Effect of the chromium precursor nature on the physicochemical and catalytic properties of Cr–ZSM-5 catalysts: Application to the ammoxidation of ethylene

Ayari, Faouzi; Mhamdi, Mourad; Debecker, Damien P.; Gaigneaux, Éric M.; Álvarez-Rodríguez, J.; Guerrero-Ruı́z, A.; Delahay, Gérard; Ghorbel, Abdelhamid

doi:10.1016/j.molcata.2011.02.012

Cited by 34 publications

(26 citation statements)

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“…The degreened sample displayed negative bands at 3584 and 3608 cm −1 , which could be assigned to the Brønsted acid sites Al-OH-Si. [34][35][36][37] The bands at 3740 cm −1 corresponded to the terminal silanols (Si-OH) vibration. 34,35,37 The band at 3652 cm −1 was less clearly assigned.…”

Section: Nh 3 Storagementioning

confidence: 99%

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Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Auvray

Grant

Lundberg

et al. 2019

Catal. Sci. Technol.

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Section: Nh 3 Storagementioning

confidence: 99%

“…[34][35][36][37] The bands at 3740 cm −1 corresponded to the terminal silanols (Si-OH) vibration. 34,35,37 The band at 3652 cm −1 was less clearly assigned. Aufdembrink et al reported the appearance of a peak at 3650 cm −1 after the activation at 550°C of an NH 4 + -exchanged chabazite zeolite.…”

Section: Nh 3 Storagementioning

confidence: 99%

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Auvray

Grant

Lundberg

et al. 2019

Catal. Sci. Technol.

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“…Possible routes for the synthesis of acetonitrile include the following: reaction between CO, NH 3 , and H 2 ; , hydrocyanation of methane with HCN, at 900 °C; , ethane or ethylene ammoxidation; catalysts for ethane ammoxidation include mixed Nb/Sb oxides, Nb-promoted Ni oxides, and Co-exchanged zeolites; because of the better yields obtained, ethane ammoxidation is the preferred route. ,− …”

Section: Introductionmentioning

confidence: 99%

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Tripodi

Bahadori

Cespi

et al. 2018

ACS Sustainable Chem. Eng.

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The growing interest for new routes to obtain acetonitrile led to the development of catalysts active toward the ammoxidation of various substrates. Among these, a C2 molecule such as ethanol represents a good choice in terms of atom economy and, being renewable, sets the basis for a long-term sustainable process. This paper describes a fully integrated, newly designed process for the production of acetonitrile from bioethanol, currently not present in the literature. The target is the production and purification of 10 kg/h of acetonitrile, unit of production used for calculations, obtained from ethanol, ammonia, and air as raw materials. All the byproducts, mainly ammonium bicarbonate and sodium cyanide, are considered marketable chemicals and represent an added value, instead of a disposal issue. Their optimized recovery is included in this flowsheet as a basis for the future economic assessment of the system. The process consumes CO 2 without its direct emission. In principle, all the carbon atoms and 90% of the nitrogen atoms are turned into reaction products, and the main loss is gaseous N 2 . The process design has been performed by means of the Aspen PLUS process simulator, on the basis of literature data and other experimental results. In addition, for an evaluation of the potential benefits of the innovative biobased route, a life cycle analysis was carried out including all the stages involved in the bioacetonitrile production (from raw materials extraction up to the gate plant). The results were then compared with those achieved for the traditional fossil route (SOHIO process), showing a sensible decrease of the environmental burdens in terms of nonrenewable resources and damage to ecosystems (e.g., toxicity, climate change, etc.). Finally, a simplified sensitivity analysis was carried out by substituting the starting raw material for the production of bioethanol (corn) with other materials conventionally used worldwide, such as sugar cane and wood. The latter option seems to make the system more competitive in terms of carbon neutrality, thanks to the usage of the residual lignocellulosic fraction available on the market.

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“…The H 2 consumption peak at 343 °C was a result of one-step reduction from Cr 6+ to Cr 3+ , accompanied by the loss of lattice oxygen atoms connected with Cr 6+ ions. 46 For the CrO x /C-450 sample, the H 2 consumption peak shifted to a low temperature, which indicated that CrO x /C-450 exhibited stronger oxidation ability and a higher amount of active lattice oxygen than Cr 2 O 3 . In addition, O 2 -TPD analysis was carried out to investigate the stability of the oxygen atoms of the catalyst; the results are shown in Fig.…”

Section: Resultsmentioning

confidence: 91%

Synthesis of CrO_x/C catalysts for low temperature NH₃-SCR with enhanced regeneration ability in the presence of SO₂

Sun

et al. 2018

RSC Adv.

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Effect of the chromium precursor nature on the physicochemical and catalytic properties of Cr–ZSM-5 catalysts: Application to the ammoxidation of ethylene

Cited by 34 publications

References 50 publications

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Synthesis of CrO_x/C catalysts for low temperature NH₃-SCR with enhanced regeneration ability in the presence of SO₂

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Effect of the chromium precursor nature on the physicochemical and catalytic properties of Cr–ZSM-5 catalysts: Application to the ammoxidation of ethylene

Cited by 34 publications

References 50 publications

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NOx trap (LNT) and selective catalytic reduction (SCR) concept

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NOx trap (LNT) and selective catalytic reduction (SCR) concept

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Synthesis of CrOx/C catalysts for low temperature NH3-SCR with enhanced regeneration ability in the presence of SO2

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Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Lean and rich aging of a Cu/SSZ-13 catalyst for combined lean NO_x trap (LNT) and selective catalytic reduction (SCR) concept

Synthesis of CrO_x/C catalysts for low temperature NH₃-SCR with enhanced regeneration ability in the presence of SO₂