Comparison of surface acidity/basicity of natural and modified aluminosilicates by conversion of 2-methylbut-3-yn-2-ol

Lyudmila A. Novikova; Nataliia A. Khodosova; Frank Roessner; Olga Yu. Strelnikova; Larisa I. Belchinskaya

Lyudmila A. Novikova associate professor, Department of Chemistry, FSBEI HPE “Voronezh state academy of forestry and technologies”, Voronezh, E-mail: yonk@mail.ru
Nataliia A. Khodosova associate professor, Department of Chemistry, FSBEI HPO “Voronezh state academy of forestry and technologies”, Voronezh
Frank Roessner professor, chair of the Industrial Chemistry Department, Carl von Ossietzky University of Oldenburg, Germany
Olga Yu. Strelnikova associate professor, Department of Chemistry, FSBEI HPE “Voronezh state academy of forestry and technologies”, Voronezh
Larisa I. Belchinskaya professor, Department of Chemistry, FSBEI HPE “Voronezh state academy of forestry and technologies”, Voronezh

Keywords: catalytic test reaction, natural alumosilicates, acid and alkaline treatment, basic and acidic sites.

Abstract

Surface acidity/basicity of natural and acid/alkali activated aluminosilicates of layered (nontronite,
Nt, glauconite, Gla), framework (clinoptilolite, C95) and a mixed layered type (M45C20) structure were studied
by means of catalytic conversion of 2-methylbut-3-yn-2-ol. Conversion over natural samples decreases in the
order C95 > M45C20 ≈ Nt > Gla. Acidic active sites are dominant on the surface of both natural and acid
treated samples. Acid activation strongly reduced the catalytic activity of zeolite C95 while in case of M45C20
and Nt the conversion slightly increased. The yield of products formed on acid sites decreased by 62% for
C95 and increased by 25; 30 and 100%, respectively for M45C20, Nt and Gla. Catalytic activity of all studied
minerals was significantly suppressed after alkaline activation except for M45C20 for which the increasing
activity of basic sites was observed. The changes in conversion and surface acidity of minerals were
explained by the changes in a ratio of acidic and basic sites induced by surface modification.

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