Direct observation of the kinetics of gas–solid reactions using in situ kinetic and spectroscopic techniques

Hoffman, Adam S.; Azzam, Sara; Zhang, Kai; Xu, Yahong; Liu, Yijin; Bare, Simon R.; Simonetti, Dante A.

doi:10.1039/c8re00020d

Title: Direct observation of the kinetics of gas–solid reactions using in situ kinetic and spectroscopic techniques

Journal Article · Thu Jun 21 00:00:00 EDT 2018 · Reaction Chemistry & Engineering

DOI:https://doi.org/10.1039/c8re00020d· OSTI ID:1484837

Hoffman, Adam S. ^[1]; Azzam, Sara ^[2];

^[3]; Xu, Yahong ^[1];

^[1];

^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of California, Los Angeles, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)

Developing fundamental insight for reactions between gas phase H₂S and solid phase CuO has the potential to lead to improved materials and processes for natural gas purification. However, this insight requires detailed knowledge of the atomistic characteristics of the solid and how these characteristics influence the reaction mechanism and kinetics. Herein, we use fixed bed reactors, X-ray absorption spectroscopy, and transmission X-ray microscopy to simultaneously probe the fundamental kinetics of the reaction of CuO with H₂S to form CuS, and thereby probe spatial-temporal chemical and structural changes of copper during this reaction. H₂S removal reaction kinetics show similar trends in fixed bed reactors as in 10-20 µm sized particles. However, reaction fronts proceed through the entire diameter of particles heterogeneously, indicating the presence of pore diffusion resistance even at very small length scales. In addition, CuO sorbent samples with similar characteristics exhibit 3 times different sulfidation conversion with reaction rate constants that differ by a factor of 1.5. Furthermore, these differences in reaction kinetics and conversion indicate the critical impact of possible atomic scale differences and the formation of different copper sulfide products.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 11535015; U1632110; 56978-DNI5; AC02-76SF00515

OSTI ID:: 1484837

Alternate ID(s):: OSTI ID: 1458581

Journal Information:: Reaction Chemistry & Engineering, Vol. 3, Issue 5; ISSN 2058-9883

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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