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.

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Producing gasoline-like hydrocarbons by cracking crude soybean oil: tuning the NaZSM-5 zeolite’s acidity for increasing the catalyst lifetime

Brazilian Journal of Chemical Engineering ◽

10.1007/s43153-020-00067-1 ◽

2020 ◽

Vol 37 (4) ◽

pp. 691-701

Author(s):

Carlos A. Ortiz-Bravo ◽

Cassio H. Zandonai ◽

Mara Heloisa N. Olsen-Scaliante ◽

Nádia Regina Camargo Fernandes

Keyword(s):

Soybean Oil ◽

Crude Soybean Oil ◽

Catalyst Lifetime

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Precise control of density and strength of acid sites of MFI-type zeolite nanoparticles via simultaneous isomorphous substitution by Al and Fe

CrystEngComm ◽

10.1039/d0ce01031f ◽

2020 ◽

Vol 22 (44) ◽

pp. 7556-7564

Author(s):

Mizuho Yabushita ◽

Hiroki Kobayashi ◽

Atsushi Neya ◽

Masafumi Nakaya ◽

Sachiko Maki ◽

...

Keyword(s):

Acid Sites ◽

Linear Control ◽

Isomorphous Substitution ◽

Zeolite Framework ◽

Precise Control ◽

Type Zeolite ◽

Catalyst Lifetime

The co-incorporation of Al and Fe at various relative ratios into the MFI-type zeolite framework enabled linear control of the density and strength of acid sites, and such well-tuned acidity led to a better catalyst lifetime.

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Steam Reforming of Biomass Tar Model Compounds over Monolithic Catalysts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.608-609.374 ◽

2012 ◽

Vol 608-609 ◽

pp. 374-378 ◽

Cited By ~ 1

Author(s):

Lei Chen ◽

Xiao Dong Zhang ◽

Bao Feng Zhao ◽

Guang Fan Meng ◽

Hong Yu Si ◽

...

Keyword(s):

Conversion Efficiency ◽

Steam Reforming ◽

Carbon Deposition ◽

Excellent Performance ◽

Model Compounds ◽

Monolithic Catalyst ◽

Monolithic Catalysts ◽

Biomass Tar ◽

Deposition Tendency ◽

Catalyst Lifetime

Biomass tar was an inevitable by-product during biomass pyrolysis and gasification. The existence of biomass tar was a significant drawback for the use of biomass produced gases. At present, catalytic steam reforming was one of the most effective ways for tar conversion and elimination.In this paper, the coke-resistance Nickel-based monolithic catalyst and the Nickel-based monolithic catalyst were prepared, using cordierite as the catalyst carrier. Toluene and n-heptane were selected as two typical tar model compounds for the evaluation of catalyst performance in a fixed-bed reactor. The influences of temperature on the tar conversion efficiency were experimentally investigated. The results show that the two prepared monolithic catalysts have excellent performance for tar conversion. At 800°C, the conversion efficiency of toluene reach 82% and 80.4% over the coke-resistance Nickel-based monolithic catalyst and the Nickel-based monolithic catalyst, respectively. The addition of Cerium as the coke-resistance component remarkably reduces carbon deposition tendency with prolonged catalyst lifetime. monolithic catalysts have excellent performance for tar conversion. At 800°C, the conversion efficiency of toluene reached 82% and 80.4% over the coke-resistance Nickel-based monolithic catalyst and the Nickel-based monolithic catalyst, respectively. The addition of Cerium as the coke-resistance component remarkably reduces carbon deposition tendency with prolonged catalyst lifetime.

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Hierarchical MFI type zeolites with intracrystalline macropores: the effect of the macropore size on the deactivation behaviour in the MTO reaction

Catalysis Science & Technology ◽

10.1039/c9cy00368a ◽

2019 ◽

Vol 9 (12) ◽

pp. 3259-3269 ◽

Cited By ~ 13

Author(s):

Tobias Weissenberger ◽

Bastian Reiprich ◽

Albert G. F. Machoke ◽

Katharina Klühspies ◽

Jürgen Bauer ◽

...

Keyword(s):

Mto Reaction ◽

Mfi Zeolites ◽

Catalyst Lifetime

Hierarchical MFI zeolites with differently sized macropores were synthesised and a correlation between the macropore diameter and catalyst lifetime was found.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.416 ◽

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.

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