Citation: YU Feng, GUO Min, WANG Xu, PAN Da-hai, LI Rui-feng. Synthesis of well-ordered SO₄^2-/ZrO₂-SiO₂ materials in bi-acid system[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(4): 456-462. shu

Synthesis of well-ordered SO₄^2-/ZrO₂-SiO₂ materials in bi-acid system

YU Feng ¹ ,
GUO Min ¹ ,
WANG Xu ¹ ,
PAN Da-hai ¹ ,
LI Rui-feng ^1,2,,

1.
1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

Corresponding author: LI Rui-feng,
Received Date: 17 December 2012
Available Online: 3 February 2013
Fund Project: Supported by the Natural Science Foundation of China (NSFC, 50772070, 51172154) (NSFC, 50772070, 51172154) the Research Fund for the Doctoral Program of Higher Education (20121402120011) (20121402120011)the Science and technological program of Shanxi Province (20110008) (20110008)

A series of solid acid SO₄^2-/ZrO₂-SiO₂ catalysts with a fixed Zr/Si molar ratio of 1.1 were successfully synthesized in one-pot through changing the H₂SO₄/HCl volume ratio during the self-assembly process. X-ray diffraction (XRD), UV-visible DRS, and high resolution transmission electron microscopy (HRTEM) results demonstrate that all the resultant catalysts exhibit a highly ordered 2D hexagonal mesostructures with zirconia particles of homogenously distributed tetragonal nanocrystallites in mesoporous walls. N₂ adsorption and pyridine in-situ Fourier-transformed infrared spectra (FT-IR) further reveal that the surface area, pore volume, pore diameter and the relative strength of Lewis and Brønsted acidic sites of resultant catalysts can be controlled by tuning the H₂SO₄/HCl volume ratio during the synthesis. Different from pure mesoporous SBA-15 material, the mesoporous SO₄^2-/ZrO₂-SiO₂ materials prepared in this work exhibit high structural stability and catalytic activity in n-pentane isomerization, which is attributed not only to hydrochloric acid that facilitates the formation of mesoporous silica but also to sulfuric acid that helps to stabilize the structure of catalysts and produce acid sites. The methods proposed in this work provide an important approach to synthesize ordered solid acid catalysts with high stability and potential applications in various acidic-catalyzed reactions.
- zirconia,
- mesoporous materials,
- one-pot synthesis,
- isomerization,
- solid acid catalyst
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Synthesis of well-ordered SO42-/ZrO2-SiO2 materials in bi-acid system

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Synthesis of well-ordered SO₄^2-/ZrO₂-SiO₂ materials in bi-acid system