Synthesis of Solid Acid Catalysts Based on TiO₂- SO₄^2-and Pt/TiO₂- SO₄^2- Applied in n-Hexane Isomerization

Juan Manuel Hernández Enríquez, Luz Aracely Cortez Lajas, Ricardo García Alamilla, Estefanía Ángeles San Martín, Pedro García Alamilla, Edward Brent Handy, Guadalupe Cárdenas Galindo, Luz Arcelia García Serrano

CIEP, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava #6, Zona Universitaria, 78210 San Luis Potosí, San Luis Potosí, México.
Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo 30 de Junio #1520, Barrio La Laguna Ticomán, 07340 México D.F., México.
Instituto Tecnológico de Cd. Madero, División de Estudios de Posgrado e Investigación, Juventino Rosas y Jesús Urueta S/N, Col. Los Mangos, 89440 Cd. Madero, Tamaulipas, México.
Universidad Juárez Autónoma de Tabasco, División Académica de Ciencias Agropecuarias, Avenida Universidad S/N, Zona Cultura, Colonia Magisterial, 86040 Villahermosa Tabasco, México.

DOI: 10.4236/ojmetal.2013.33006                

Abstract

The physicochemical properties and catalytic activity of pure and sulfated titanium oxide (TiO₂ and ) is described in this work. Titanium hydroxide synthesized by the sol-gel method was impregnated with a 1 N H₂SO₄ solution, varying amount of sulfate ions () in the range from 10 to 20 wt%. Pure and modified hydroxides were calcined at 500°C for 3 h and then characterized by TGA-DTG, XRD, BET, FT-IR, potentiometric titration with n-butylamine and 2-propanol dehydration. Catalytic activity of materials was tested in the n-hexane isomerization at 350°C. The results showed that TiO₂ and mainly developed anatase phase. All have acceptable specific surface area (95-105 m²/g). Potentiometric titration with n-butylamine revealed that showed higher acidity (430-530 mV) than compared to pure TiO₂ (﹣15 mV), indicating that this oxide only has weak acidity. The results showed good relationship between acidity determined by potentiometric titration with n-butylamine and the catalytic activity evaluated by 2-propanol dehydration and n-hexane isomerization. Titanium oxide with 20 wt% ofions was the material that demonstrated the highest catalytic activity for both reactions.

Keywords

Acid Catalysts; Sulfated Titanium Oxide; Physico-Chemical Properties; n-Hexane Isomerization

Conflicts of Interest

The authors declare no conflicts of interest.

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