Tailoring New Adsorbents Based on π-Complexation: Cation and Substrate Effects on Selective Acetylene Adsorption

Joel Padin; Ralph T. Yang

doi:10.1021/ie970207+

Tailoring New Adsorbents Based on π-Complexation: Cation and Substrate Effects on Selective Acetylene Adsorption

Joel Padin
, Ralph T. Yang

Department of Chemical and Biological Engineering

University of Michigan, Ann Arbor

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

Sorbents were prepared by dispersing various metal cations, M²⁺ (Fe²⁺, Co²⁺, Ni²⁺), by thermal monolayer dispersion of MCl₂ on various high surface area substrates (γ-Al₂O₃, SiO₂, MCM-41 mesoporous zeolite). All sorbents showed reversible and highly selective adsorption for acetylene (C₂H₂) over other hydrocarbons. This was due to the formation of π-complexation bonds between the M²⁺ cations and C₂H₂. The following trend was observed for all substrates studied: Fe²⁺ > Co²⁺ > Ni²⁺. Substrates played an important role in acetylene adsorption, with SiO₂-based sorbents outperforming those based on Al₂O₃. For example, the ratio of C₂H₂/M²⁺ for FeCl₂/ SiO₂ was 1.35, while for FeCl₂/Al₂O₃ the ratio was 0.9. This result is due to the fact that SiO₂ has less surface oxygen vacancies, and consequently there are more four-coordinated M²⁺ ions (which can bond C₂H₂) and less five- and six-coordinated M²⁺ (which cannot bond C₂H₂ for stereochemical reasons) on SiO₂. This work demonstrates the effects of cations and substrates on selective acetylene adsorption.

Original language	English
Pages (from-to)	4224-4230
Number of pages	7
Journal	Industrial and Engineering Chemistry Research
Volume	36
Issue number	10
DOIs	https://doi.org/10.1021/ie970207+
State	Published - 1997

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@article{65996029934d4e7f9dca8206c05e397f,

title = "Tailoring New Adsorbents Based on π-Complexation: Cation and Substrate Effects on Selective Acetylene Adsorption",

abstract = "Sorbents were prepared by dispersing various metal cations, M2+ (Fe2+, Co2+, Ni2+), by thermal monolayer dispersion of MCl2 on various high surface area substrates (γ-Al2O3, SiO2, MCM-41 mesoporous zeolite). All sorbents showed reversible and highly selective adsorption for acetylene (C2H2) over other hydrocarbons. This was due to the formation of π-complexation bonds between the M2+ cations and C2H2. The following trend was observed for all substrates studied: Fe2+ > Co2+ > Ni2+. Substrates played an important role in acetylene adsorption, with SiO2-based sorbents outperforming those based on Al2O3. For example, the ratio of C2H2/M2+ for FeCl2/ SiO2 was 1.35, while for FeCl2/Al2O3 the ratio was 0.9. This result is due to the fact that SiO2 has less surface oxygen vacancies, and consequently there are more four-coordinated M2+ ions (which can bond C2H2) and less five- and six-coordinated M2+ (which cannot bond C2H2 for stereochemical reasons) on SiO2. This work demonstrates the effects of cations and substrates on selective acetylene adsorption.",

author = "Joel Padin and Yang, \{Ralph T.\}",

year = "1997",

doi = "10.1021/ie970207+",

language = "English",

volume = "36",

pages = "4224--4230",

journal = "Industrial and Engineering Chemistry Research",

issn = "0888-5885",

publisher = "American Chemical Society",

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T1 - Tailoring New Adsorbents Based on π-Complexation

T2 - Cation and Substrate Effects on Selective Acetylene Adsorption

AU - Padin, Joel

AU - Yang, Ralph T.

PY - 1997

Y1 - 1997

N2 - Sorbents were prepared by dispersing various metal cations, M2+ (Fe2+, Co2+, Ni2+), by thermal monolayer dispersion of MCl2 on various high surface area substrates (γ-Al2O3, SiO2, MCM-41 mesoporous zeolite). All sorbents showed reversible and highly selective adsorption for acetylene (C2H2) over other hydrocarbons. This was due to the formation of π-complexation bonds between the M2+ cations and C2H2. The following trend was observed for all substrates studied: Fe2+ > Co2+ > Ni2+. Substrates played an important role in acetylene adsorption, with SiO2-based sorbents outperforming those based on Al2O3. For example, the ratio of C2H2/M2+ for FeCl2/ SiO2 was 1.35, while for FeCl2/Al2O3 the ratio was 0.9. This result is due to the fact that SiO2 has less surface oxygen vacancies, and consequently there are more four-coordinated M2+ ions (which can bond C2H2) and less five- and six-coordinated M2+ (which cannot bond C2H2 for stereochemical reasons) on SiO2. This work demonstrates the effects of cations and substrates on selective acetylene adsorption.

AB - Sorbents were prepared by dispersing various metal cations, M2+ (Fe2+, Co2+, Ni2+), by thermal monolayer dispersion of MCl2 on various high surface area substrates (γ-Al2O3, SiO2, MCM-41 mesoporous zeolite). All sorbents showed reversible and highly selective adsorption for acetylene (C2H2) over other hydrocarbons. This was due to the formation of π-complexation bonds between the M2+ cations and C2H2. The following trend was observed for all substrates studied: Fe2+ > Co2+ > Ni2+. Substrates played an important role in acetylene adsorption, with SiO2-based sorbents outperforming those based on Al2O3. For example, the ratio of C2H2/M2+ for FeCl2/ SiO2 was 1.35, while for FeCl2/Al2O3 the ratio was 0.9. This result is due to the fact that SiO2 has less surface oxygen vacancies, and consequently there are more four-coordinated M2+ ions (which can bond C2H2) and less five- and six-coordinated M2+ (which cannot bond C2H2 for stereochemical reasons) on SiO2. This work demonstrates the effects of cations and substrates on selective acetylene adsorption.

UR - https://www.scopus.com/pages/publications/0031256143

U2 - 10.1021/ie970207+

DO - 10.1021/ie970207+

M3 - Article

AN - SCOPUS:0031256143

SN - 0888-5885

VL - 36

SP - 4224

EP - 4230

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 10

ER -

Tailoring New Adsorbents Based on π-Complexation: Cation and Substrate Effects on Selective Acetylene Adsorption

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