Beyond upper bound estimates of active site densities in heterogeneous catalysis: A note on the critical role of titrant pressure
Beyond upper bound estimates of active site densities in heterogeneous catalysis: A note on the critical role of titrant pressure
复制标题
超越多相催化中活性位点密度的上限估计:关于滴定剂压力的关键作用的说明
DOI:
10.1016/j.jcat.2022.06.006
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发表时间:
2022
影响因子:
7.3
通讯作者:
Bollini, Praveen
中科院分区:
文献类型:
--
作者:
Afrin, Sadia;Bollini, Praveen
In-situ titrations employed in the estimation of active site densities oftentimes only provide upper bound estimates, not true active site densities. Discounting unselective contributions that result in a disparity between the two requires a treatment of transient titration data more nuanced than merely integrating under the titrant breakthrough curve. Three methods for estimating site densities (and turnover frequencies) are presented in the context of ceria-catalyzed ethene hydrogenation, and their strengths and limitations discussed. Readily accessible supra-monolayer coverages of CO prevalent on ceria surfaces help bring into relief considerations relating to unselective adsorption and active site heterogeneity common, yet infrequently addressed, in the characterization of heterogeneous catalysts using in-situ titration methods.
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DOI:
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发表时间:
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期刊:
Physical chemistry chemical physics : PCCP
影响因子:
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