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The Effect of Modification on TS-1 and Gas Phase Epoxidation of Propylene

Author: LiuGuangHong
Tutor: GuoHongChen
School: Dalian University of Technology
Course: Industrial Catalysis
Keywords: TS-1 gas-phase epoxidation organic base Na2SO3 modification
CLC: O643.32
Type: Master's thesis
Year: 2011
Downloads: 79
Quote: 1
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Abstract


The effect of organic base (TMAOH, TEAOH, TPAOH and TBAOH) and salt (Na2SO3) treatment on different Titanium Silicalite-1 (TS-1) zeolite samples was researched. Gas-phase epoxidation of propylene was performed on TS-1 with the gaseous hydrogen peroxide synthesized by H2/O2 non-equilibrium plasma as oxidant. TS-1 zeolite samples before and after modification were characterized by SEM、XRD、UV-Vis、FT-IR and N2 physical adsorption technologies. Meanwhile, H2O2 decomposition abilities of TS-1 before and after TPAOH treatment were tested. The main results are as follows:1. Compared to tetramethylammonium hydroxide (TMAOH), tetraethylammonium hydroxide (TEAOH) and tetrabutylammonium hydroxide (TBAOH), the catalytic activity of nano-TS-1 after TPAOH treatment was improved. The optimum concentration of TPAOH solution was 0.07 mol/L, and the propylene conversion was increased from 4.4% to 6.4%, at the same time, propylene oxide (PO) selectivity was maintained at 94%.2. After the research of micro-TS-1 treated with TPAOH solution, it was found that the treatment was not applicable to all micro-TS-1 samples. The propylene conversion and PO selectivity was increased from 3.2% and 72.5% to 7.1% and 91.5%, respectively over the sample that was suitable for TPAOH treatment after modification with 0.07 mol/L TPAOH solution twice. The catalytic activity of samples that were not suitable for TPAOH modification after TPAOH treatment was either decreased or definitely vanished.3. The pore volume and BET surface area of catalysts had no effect on gas-phase epoxidation of propylene. The reaction activity mainly depended on H2O2 decomposition ability.4. Sodium sulfite (Na2SO3) impregnation treatment could enhance the activity of sample which was not suitable for TPAOH treatment. The optimum Na2SO3 quality and temperature of impregnation treatment was 2.8 wt.% and 50℃, respectively, and the propylene conversion and PO selectivity was 5.5% and 84%.

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