scholarly journals Nanocrystalline SSZ-39 zeolite as an efficient catalyst for the methanol-to-olefin (MTO) process

2016 ◽  
Vol 52 (36) ◽  
pp. 6072-6075 ◽  
Author(s):  
Nuria Martín ◽  
Zhibin Li ◽  
Joaquín Martínez-Triguero ◽  
Jihong Yu ◽  
Manuel Moliner ◽  
...  
Keyword(s):  
Efficient Catalyst ◽  
Fau Zeolite ◽  
Methanol To Olefin ◽  
High Silica ◽  
Mto Process

The synthesis of nanosized SSZ-39 zeolite has been achieved using a high silica FAU zeolite as the Si and Al source and tetraethylphosphonium (TEP) cations as OSDAs.

Effect of n-butanol cofeeding on the deactivation of methanol to olefin conversion over high-silica HZSM-5: A mechanism and kinetic study

2020 ◽  
Vol 226 ◽  
pp. 115859
Author(s):  
Xue-Gang Li ◽  
Xun Huang ◽  
Yu-Ling Zhang ◽  
Hu Li ◽  
Wen-De Xiao ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Olefin Conversion ◽  
Methanol To Olefin ◽  
High Silica

scholarly journals Conversion of Low-Grade Heat from Multiple Streams in Methanol to Olefin (MTO) Process Based on Organic Rankine Cycle (ORC)

2020 ◽  
Vol 10 (10) ◽  
pp. 3617 ◽  
Author(s):  
Danchen Wei ◽  
Cheng Liu ◽  
Zhongfeng Geng
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exergy Efficiency ◽  
Working Fluid ◽  
Low Grade ◽  
Maximum Output ◽  
Methanol To Olefin ◽  
Thermodynamic Performance ◽  
Selection Of ◽  
Mto Process

The organic rankine cycle (ORC) has been widely used to convert low-grade thermal energy to electricity. The selection of the cycle configuration, working fluid, and operating parameters is crucial for the economic profitability of the ORC system. In the methanol to olefin (MTO) process, multi-stream low-temperature waste heat has not been effectively utilized. The previous study mostly focused on the optimization of a single stream system and rarely considered the comprehensive optimization of multi-stream ORC systems which have multi-temperature heat sources. This paper proposes five kinds of system design schemes, and determines the optimal output work and the highest exergy efficiency through the selection of working fluid and optimization of system parameters. In addition, the influence of mixed working fluid on the thermodynamic performance of the system was also investigated. It is found that there is an optimal evaporation temperature due to the restriction of pinch temperature. At the optimal temperature the ORC system obtains the maximum net output power of 4.95 MW. The optimization results show that the working fluid R227EA selected from seven candidate working fluids shows the optimal thermodynamic performance in all the five design schemes, and obtains the maximum output work and exergy efficiency.

Synthesis of High-silica CHA Zeolite from FAU Zeolite in the Presence of Benzyltrimethylammonium Hydroxide

2008 ◽  
Vol 37 (9) ◽  
pp. 908-909 ◽  
Author(s):  
Masaya Itakura ◽  
Takayuki Inoue ◽  
Atsushi Takahashi ◽  
Tadahiro Fujitani ◽  
Yasunori Oumi ◽  
...  
Keyword(s):  
Fau Zeolite ◽  
High Silica

Potassium-directed sustainable synthesis of new high silica small-pore zeolite with KFI structure (ZJM-7) as an efficient catalyst for NH3-SCR reaction

2021 ◽  
Vol 281 ◽  
pp. 119480
Author(s):  
Shichao Han ◽  
Xiaomin Tang ◽  
Lijin Wang ◽  
Yanhang Ma ◽  
Wei Chen ◽  
...  
Keyword(s):  
Efficient Catalyst ◽  
Nh3 Scr ◽  
Small Pore ◽  
High Silica

scholarly journals Study on the Synthesis of Chabazite Zeolites via Interzeolite Conversion of Faujasites

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Long Van Dang ◽  
Thu Thi Minh Nguyen ◽  
Dang Van Do ◽  
Son Thanh Le ◽  
Trong Dinh Pham ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Structural Similarity ◽  
Synthetic Methods ◽  
Light Olefin ◽  
Fau Zeolite ◽  
Olefin Production ◽  
Type Zeolite ◽  
High Silica ◽  
Reduction Of Nox ◽  
Zeolite Precursors

The interzeolite conversion of faujasite (FAU-type) zeolites to chabazite (CHA-type) zeolite in the presence of N,N,N-trimethyladamantammonium and N,N,N-dimethylethylcyclohexylammonium cations was investigated over a large compositional range by carefully controlling the reaction mixture compositions. Highly crystalline CHA zeolites were also obtained by the transformation of several zeolite types including EMT, LTL, LEV, RTH, and MFI frameworks. The formation of CHA zeolite from FAU zeolite precursors was substantially faster than that from zeolite L with a similar composition. High-silica CHA zeolites were also produced successfully using a mixture of TMAda with a number of less expensive organic structure-directing agents. The CHA zeolite materials have been synthesized with high crystallinity and with a Si/Al ratio ranging from 5 to 140. Our data support the importance of structural similarity between the zeolite precursors, nucleation/crystallization processes, and the zeolite product in the interzeolite conversion compared to conventional amorphous aluminosilicate gels. Our synthetic methods could be used to prepare other 8-membered ring zeolites such as AEI and AFX frameworks, potential candidates for selective catalytic reduction of NOx, light olefin production, and CO2 abatement.

Efficient and rapid transformation of high silica CHA zeolite from FAU zeolite in the absence of water

2017 ◽  
Vol 5 (19) ◽  
pp. 9076-9080 ◽  
Author(s):  
Xin Xiong ◽  
Dingzhong Yuan ◽  
Qinming Wu ◽  
Fang Chen ◽  
Xiangju Meng ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
High Quality ◽  
Fau Zeolite ◽  
High Silica ◽  
Rapid Transformation

High quality CHA zeolite catalysts were efficiently synthesized by fast transformation of FAU zeolite in the absence of water.

Investigating the mixing sequence and the Si content in SAPO-34 synthesis for selective conversion of methanol to light olefins using morpholine &/ TEAOH templates

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17583-17594 ◽  
Author(s):  
Mohammad Ghavipour ◽  
Amin Soleimani Mehr ◽  
Yao Wang ◽  
Reza Mosayebi Behbahani ◽  
Saeed Hajimirzaee ◽  
...  
Keyword(s):  
Light Olefins ◽  
Selective Conversion ◽  
Methanol To Olefin ◽  
Gel Preparation ◽  
Si Content ◽  
Mixed Template ◽  
Mixing Sequence ◽  
Template Methods ◽  
Mto Process

SAPO-34 as the commercialized catalyst of methanol to olefin (MTO) process was synthesized by single and mixed-template methods using TEAOH and morpholine. The mixing sequence in gel preparation and the optimum Si content were investigated.

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