Effect of Surface Sulfonation on the Ordered and Textural Properties of Vanadium and Iron Containing SBA-15

Year 2017, Volume: 4 Issue: 4, 85 - 92, 27.12.2017

Suna Balcı , Sultan Yüksel

Abstract

Sulfanation of
SBA-15 by use of H₂SO₄ as the synthesis acid and post
surface sulfanation of hydrothermally synthesized V-, Fe-SBA-15 samples with
different M/Si mole ratios were carried out by use of dilute sulfuric acid. The
doubling of hydrogen ions’ amount in case H₂SO₄ usage led
to partial deterioration of the ordered structure. X-ray diffraction patterns
showed that the metal loading to SBA-15 matrix caused increases in (100) plane
reflections up to four-five times supporting the formation of longer hexagonal
arrays. The improved ordered structure of metal-SBA-15 was not destroyed by post-sulfanation.
Micro-mesoporus structure of the samples resembled type IV nitrogen isotherm
with a H4 hysteresis loop of IUPAC classification. Increase of BET surface area accompanied
with around 20% increase in micropore volume took place by metal contribution.
Increases both in Saito–Foley (SF) mean micropore and Barrett–Joyner–Halenda
(BJH) mean mesopore sizes were designated by
the increase of M/Si ratio in the synthesis solution. Around 150-200 m².g^-1
decreases in BET surface area were accompanied by the decreases in the mesopore
volume and mean mesopore dimensions, and partly increases in the micropore
volume and mean micropore diameters were observed with sulfanation.

Keywords

sulfonation, crystalline structure, pore structure, textural properties

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