Jump to main content
Jump to site search

Issue 24, 2018
Previous Article Next Article

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

Author affiliations

Abstract

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

Graphical abstract: KLTL–MCM-41 micro–mesoporous composite as a solid base for the hydrogenation of sugars

Back to tab navigation

Supplementary files

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., 2018,8, 6429-6440
  •   Request permissions

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

    N. P. Tangale, P. S. Niphadkar, P. N. Joshi and P. L. Dhepe, Catal. Sci. Technol., 2018, 8, 6429
    DOI: 10.1039/C8CY01716F

Search articles by author

Spotlight

Advertisements