Insights into influence of nanoparticle size and metal–support interactions of Cu/ZnO catalysts on activity for furfural hydrogenation

Abstract

Cu/ZnO catalysts primarily derived from aurichalcite with Cu/Zn = 0.4–1.1 (mol/mol) were prepared via “decreased pH” coprecipitation method and introduced in hydrogenation of furfural to furfuryl alcohol.

In situ fabrication of CuO/UHMWPE nanocomposites and their tribological performance

“…This might be due to the high surface energy of nanosized CuO particles, which leads to a strong interaction with matrix materials. In the process of binding, some electrons were transferred to the surface of matrix materials, which is similar to “SMSI” effect observed on the supported metal catalysts …”

“…Therefore, the CuO crystal filled in UHMWPE can promote the crystallization of the matrix UHMWPE, indicating a role of heterogeneous nucleation. Superfluous CuO nanofiller, however, results in a decrease in degree of crystallinity of the matrix, which might be ascribed to the loss of the continuity of the organic matrix and/or the adverse agglomeration of the inorganic nanofiller …”

“…The characteristic peaks at binding energies of 935.0 and 955.0 eV can be assigned to Cu 2p3/2 and Cu 2p1/2, respectively . The satellite peaks located at higher binding energy, which are the shakeup peaks of the core level signals of Cu 2p and can be assigned to 3d 9 configuration of the copper atoms, indicate the presence of CuO in the composite . The XP spectra of Cu 2p3/2 and Cu 2p 1/2 of 1CuO/UHMWPE prepared in this work is found a shift to the direction of high binding energy and presents an enhanced chemical state.…”

Influence of the Incorporation of Basic or Amphoteric Oxides on the Performance of Cu-Based Catalysts Supported on Sepiolite in Furfural Hydrogenation

“…The use of amphoteric or basic supports, such as ZnO and MgO, favors metal-support interaction, which can increase the number of available active centers and so the catalytic activity, as well as the resistance to deactivation due to a weaker interaction with FUR molecules. Thus, different supports have been used for the preparation of Cu-based catalysts: SiO 2 [16,[25][26][27], Al 2 O 3 [25,28], MgO [22,23,29,30], ZnO [25,[31][32][33], and CeO 2 [34], and their catalytic activity in FUR hydrogenation has been evaluated. In this sense, our research group has recently showed that the strong interaction of Cu 0 sites with the amphoteric ZnO avoids the deactivation of the Cu species by a sintering process, especially for the Cu/ZnO catalyst with the lowest metal content, which still shows a FOL yield of 60 mol% after 24 h of TOS [31].…”

Oriented Isomorphous Substitution: An Efficient and Alternative Route to Fabricate the Zn Rich Phase Pure (Cu1−x,Znx)2(OH)2CO3 Precursor Catalyst for Methanol Synthesis

“…[49,64] Significant efforts are made to develop the new synthetic strategies that could likely replace the state-of-the-art "coprecipitation" route in order to achieve better physicochemical properties of the Cu/ZnO based catalysts. The comparison of the physicochemical properties of the catalysts derived from different techniques [14,16,[68][69][70][71][72] with the present IS method has been summarized in brief in Table 2. It is noteworthy that the catalysts prepared from phase pure zM precursor exhibit high SA Cu and smaller crystallite size of CuO as compared to those of the rest of the systems.…”