scholarly journals Influence of the Brønsted Acidity on the Ring Opening of Decalin for Pt-USY Catalysts.

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 786
Author(s):  
Soares ◽  
Castellã Pergher
Keyword(s):  
Ring Opening ◽  
Bond Cleavage ◽  
Acid Sites ◽  
Oil Refinery ◽  
Light Cycle ◽  
Light Cycle Oil ◽  
Carbon Carbon Bond ◽  
Selective Ring Opening ◽  
Cycle Oil ◽  
Distillate Fractions

A challenging hot topic faced by the oil refinery industry is the upgrading of low-quality distillate fractions, such as light cycle oil (LCO), in order to meet current quality standards for diesel fuels. An auspicious technological alternative entails the complete saturation of the aromatic structures followed by the selective cleavage of endocyclic carbon-carbon bonds in the formed naphthenic rings (selective ring opening—SRO). This work reports the influence of Brønsted acid sites of platinum-ultra stable Y zeolite (Pt-USY) catalysts in the SRO of decalin as a model naphthenic feed. A maximum combined yield to selective ring opening products (ROP: C10-alkylcycloalkanes + OCD: C10-alkanes) as high as 28.6 wt% was achieved for 1.6Pt-NaUSY-im catalyst. The molar carbon distribution curve of the hydrocracked (C9-) products varied from M-shaped for 1.4Pt-USY-im catalyst, indicating mainly C–C bond cleavage of the ring opening products with one remaining naphthenic ring via carbocations and the paring reaction, to not M-shaped for the 1.6Pt-NaUSY-im catalyst, where carbon-carbon bond cleavage occurs preferentially through a hydrogenolysis mechanism on metal sites. High (hydro)thermal stability and secondary mesoporosity of the 1.6Pt-NaUSY-im catalysts make this system highly prospective for upgrading low-quality real distillate feeds.

scholarly journals Effect of the catalytic system and operating conditions on BTX formation using tetralin as a model molecule

2019 ◽  
Vol 9 (3-4) ◽  
pp. 185-198 ◽  
Author(s):  
Georgina C. Laredo ◽  
Patricia Pérez-Romo ◽  
Pedro M. Vega-Merino ◽  
Elva Arzate-Barbosa ◽  
Alfonso García-López ◽  
...  
Keyword(s):  
Volume Ratio ◽  
Acid Sites ◽  
Operating Conditions ◽  
Light Cycle ◽  
Light Cycle Oil ◽  
Model Molecule ◽  
Benzene Toluene ◽  
Molybdenum Catalysts ◽  
Mechanical Mixtures ◽  
Cycle Oil

Abstract Light cycle oil (LCO) is an inexpensive feedstock for the production of high-added-commercial-value-mono-aromatic compounds such as benzene, toluene and xylenes (BTX). To extend the knowledge on the processing of LCO for BTX production, the hydrocracking reaction was studied using a commercial NiMo/Al2O3 catalyst, ZSM-5 zeolite and their mechanical mixtures (20/80, 30/70 and 50/50) for processing tetralin as model feedstock in a bench-scale-trickle-bed reactor at 450–500 °C, 3.9–5.9 MPa, 1.3 1/h and H2/feed volume ratio of 168–267 m3/m3. Accessible, well-dispersed and strong Brönsted acid sites eased the hydrocracking of tetralin to BTX and the metallic hydrogenation functions from nickel–molybdenum catalysts were also required to minimize deactivation. To achieve suitable tetralin conversions (86–95 wt%), high BTX selectivity in the liquid phase (44–70 wt%) and suitable catalytic activities for coke precursor hydrogenation (to reduce deactivation), NiMo/Al2O3//ZSM-5 mixtures (50–80 ZSM-5) were employed, which probed to be effective.

Upgrading of light cycle oil via coupled hydrogenation and ring-opening over NiW/Al2O3-USY catalysts

2010 ◽  
Vol 158 (3-4) ◽  
pp. 343-347 ◽  
Author(s):  
Liang Wang ◽  
Baojian Shen ◽  
Fang Fang ◽  
Fucun Wang ◽  
Ran Tian ◽  
...  
Keyword(s):  
Ring Opening ◽  
Light Cycle ◽  
Light Cycle Oil ◽  
Cycle Oil

Selective poly-aromatics saturation and ring opening during hydroprocessing of light cycle oil over sulfided Ni-Mo/SiO2-Al2O3 catalyst

Fuel ◽  
2018 ◽  
Vol 219 ◽  
pp. 270-278 ◽  
Author(s):  
Gloria Escalona ◽  
Aditya Rai ◽  
Paulino Betancourt ◽  
Anil K. Sinha
Keyword(s):  
Ring Opening ◽  
Light Cycle ◽  
Light Cycle Oil ◽  
Cycle Oil ◽  
Al2o3 Catalyst

scholarly journals Roles of Nanostructured Bimetallic Supported on Alumina-Zeolite (AZ) in Light Cycle Oil (LCO) Upgrading

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1277
Author(s):  
Jianglong Pu ◽  
Haiping Zhang ◽  
Min Wang ◽  
Kyle Rogers ◽  
Hongmei Wang ◽  
...  
Keyword(s):  
Catalyst Support ◽  
Cetane Number ◽  
Acid Sites ◽  
Light Cycle ◽  
Model Compounds ◽  
Light Cycle Oil ◽  
Higher Temperature ◽  
Cycle Oil ◽  
Lower Temperature ◽  
Nitrogen Contents

Light cycle oil (LCO) is one of the major products in Fluid catalytic cracking (FCC) processes, and has drawbacks such as high aromatics, sulfur, and nitrogen contents, and low cetane number (CN). Hydro-upgrading is one of the most typical processes for LCO upgrading, and alumina-zeolite (AZ) is an effective hydrotreating catalyst support. This paper examined the effects of different bimetallic catalysts (CoMo/AZ, NiMo/AZ, and NiW/AZ) supported by AZ on hydro-upgrading of both model compounds and real LCO. CoMo/AZ preferred the direct desulfurization (DDS) route while the NiMo/AZ and NiW/AZ catalysts favored the desulfurization route through hydrogenation (HYD). The presence of nitrogen compounds in the feed introduced a competitive adsorption mechanism and reduced the number of available acid sites. Aromatics were partially hydrogenated into methyltetralines at first, and then further hydrogenated, cracked, and isomerized into methyldecalins, monocyclic, and methyltetralines isomers. CoMo/AZ is the best hydrodesulfurization (HDS) catalyst for the model compounds at low H2 pressure (550 psi) and for LCO at lower temperature (573 K), while NiMo/AZ performs the best for LCO at higher temperature (648 K). NiMo/AZ is the best hydrodenitrogenation (HDN) catalyst for LCO. The hydrodearomatization (HDA) performances of NiMo/AZ and NiW/AZ improved significantly and overwhelmingly higher than that of the CoMo/AZ when the H2 pressure was increased to 1100 psi.

Combined mild hydrocracking and fluid catalytic cracking process for efficient conversion of light cycle oil into high-quality gasoline

Fuel ◽  
2021 ◽  
Vol 292 ◽  
pp. 120364
Author(s):  
Peipei Miao ◽  
Xiaolin Zhu ◽  
Yangling Guo ◽  
Jie Miao ◽  
Mengyun Yu ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Fluid Catalytic Cracking ◽  
Light Cycle ◽  
High Quality ◽  
Light Cycle Oil ◽  
Efficient Conversion ◽  
Cycle Oil ◽  
Cracking Process

scholarly journals Hydro‐upgrading of light cycle oil‐synthesis of NiMo/SiO2-Al2O3-TiO2 porous catalyst

2021 ◽  
Author(s):  
Wanpeng Hu ◽  
Haiping Zhang ◽  
Min Wang ◽  
Jianglong Pu ◽  
Kyle Rogers ◽  
...  
Keyword(s):  
Light Cycle ◽  
Porous Catalyst ◽  
Light Cycle Oil ◽  
Oil Synthesis ◽  
Cycle Oil

Detailed nature of tire pyrolysis oil blended with light cycle oil and its hydroprocessed products using a NiW/HY catalyst

2021 ◽  
Vol 128 ◽  
pp. 36-44
Author(s):  
Roberto Palos ◽  
Timo Kekäläinen ◽  
Frank Duodu ◽  
Alazne Gutiérrez ◽  
José M. Arandes ◽  
...  
Keyword(s):  
Light Cycle ◽  
Pyrolysis Oil ◽  
Light Cycle Oil ◽  
Cycle Oil ◽  
Detailed Nature

Effect of space velocity on the hydrocracking of Light Cycle Oil over a Pt–Pd/HY zeolite catalyst

2012 ◽  
Vol 95 ◽  
pp. 8-15 ◽  
Author(s):  
Alazne Gutiérrez ◽  
José M. Arandes ◽  
Pedro Castaño ◽  
Martin Olazar ◽  
Astrid Barona ◽  
...  
Keyword(s):  
Zeolite Catalyst ◽  
Space Velocity ◽  
Light Cycle ◽  
Hy Zeolite ◽  
Light Cycle Oil ◽  
Cycle Oil
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