scholarly journals Production ofC3+Olefins and Propylene from Ethanol by Zr-Modified H-ZSM-5 Zeolite Catalysts

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Megumu Inaba ◽  
Kazuhisa Murata ◽  
Isao Takahara ◽  
Ken-ichiro Inoue
Keyword(s):  
Carbon Deposition ◽  
Aqueous Ethanol ◽  
Zeolite Catalysts ◽  
Ethanol Conversion ◽  
Initial Yield ◽  
Zeolite Support ◽  
Propylene Yield ◽  
Zr Modification ◽  
Catalytic Deactivation

Ethanol conversion to C3+olefins, especially propylene, using Zr-modified H-ZSM-5 catalysts was investigated. Zr-modification to H-ZSM-5 zeolite could improve the initial yield of C3+olefins and propylene and could reduce the initial yield of ethylene. In general, catalysts exhibiting the higher initial yield of propylene showed the steeper decrease in propylene yield as the reaction proceeded. However, Zr-modification to H-ZSM-5 could depress the decrease in propylene yield for aqueous ethanol. As cause of catalytic deactivation, carbon deposition on catalyst and framework collapse of zeolite support can be considered. The addition of water to Zr-modified H-ZSM-5 catalyst could depress carbon deposition in some degree, and, as a result, the decrease in propylene yield could be depressed.

Study on the Cu-Ni/Y2O3-ZrO2 Catalytic Performance in Ethanol Steam Reforming

2012 ◽  
Vol 512-515 ◽  
pp. 2257-2261 ◽  
Author(s):  
Hong Da Wu ◽  
Ying Gui Jia ◽  
Yu Yin ◽  
Lue Zhao
Keyword(s):  
Steam Reforming ◽  
Conversion Rate ◽  
Carbon Deposition ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Ethanol Conversion ◽  
Ethanol Steam Reforming ◽  
Impregnation Method ◽  
Catalyst Composition ◽  
Ethanol Steam

Y2O3-ZrO2 support was prepared by two-step precipitation method with ammonia and oxalic acid. A series of Cu-Ni/Y2O3-ZrO2 catalysts were prepared by impregnation method. The catalysts were investigated and then characterized by XRD and SEM results. The activity of catalysts in ethanol steam reforming was studied. The effects of the catalyst composition on the ethanol conversion rate were discussed and the catalysts inactivation phenomenon under the temperature ranging from 673K to 723K was then analyzed. The results show that 1Cu9Ni/1Y9Zr catalyst has higher activity in ethanol steam reforming, over which ethanol conversion rate is higher than 98% under the situation of 623K, while the inactivation of catalysts with Cu/Ni>3/7 at 673K~723K was caused by carbon deposition .

Ethanol Conversion to Short-Chain Olefins Over ZSM-5 Zeolite Catalysts Enhanced with P, Fe, and Ni

2020 ◽  
Vol 63 (5-6) ◽  
pp. 414-427 ◽  
Author(s):  
Ricardo H. Gil-Horán ◽  
Juan C. Chavarría-Hernández ◽  
Patricia Quintana-Owen ◽  
Aída Gutiérrez-Alejandre
Keyword(s):  
Zeolite Catalysts ◽  
Short Chain ◽  
Ethanol Conversion

Ethanol conversion to aromatic hydrocarbons over several zeolite catalysts 

2006 ◽  
Vol 88 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Megumu Inaba ◽  
Kazuhisa Murata ◽  
Masahiro Saito ◽  
Isao Takahara
Keyword(s):  
Aromatic Hydrocarbons ◽  
Zeolite Catalysts ◽  
Ethanol Conversion

scholarly journals Resistance against Carbon Deposition via Controlling Spatial Distance of Catalytic Components in Methane Dehydroaromatization

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 148
Author(s):  
Yan Zeng ◽  
Ayano Kimura ◽  
Peipei Zhang ◽  
Jiaming Liang ◽  
Jiaqi Fan ◽  
...  
Keyword(s):  
Mechanical Milling ◽  
High Selectivity ◽  
Carbon Deposition ◽  
Zeolite Catalysts ◽  
Spatial Distance ◽  
Product Selectivity ◽  
Active Components ◽  
Methane Dehydroaromatization

Molybdenum-zeolite catalysts always suffer from severe carbon deposition and rapid deactivation in the methane dehydroaromatization (MDA) process. Herein, we present a strategy that controls spatial distance between Mo species and HMCM-22 zeolite over Mo/HMCM-22 catalysts, to inhibit the severe carbon deposition. Our characterization analyses demonstrate that the Mo/HMCM-22 catalysts possess the same active components, but the spatial distance plays a key role in determining product selectivity in the MDA process. The MDA performance reveals that Mo/HMCM-22-MM (mechanical milling) catalyst, with a medium spatial distance between Mo species and HMCM-22 zeolite, significantly inhibits carbon deposition and produces high selectivity to benzene. This work shows that spatial distance between molybdenum and zeolite is an important property for suppressing carbon deposition and improving benzene selectivity in MDA process.

scholarly journals Grand Canonical Monte Carlo Simulations of Ethanol Conversion to Propylene Over Zeolite Catalysts

2018 ◽  
Vol 5 ◽  
Author(s):  
Fangfang Wang ◽  
Wei Xia ◽  
Longxiang Wang ◽  
Junguo Wang ◽  
Xiujie Yang ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Zeolite Catalysts ◽  
Ethanol Conversion ◽  
Grand Canonical Monte Carlo ◽  
Grand Canonical

scholarly journals Acetylene hydrochlorination over boron-doped Pd/HY zeolite catalysts

RSC Advances ◽  
2019 ◽  
Vol 9 (52) ◽  
pp. 30335-30339 ◽  
Author(s):  
Lu Wang ◽  
Lizhen Lian ◽  
Haijun Yan ◽  
Feng Wang ◽  
Jide Wang ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Zeolite Catalysts ◽  
Acetylene Hydrochlorination ◽  
Hy Zeolite ◽  
Boron Doped ◽  
B Doping

B doping partly weakens carbon deposition and Pd2+ reduction, thus enhancing catalytic stabilities of Pd/HY catalysts for acetylene hydrochlorination.

Preparation of Phosphorus Modified HZSM-5 Zeolite Catalysts and their Catalytic Performances of Methanol to Olefins

2014 ◽  
Vol 875-877 ◽  
pp. 295-299
Author(s):  
Shu Xun Tian ◽  
Sheng Fu Ji ◽  
Qi Sun
Keyword(s):  
Phosphorus Content ◽  
Strong Acid ◽  
Weight Percent ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Light Olefins ◽  
Microporous Structure ◽  
Phosphorous Content ◽  
Propylene Yield ◽  
Strong Acid Sites

To improve the selectivity of light olefins, Phosphorous modified ZSM-5 zeolites catalysts with different phosphorous content were prepared by impregnation and were used in the conversion of methanol to olefins. The properties of acidity and microporous structure of the phosphorous modified ZSM-5 zeolites were investigated by XRD, N2-adsorption and desorption, and NH3-TPD. The highest propylene yield (50.82%) was observed over the H-ZSM-5 modified with the phosphorus content at 9% (weight percent). The selectivity of propylene depended strongly on the phosphorus content in the zeolites; The enhancement of propylene selectivity with increasing phosphorous content was attributed to reduction of strong acid sites on the H-ZSM-5. Modification of the ZSM-5 zeolites with phosphorous also changes the microporous structure.

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