Activation of acetylene selective hydrogenation catalysts using oxygen containing compounds

Praserthdam, Piyasan; Phatanasri, Suphot; Meksikarin, Jumpod

doi:10.1016/s0920-5861(00)00461-2

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…[1][2][3] Therefore, the acetylene content in the feedstock has to be reduced to at least 5 ppm. It is typically obtained by thermal or catalytic cracking of higher hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

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Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Liu

Feng

et al. 2015

Catal. Sci. Technol.

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NiTi layered double hydroxide (NiTi-LDH) with rich defective sites was synthesized and used as the support for the preparation of a novel supported PdAg nanoalloys catalyst for the partial hydrogenation of acetylene. The obtained PdAg/NiTi-LDH catalyst exhibited a remarkable catalytic performance. When the conversion of acetylene reached 90%, the selectivity towards ethene maintained 82%. Superior hydrogenation activity was ascribed to two key factors. Small particle size and high dispersion of PdAg nanoparticles were responsible for boosting the catalytic activity. In addition, Ti 3+ defective sites in the support also played an important role on the enhancement of activity. The interface at the Ti 3+ species and active metals acting as new active sites enhanced the activation and dissociation of hydrogen and therefore further improved catalytic activity. Preferable selectivity was assigned to the electronic effect between NiTi-LDH support and PdAg nanoalloys. The electron transfer from the Ti 3+ species to Pd resulted in the increase of electron density and the linearly coordinated sites of Pd and therefore facilitated the desorption of ethene. Moreover, due to the reducibility of NiTi-LDH, the selectivity and stability over reduced PdAg/NiTi-LDH catalyst were further enhanced on account of the strong metal-support interaction.xM 3+ x(OH)2] x+ (A n-)x/n·mH2O. The M 2+ and M 3+ cations are uniformly dispersed within the layers. 14 Owing to the flexibility in composition

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“…[1][2][3] Therefore, the acetylene content in the feedstock has to be reduced to at least 5 ppm. It is typically obtained by thermal or catalytic cracking of higher hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

“…The trace of acetylene in the stream can poison the olefin polyethylene catalysts. [1][2][3] Therefore, the acetylene content in the feedstock has to be reduced to at least 5 ppm. Supported Pd catalyst is commercially used for this purpose but shows poor selectivity and stability.…”

Section: Introductionmentioning

confidence: 99%

Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Liu

Feng

et al. 2015

Catal. Sci. Technol.

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“…Nevertheless, the selectivity of ethane on CDS type of Pd-based catalysts is less than that of G-58B. This reveals that substantial amounts of ethane were formed via ethylene hydrogenation on support sites rather than directly from acetylene hydrogenation on palladium metal, as indicated by Praserthdam et al (2000). The selectivity of ethane of CDS type of Pd-Ag/Al 2 O 3 catalysts is superior to those of CDS type Pd/Al 2 O 3 and G-58B catalysts.…”

Section: Activity Testmentioning

confidence: 90%

“…Similar catalytic behaviors were observed on CDS type of Pd-Ag/Al 2 O 3 catalysts. This could be interpreted with the existence of little amounts of silver metal (Ag: Pd  1 in weight ratio) which may easily migrate to outer surface of catalyst but not enough to block the palladium metal (Praserthdam et al, 2000).…”

Section: Activity Testmentioning

confidence: 99%

Single‐stage Treatment in Selective Hydrogenation of Acetylene over CDS Type of Pd‐Ag/Al₂O₃ Catalyst

Chen

Wei

2004

Can J Chem Eng

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The (computer designed shape) CDS type of Pd‐Ag/Al2O3 catalyst in single‐stage reactor provides superior catalytic activity and selectivity of ethylene in comparison with those of existed two‐stage reactors packed with G‐58B catalyst under industrial operating conditions. In this research, the contents of palladium and silver of catalysts were analyzed by inductive coupling plasma (ICP). The X‐ray photoelectron spectroscopy (XPS) showed that Pd‐Ag alloy has been formed. Higher yield of ethylene may be interpreted by both geometric and electronic effect induced from silver metal. By means of Pyrolysis/GC/MS analysis of used catalysts, the components of carbonaceous deposits were found to be n‐alkenes, including n‐C8 ∼ n‐C16 or n‐C18, which may result from oligomerization of acetylene.

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“…Previous studies from our group [4][5][6][7] have shown that pretreatment with oxygen and/or oxygen-containing compounds such as O 2 , NO, N 2 O, CO, and CO 2 can improve the catalytic performance of Pd-Ag/α-Al 2 O 3 catalysts in selective acetylene hydrogenation. It is shown that the sites for direct ethane formation from acetylene could be suppressed by NO x pretreatment resulting in high ethylene selectivities.…”

Section: Introductionmentioning

confidence: 99%

Effect of N2O pretreatment on fresh and regenerated Pd-Ag/α-Al2O3 catalysts during selective hydrogenation of acetylene

Panpranot

Aungkapipattanachai

Sangvanich

et al. 2007

React Kinet Catal Lett

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Activation of acetylene selective hydrogenation catalysts using oxygen containing compounds

Cited by 21 publications

References 11 publications

Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Single‐stage Treatment in Selective Hydrogenation of Acetylene over CDS Type of Pd‐Ag/Al₂O₃ Catalyst

Effect of N2O pretreatment on fresh and regenerated Pd-Ag/α-Al2O3 catalysts during selective hydrogenation of acetylene

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Activation of acetylene selective hydrogenation catalysts using oxygen containing compounds

Cited by 21 publications

References 11 publications

Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Partial hydrogenation of acetylene over a NiTi-layered double hydroxide supported PdAg catalyst

Single‐stage Treatment in Selective Hydrogenation of Acetylene over CDS Type of Pd‐Ag/Al2O3 Catalyst

Effect of N2O pretreatment on fresh and regenerated Pd-Ag/α-Al2O3 catalysts during selective hydrogenation of acetylene

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Single‐stage Treatment in Selective Hydrogenation of Acetylene over CDS Type of Pd‐Ag/Al₂O₃ Catalyst