Effect of hydrochlorination and hydrofluorination of Pt/H-ZSM-5 and Pt–Ir/H-ZSM-5 catalysts for n-hexane hydroconversion

Aboul-Gheit, Ahmed K.; Awadallah, Ahmed E.; Aboul-Gheit, Noha A.K.; Solyman, El-Sayed A.; Abdel-Aaty, Mohammed A.

doi:10.1016/j.apcata.2007.10.017

Cited by 22 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the addition of alumina binder suppresses Lewis acid site number, and further increases the Brønsted acid site number to have moderated acidic strength on the surface [9]. Thepublications observed on protonation of Brønstedacid sites induce hydrogen ions for rebranching and isomerisation processes in high Si/Al zeolites [10][11][12][13][14][15][16][17][18]. The previous study revealed that zeolite makes the transition metal more electrophilic, thus helps the reoxidation of metal during the reaction [19].…”

Section: Parametersmentioning

confidence: 98%

“…Hydrotreated FAME in Gas Oil ( In recent decades, hydro-isomerisation of ULSD by noble metals on acidic solid catalyst like zeolites or silica aluminates in micro-or mesopore structure was used in refineries [6][7][8][9]. Zeolite synthesis with different crystalline structure and characteristics had widely studied and, its performance was investigate using hydro-isomerisation and hydrocracking on ZSM, Y-type, H-β, SAPO and MCM for branching the high molecular weight straight-chain hydrocarbons [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Product shape selectivity mainly achieved through the crystalline pore structure and molecule size in pore diffusive diameter, but the acidity of catalyst play the main role in product distribution [13][14][15].The tuning of the acidic property of zeolite and extrudate was achieved by varying SiO 2 /Al 2 O 3 (or Si/Al) and the operating temperature.…”

Section: Parametersmentioning

confidence: 99%

“…The Cl enhanced the ring saturation and suppressed the reaction path in oligomerisation [19]. Also, Cl acts as a catalytic poison if it substitutes through feed in the form of HCl [19];whereas investigating with F doping shows a low acid site number and low hydrogenation activity as compared to Cl [10,11]. Skeletal isomerisation and conversion increases if Cl ions introduced into alumina to form Brønsted acid sites [11,12].…”

Section: Parametersmentioning

confidence: 99%

“…Apart from acidity, large or medium pore size was required to avoid secondary cracking [23]. Similarly, large diameter pore zeolite can increases monobranch isomers with low hydrocracking at higher isomerisation selectivity [9][10][11][12][13][14][15].…”

Section: Parametersmentioning

confidence: 99%

See 3 more Smart Citations

Produce Low Aromatic Contents with Enhanced Cold Properties of Hydrotreated Renewable Diesel Using Pt/Alumina-Beta-Zeolite: Reaction Path Studied via Monoaromatic Model Compound

Palanisamy¹,

Gevert²,

Sankaran³

et al. 2019

Energies

View full text Add to dashboard Cite

In this present work, Hydro-dearomatisation of toluene and hydro-isomerisation of n-hexadecane (n-C 16 ) in ultralow sulphur diesel (ULSD) using Pt-Cl/H-Beta and Pt/H-Beta catalyst was investigated in a continuous down-flow trickle-bed reactor (DFTBR), and the physicochemical properties of products were studied. The catalytic effect on 40:60 wt% of H-beta-zeolite (H-β) and binder-aluminahydrochlorite extruded was characterized in scanning electron microscopy, nitrogen adsorption and coke testing. The study showed that 80 to 95 wt% of middle distillates recovered in ULSD on elevated temperature between 230 and 270 • C at 5 MPa. With a higher residence time of feed, the middle distillate recovered with 2.2 v/v% of aromatics and −32 • C of cloud point. In the model compound investigation of toluene and n-C 16 , it was observed that absorption of aromatic ring inhibits the rate of isomerisation; particularly it reduces the yield of branching and rearrangement of n-C 16 . Also, Cl-incorporated H-β extrudate enhanced the ring saturation and suppressed the reaction path in oligomerisation and cyclisation of paraffin. This methodology achieved asingle-stage upgrading technique involved in the delivery of commercial diesel in the market with low cloud point and aromatic content.Energies 2019, 12, 2853 2 of 15 without modification of cetane number of diesel [4][5][6][7][8][9]. Hydro-dearomatisation, using the trickle-bed catalytic reactor, had hydrogenation of ring and cleavescarbon-carbon cyclic compounds at moderate temperature 250 • C in the presences of excess H 2 [5][6][7][8]. Distillation temperature v/v rec. ( • C)(SIM-DIST) IBP 176 196 ASTM D86 Dist: Temp. at 10% v/v 195 216 ASTM D86 Dist: Temp. at 50% v/v 202 237 ASTM D86 Dist: Temp. at 65% v/v 231 245 ASTM D86 Dist: Temp. at 90% v/v 259 272 ASTM D86 Dist: Temp. at 95% v/v 289 384 ASTM D86 FBP 303 295 ASTM D86 Other Properties Cloud point ( • C) −32 −34 EN ISO 23015:1994 Viscosity at 40 • C (mm 2 /s) 2.083 1.909 EN ISO 3104 Density at 15 • C (kg/m 3 ) 820.6 821.2 ASTM D4052-09 Cetane Index 51.86 51 ASTM D 4737 Nitrogen content (mg/kg) <1 <1 ASTM D 4629 Sulphur content (mg/kg) <1 <1 EN ISO 8754 Author Contributions: Conceptualization, B.S.G.; Data curation, P.S.; Formal analysis, S.P.; Investigation, S.P.; Resources, B.S.G.; Supervision, K.K.; Writing-original draft, S.P.; Writing-review & editing, K.K.Funding: This research received no external funding. Conflicts of Interest:The authors declare no conflict of interest.

show abstract

Section: Parametersmentioning

confidence: 98%

Section: Parametersmentioning

confidence: 99%

Section: Parametersmentioning

confidence: 99%

Section: Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Produce Low Aromatic Contents with Enhanced Cold Properties of Hydrotreated Renewable Diesel Using Pt/Alumina-Beta-Zeolite: Reaction Path Studied via Monoaromatic Model Compound

Palanisamy¹,

Gevert²,

Sankaran³

et al. 2019

Energies

View full text Add to dashboard Cite

show abstract

“…[76] Other organic reactions (e.g. coupling reactions, hydrochlorination, hydrofluorination) Pd/Silicalite-1, [57] Pd/NaY, [77] Pt/H-ZSM-5, [78] PtIr/H-ZSM-5, [79] Pd/HY [80] ,PtPd/USY [81] , PtPd/ZSM-5. [82] deNOx…”

Section: Size Effect For Activity Enhancing:from Nanoscale To Atomic mentioning

confidence: 99%

Confinement Effects in Zeolite‐Confined Noble Metals

2019

View full text Add to dashboard Cite

Confinement of noble nanometals in a zeolite matrix is a promising way to special types of catalysts that show significant advantages in size control, site adjustment, and nano‐architecture design. The beauty of zeolite‐confined noble metals lies in their unique confinement effects on a molecular scale, and thus enables spatially confined catalysis akin to enzyme catalysis. In this Minireview, the confined synthesis strategies of zeolite‐confined noble metals will be briefly discussed, showing the processes, advantages, features, and mechanisms. The confined catalysis carried on zeolite‐confined noble metals will be summarized, and great emphasis will be paid to the confinement effects involving size, encapsulation, recognition, and synergy. Great progress of atomic sites in the size effect, supercage stabilization in the encapsulation effect, site adsorption in the recognition effect, and cascade reaction in the synergy effect are highlighted. This Minireview is concluded with challenges and opportunities in terms of the synthesis of zeolite‐confined noble metals and their applications to design multifunctional catalysts with high catalytic activity, selectivity, and stability.

show abstract

Optimal design of hierarchically structured ZSM‐5 zeolites for n‐hexane isomerization

Zhang

Liu

et al. 2021

AIChE Journal

View full text Add to dashboard Cite

Although great progress has been made in the synthesis of hierarchically structured zeolites (HSZs), the optimal design of HSZs is still very challenging due to the lack of mathematical models. This work proposes a multiscale model that is able to describe mass transfer and reaction at crystal, pellet, and reactor levels, by directly coupling model equations at two neighboring levels. Two types of HSZ particles are considered, and n-hexane isomerization catalyzed by Pt/ZSM-5 is taken as a model reaction system. The results show that the diffusion limitations in both micropores and macro-/meso-pores can significantly reduce the conversion at reactor level. The trade-off between diffusion limitations and quantity of catalytic materials determines the optimal structure of HSZ particles. The optimized HSZ particles can be 52.9-1021.4% larger in conversion than their conventional counterparts. This work provides a powerful model and some useful guidance for the design of industrial zeolite catalysts.

show abstract

Effect of hydrochlorination and hydrofluorination of Pt/H-ZSM-5 and Pt–Ir/H-ZSM-5 catalysts for n-hexane hydroconversion

Cited by 22 publications

References 20 publications

Produce Low Aromatic Contents with Enhanced Cold Properties of Hydrotreated Renewable Diesel Using Pt/Alumina-Beta-Zeolite: Reaction Path Studied via Monoaromatic Model Compound

Produce Low Aromatic Contents with Enhanced Cold Properties of Hydrotreated Renewable Diesel Using Pt/Alumina-Beta-Zeolite: Reaction Path Studied via Monoaromatic Model Compound

Confinement Effects in Zeolite‐Confined Noble Metals

Optimal design of hierarchically structured ZSM‐5 zeolites for n‐hexane isomerization

Contact Info

Product

Resources

About