Effect of phosphorus on HZSM-5 catalyst for C4-olefin cracking reactions to produce propylene

Zhao, Guoliang; Teng, Jiawei; Xie, Zaiku; Jin, Wenqing; Yang, Weimin; Chen, Qingling; Tang, Yi

doi:10.1016/j.jcat.2007.02.027

Cited by 237 publications

(165 citation statements)

References 22 publications

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“…This effect could be associated to formation of species containing phosphorus which would block or destroy the porous structure of zeolite. Our results confirm the findings of Gou et al (2014), Tavan et al (2014), Hodala et al (2014), Ramesh et al (2009), Blasco et al (2006), Barros et al (2007) and Zhao et al (2007). Figure 1: XRD profiles of calcined catalyst.…”

Section: Catalyst Characterizationsupporting

confidence: 92%

“…Addition of phosphorus caused a slight reduction on relative crystallinity. This decreased XRD crystallinity could be due to framework defects caused by dealumination as reported in literature (Tavan et al, 2014;Lu and Liu, 2011;Zhao et al, 2007).…”

Section: Catalyst Characterizationsupporting

confidence: 59%

“…This procedure was based on Zhao et al (2007). Water was slowly evaporated from the suspension in a rotary evaporator at 70 °C under vacuum.…”

Section: Methodsmentioning

confidence: 99%

“…To reduce the density and strength of acid sites of HZSM-5, an increase in SiO2/Al2O3 (Inaba et al, 2006;Song et al, 2010;Blasco et al, 2006), phosphorus addition (Takahashi et al, 2012;Lu and Liu, 2011;Ramesh et al, 2009;Song et al, 2010;Barros et al, 2007;Vu et al, 2010;Zhao et al, 2007) and metals impregnation (Inaba et al, 2006;Blasco et al, 2006) are current alternatives.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Propylene From Ethanol Using Phosphorus-Modified HZSM-5

Costa

Silva

2016

Braz. J. Chem. Eng.

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-Effects of phosphorus addition to HZSM-5 on ethanol conversion to propylene were evaluated. Catalysts were characterized by XRF, XRD, nitrogen adsorption, 27Al and 31 P MAS NMR, n-propylamine and ammonia TPD. Increasing P content decreased the strength and density of acid total sites. Ethanol dehydration was carried out in a fixed bed reactor operating at atmospheric pressure. Conversion was around 100% for all catalysts. 1.2 wt% of P catalyst showed the highest propylene yield, and was used to evaluate temperature and ethanol partial pressure effects on the product distribution. The highest propylene accumulated productivity was obtained for an ethanol partial pressure of 0.4 atm. Propylene formation was favored in the temperature range 475-500 °C. Significant changes in the product distribution as a function of time on stream were observed at higher temperatures, suggesting stronger catalyst deactivation. The ethylene yield decreased up to 500 °C, rising significantly at 550 °C, possibly due to heavier product cracking reactions.

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Section: Catalyst Characterizationsupporting

confidence: 92%

Section: Catalyst Characterizationsupporting

confidence: 59%

“…This procedure was based on Zhao et al (2007). Water was slowly evaporated from the suspension in a rotary evaporator at 70 °C under vacuum.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Propylene From Ethanol Using Phosphorus-Modified HZSM-5

Costa

Silva

2016

Braz. J. Chem. Eng.

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“…[6][7][8][9][10][11][12] Even though there is still some debate on the effect of acid site strength on the MTO product distribution, the promoting effect of phosphorus on the hydrothermal stability of H-ZSM-5 is undisputed. 4,9,[13][14][15][16][17][18][19][20][21][22][23][24][25] Zeolite H-ZSM-5 catalysts that contain phosphorus are more stable under hydrothermal conditions i.e. they retain more framework aluminium species and strong acid sites than their non-phosphated counterparts.…”

Section: Introductionmentioning

confidence: 99%

Local silico-aluminophosphate interfaces within phosphated H-ZSM-5 zeolites

Bij

Weckhuysen

2014

Phys. Chem. Chem. Phys.

127

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In order to elucidate phosphorus-zeolite H-ZSM-5 interactions, a variety of phosphorus-modified zeolite H-ZSM-5 materials were studied in a multi-spectroscopic manner. By deploying single pulse 27 Al, 31 P MAS NMR, 2D heteronuclear 27 Al-31 P correlation (HETCOR), 27 Al MQ MAS NMR spectroscopy, TPD of pyridine monitored by FT-IR spectroscopy, and Scanning Transmission X-ray Microscopy (STXM) the interplay and influence of acidity, thermal treatment and phosphorus on the structure and acidity of H-ZSM-5 were established. It was found that while acid treatment did not affect the zeolite structure, thermal treatment leads to the breaking of Si-OH-Al bonds, a decrease in the strong acid site number and the formation of terminal Al-OH groups. No extra-framework aluminium species was observed. Phosphorus precursors interact with the zeolitic framework through hydrogen bonds and physical coordination, as phosphorus species can be simply washed out with hot water. After phosphatation and thermal treatment two effects occur simultaneously, namely (i) phosphorus species transform into water insoluble condensed poly-phosphoric acid and (ii) phosphoric acid binds irreversibly to the terminal Al-OH groups of partially dislodged four-coordinated framework aluminium, forming local silico-aluminophosphate interfaces.These interfaces are potentially the promoters of hydrothermal stability in phosphated zeolite H-ZSM-5.

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Catalytic Cracking of Hydrocarbons to Light Olefins

Xiao

Zhao

2022

Heterogeneous Catalysis for Sustainable Energy

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Effect of phosphorus on HZSM-5 catalyst for C4-olefin cracking reactions to produce propylene

Cited by 237 publications

References 22 publications

Synthesis of Propylene From Ethanol Using Phosphorus-Modified HZSM-5

Synthesis of Propylene From Ethanol Using Phosphorus-Modified HZSM-5

Local silico-aluminophosphate interfaces within phosphated H-ZSM-5 zeolites

Catalytic Cracking of Hydrocarbons to Light Olefins

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