PHYSICO-CHEMICAL AND CATALYTIC CHARACTERISTICS OF SELECTED CATALYSTS FOR CATALYTIC AROMANING OF PROPANE
Article Sidebar
Main Article Content
Abstract
In the work, the physicochemical and catalytic characteristics of catalysts selected for catalytic aromatization of propane were studied. The conversion of propane was studied at a temperature of 450°C and a pressure of 4 atm. Liquid and gaseous process products were analyzed by gas-liquid chromatography in 40 m long SE-30 capillary columns with helium as the carrier gas. Analysis of X-ray data shows that all synthesized samples have a zeolite structure. There are no reflections in diffraction patterns that do not belong to this structural type, and there is also no strong background characteristic of amorphous mixtures. All these indicate the high phase purity of the obtained materials. In contrast to the sample, the crystalline spirit oxide phase is observed in and . It was possible to prepare a number of samples by mechanical displacement of with and establish a correlation between the reflection intensity at 2θ=36.4°С and the composition of crystals in these samples. A comparison of the initial rate of conversion of propane to aromatic hydrocarbons in spirit-containing and acidic high-silica mesoporous zeolites showed that modification with spirit leads to a significant increase in catalyst activity at the initial stages of conversion. No correlation was found between the initial velocities and the concentration of acid centers. On the contrary, a linear correlation was observed with the number of Lewis acid centers. Thus, it was shown that in the initial stages of conversion of propane to aromatic hydrocarbons, the main role is played by L-centers, which include alcohol.
Downloads
Article Details
Section
This work is licensed under a Creative Commons Attribution 4.0 International License.
Public License Terms
(For Open Journal Systems (OJS))
-
Copyright:
The copyright of the published article remains with the author(s). However, after publication, the article is distributed on the OJS platform under the Creative Commons (CC BY) license. -
License Type:
This article is distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. This means users can utilize the article under the following conditions:- Copy and distribute: The text of the article or its parts can be freely distributed.
- Quote and analyze: Parts of the article can be used for quoting and analysis.
- Free use: The article can be freely used for research and educational purposes.
- Attribution: Users must provide proper attribution and reference to the original source.
-
Commercial use:
The article can be used for commercial purposes, provided that authorship and source are properly cited. -
Document modification:
The text or content of the article can be modified or adapted, as long as it does not harm the authorship. -
Liability disclaimer:
The author(s) are responsible for the accuracy of the information contained in the article. The editorial team of the platform is not liable for any damages resulting from the use of this information. -
Public usage obligations:
The content of the article must be used only in accordance with legal and ethical standards. Unauthorized use is strictly prohibited.
Note:
These license terms are designed to ensure transparency and openness in material usage. By accepting these terms, you agree to the adaptation and distribution of the article content under the terms of the Creative Commons license.
Link: Creative Commons Attribution 4.0 International (CC BY 4.0)
How to Cite
References
1. Su, X.; Wang, G.; Bai, X.; Wu, W.; Xiao, L.; Fang, Y.; Zhang, J. synthesis of nanosized HZSM-5 zeolitesisomorphously substituted by gallium and their catalytic performance in the aromatization. Chem. Eng. J. 2016, 293, 365–375. DOI: https://doi.org/10.1016/j.cej.2016.02.088
2. Choudhary, V.R.; Sivadinarayana, C.; Kinage, A.K.; Devadas, P.; Guisnet, M. H-Gallosilicate (MFI) propane aromatization catalyst Influence of calcination temperature on acidity, activity and deactivation due to coking. Appl. Catal. A Gen. 1996, 136, 125–142. DOI: https://doi.org/10.1016/0926-860X(95)00277-4
3. Montes, A.; Giannetto, G. A new way to obtain acid or bifunctional catalysts: V. Considerations on bifunctionality of the propane aromatization reaction over [Ga,Al]-ZSM-5 catalysts. Appl. Catal. A Gen. 2000, 197, 31–39. DOI: https://doi.org/10.1016/S0926-860X(99)00530-X
4. Rodrigues, V.O.; Faro Júnior, A.C. On catalyst activation and reaction mechanisms in propane aromatization on Ga/HZSM5 catalysts. Appl. Catal. A Gen. 2012, 435, 68–77. DOI: https://doi.org/10.1016/j.apcata.2012.05.036
5. Choudhary, V.R.; Kinage, A.K.; Sivadinarayana, C.; Devadas, P.; Sansare, S.D.; Guisnet, M. H-Gallosilicate (MFI) Propane Aromatization Catalyst: Influence of Si/Ga Ratio on Acidity, Activity and Deactivation Due to Coking. J. Catal. 1996, 158, 34–50. DOI: https://doi.org/10.1006/jcat.1996.0004