The effect of steam on maximizing light olefin production by cracking of ethanol and oleic acid over mesoporous ZSM-5 catalysts

2020 ◽  
Vol 10 (19) ◽  
pp. 6618-6627
Author(s):  
Zhixia Li ◽  
Fuwei Li ◽  
Tingting Zhao ◽  
Hongchang Yu ◽  
Shilei Ding ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Light Olefin ◽  
Olefin Production ◽  
Steam Cracking ◽  
Olefin Selectivity

Steam cracking significantly improved light olefin selectivity: mainly ethylene was obtained from ethanol and propylene from oleic acid.

scholarly journals Effect of ZSM-5 Acidity in Enhancement of Methanol-to-Olefins Process

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Hambali H. U. ◽  
Jalil A. A. ◽  
Siang T. J. ◽  
Abdulrasheed A. A. ◽  
Fatah N. A. A. ◽  
...  
Keyword(s):  
Value Added ◽  
Major Influence ◽  
Light Olefin ◽  
Production Processes ◽  
Olefin Production ◽  
Catalytic Stability ◽  
Future Direction ◽  
Olefin Selectivity ◽  
Value Added Products ◽  
Mto Process

The skyrocketing demand for olefins especially propylene, have necessitated continuous efforts in finding alternate route for olefins production. Hence, methanol to olefins (MTO) was recognized as a feasible process since methanol could simply be mass produced from any gasifiable carbon-based feedstock, such as natural gas, coal, and biomass. Essentially, obtaining a more stable catalyst would improve economy of the MTO process. Acidity of catalyst has major influence in MTO, thus it is an indispensable parameter for conversion of methanol into value-added products. The present paper discusses the reactions involved in MTO process and the effect of acidity in enhancement of light olefin selectivity and catalytic stability. The paper also captured perspectives of crucial research and future direction for catalysts development and technologies that can potentiallly boost olefin production and make it competitive with the conventional olefin production processes.

Regioselective Gas-Phase n-Butane Transfer Dehydrogenation via Silica-Supported Pincer-Iridium Complexes

2020 ◽  
Author(s):  
Boris Sheludko ◽  
Cristina Castro ◽  
Chaitanya Khalap ◽  
Thomas Emge ◽  
Alan Goldman ◽  
...  
Keyword(s):  
Gas Phase ◽  
Active Site ◽  
Lower Cost ◽  
Open Systems ◽  
Iridium Complexes ◽  
Terminal Olefin ◽  
Molecular Precursors ◽  
Sterically Demanding ◽  
Olefin Production ◽  
Steam Cracking

<b>Abstract:</b> The production of olefins via on-purpose dehydrogenation of alkanes allows for a more efficient, selective and lower cost alternative to processes such as steam cracking. Silica-supported pincer-iridium complexes of the form [(≡SiO-<sup>R4</sup>POCOP)Ir(CO)] (<sup>R4</sup>POCOP = κ<sup>3</sup>-C<sub>6</sub>H<sub>3</sub>-2,6-(OPR<sub>2</sub>)<sub>2</sub>) are effective for acceptorless alkane dehydrogenation, and have been shown stable up to 300 °C. However, while solution-phase analogues of such species have demonstrated high regioselectivity for terminal olefin production under transfer dehydrogenation conditions at or below 240 °C, in open systems at 300 °C, regioselectivity under acceptorless dehydrogenation conditions is consistently low. In this work, complexes <a>[(≡SiO-<i><sup>t</sup></i><sup>Bu4</sup>POCOP)Ir(CO)] </a>(<b>1</b>) and [(≡SiO-<i><sup>i</sup></i><sup>Pr4</sup>PCP)Ir(CO)] (<b>2</b>) were synthesized via immobilization of molecular precursors. These complexes were used for gas-phase butane transfer dehydrogenation using increasingly sterically demanding olefins, resulting in observed selectivities of up to 77%. The results indicate that the active site is conserved upon immobilization.

scholarly journals Fischer–Tropsch Synthesis for Light Olefins from Syngas: A Review of Catalyst Development

Reactions ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 227-257
Author(s):  
Arash Yahyazadeh ◽  
Ajay K. Dalai ◽  
Wenping Ma ◽  
Lifeng Zhang
Keyword(s):  
Pore Size ◽  
Crystal Size ◽  
Tropsch Synthesis ◽  
Light Olefins ◽  
Face Centered Cubic ◽  
Fischer Tropsch ◽  
Light Olefin ◽  
Structure Transition ◽  
Fischer Tropsch Synthesis ◽  
Olefin Selectivity

Light olefins as one the most important building blocks in chemical industry can be produced via Fischer–Tropsch synthesis (FTS) from syngas. FT synthesis conducted at high temperature would lead to light paraffins, carbon dioxide, methane, and C5+ longer chain hydrocarbons. The present work focuses on providing a critical review on the light olefin production using Fischer–Tropsch synthesis. The effects of metals, promoters and supports as the most influential parameters on the catalytic performance of catalysts are discussed meticulously. Fe and Co as the main active metals in FT catalysts are investigated in terms of pore size, crystal size, and crystal phase for obtaining desirable light olefin selectivity. Larger pore size of Fe-based catalysts is suggested to increase olefin selectivity via suppressing 1-olefin readsorption and secondary reactions. Iron carbide as the most probable phase of Fe-based catalysts is proposed for light olefin generation via FTS. Smaller crystal size of Co active metal leads to higher olefin selectivity. Hexagonal close-packed (HCP) structure of Co has higher FTS activity than face-centered cubic (FCC) structure. Transition from Co to Co3C is mainly proposed for formation of light olefins over Co-based catalysts. Moreover, various catalysts’ deactivation routes are reviewed. Additionally, techno-economic assessment of FTS plants in terms of different costs including capital expenditure and minimum fuel selling price are presented based on the most recent literature. Finally, the potential for global environmental impacts associated with FTS plants including atmospheric and toxicological impacts is considered via lifecycle assessment (LCA).

Composite HZSM-5 with Nanosheets for Higher Light Olefin Selectivity and Longer Lifetime in Catalytic Cracking Mixed Light Hydrocarbons

2015 ◽  
Vol 44 (12) ◽  
pp. 1697-1699 ◽  
Author(s):  
Subing Fan ◽  
Jiao Zhou ◽  
Junmin Lv ◽  
Min Liu ◽  
Hantao Huang ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Light Hydrocarbons ◽  
Light Olefin ◽  
Olefin Selectivity

CTAB-assisted size controlled synthesis of SAPO-34 and its contribution toward MTO performance

2018 ◽  
Vol 47 (29) ◽  
pp. 9861-9870 ◽  
Author(s):  
Syed ul Hasnain Bakhtiar ◽  
Xiaotong Wang ◽  
Sher Ali ◽  
Fulong Yuan ◽  
Zhibin Li ◽  
...  
Keyword(s):  
Controlled Synthesis ◽  
Pore System ◽  
Light Olefin ◽  
Diffusion Limitations ◽  
Small Pore ◽  
Methanol To Olefin ◽  
Olefin Selectivity ◽  
Size Controlled

SAPO-34 shows higher light olefin selectivity in the reaction of methanol to olefin (MTO), but its small pore system implies diffusion limitations to bigger molecular products and results in coking too.

Effect of Preparation Method of Fe–based Fischer–Tropsch Catalyst on their Light Olefin Production

2009 ◽  
Vol 130 (3-4) ◽  
pp. 630-636 ◽  
Author(s):  
Suk-Hwan Kang ◽  
Jong Wook Bae ◽  
P. S. Sai Prasad ◽  
Seon-Ju Park ◽  
Kwang-Jae Woo ◽  
...  
Keyword(s):  
Preparation Method ◽  
Fischer Tropsch ◽  
Light Olefin ◽  
Olefin Production

Comparison and assessment of zeolite catalysts performance dimethyl ether and light olefins production through methanol: a review

2019 ◽  
Vol 39 (3) ◽  
pp. 157-177 ◽  
Author(s):  
Ehsan Kianfar
Keyword(s):  
Dimethyl Ether ◽  
Raw Materials ◽  
Fixed Bed ◽  
Value Added ◽  
Zeolite Catalysts ◽  
Present Review ◽  
Light Olefins ◽  
Light Olefin ◽  
Production Methods ◽  
Olefin Production

AbstractThe present review focuses on a comparison and assessment of zeolite catalyst performance of dimethyl ether and light olefin production through methanol. Dimethyl ether is a clean fuel which needs diverse processes to be produced. Methanol to dimethyl ether is a very novel process which offers considerable advantages versus additional processes for the production of dimethyl ether. The corresponding fixed-bed reactors compose the most important section of such a process. Production of dimethyl ether by the mentioned process is of high importance since it can be catalytically transferred to a substance with the value of propylene. Furthermore, in case of capability to transfer low-purity methanol into dimethyl ether, less expensive methanol can be consequently achieved with higher value added. In the petrochemical industry, light olefins, for example, ethylene and propylene, can be used as raw materials for the production of polyolefin. The present review aims to produce dimethyl ether in order to reach olefin substances, initially conducting a compressive assessment on production methods of olefin substances.

Enhanced Light Olefin Production in Chloromethane Coupling over Mg/Ca Modified Durable HZSM-5 Catalyst

2019 ◽  
Vol 58 (13) ◽  
pp. 5131-5139 ◽  
Author(s):  
Jincan Huang ◽  
Wei Wang ◽  
Zhaoyang Fei ◽  
Qing Liu ◽  
Xian Chen ◽  
...  
Keyword(s):  
Light Olefin ◽  
Olefin Production
Sign in / Sign up

Export Citation Format

Share Document