Platinum(Pt)supported on Zinc(Zn)modified silicalite-1(S-1)zeolite(denoted as Pt-Zn/S-1)was prepared by using a wetness-impregnation method and applied in the n-hexane aromatization reaction for the first time.Both Le...Platinum(Pt)supported on Zinc(Zn)modified silicalite-1(S-1)zeolite(denoted as Pt-Zn/S-1)was prepared by using a wetness-impregnation method and applied in the n-hexane aromatization reaction for the first time.Both Lewis and Bronsted acid sites were detected in Pt-Zn/S-1 catalyst by means of FT-IR adsorption of NH3 experiment,which were identified as mostly weak and medium ones.Besides,Pt and Zn species showed strong interaction,as revealed by the TPR(Temperature-programmed reduction)and XPS(X-ray photoelectron spectroscopy)experiments.Pt-Zn/S-1 catalyst exhibited excellent aromatization function rather than isomerization and cracking side reactions in the conversion of n-hexane.Pulse experimental study showed that 75.6%of n-hexane conversion and 76.8%of benzene selectivity were obtained over Pt0.1-Zn60/S-l catalyst at 550℃ and under atmospheric pressure.By spectroscopy tests and pulse experimental results,it was concluded that the n-hexane aromatization over Pt-Zn/S-1 catalyst follows a metal-acid bifunctional mechanism.Furthermore,with the assistance of Zn,the electron-deficient Pt species in Pt-Zn/S-1 showed good sulfur tolerance performance.展开更多
A mononuclear complex, cis-[meso-1, 3-bis(propylsulfinyl)propane]- dichloroplatinum(Ⅱ) (Pt(C9H20O2S2)Cl2) 1, has been prepared and structurally characterizated by single-crystal X-ray diffraction. The crystal belongs...A mononuclear complex, cis-[meso-1, 3-bis(propylsulfinyl)propane]- dichloroplatinum(Ⅱ) (Pt(C9H20O2S2)Cl2) 1, has been prepared and structurally characterizated by single-crystal X-ray diffraction. The crystal belongs to orthorhombic system, space group Pna21 with a = 22.800(3), b = 11.7662(13), c = 5.8115(6) ? V = 1559.0(3) ?, Mr = 490.36, Dc = 2.089 g/cm3, Z = 4, F(000) = 936, m (MoKa) = 9.596 mm-1 and l = 0.71073 ? The structure was refined to R = 0.0204 and wR = 0.0473 for 2703 reflections with I > 2(I). It is revealed that the central Pt(Ⅱ) ion in the title complex is bonded to two Cl atoms in a cis-configuration and two S atoms of the ligand to form the coordination geometry deviating slightly from the square planar.展开更多
基金financial support from the National Natural Science Foundation of China(No.21973013 and No.21673040)the National Natural Science Foundation of Fujian Province,China(No.2020J02025)+3 种基金the“Chuying Program”for the Top Young Talents of Fujian Provincesupported financially through a NWO/CW TOP grant(No.715.017.001)by a grant of supercomputer time from NWO Exacte en Natuurwetenschappen(NWO-ENW,No.2019.015)the National Science Foundation(No.CHE1951328)。
基金financially supported by the National Natural Science Foundation of China (21603023)
文摘Platinum(Pt)supported on Zinc(Zn)modified silicalite-1(S-1)zeolite(denoted as Pt-Zn/S-1)was prepared by using a wetness-impregnation method and applied in the n-hexane aromatization reaction for the first time.Both Lewis and Bronsted acid sites were detected in Pt-Zn/S-1 catalyst by means of FT-IR adsorption of NH3 experiment,which were identified as mostly weak and medium ones.Besides,Pt and Zn species showed strong interaction,as revealed by the TPR(Temperature-programmed reduction)and XPS(X-ray photoelectron spectroscopy)experiments.Pt-Zn/S-1 catalyst exhibited excellent aromatization function rather than isomerization and cracking side reactions in the conversion of n-hexane.Pulse experimental study showed that 75.6%of n-hexane conversion and 76.8%of benzene selectivity were obtained over Pt0.1-Zn60/S-l catalyst at 550℃ and under atmospheric pressure.By spectroscopy tests and pulse experimental results,it was concluded that the n-hexane aromatization over Pt-Zn/S-1 catalyst follows a metal-acid bifunctional mechanism.Furthermore,with the assistance of Zn,the electron-deficient Pt species in Pt-Zn/S-1 showed good sulfur tolerance performance.
基金This work was financially supported by the NSFC (No. 29971019)
文摘A mononuclear complex, cis-[meso-1, 3-bis(propylsulfinyl)propane]- dichloroplatinum(Ⅱ) (Pt(C9H20O2S2)Cl2) 1, has been prepared and structurally characterizated by single-crystal X-ray diffraction. The crystal belongs to orthorhombic system, space group Pna21 with a = 22.800(3), b = 11.7662(13), c = 5.8115(6) ? V = 1559.0(3) ?, Mr = 490.36, Dc = 2.089 g/cm3, Z = 4, F(000) = 936, m (MoKa) = 9.596 mm-1 and l = 0.71073 ? The structure was refined to R = 0.0204 and wR = 0.0473 for 2703 reflections with I > 2(I). It is revealed that the central Pt(Ⅱ) ion in the title complex is bonded to two Cl atoms in a cis-configuration and two S atoms of the ligand to form the coordination geometry deviating slightly from the square planar.
