Development of packed bed membrane reactor for the oxidative dehydrogenation of propane

Kotanjac, Zeljko

doi:10.3990/1.9789036529433

Cited by 4 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Light olefins, such as ethylene and propylene, are important raw materials for a number of petrochemical products including polymers and synthetic rubbers. − The conventional olefin production processes such as steam cracking, fluid catalytic cracking (FCC), and dehydrogenation (DH) suffer from important drawbacks, namely, the high energy necessities, coke formation and thermodynamic limitations. ,, …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the oxidative dehydrogenation of light paraffins is an attractive route for olefin production. It is a low temperature process that limits coke formation and extends catalyst life. , The ODH reactions are irreversible and exothermic. Thus, ODH implementation for olefin production should lead to energy savings.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, because of the limited number of ODH products, the separation cost is decreased considerably as well. , However, nowadays, ODH is still hindered by low alkane conversions and poor olefin selectivity. This prevents the ODH process from being applied in large scale processes. ,, It is felt in this respect that for industrial PODH applications to be viable, they require as a minimum, propylene selectivities comparable to the ones obtained from the Oleflex, STAR, and Catofin processes…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

Rostom

Lasa

2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

This study reports propane oxidative dehydrogenation (PODH) kinetic modeling under oxygen-free conditions employing 7.5 wt % vanadium supported on a ZrO2–γAl2O3 (1:1 wt %) catalyst designated as 7.5 V/ZrO2–γAl2O3 (1:1). This fluidizable catalyst is prepared using a wet saturation impregnation technique to achieve high VO x dispersion. Its performance is analyzed in a mini-fluidizable CREC Riser Simulator using successive propane injections, 500–550 °C, close to atmospheric pressure, and 10–20 s reaction time. Propylene selectivities obtained are up to 94% at 25% propane conversion with the catalyst lattice oxygen contributing to the PODH reaction. Using this data, a “parallel-series” model is established based on a Langmuir–Hinshelwood rate equation. Adsorption constants are defined independently with this leading to a six-independent intrinsic kinetic parameters model. These six kinetic parameters are calculated via numerical regression with reduced spans for the 95% confidence interval and low cross-correlation coefficients. On this basis, the high propylene selectivity obtained can be explained given the much larger 2.82 × 10–5 mol.gcat–1s–1 frequency factor for propylene formation versus the 1.65 × 10–6 mol.gcat–1.s–1 frequency factor for propane combustion. Calculated energies of activation (55.7 kJ/mol for propylene formation and 33.3 kJ/mol for propane combustion) appear to moderate this effect, with the influence of frequency factors prevailing. Furthermore, propylene conversion into CO x oxidation appears as a nonfavored reaction step given the 98.5 kJ/mol activation energy and 4.80 × 10–6 mol.gcat–1.s–1 frequency factor. This kinetic model is considered of special value for the further development of a scaled-up twin fluidized bed reactor configuration for PODH.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

Rostom

Lasa

2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Transition metal oxides were commonly used for the oxidation of hydrocarbons [21][22][23] . Amongst the catalysts developed, those that contained vanadia demonstrated higher activity and selectivity towards the ODHP 8,9,[24][25][26] . Moreover, supported vanadium oxides attracted much attention due to their higher performance, better thermal stability, and larger surface area 24,27,28 .…”

Section: Introductionmentioning

confidence: 99%

“…Even though dehydrogenation of propane was more selective than the established processes, its yield of propylene was strongly influenced by the process conditions, including temperature, feed, and contact time. Byproducts obviously increased the separation costs and coke formation enforcing frequent catalyst regeneration 8 . The addition of O 2 in terms of N 2 O to the reaction mixture allowed performing exothermic oxidative dehydrogenations (ODHs).…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Kazemeini

Nikkhah

Fattahi

et al. 2016

Chem.Biochem.Eng.Q.

View full text Add to dashboard Cite

Samples of V 2 O 5 catalysts supported on nanostructures of TiO 2 and γ-Al 2 O 3 were synthesized through the hydrothermal method and used for the oxidative dehydrogenation of propane (ODHP) to propylene. The TiO 2 support was utilized in both commercial microstructure and synthesized nanostructure forms. Moreover, the γ-Al 2 O 3 support was synthesized through chemical and precipitation methods. The vanadium catalyst was then deposited onto the hybrid of the TiO 2 and γ-Al 2 O 3 materials. All prepared catalysts were characterized through the BET, FESEM, FTIR, XRD and TPR techniques. Performances of the synthesized catalysts were subsequently examined in a fixed-bed reactor. The main products were propylene, ethylene and CO x . The prepared catalysts over TiO 2 and γ-Al 2 O 3 were evaluated under reactor test conditions of 500 °C, feed of C 3 H 8 /air with molar ratio of 0.6, and total feed flow rate of 90 mL min -1 . These resulted in optimum values of 35.53 and 23.88 % for the propylene selectivity and propane conversion, respectively 6 h after the start of the reaction. The comparison of performances made between the synthesized materials and those available in the open literature for the ODHP reaction was indeed satisfactory.

show abstract

Light-Alkane Oxidative Dehydrogenation to Light Olefins over Platinum-Based SAPO-34 Zeolite-Supported Catalyst

Nawaz¹,

Wei²

2012

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The experiments were conducted to study Pt–Sn/SAPO-34 catalyst utilization for oxidative dehydrogenation (ODH) of light paraffins to olefins. In recent times, the interesting concept of similar catalytic bed usage for direct dehydrogenation (PDH) and ODH has gotten attention. The light-paraffin ODH process was enhanced over the Pt–Sn-based catalyst using SAPO-34 as a support. The catalyst demonstrated promising results for propane and butane dehydrogenation, where the initial feed conversion is about 70 wt % at optimum operating conditions of 2:1 feed/oxygen ratio and 550 °C because of lower carbon monoxide and carbon dioxide (CO x ) formation. A negligible amount of coke formation and a slower deactivation rate was noticed over the proposed catalyst in comparison with the PDH reaction and other ODH processes. Propylene and butene selectivities were obtained above 96 and 90 wt %, respectively. This superior light-olefin selectivity in the ODH reaction was due to superior catalytic control of reaction by providing suitable hydrogen-abstraction platinum sites and intermediate product conversion over SAPO-34. The catalyst performance was analyzed by comparing experimental justification with characterization like X-ray fluorescence, surface area, dioxygen-pulse coke analysis, dihydrogen chemisorption, and transmission electron microscopy.

show abstract

Development of packed bed membrane reactor for the oxidative dehydrogenation of propane

Cited by 4 publications

References 0 publications

High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Light-Alkane Oxidative Dehydrogenation to Light Olefins over Platinum-Based SAPO-34 Zeolite-Supported Catalyst

Contact Info

Product

Resources

About