Behaviors of coke deposition on SAPO-34 catalyst during methanol conversion to light olefins

2007 ◽  
Vol 88 (5) ◽  
pp. 437-441 ◽  
Author(s):  
Guozhen Qi ◽  
Zaiku Xie ◽  
Weimin Yang ◽  
Siqing Zhong ◽  
Hongxing Liu ◽  
...  
Keyword(s):  
Methanol Conversion ◽  
Coke Deposition ◽  
Light Olefins

Temperature-Programmed Methanol Conversion and Coke Deposition on Fluidized-Bed Catalyst of SAPO-34

2013 ◽  
Vol 33 (2) ◽  
pp. 367-374 ◽  
Author(s):  
Cuiyu YUAN ◽  
Yingxu WEI ◽  
Jinzhe LI ◽  
Shutao XU ◽  
Jingrun CHEN ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Methanol Conversion ◽  
Coke Deposition ◽  
Temperature Programmed

scholarly journals Control of zeolite microenvironment for propene synthesis from methanol

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Longfei Lin ◽  
Mengtian Fan ◽  
Alena M. Sheveleva ◽  
Xue Han ◽  
Zhimou Tang ◽  
...  
Keyword(s):  
Active Sites ◽  
Inelastic Neutron Scattering ◽  
Sustainable Manufacturing ◽  
Methanol Conversion ◽  
Acid Sites ◽  
Light Olefins ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Catalytic Stability

AbstractOptimising the balance between propene selectivity, propene/ethene ratio and catalytic stability and unravelling the explicit mechanism on formation of the first carbon–carbon bond are challenging goals of great importance in state-of-the-art methanol-to-olefin (MTO) research. We report a strategy to finely control the nature of active sites within the pores of commercial MFI-zeolites by incorporating tantalum(V) and aluminium(III) centres into the framework. The resultant TaAlS-1 zeolite exhibits simultaneously remarkable propene selectivity (51%), propene/ethene ratio (8.3) and catalytic stability (>50 h) at full methanol conversion. In situ synchrotron X-ray powder diffraction, X-ray absorption spectroscopy and inelastic neutron scattering coupled with DFT calculations reveal that the first carbon–carbon bond is formed between an activated methanol molecule and a trimethyloxonium intermediate. The unprecedented cooperativity between tantalum(V) and Brønsted acid sites creates an optimal microenvironment for efficient conversion of methanol and thus greatly promotes the application of zeolites in the sustainable manufacturing of light olefins.

Dimethyl Ether Conversion to Olefins over the SAPO-34/ZrO2 Catalysts: Effect of the ZrO2 Supporter

2011 ◽  
Vol 347-353 ◽  
pp. 3681-3684 ◽  
Author(s):  
Young Ho Kim ◽  
Su Gyung Lee ◽  
Byoung Kwan Yoo ◽  
Han Sol Je ◽  
Chu Sik Park
Keyword(s):  
Physicochemical Properties ◽  
Dimethyl Ether ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coke Deposition ◽  
Light Olefins ◽  
Similar Activity ◽  
Dimethyl Ether Conversion ◽  
Zro2 Catalyst ◽  
Catalyst Lifetime

A SAPO-34 catalyst is well known to be one of the best catalysts for DME to olefins (DTO) reaction. Main products of the reaction were light olefins such as ethylene, propylene and butenes. However, the main problem is rapid deactivation of the SAPO-34 catalyst due to coke deposition during DTO reaction. In this study, various SAPO-34/ZrO2 catalysts added with ZrO2 were prepared for improving the lifetime and their physicochemical properties have been characterized by XRD and SEM. The DTO reaction over various SAPO-34/ZrO2 catalysts was carried out using a fixed bed reactor. All SAPO-34/ZrO2 catalysts showed similar activity and selectivity in the DTO reaction. The SAPO-34(9wt%)/ZrO2 catalyst was showed the best performance for the catalyst lifetime.

Reaction Characteristic of MeAPSO-34 (Me=Mn, Co) Catalysts for Olefins Production from Dimethyl Ether

2012 ◽  
Vol 550-553 ◽  
pp. 416-419
Author(s):  
Young Ho Kim ◽  
Su Gyung Lee ◽  
Eun Jee Kang ◽  
Hyo Sub Kim ◽  
Chu Sik Park
Keyword(s):  
Dimethyl Ether ◽  
Strong Acid ◽  
Acid Sites ◽  
Coke Deposition ◽  
Light Olefins ◽  
Co Catalysts ◽  
Strong Acid Sites ◽  
Reaction Characteristic ◽  
Catalyst Lifetime

In DME to olefins (DTO) reaction, SAPO-34 catalyst with CHA structure is well known to be one of the catalysts with good performance. However, the SAPO-34 catalyst is easily deactivated due to coke deposition during DTO reaction. In this study, MeAPSO-34 catalysts (Me=Mn, Co) were prepared for the increase of the catalyst lifetime and their properties have been characterized by XRD and SEM. The DTO reaction was carried out over the MeAPSO-34 catalysts, and the results were compared with the SAPO-34 catalyst. The lifetime of MeAPSO-34 catalysts with high DME conversion and selectivity of light olefins was prolonged than that of the SAPO-34 catalyst. It may be concluded that the decrease of strong acid sites, which were responsible for the formation of coke, affect on the lifetime of the MeAPSO-34 catalysts. In addition, the CoAPSO-34 catalyst with a Co additive showed the best performance in terms of the catalytic lifetime and the selectivity to light olefins.

Methanol Conversion to Light Olefins over SAPO-34. Sorption, Diffusion, and Catalytic Reactions

1999 ◽  
Vol 38 (11) ◽  
pp. 4241-4249 ◽  
Author(s):  
D. Chen ◽  
H. P. Rebo ◽  
K. Moljord ◽  
A. Holmen
Keyword(s):  
Methanol Conversion ◽  
Catalytic Reactions ◽  
Light Olefins

Methanol conversion on silica-aluminas. Production of light olefins

1991 ◽  
Vol 44 (1) ◽  
pp. 133-138
Author(s):  
U. A. Sedran ◽  
N. S. Fígoli
Keyword(s):  
Methanol Conversion ◽  
Light Olefins

scholarly journals Performance Enhanced SAPO-34 Catalyst for Methanol to Olefins: Template Synthesis Using a CO2-Based Polyurea

Catalysts ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 16 ◽  
Author(s):  
Yuehong Yu ◽  
Jiaxiang Qin ◽  
Min Xiao ◽  
Shuanjin Wang ◽  
Dongmei Han ◽  
...  
Keyword(s):  
Molecular Sieves ◽  
Catalytic Performance ◽  
Coke Deposition ◽  
Light Olefins ◽  
Bet Surface Area ◽  
Intrinsic Diffusion ◽  
Hydrothermal Conditions ◽  
Mto Reaction ◽  
And Control ◽  
Heterogeneous Size

Introducing mesopores into the channels and cages of conventional micropores CHA (Chabazite) topological structure SAPO-34 molecular sieves can effectively improve mass transport, retard coke deposition rate and enhance the catalytic performance for methanol to olefins (MTO) reaction, especially lifetime and olefins selectivity. In order to overcome the intrinsic diffusion limitation, a novel CO2-based polyurea copolymer with affluent amine group, ether segment and carbonyl group has been firstly applied to the synthesis of SAPO-34 zeolite under hydrothermal conditions. The as-synthesized micro-mesoporosity SAPO-34 molecular sieve catalysts show heterogeneous size distribution mesopores and exhibit slightly decrease of BET surface area due to the formation of defects and voids. Meanwhile, the catalysts exhibit superior catalytic performance in the MTO reaction with more than twice prolonged catalytic lifespan and improvement of selectivity for light olefins compared with conventional microporous SAPO-34. The methodology provides a new way to synthesize and control the structure of SAPO-34 catalysts.

CFD modeling of methanol to light olefins process in a sodalite membrane reactor on SAPO-34 catalyst with in situ steam removal

2020 ◽  
Vol 23 ◽  
Author(s):  
Abbas Aghaeinejad-Meybodi ◽  
Seyed Mahdi Mousavi ◽  
Ali Asghar Shahabi ◽  
Mohammad Rostampour Kakroudi
Keyword(s):  
Membrane Reactor ◽  
Fixed Bed ◽  
Methanol Conversion ◽  
Fixed Bed Reactor ◽  
Light Olefins ◽  
Cfd Modeling ◽  
Cfd Model ◽  
Ethylene Propylene ◽  
Mto Process

Aims and Objective: In this work, the performance of sodalite membrane reactor (MR) in methanol to olefins (MTO) process was evaluated for ethylene and propylene production with in situ steam removal using 3-dimensional CFD (computational fluid dynamic) technique. Methods: The local information of component concentration for methanol, ethylene, propylene, and water was obtained by the proposed CFD model. Literature data were applied to validate model results, and between experimental data and predicted results using CFD model, a good agreement was attained. In the sodalite MR model, a commercial SAPO-34 catalyst in the reaction zone was selected. The influence of key operation parameters including pressure and temperature on methanol con-version, water recovery, and yields of ethylene, propylene, and water was studied to evaluate the performance of sodalite MR. Permeation flux through the sodalite membrane was increased by an increase of reaction temperature which led to enhance-ment of water stream recovered in the permeate side. Result and Conclusion: The CFD modeling results showed that the sodalite MR in MTO process has higher performance regarding methanol conversion compared to the fixed-bed reactor (methanol conversion of 97% and 89% at 733 K for sodalite MR and fixed-bed reactor, respectively).

Effect of zinc introduction on catalytic performance of ZSM-5 in conversion of methanol to light olefins

2014 ◽  
Vol 68 (9) ◽  
Author(s):  
Su-Hong Zhang ◽  
Zhi-Xian Gao ◽  
Shao-Jun Qing ◽  
Sheng-Yu Liu ◽  
Yan Qiao
Keyword(s):  
Methanol Conversion ◽  
Catalytic Performance ◽  
Light Olefins ◽  
Acidic Property ◽  
X Ray Diffraction ◽  
Light Olefin ◽  
X Ray ◽  
Olefin Conversion ◽  
Methanol To Olefin ◽  
Temperature Programmed

AbstractThe effect of Zn on the catalytic performance of ZSM-5 in the methanol-to-olefin conversion was investigated. The samples were characterised by X-ray diffraction, N2 adsorption, FTIR, temperature-programmed desorption of ammonia and water, and Py-IR. The experimental results revealed Znmodified ZSM-5 to show a lower selectivity to light olefin at the higher reaction temperature of 520°C but a higher selectivity to light olefin at lower temperatures. As a comparison, the catalytic performance of Ca-modified ZSM-5 for the methanol conversion is also given. From the above results, it is concluded that Zn may play another role in the methanol conversion in addition to tuning the surface acidic property after modification.

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