Sulfated zirconia was synthesized
by a one step solvent-free method, directly mixing Zr(OH)4 and (NH4)2SO4. The entire synthesis
process produces no wastewater, which is environmentally friendly.
The synthesis factor (mole ratio of (NH4)2SO4:Zr(OH)4) is the main point to test catalytic activity.
Structural properties are characterized by X-ray diffraction (XRD),
N2 adsorption–desorption isotherms, and inductively
coupled plasma (ICP). The acid property is characterized by pyridine-FTIR.
The S coverage (×10–6 mol S·m–2)–Lewis acidic sites density (mmol·m–2) relationship in sulfated zirconia reveals that the generation order
of Lewis acidic sites is from weak ones to strong ones. Calculation
of acid property reveals the positive structural–functional
relationship (WL/SL–catalytic activity).
Weak Lewis acidic sites (WL) promote the activity toward
removal olefins, while strong Lewis acidic sites (SL) speed
up the deactivation of catalysts. The superior catalytic performance
as well as environmentally friendly synthesis method demonstrates
that solvent-free sulfated zirconia has bright application prospects
in industry.
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