Selective synthesis of propylene oxide through liquid-phase epoxidation of propylene with H2O2 over formed Ti-MWW catalyst

2016 ◽  
Vol 342 ◽  
pp. 173-183 ◽  
Author(s):  
Xinqing Lu ◽  
Haihong Wu ◽  
Jingang Jiang ◽  
Mingyuan He ◽  
Peng Wu
Keyword(s):  
Liquid Phase ◽  
Propylene Oxide ◽  
Selective Synthesis ◽  
Epoxidation Of Propylene ◽  
Liquid Phase Epoxidation

Direct aerobic liquid phase epoxidation of propylene catalyzed by Mn(iii) porphyrin under mild conditions: evidence for the existence of both peroxide and Mn(iv)-oxo species from in situ characterizations

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 30014-30020 ◽  
Author(s):  
Yang Li ◽  
Xiantai Zhou ◽  
Shaoyun Chen ◽  
Rongchang Luo ◽  
Jun Jiang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Selective Oxidation ◽  
Epoxidation Of Propylene ◽  
Mild Conditions ◽  
Excellent Activity ◽  
Liquid Phase Epoxidation

Manganese(iii) porphyrin exhibited excellent activity for the selective oxidation of propylene. Experimental evidences that the generation of peroxide and Mn(iv) oxo species, which was well confirmed by in situ IR, in situ UV and MS.

scholarly journals Influence of Impurities in a Methanol Solvent on the Epoxidation of Propylene with Hydrogen Peroxide over Titanium Silicalite-1

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 15 ◽  
Author(s):  
Gang Wang ◽  
Yue Li ◽  
Quanren Zhu ◽  
Gang Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Liquid Phase ◽  
Competitive Adsorption ◽  
Batch Reactor ◽  
Spectroscopic Studies ◽  
Titanium Silicalite ◽  
Trace Impurities ◽  
Epoxidation Of Propylene ◽  
Liquid Phase Epoxidation

The recycled methanol solvent of the HPPO (liquid-phase epoxidation of propylene and hydrogen peroxide to propylene oxide) process usually contains many kinds of trace impurities, such as fusel alcohol, aldehyde, ketone, ester, acetal, and amine. In this study, the influence of these impurities on the catalytic performance of titanium silicalite-1 (TS-1) in the liquid-phase epoxidation of propylene with H2O2 was investigated with a batch reactor and simulated methanol solvents. The results show that amine and acetone are the most hazardous impurities, as they could remarkably suppress the conversion of H2O2. Furthermore, competitive adsorption experiments and IR and UV-Raman spectroscopic studies indicate that the suppression effect of impurities on the catalytic activity of TS-1 can be attributed to the competitive adsorption of the impurities on the tetra-coordination framework Ti sites. With this funding, the suppression mechanism of different impurities in a methanol solvent on the catalytic activity of TS-1 in the liquid-phase epoxidation of propylene was discussed.

scholarly journals ZnAlMCM-41; a very ecofriendly and reusable solid acid catalyst for highly selective synthesis of 1, 3-dioxanes by Prins cyclization of olefins

2021 ◽  
Author(s):  
Manickam Selvaraj ◽  
Mohammed A. Assiri ◽  
Hari Singh ◽  
Jimmy Nelson Appaturi ◽  
Subrahmanyam Ch ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Selective Synthesis ◽  
Comparison Study ◽  
Catalytic Method ◽  
Prins Cyclization ◽  
Heterogeneous Catalytic

Prins cyclization of styrene (SE) with paraformaldehyde (PFCHO) was conducted with mesoporous ZnAlMCM-41 catalysts for synthesis of 4-phenyl-1,3-dioxane (4-PDO) under a liquid phase heterogeneous catalytic method. For comparison study, the...

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