areas, pore volume, the amount of Bronsted acid and the total acidity of catalysts decreased slightly. However, the additive addition could lead to an increase in the amount of Lewis acid. Meanwhile, the introduction of ad-ditive was feasible to promote the dispersity of Pt. In addition, the hydroisomerization of n-heptane over different catalysts was studied.Compared with Pt/SAPO-11, LaPt/SAPO-11 or CePt/SAPO-11 showed higher catalytic activity and yield of i-C_7 due to its higher Pt dispersion.
LIU Weiqiao1，SUN Yuhan2，SHANG Tongming1，REN Jie2，ZHOU Quanfa1
(1.School of Chemistry and Chemical Engineering,Jiangsu Teachers University of Technology,Changzhou 213001,China;
2.Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)
Abstract:Monometallic catalyst Pt/SAPO-11 was prepared by impregnation method. Bimetallic catalysts LaPt/SAPO-11 or CePt/SAPO-11 was prepared by sequential impregnation method. The catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption, tem-perature-programmed desorption of ammonia (NH_3-TPD), and Fourier transform infrared spectroscopy (FT-IR) techniques. The results showed that with the addition of rare earths the BET surface areas, pore volume, the amount of Bronsted acid and the total acidity of catalysts decreased slightly. However, the additive addition could lead to an increase in the amount of Lewis acid. Meanwhile, the introduction of ad-ditive was feasible to promote the dispersity of Pt. In addition, the hydroisomerization of n-heptane over different catalysts was studied.Compared with Pt/SAPO-11, LaPt/SAPO-11 or CePt/SAPO-11 showed higher catalytic activity and yield of i-C_7 due to its higher Pt dispersion.
Key words:Pt/SAPO-11 catalyst; n-heptane; hydroisomerization; rare earths;
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