Lanthanum induced lattice strain improves hydrogen sulfide capacities of copper oxide adsorbents

Abstract

This work probes the effects of La on reactions involving CuO sorbents and H2S in gaseous streams. La‐CuO sorbents with nominal La/Cu atomic ratios of 1:2 achieved higher capacities (27 and 36 g H2S per 100 g sorbent) compared to CuO sorbents (25 g H2S per 100 g sorbent). Comparison of the La‐CuO sorbents using energy dispersive x‐ray spectroscopy and La L3‐edge XAS suggested that increased capacity resulted from more uniform dispersion of La within the CuO phase (3.3 wt.% vs. 1.0 wt.% La). X‐Ray absorption near edge structure analysis suggested more electron‐rich Cu species in La‐CuO samples, while extended X‐ray absorption fine structure modeling showed an increase in single‐scattering path lengths for neighboring and near‐neighbor atoms. These changes suggest that La induces strain in the Cu‐O lattice, thereby increasing H2S capacity by reducing energy barriers associated with surface reactions between oxygen atoms and adsorbed H2S molecules.

Construction of hybrid ionic liquid‐catalysts for the highly effective conversion of H2S by nitriles into thioamides

“…The mainstream strategies for H 2 S capture include amine scrubbing, adsorption, membrane separation, and so on, but they have drawbacks such as low H 2 S uptake, large solvent volatilization, high energy consumption, and complex process flow 2 . With the continuous advancement of exploration and technological updates, a large number of alternative media for traditional absorbents, such as ionic liquids (ILs), deep eutectic solvents (DESs), porous materials, and so on, have emerged 3,4 . As state‐of‐the‐art green solvents, ILs play important roles in the capture of H 2 S thanks to their chemical designability, being adjustable, and low volatility, as well as good affinity for acidic gases.…”

“…advancement of exploration and technological updates, a large number of alternative media for traditional absorbents, such as ionic liquids (ILs), deep eutectic solvents (DESs), porous materials, and so on, have emerged. 3,4 As state-of-the-art green solvents, ILs play important roles in the capture of H 2 S thanks to their chemical designability, being adjustable, and low volatility, as well as good affinity for acidic gases.…”

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

“…5,6 However, previous studies reveal that the pure metal oxides own a poor sulfur capacity due to the aggregated oxide grains and undesirable plugged structures, resulting in insufficient utilization of active components. 7,8 In order to solve this problem, porous supporters such as activated carbon, zeolites, γ-Al 2 O 3 and molecular sieve have been introduced into the preparation of sorbent. [9][10][11] Liu et al synthesized desulfurization sorbent with highly dispersion of active components by combining porous MAS-9 and Ca-based oxides.…”