DEA/TEAOH templated synthesis and characterization of nanostructured NiAPSO-34 particles: Effect of single and mixed templates on catalyst properties and performance in the methanol to olefin reaction--颗粒学报PARTICUOLOGY

Sadeghpour, P., & Haghighi, M. (2015). DEA/TEAOH templated synthesis and characterization of nanostructured NiAPSO-34 particles: Effect of single and mixed templates on catalyst properties and performance in the methanol to olefin reaction. Particuology, 19, 69–81. https://doi.org/10.1016/j.partic.2014.04.012

DEA/TEAOH templated synthesis and characterization of nanostructured NiAPSO-34 particles: Effect of single and mixed templates on catalyst properties and performance in the methanol to olefin reaction

Parisa Sadeghpour ^{a b}, Mohammad Haghighi ^{a b *}

a Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran
b Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, Sahand New Town, Tabriz, Iran

10.1016/j.partic.2014.04.012

Volume 19, April 2015, Pages 69-81

Received 6 February 2014, Revised 23 March 2014, Accepted 3 April 2014, Available online 13 September 2014.

E-mail: haghighi@sut.ac.ir

Highlights

• Nanostructured NiAPSO-34 was hydrothermally synthesized using DEA, TEAOH and DEA/TEAOH templates.

• Ni was successfully incorporated into the SAPO-34 framework.

• The nature of templates affected the morphology of nanostructured NiAPSO-34 catalysts.

• Catalytic activity of NiAPSO-34 catalyst in MTO process was improved with the use of DEA template.

Abstract

A nanostructured NiAPSO-34 catalyst was hydrothermally synthesized and the effect of the template (diethylamine (DEA), tetraethylammonium hydroxide (TEAOH) and DEA/TEAOH) on the physicochemical properties and catalytic performance in the methanol to olefin (MTO) reaction was investigated. The samples were characterized by X-ray diffraction, field emission scanning electron microscopy (FESEM), particle size distribution analysis, energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller analysis and Fourier transform infrared spectroscopy. The X-ray diffraction patterns indicated a higher crystallinity and larger crystallite size for the catalyst synthesized using the DEA template. The FESEM results indicated that the nature of the template could affect the morphology of the nanostructured NiAPSO-34 catalyst because of its effect on the rate of crystal growth. The catalytic performance of the samples was studied in the MTO reaction at atmospheric pressure and a space velocity of 4200 cm³/(g h⁻¹) in a fixed bed reactor. The stability and activity of the NiAPSO-34 catalyst were improved using the DEA template because of its higher crystallinity, surface area and the greater extent of Ni incorporation into its framework. The possible stages of synthesis and the reaction mechanism for the MTO process over NiAPSO-34 are discussed in detail.

Graphical abstract

Keywords

NiAPSO-34; DEA; TEAOH; Methanol; Olefins; MTO

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