Anchoring of Fe(III)salicylamide onto MCM-41 for Catalytic Hydroxylation of Phenol in Aqueous Medium Using Hydrogen Peroxide as Oxidant

In the oxidation of phenol by hydrogen peroxide over titanium containing MCM-41 materials, practically only para isomers are formed. The exclusive para selectivity is proposed to be due to the different strength of adsorption for the para and ortho isomers influencing the overall reaction rate or the faster polymerization of the ortho product. The former mechanism is more probable.

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Photocatalytic Hydroxylation of Phenol over Ti-Containing Zeolites (TS-1, Ti-MCM-41)

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.124-126.1793 ◽

2007 ◽

Vol 124-126 ◽

pp. 1793-1796 ◽

Cited By ~ 1

Author(s):

Gun Dae Lee ◽

Sung Gab Kim ◽

Hee Hoon Jeong ◽

Seong Soo Park ◽

Seong Soo Hong

Keyword(s):

Hydrogen Peroxide ◽

Catalytic Activity ◽

Reaction Time ◽

Product Distribution ◽

Thermal Reaction ◽

Hydroxylation Of Phenol ◽

In Situ Crystallization ◽

The Difference ◽

Mcm 41

The photo-catalytic hydroxylation of phenol with hydrogen peroxide was carried out over TS-1 and Ti-MCM-41 catalysts. For comparison, the dark (thermal)-catalytic hydroxylation of phenol was also performed. The difference in catalytic behaviors of TS-1 and Ti-MCM-41 and product distribution in both the reactions were investigated. The TS-1 and Ti-MCM-41 catalysts having the Si/Ti ratio of 50 were prepared by in-situ crystallization and characterized using XRD, UV-DRS. In the all reactions, the main products were catechol (CAT), hydroquinone (HQ) and benzoquinone (BQ). In dark (thermal)-reaction, TS-1 showed a higher catalytic activity than Ti- MCM-41. In photo-reaction, however, the activity of Ti-MCM-41 was comparable to that of TS-1. The conversion of phenol and the selectivity to CAT in the photo-catalytic reaction were higher than those in dark (thermal)-reaction. In the all reactions, the selectivity to CAT increased remarkably when the selectivities to HQ and BQ decreased with reaction time.

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Enhanced Performance of Hydrogen Peroxide Modified Pozzolan-Based Geopolymer for Abatement of Methylene Blue from Aqueous Medium

Silicon ◽

10.1007/s12633-021-01264-4 ◽

2021 ◽

Author(s):

Dzoujo T. Hermann ◽

Sylvain Tome ◽

Victor O. Shikuku ◽

Jean B. Tchuigwa ◽

Alex Spieß ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Methylene Blue ◽

Aqueous Medium

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Aqueous Medium Ullmann Reaction over a Novel Pd/Ph—Al-MCM-41 as a New Route of Clean Organic Synthesis.

ChemInform ◽

10.1002/chin.200726024 ◽

2007 ◽

Vol 38 (26) ◽

Author(s):

Hexing Li ◽

Jia Chen ◽

Ying Wan ◽

Wei Chai ◽

Fang Zhang ◽

...

Keyword(s):

Aqueous Medium ◽

Organic Synthesis ◽

Ullmann Reaction ◽

Mcm 41

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Preparation of Immobilized Chromium Schiff Base Complexes and their Catalytic Performance for Olefins Epoxidation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.692.240 ◽

2014 ◽

Vol 692 ◽

pp. 240-244

Author(s):

Gong De Wu ◽

Xiao Li Wang ◽

Zhi Li Zhai

Keyword(s):

Hydrogen Peroxide ◽

Schiff Base ◽

Elemental Analysis ◽

Catalytic Performance ◽

Schiff Base Complexes ◽

Metal Centers ◽

Chemical Measurements ◽

Physico Chemical ◽

Immobilized Complexes ◽

Mcm 41

A series of transition metal alanine-salicylaldehyde Schiff base chromium (III) complexes immobilized on MCM-41 were prepared and characterized by various physico-chemical measurements such as FIIR, XRD, HRTEM, N2 sorption and elemental analysis. The immobilized complexes were effective and stable catalysts for the epoxidation of styrene and cyclohexene with 30% hydrogen peroxide. Moreover, the metal centers were found to play important roles in the catalytic performance of immobilized complex catalysts.

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