High Propylene Selectivity in Methanol Conversion over a Small-Pore SAPO Molecular Sieve with Ultra-Small Cage

ACS Catalysis ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3741-3749 ◽  
Author(s):  
Miao Yang ◽  
Bing Li ◽  
Mingbin Gao ◽  
Shanfan Lin ◽  
Ye Wang ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Methanol Conversion ◽  
Small Cage ◽  
Small Pore ◽  
Propylene Selectivity

Methanol-to-Olefin Conversion over Small-Pore DDR Zeolites: Tuning the Propylene Selectivity via the Olefin-Based Catalytic Cycle

ACS Catalysis ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 3009-3017 ◽  
Author(s):  
Jia Hua ◽  
Xinglong Dong ◽  
Jianjian Wang ◽  
Cailing Chen ◽  
Zhan Shi ◽  
...  
Keyword(s):  
Catalytic Cycle ◽  
Olefin Conversion ◽  
Small Pore ◽  
Methanol To Olefin ◽  
Propylene Selectivity

Formation of small pore SAPO-44 type molecular sieve

1999 ◽  
Vol 146 (1-3) ◽  
pp. 375-386 ◽  
Author(s):  
DeepakB Akolekar ◽  
SureshK Bhargava ◽  
John Gorman ◽  
Peter Paterson
Keyword(s):  
Molecular Sieve ◽  
Small Pore

Catalytic Activity of Dehydrogenation of Methanol to MF over Cu/SBA-15 and Cu-ZnO/SBA-15 Prepared by Grinding and Impregnation

2012 ◽  
Vol 608-609 ◽  
pp. 1476-1479
Author(s):  
Min Jian Huang ◽  
Gong Li ◽  
Guo Ru Li
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieve ◽  
Conversion Rate ◽  
Methyl Formate ◽  
Nitrogen Adsorption ◽  
Methanol Conversion ◽  
Reduction Temperature ◽  
Catalytic Activities ◽  
Adsorption Desorption

Using SBA-15 molecular sieve as the support, Cu/SBA-15 and Cu-ZnO/SBA-15 catalysts were prepared by grinding and impregnation. They were characterized by XRD, TEM, TPR and nitrogen adsorption/desorption methods. Their catalytic activities of the dehydrogenation of methanol to methyl formate (MF) were studied and compared.The results indicated that the Cu and ZnO in the catalysts prepared by grinding had a worse dispersity than that prepared by impregnation. However, the reduction temperature of the CuO in the catalysts prepared by grinding was obviously lower than that prepared by impregnation and the selectivity to MF can be improved with the adding of ZnO. The experiments showed that the methanol conversion rate and selectivity to MF were 15.23% and 79.81% at 270°C for Cu-ZnO/SBA-15-G prepared by grinding, respectively. For Cu-ZnO/SBA-15-I prepared by impregnation, the methanol conversion rate and selectivity to MF were 13.41 % and 81.31% respectively.

scholarly journals The guiding role of pre-coking on the coke deposition over ZSM-5 in methanol to propylene

2019 ◽  
Vol 6 (9) ◽  
pp. 190218 ◽  
Author(s):  
Lin Wang ◽  
Jing Qi ◽  
Hongqiao Jiao ◽  
Liangcheng An ◽  
Chong Guan ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermogravimetric Analysis ◽  
Methanol Conversion ◽  
Acid Sites ◽  
Coke Deposition ◽  
Steam Treatment ◽  
Elementary Analysis ◽  
Before And After ◽  
Propylene Selectivity

Deposition of carbonaceous compounds was used to improve the propylene selectivity of ZSM-5 by deactivating some acid sites meanwhile maintaining the high activity for methanol conversion. The carbonaceous species of pre-coked samples before and after MTP reactions were investigated by elementary analysis and thermogravimetric analysis (TGA). The results showed that pre-coke formed at low temperature (250°C) was unstable and easy to transform into polyaromatics species at the high reacting temperature, while combining 5% pre-coking process with 95% steam treatment at high temperature (480°C) was effective in inhibiting the formation of coke deposits and presented a significant improvement in the propylene selectivity.

Catalytic Longevity of Hierarchical SAPO-34/AlMCM-41 Nanocomposite Molecular Sieve In Methanol-to-Olefins Process

2020 ◽  
Vol 23 ◽  
Author(s):  
Hossein Roohollahi ◽  
Rouein Halladj ◽  
Sima Askari
Keyword(s):  
Molecular Sieve ◽  
Molecular Diffusion ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Acid Sites ◽  
The Other ◽  
Light Olefins ◽  
Initial Reaction ◽  
Pore Blockage ◽  
Prepared Composite

: SAPO-34/AlMCM-41, as a hierarchical nanocomposite molecular sieve was prepared by sequential hydrothermal and dry-gel methods studied for catalytic conversion of methanol to light olefins. Pure AlMCM-41, SAPO-34, and their physical mixture were also produced and catalytically compared. Physicochemical properties of materials were mainly investigated using XRD, N2 isothermal adsorptiondesorption, FESEM, FT-IR, NH3-TPD, and TG/DTG/DTA techniques. Micro-meso hierarchy of prepared composite could be demonstrated by XRD and BET analyses. Catalytic performance of materials illustrated that the methanol conversion on the prepared composite was about 98% for 120 min which showed a higher activity than the other catalysts. The initial reaction selectivity to light olefins for the composite was also comparable with those for the other catalysts. Furthermore, the results revealed that SAPO-34/AlMCM-41 preparation decreased the concentration and strength of active acid sites of the catalyst which could beneficially affect the deposition of heavy molecular products on the catalyst. However, as observed, the prepared composite was deactivated in olefins production faster than pure SAPO-34. The small mean pore diameter of composite could be mainly responsible for its pore blockage and higher deactivation rate. Meanwhile, since the SAPO-34 prepared by dry-gel method had inherently high mesoporosity, the AlMCM-41 introduction didn't promote the molecular diffusion in the composite structure. The coke content was found 15.5% for deactivated composite smaller than that for the SAPO-34 catalyst which could be due to the pore blockage and deactivation of the composite in a shorter period.

White fluorescence of polyaromatics derived from methanol conversion in Ca2+-exchanged small-pore zeolites

2021 ◽  
Author(s):  
Hongjun Park ◽  
Jae Hwan An ◽  
Jisuk Bang ◽  
Doo-Sik Ahn ◽  
Seung Hyeon Ko ◽  
...  
Keyword(s):  
Methanol Conversion ◽  
Membered Ring ◽  
Polyaromatic Hydrocarbon ◽  
Small Pore ◽  
Hydrocarbon Product

Coronene and its derivatives were synthesized using methanol inside Ca2+ ion-exchanged small-pore zeolites with an 8-membered ring window, such as LTA and RHO zeolites. The polyaromatic hydrocarbon product exhibited white...

11C-radioisotope labeled methanol conversion over H- and Cs- modified ZSM-5, Beta zeolites and MCM-41 mesoporous molecular sieve

2005 ◽  
Vol 100 (3-4) ◽  
pp. 379-383 ◽  
Author(s):  
É. Sarkadi-Pribóczki ◽  
N. Kumar ◽  
T. Salmi ◽  
D.Yu. Murzin ◽  
Z. Kovács
Keyword(s):  
Molecular Sieve ◽  
Methanol Conversion ◽  
Mesoporous Molecular Sieve ◽  
Beta Zeolites ◽  
Mcm 41
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