Aromatization of C5 hydrocarbons over Ga-modified hierarchical HZSM-5 nanosheets

Wannapakdee, Wannaruedee; Suttipat, Duangkamon; Dugkhuntod, Pannida; Yutthalekha, Thittaya; Thivasasith, Anawat; Kidkhunthod, Pinit; Nokbin, Somkiat; Pengpanich, Sitthiphong; Limtrakul, Jumras; Wattanakit, Chularat

doi:10.1016/j.fuel.2018.09.093

Cited by 62 publications

(35 citation statements)

References 56 publications

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“…Isomorphous substitution refers to the incorporation of trivalent Ga into the zeolite framework without changing the framework structure [ 55 ]. Generally, the incorporation of Ga into zeolite materials can be achieved during the crystallization process, normally in the presence of a suitable template, such as TPAOH [ 46 , 55 , 56 ], TBAOH [ 57 ], TBPOH [ 58 ], etc. In the product, Ga cations take the place of Si or Al in the framework of zeolite, which are highly dispersed and stable.…”

Section: Preparation Of Ga-modified Zsm-5mentioning

confidence: 99%

Recent Advances on Gallium-Modified ZSM-5 for Conversion of Light Hydrocarbons

et al. 2021

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Light olefins are key components of modern chemical industry and are feedstocks for the production of many commodity chemicals widely used in our daily life. It would be of great economic significance to convert light alkanes, produced during the refining of crude oil or extracted during the processing of natural gas selectively to value-added products, such as light alkenes, aromatic hydrocarbons, etc., through catalytic dehydrogenation. Among various catalysts developed, Ga-modified ZSM-5-based catalysts exhibit superior catalytic performance and stability in dehydrogenation of light alkanes. In this mini review, we summarize the progress on synthesis and application of Ga-modified ZSM-5 as catalysts in dehydrogenation of light alkanes to olefins, and the dehydroaromatization to aromatics in the past two decades, as well as the discussions on in-situ formation and evolution of reactive Ga species as catalytic centers and the reaction mechanisms.

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Section: Preparation Of Ga-modified Zsm-5mentioning

confidence: 99%

Recent Advances on Gallium-Modified ZSM-5 for Conversion of Light Hydrocarbons

et al. 2021

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“…[17] Cordero-Lanzac et al found ideal conditions using kinetics and reactor modeling for the catalytic transformation of n-C5 (550°C and 3.5 g-cat h mol À 1 ) in maximizing BTX yield and selectivity (yield and selectivity of 53 %) over ZSM-5 (Si/Al 2 = 30). [18] Wannapakdee et al researched n-pentane aromatization with conversion 40 % and BTEX selectivity 45 %, using HZSM-5 nanosheets improved with Ga. [19] Experimental and density functional theory (DFT) data also confirmed the behavior of the hierarchical Ga incorporated zeolite nanosheets.…”

Section: Introductionmentioning

confidence: 97%

Light Paraffinic Naphtha to BTX Aromatics over Metal‐Modified Pt/ZSM‐5

et al. 2020

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We investigated the conversion of light paraffinic naphtha (C5-C6) into BTX (benzene, toluene, and xylenes) aromatics using 1.0 wt % Pt-M/ZSM-5 (modifier M = 1 wt% Zn, 2 wt % of Fe, La, Ga) prepared using wet-impregnation method. The effects of Pt and modifier on light naphtha conversion, yield and aromatic selectivity (benzene, toluene, xylene, C9 + aromatics) were studied in fixed-bed flow reactor in atmospheric pressure, at 550°C, and WHSV 1.0 h À 1. Catalytic efficiency of modified Pt or Pt-M ZSM-5 catalysts has been equated to conventional ZSM-5 [Si/Al 2 = 30] catalyst. While the yield of total aromatics was slightly increased over Pt/ZSM-5 comparison to parent ZSM-5 from 32 wt % to 37 wt %, the value for in situ formed mesoporous Pt-Ga/ZSM-5 was significantly improved reaching 60 wt %. The higher selectivity to aromatics is attributed to the induced mesoporous volumes and dehydrogenation activity of Ga species. These species associated with Pt were effective in the conversion of light naphtha to olefins, which later converted into aromatics by secondary reactions: cracking, isomerization and dimerization. The Pt-Ga/ZSM-5 showed good stability toward the selective production of aromatics at a low toluene/benzene ratio ∼ 0.5 due to Pt component.

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“…To confirm the acid‐base properties of all the prepared catalysts, temperature‐programmed desorption profiles of ammonia and carbon dioxide (NH 3 −TPD and CO 2 −TPD) were recorded as shown in Figures . As can be seen in Figure A, there are two obvious peaks, corresponding to weak and strong acid sites appeared at 200 and 400 °C, respectively . The total acid amount of ZSM‐5@MgAlO x (y) derived from ZSM‐5@AMO‐LDHs(y) samples decreases with respect to the pristine ZSM‐5, in particular the one obtained using the highest LDH content (ZSM‐5@MgAlO x (38)).…”

Section: Resultsmentioning

confidence: 92%

“…As can be seen in Figure 3A, there are two obvious peaks, corresponding to weak and strong acid sites appeared at 200 and 400°C, respectively. [12,60] The total acid amount of ZSM-5@MgAlO x (y) derived from ZSM-5@AMO-LDHs(y) samples decreases with respect to the pristine ZSM-5, in particular the one obtained using the highest LDH content (ZSM-5@MgAlO x (38)). This relates to the deposition of basic oxides derived from LDH coated over the acid surfaces of ZSM-5.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

et al. 2020

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Over the past decades, the catalytic cracking catalysts for hydrocarbon oil upgrading have been extensively developed to increase the yield of light olefins. In this context, we report the fabrication of the core‐shell ZSM‐5@aqueous miscible organic‐layered double hydroxides prepared by the growth of layered double hydroxides (LDH) precursors on zeolite surfaces. The deposited LDH results in a decrease of the number of strong Brønsted acid sites on zeolite surfaces and its transformation at high temperature leads to produce the highly dispersed metal oxides deposited on external surfaces of zeolites. Therefore, the acid‐base properties of designed surfaces are modified, eventually resulting in the suppression of competing hydride transfers and further side reactions. As a result, there is a significant enhancement in light olefins production compared with the pristine zeolite. In addition, the designed catalysts exhibit high recycling stability and reusability. This first example opens up the new perspectives for the development of modified acid‐base zeolites using zeolite@aqueous miscible organic‐layered double hydroxides for the catalytic upgrading of hydrocarbons.

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Aromatization of C5 hydrocarbons over Ga-modified hierarchical HZSM-5 nanosheets

Cited by 62 publications

References 56 publications

Recent Advances on Gallium-Modified ZSM-5 for Conversion of Light Hydrocarbons

Recent Advances on Gallium-Modified ZSM-5 for Conversion of Light Hydrocarbons

Light Paraffinic Naphtha to BTX Aromatics over Metal‐Modified Pt/ZSM‐5

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

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