New Catalyst For N-Heptane Isomerization And Dehydrocyclization Processes Volume 5 - Issue 4

Alexandra N Protsenko, Olga G Shakirova*

• Komsomolsk-na-Amure State University, Komsomolsk-on-Amur, Russia

Received:September 07, 2021   Published:September 17, 2021

*Corresponding author:Olga G Shakirova, Komsomolsk-na-Amure State University, Komsomolsk-on-Amur, Russia

DOI: 10.32474/AOICS.2021.05.000218

Abstract PDF

New coordination compounds of copper (II) with a nitrogen-containing organic cat-ion 2,3,5-triphenyltetrazolium (2,3,5-ph₃Tz) of the composition (2,3,5-ph₃Tz)₂[CuCl₄] [1], (2,3,5-ph₃Tz)₂[CоCl4] [2], (2,3,5-ph₃Tz)₂[CuBr₄] [3], (2,3,5-ph₃Tz)₂[Cu- Br₃] [4], and their cata-lytic activity in the isomerization prosess of light gasoline fractions, have been investigated.

class="key-color">Keywords: GC-MS Analysis; Antibacterial and Antioxidant Activities

Despite the huge number of known catalysts in the oil refining industry, modern pro-duction needs new highly efficient and more environmentally acceptable catalysts, catalytic media, and solvents. Over the past few years, complexes of transition 3d-metals with nitrogen-containing cations of the composition (HL)n[MHal4] have attracted great interest in oil chemistry as new catalytic systems [1]. Tetrahalide complexes of copper (II) and cobalt (II) with 2,3,5-triphenyltetrazolium chloride of the composition (2,3,5-ph₃Tz)₂[MCl4] [2] show high catalytic activity in the joint lowtemperature process of isomerization and dehydrocyclization of n-heptane. In the present work, the complexes are formed because of the interaction of hydro-chloric acid solutions of halometalates (II) with aqueous solutions of LCl (Figure 1) according to the scheme: 2 (2,3,5-ph₃Tz +) + [M𝑋₄]2− → (2,3,5-ph₃Tz)₂[M𝑋₄] ↓.

Figure 1: Unit of 2,3,5-triphenyltetrazolium chloride, (2,3,5-ph₃Tz) Cl.

According to the X-Ray data, the presented coordination compounds have a crystal structure, in which each [CuX4]2- anion is surrounded with four organic cations. Two halogen atoms form bridging hydrogen bonds with neighboring triphenyltetrazolium cations (Figure 2). As a result of the joint low-temperature process of isomerization and dehydrocyclization of n heptane, it was found that the main reaction products are 2(3)-methylhexane, 2,3 dimethylcyclopentane, methylcyclohexane. The diagram shows the total yield of n heptane conversion products in the presence of various complexes, depending on the temperature at a reaction time of 2 hours. The maximum yield of products for the tetrachlorocuprate (II) complex is observed at 80°C, for tetrachlorocobaltate (II) is at 60° C (Figure 3). The catalytic activity of copper coordination compounds in the processes of isomerization and dehydrocyclization of n-heptane is due to the formation of an intermediate complex (2,3,5 ph₃Tz)₂[CuIBr₃] (Figure 4).

Figure 2: Crystal structure (2,3,5-ph₃Tz)₂[CuBr₄]

Figure 3: Data on the catalytic activity of compounds.

Figure 4: Crystal structure (2,3,5-ph₃Tz)₂[CuIBr₃].

1. Herbst, K, Jindrich Houzvicka, Birgitte Tofte Jespersen, John Zavilla (2005) Process of paraffin hydrocarbon isomerization and composite catalyst therefore, comprising ionic liquid and metal salt additive p. 1-12.
2. Shakirova O, Protsenko A, Protsenko A, Kuratieva N, Fowles S, et al. (2020) Syntheses, structures and properties of copper (II) and cobalt (II) complexes with 5 (3)-amino-2-chloro-3 (5)-methylpyridine isomer cations. Inorganica Chimica Acta 500: 1-9.