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KLTL-MCM-41 micro-mesoporous composite as solid base for the hydrogenation of sugars

Abstract

An approach to the synthesis of KLTL-MCM-41 micro-mesoporous composites varying molar SiO2/Al2O3 ratio (20-8) was originated by following the green technology. The synthesis was based on recycling of waste mother liquor containing preformed KLTL zeolite crystals and unutilized reagents. The micro-mesoporous composites consist of preformed KLTL zeolite crystals through hydrothermal treatment in first step. In second step, the siliceous mother liquor was transformed into the mesoporous MCM-41. The physico-chemical properties of the KLTL-MCM-41 micro-mesoporous composites were determined by PXRD, TEM-EDX, FT-IR, CO2-TPD, 27Al MAS-NMR and N2 adsorption-desorption measurements. The mesopores properties of KLTL-MCM-41 composites were depended on molar SiO2/Al2O3 ratio. The characterization results accounted the following conclusions with decreasing SiO2/Al2O3molar ratio: 1) lowering the orderliness of mesophase, 2) decreasing the wall thickness of mesopores, and 3) decreasing BET surface area and pore volume. 27Al MAS-NMR showed that only tetrahedrally coordinated aluminium encountered for zeolite KLTL. Moreover, the total amount and the strength of the basic sites of KLTL-MCM-41 micro-mesoporous composites decreased in the order: 8 MMC > 10 MMC > 15 MMC > 20 MMC. The catalytic activity of the synthesized micro-mesoporous samples were tested for the hydrogenation of xylose to xylitol as solid base.

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Publication details

The article was received on 17 Aug 2018, accepted on 03 Nov 2018 and first published on 05 Nov 2018


Article type: Paper
DOI: 10.1039/C8CY01716F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    KLTL-MCM-41 micro-mesoporous composite as solid base for the hydrogenation of sugars

    N. P. Tangale, P. S. Niphadkar, P. N. Joshi and P. L. Dhepe, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01716F

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