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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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TL;DR: In this paper, a machine-learning algorithm was integrated into the descriptor-based design approach for rapid screening of transition-metal catalysts, which can capture complex, nonlinear adsorbate/substrate interactions with the root mean squared errors (RMSE) ∼ 0.12
162 citations
TL;DR: The fabrication of a thiol-functionalized cellulose nanofiber membrane that can effectively adsorb heavy metal ions is reported, highlighting the significance of surface functionality on biocompatible, nontoxic, and sustainable cellulose materials to expand their potential and applicability towards water remediation applications.
162 citations
TL;DR: In this paper, a tracer (tritium) method was used to establish the chemisorption isotherm of stearic acid on a CaCO3 filler and the induced changes in surface properties have been studied.
162 citations
TL;DR: In this paper, the preparation, characterization, and adsorption properties of Mn 2+ by manganese oxide coated zeolite (MOCZ) and its ability in removing Mn 2 + by adaption were investigated.
162 citations
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TL;DR: In the case of methanol catalysts, the active component of these catalysts is Cu metal with the ZnO simply being involved as the preferred supporting support as discussed by the authors.
Abstract: Methanol, like ammonia, is one of the key industrial chemicals produced by heterogeneous catalysis. As with the original ammonia catalyst (Fe/K/Al2O3), so with methanol, the original methanol synthesis catalyst, ZnO, was discovered by Alwin Mittasch. This was translated into an industrial process in which methanol was produced from CO/H2 at 400 °C and 200 atm. Again, as with the ammonia catalyst where the final catalyst which is currently used was achieved only after exhaustive screening of putative “promoters”, so with methanol, exhaustive screening of additives was undertaken to promote the activity of the ZnO. Early successful promoters were Al2O3 and Cr2O3 which enhanced the stability of the ZnO but not its activity. The addition of CuO was found to increase the activity of the ZnO but the catalyst so produced was short lived. Current methanol synthesis catalysts are fundamentally Cu/ZnO/Al2O3, having high CuO contents of ~60 % with ZnO ~ 30 % and Al2O3 ~ 10 %. Far from promoting the activity of the ZnO by incorporation of CuO, the active component of these Cu/ZnO/Al2O3 catalysts is Cu metal with the ZnO simply being involved as the preferred support. Other supports for the Cu metal, e.g. Al2O3, MgO, MnO, Cr2O3, ZrO2 and even SiO2 can also be used. In all of these catalysts the activity scales with the Cu metal area. The original feed has now changed from CO/H2 to CO/CO2/H2 (10:10:80), radiolabelling studies having provided the unlikely discovery that it is the CO2 molecule which is hydrogenated to methanol; the CO molecule acts as a reducing agent. The CO2 is transformed to methanol on the Cu through the intermediacy of an adsorbed formate species. These Cu/ZnO/Al2O3 catalysts now operate at ~230° and between 50 and 100 atm. This important step change in the activity of methanol synthesis has resulted in a significant reduction in the energy required to produce methanol. The “step change” however has been incremental. It has been obtained on the basis of fundamental knowledge provided by a combination of surface science techniques, e.g. LEED, scanning tunnelling microscope, TPD, temperature programmed reaction spectroscopy, combined with catalytic mechanistic studies, including radiolabelling studies and chemisorption studies including reactive chemisorption studies, e.g. N2O reactive frontal chromatography.
162 citations