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Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

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Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, KFUPM, Dhahran 31261, Saudi Arabia
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Department of Chemical Engineering, Tsinghua University Beijing 100084, China
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Center for Research, Federal University Gusau, P.M.B. 1001, Gusau, Zamfara State, Nigeria
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Center of Integrative Petroleum Research, King Fahd University of Petroleum and Minerals, KFUPM Box 5040, Dhahran 31261, Saudi Arabia
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King Abdulaziz City for Science and Technology—Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS) at King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
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Author to whom correspondence should be addressed.
Catalysts 2019, 9(11), 919; https://doi.org/10.3390/catal9110919
Received: 12 October 2019 / Revised: 22 October 2019 / Accepted: 31 October 2019 / Published: 5 November 2019
Propene is an important synthetic industrial product predominantly formed by a methanol-to-olefins (MTO) catalytic process. Propene is known to form oligomers on zeolite catalysts, and paramters to separate it from mixtures and its diffusion properties are difficult to measure. Herein, we explored the adsorption–chemisorption behavior of propene by choosing SAPO-34 zeolites with three different degrees of acidity at various adsorption temperatures in an ultra-high-vacuum adsorption system. H-SAPO-34 zeolites were prepared by a hydrothermal method, and their structural, morphological, and acidic properties were investigated by XRD, SEM, EDX, and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The XRD analysis revealed the highly crystalline structure which posses cubic morphology as confirmed by SEM images. The analysis of adsorption of propene on SAPO-34 revealed that a chemical reaction (chemisorption) was observed between zeolite and propene at room temperature (RT) when the concentration of acidic sites was high (0.158 mmol/g). The reaction was negligible when the concentration of the acidic sites was low (0.1 mmol/g) at RT. However, the propene showed no reactivity with the highly acidic SAPO-34 at low temperatures, i.e., −56 °C (using octane + dry ice), −20 °C (using NaCl + ice), and 0 °C (using ice + water). In general, low-temperature conditions were found to be helpful in inhibiting the chemisorption of propene on the highly acidic H-SAPO-34 catalysts, which can facilitate propene separation and allow for reliable monitoring of kinetic parameters. View Full-Text
Keywords: zeolites; SAPO-34; catalytic mechanism; adsorption; separation; propene; catalysts regeneration zeolites; SAPO-34; catalytic mechanism; adsorption; separation; propene; catalysts regeneration
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Usman, M.; Zhu, J.; Chuiyang, K.; Arslan, M.T.; Khan, A.; Galadima, A.; Muraza, O.; Khan, I.; Helal, A.; Al-Maythalony, B.A.; Yamani, Z.H. Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures. Catalysts 2019, 9, 919.

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