Topic
Chemisorption
About: Chemisorption is a research topic. Over the lifetime, 16298 publications have been published within this topic receiving 554989 citations.
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160 citations
TL;DR: In this article, the authors showed that the addition of CeO 2 enlarged the catalyst pores, moderated the interaction between Ni and alumnia, suppressed Ni 0 crystallites from sintering, and improved the recombinative desorption of N adatoms from the Ni 0 surface.
Abstract: Effects of CeO 2 addition on the catalytic performance of Ni/Al 2 O 3 catalysts for ammonia decomposition to hydrogen were investigated by activity studies and some physico-chemical methods like N 2 -adsorption/-desorption, H 2 -chemisorption, X-ray diffraction (XRD), H 2 temperature-programmed reduction (H 2 -TPR) and NH 3 temperature-programmed surface reduction (NH 3 -TPSR). The results showed that the addition of CeO 2 greatly improved the catalytic activity and stability of Ni/Al 2 O 3 catalysts for ammonia decomposition to CO x -free hydrogen. 98.3% NH 3 conversion and 32.9 mmol/(min g cat ) H 2 formation rate were achieved over CeO 2 promoted Ni/Al 2 O 3 catalyst at 823 K and 30 000 ml/(h g cat ) NH 3 space velocity. The characterization results indicate that the addition of CeO 2 enlarged the catalyst pores, moderated the interaction between Ni and alumnia, suppressed Ni 0 crystallites from sintering, and improved the recombinative desorption of N adatoms from the Ni 0 surface.
159 citations
TL;DR: In this paper, thin copper overlayers on a Ru single-crystal surface were prepared as models for Cu/Ru “bimetallic cluster” catalysts, and various amounts of copper were deposited at 540 K on a ruthenium(0001) crystal surface.
159 citations
TL;DR: In this article, the interaction between Pt and CeO2 under reducing and oxidizing conditions as well as its effect on the thermal stability of Pt/CeO2 were extensively investigated by means of N2 adsorption/desorption, Raman spectroscopy, CO chemisorption and H2 TPR, XRD, and XPS techniques.
Abstract: The interaction between Pt and CeO2 under reducing and oxidizing conditions as well as its effect on the thermal stability of Pt/CeO2 were extensively investigated by means of N2 adsorption/desorption, Raman spectroscopy, CO chemisorption, H2 TPR, XRD, and XPS techniques In situ and ex situ Raman spectroscopy showed that Pt is anchored with the surface oxygen of CeO2 by forming Pt–O–Ce bond during the oxidative treatment of Pt/CeO2 Under the reducing condition, the static CO chemisorption presented that the amount of CO adsorbed on CeO2 is almost equal to that on Pt/CeO2, implying that Pt atom is located on the oxygen vacancy generated on reduced CeO2 surface Strong Pt–O–Ce bond maintained the textural properties of Pt/CeO2 from oxidative treatment at temperature as high as 800 °C, as evidenced by the XRD patterns and BJH curves of the samples Selective removal of the surface oxygen of Pt/CeO2 resulted in the decreased thermal stability of Pt/CeO2 due to the loss of Pt–O–Ce bond Stronger interaction
159 citations
TL;DR: In this article, the chelating adsorption property and mechanism of PAO/SiO 2 particles towards heavy metal ions were mainly investigated, and the adsorship thermodynamics was also researched.
159 citations