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Magnesium aluminum oxide catalyst surface pH effects on condensation reaction of acetone

Author: YangKun
Tutor: ZhaoRuiYu；WangFangZhu
School: China University of Petroleum
Course: Chemical Engineering and Technology
Keywords: Hydrotalcite Surface acidity Characterization Activity evaluation
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 120
Quote: 0
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Abstract

Using a single drop of precipitation and kneading method were prepared with different Mg ratios LDOs and KDs series Mg oxide catalyst , using XRD, BET, EDS and FT-IR , etc. The catalysts were characterized by a variety of methods , and through the acetone vapor condensation reaction catalyst activity evaluation . Study the following conclusions: Mg ratio ( molar ratio) of 3 single drop of hydrotalcite precipitation method most complete crystalline structure , by the LDO-3 derived surface characteristics of MgO crystalline phase only diffraction peaks with maximum specific surface area, the weakest acid sites and the minimum density of acidic sites , basic sites on the surface density and the ratio of the highest density of acidic sites , micro- reactivity evaluation showed that , LDO-3 catalytic performance best conversion rate of acetone up to 36.09% , the selectivity of isophorone up to 67.34% ; kneading and physical properties of catalyst ratio variation with Mg , Mg ratio increases , the diffraction peak of the magnesium oxide crystal phase sharper , more catalyst surface area small , the surface density of acidic sites is smaller, however , KD-1.5 catalyst has the largest alkaline bit density , micro- reactivity evaluation shows , KD-1.5 catalyst best performance , the reaction activity reached 22.84% of isophorone selectivity of 50.72% ; physical and chemical properties of the catalyst surface Mg ratio and catalytic performance, compared with KD-1.5 found , LDO-3 Mg catalyst surface is relatively high, the surface density and lower strength acid sites , surface alkaline bit density and high strength, density and surface acidic sites alkaline bit density ratio is much higher than KD-1.5 catalyst reactivity, selectivity for isophorone and income were higher than KD-1.5 catalysts. By co-precipitation - mixed shape into technologies for LDO-3 to explore molding method , the results show that shaped catalyst LDO-3-10 ( containing 10% γ-Al2O3) and LDO-3 catalyst with similar catalytic properties , and has a relatively good the activity stability .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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