Effects of Ca content on the activity of HZSM-5 nanoparticles in the conversion of methanol to olefins and coke formation

GHAEDI Mohammad; IZADBAKHSH Ali

doi:10.1016/S1872-5813(21)60130-5

Volume 49 Issue 10

Oct. 2021

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GHAEDI Mohammad, IZADBAKHSH Ali. Effects of Ca content on the activity of HZSM-5 nanoparticles in the conversion of methanol to olefins and coke formation[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1468-1486. doi: 10.1016/S1872-5813(21)60130-5

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GHAEDI Mohammad, IZADBAKHSH Ali. Effects of Ca content on the activity of HZSM-5 nanoparticles in the conversion of methanol to olefins and coke formation[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1468-1486. doi: 10.1016/S1872-5813(21)60130-5

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Effects of Ca content on the activity of HZSM-5 nanoparticles in the conversion of methanol to olefins and coke formation

doi: 10.1016/S1872-5813(21)60130-5

1.
Department of Chemical Engineering, Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr P.B. 75169-13817, Iran

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Corresponding author: E-mail: izadbakhsh@pgu.ac.ir
Received Date: 2021-03-31
Rev Recd Date: 2021-05-07

Available Online: 2021-07-19

Publish Date: 2021-10-30

Abstract

Abstract

Effects of calcium content on the performance of HZSM-5 nanoparticles of 150 nm with Si/Al ratio = 230 in the methanol to olefin conversion were investigated. The parent and modified catalysts showed their largest yields of ethylene and propylene at 490 °C and lower WHSV (= 3.3 h⁻¹). The selectivity for propylene over HZSM-5 was 0.45 at 490 °C whereas it was promoted to 0.51 over Ca27-HZSM-5 (Ca/Al = 27). With decreasing temperature from 490 to 440, and 390 °C, the yield of propylene and ethylene remained nearly constant at 0.13−0.14 and 0.10−0.11 over Ca27-HZSM-5, respectively; more narrow than the corresponding range of yields for HZSM-5 (0.10−0.14 and 0.08−0.12). FT-IR results confirmed the formation of oxygenated and poly alkyl aromatic species in the carbon deposits. TG results indicated that oxygenate coke was formed and converted to heavier poly aromatic coke species with time. Increasing Ca in the porous structure of HZSM-5 may lead to heavier aromatic carbonaceous deposits. In general, Ca content positively affected activity through modification of the density, strength, and accessibility of Brønsted and Lewis acid sites. Long-term MTO activity test of HZSM-5 with Ca/Al = 27 showed stable performance over 100 h, although with an oscillatory feature.
- ZSM-5,
- zeolite,
- MTO,
- catalyst,
- reaction,
- nano

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References(69)

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