Comparative studies of ethanol to propylene over HZSM-5/SAPO-34 catalysts prepared by hydrothermal synthesis and physical mixture

Duan, Chao; Zhou, Rui; Hua, Yuan; Zhang, Li; Chen, Jie

doi:10.1016/j.fuproc.2012.03.015

Cited by 58 publications

(29 citation statements)

References 14 publications

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“…However, the increase in ethylene yield at 550 °C is due to the secondary cracking reactions, which are favored at higher temperatures, where the long chain compounds are able to form lighter ones. This behavior was also observed by Duan et al (2012). Figure 10 shows the profiles of the cumulative amount of propylene (CAP) formed as a function of cumulative amount of fed ethanol (CAFE) for 1.2PHZSM-5 with different ethanol partial pressures in the range of 450 to 550 °C.…”

Section: Catalytic Testssupporting

confidence: 66%

“…03, pp. 503 -513, July -September, 2016 pylene yield as suggested by Schulz and Bandermann (1994), Inaba et al (2006), Song et al (2010) and Duan et al (2012).…”

Section: Methodsmentioning

confidence: 92%

“…Therefore, the production of propylene from ethanol has attracted considerable attention. The use of zeolites in catalytic conversion of ethanol has been reported by several authors, in particular the use of HZSM-5 for this kind of reaction (Takahashi et al, 2012;Inaba et al, 2006;Lu and Liu, 2011;Barros et al, 2007;Duan et al, 2012;Vu et al, 2010;Song et al, 2010;Ramesh et al, 2009).…”

Section: Introductionmentioning

confidence: 96%

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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: Catalytic Testssupporting

confidence: 66%

“…03, pp. 503 -513, July -September, 2016 pylene yield as suggested by Schulz and Bandermann (1994), Inaba et al (2006), Song et al (2010) and Duan et al (2012).…”

Section: Methodsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 96%

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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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“…Therefore, the composite catalyst had excellent performance in heavy oil cracking process and olefins yield. Also, Duan et al synthesized HZSM‐5/SAPO‐34 composite catalysts with various HZSM‐5/SAPO‐34 ratios and applied them in ethanol to propylene reaction. They concluded that propylene yield and catalytic stability strongly depend on the concentration and strength of acid sites.…”

Section: Introductionmentioning

confidence: 99%

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Mohammadkhani

Haghighi

Aghaei

2018

Asia-Pacific J Chem Eng

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Nanostructured core‐shell silicoaluminophosphate (SAPO)‐34/zeolite socony mobil (ZSM)‐5 composite has been synthesized with various SAPO‐34 loadings in order to control light olefins selectivity and increase its lifetime in methanol to olefins process. Physicochemical properties and catalytic performance of SAPO‐34/ZSM‐5 composite catalyst were different, compared with the parent SAPO‐34 and ZSM‐5. As‐synthesized samples were characterized by different methods such as X‐Ray diffraction, field emission scanning electron microscopy, Brunauer–Emmett–Teller, energy‐dispersive X‐ray, Fourier transform infrared spectroscopy, and NH3‐temperature‐programmed desorption techniques. By increasing SAPO‐34 content in composite catalysts, relative crystallinity of CHA‐phase (chabazite) was enhanced, whereas it was decreased for MFI‐phase. Also, surface area improved by increasing SAPO‐34 loading in core‐shell composite catalysts. The results of the activity test showed that lifetime remarkably increased by using composite catalysts. Compared with the parent SAPO‐34 and ZSM‐5, the composite catalyst with 80% SAPO‐34 loading showed higher methanol conversion and olefins selectivity with time on stream. This is due to the synergic effect between SAPO‐34 and ZSM‐5 zeolites in composite catalyst.

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“…The catalysts based on Clinoptilolite have been studied in methanol conversion [29], propane dehydrogenation process [30], direct synthesis of dimethyl ether [5], catalyst for the selective catalytic reduction of NOx by ammonia (NH 3 -SCR) [31] and adsorbents [32][33][34][35]. Moreover, the nanocomposites based on SAPO-34 have been studied in propane dehydrogenation process (ZSM-5/SAPO-34 and SAPO-34/ZSM-5) [36], dimethyl ether conversion to light olefins (SAPO-34/ZrO 2 ) [14], ethanol conversion to propylene (HZSM-5/SAPO-34) [37,38], and methanol conversion to olefins (ZSM-5/SAPO-34) [9].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted hydrothermal synthesis and catalytic behavior of a novel SAPO-34/Clinoptilolite nanocomposite catalyst for high propylene demand in MTO process

Moradiyan

Halladj

Askari

et al. 2017

Journal of Physics and Chemistry of Solids

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SAPO-34 as a catalyst has high selectivity and hydrothermal stability, but it is rapidly deactivated by the formation of coke in its micropores. Evaluating the natural Clinoptilolite capability as a binder in nanocomposite catalysts is of interest because of its low cost, and accelerating the reaction. The SAPO-34/Clinoptilolite (S/C) nanocomposite catalysts were synthesized via ultrasonic-assisted hydrothermal method using Clinoptilolite as a binder. Subsequent performance of the catalyst was investigated in the methanol to olefins (MTO) reaction. The structures of synthesized nanocomposite were characterized with several methods such as XRD, XRF, FESEM, TEM, NH 3-TPD, FT-IR, and nitrogen adsorption techniques. The modified Clinoptilolite was attained using nitric acid treatment. Although the physicochemical analysis indicated that HNO 3-treatment decreases the crystallinity of the Clinoptilolite, the specific surface area of natural zeolite enhances considerably from 20.07 to 187.8 m 2 /g. The nanocomposite catalysts showed high selectivity toward light olefins with 100% conversion and 90% selectivity to light olefins as desired products at 450˚C. Nanocomposite with the additional diffusion paths for mass transfer provided by binder-filled space ascend to higher catalytic lifetimes in compare with free SAPO-34 catalyst.

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Comparative studies of ethanol to propylene over HZSM-5/SAPO-34 catalysts prepared by hydrothermal synthesis and physical mixture

Cited by 58 publications

References 14 publications

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

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

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

Ultrasonic-assisted hydrothermal synthesis and catalytic behavior of a novel SAPO-34/Clinoptilolite nanocomposite catalyst for high propylene demand in MTO process

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