scholarly journals Effects of Acid Treatment of SAPO-34 on the Catalytic Lifetime and Light Olefin Selectivity during DTO Reaction

2015 ◽  
Vol 26 (2) ◽  
pp. 217-223 ◽  
Author(s):  
Ki-Hwan Choi ◽  
Dong-Hee Lee ◽  
Hyo-Sub Kim ◽  
Chu-Sik Park ◽  
Young-Ho Kim
Keyword(s):  
Acid Treatment ◽  
Light Olefin ◽  
Olefin Selectivity

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.

Boosting light olefin selectivity in CO2 hydrogenation by adding Co to Fe catalysts within close proximity

2020 ◽  
Author(s):  
Fei Yuan ◽  
Guanghui Zhang ◽  
Jie Zhu ◽  
Fanshu Ding ◽  
Anfeng Zhang ◽  
...  
Keyword(s):  
Co2 Hydrogenation ◽  
Light Olefin ◽  
Close Proximity ◽  
Fe Catalysts ◽  
Olefin Selectivity

Synthesis of sub-micrometric SAPO-34 by a morpholine assisted two-step hydrothermal route and its excellent MTO catalytic performance

2019 ◽  
Vol 48 (8) ◽  
pp. 2606-2616 ◽  
Author(s):  
Syed ul Hasnain Bakhtiar ◽  
Sher Ali ◽  
Xiaotong Wang ◽  
Fulong Yuan ◽  
Zhibin Li ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Crystal Size ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Hydrothermal Route ◽  
Light Olefin ◽  
Structure Directing Agent ◽  
Olefin Selectivity

SAPO-34 with a sub-micrometer crystal size was synthesized by a double hydrothermal treatment employing cost-effective morpholine as a structure directing agent, which presented an enhanced catalytic lifetime (nearly 3 times the conventional one) in the reaction of methanol to olefins with a higher light olefin selectivity (total selectivity of 97.1%).

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.

Study of coke deposition phenomena on the SAPO_34 catalyst and its effects on light olefin selectivity during the methanol to olefin reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 81965-81980 ◽  
Author(s):  
Reza Bagherian Rostami ◽  
Mohammad Ghavipour ◽  
Zuoxing Di ◽  
Yao Wang ◽  
Reza Mosayyebi Behbahani
Keyword(s):  
Hydrogen Transfer ◽  
Catalyst Deactivation ◽  
Coke Formation ◽  
Great Influence ◽  
Product Distribution ◽  
Coke Deposition ◽  
Light Olefin ◽  
Methanol To Olefin ◽  
Olefin Selectivity ◽  
Transfer Index

Hydrogen transfer index was found to be a key parameter in prediction of coke deposition behavior. A good macro-model of product distribution with coke formation is provided. Temperature had a great influence on distribution of coke species and catalyst deactivation.

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