Plant-mediated synthesis of AgPd/γ-Al₂O₃ catalysts for selective hydrogenation of 1,3-butadiene at low temperature

Abstract

Plant-mediated synthesis of bimetallic AgPd/γ-Al2O3 catalysts for selective hydrogenation of low-temperature 1,3-butadiene was reported.

(Ag)Pd-Fe3O4 Nanocomposites as Novel Catalysts for Methane Partial Oxidation at Low Temperature

“…This low-intensity peak turns into a small broadband within the 2θ range from 38.7 to 41.6 • for the bimetallic 3% AgPd-Fe 3 O 4 sample. This band, along with the glimpsed wide bump centered at 45.5 • , is in full agreement with previously reported XRD patterns of bimetallic AgPd alloys presenting fcc crystalline structure [41][42][43][44], especially with those containing Ag:Pd molar ratio of 2:8 [42] or between 3:7 and 1:9 [41]. The main XRD diffraction of metal Pd is barely observed for the 2% Pd-Fe 3 O 4 sample and the region becomes totally flat for the 1% Pd-Fe 3 O 4 , which is coherent to the quantitative detection limit (<2%) associated to the XRD technique for multiphase mixtures [45].…”

“…This lowintensity peak turns into a small broadband within the 2θ range from 38.7 to 41.6° for the bimetallic 3% AgPd-Fe3O4 sample. This band, along with the glimpsed wide bump centered at 45.5°, is in full agreement with previously reported XRD patterns of bimetallic AgPd alloys presenting fcc crystalline structure [41][42][43][44], especially with those containing Ag:Pd molar ratio of 2:8 [42] or between 3:7 and Furthermore, semiquantitative analysis of the XRD data by X'Pert Highscore Plus software confirmed the major presence of an orthorhombic Fe 3 O 4 structure in all (Ag)Pd-Fe 3 O 4 catalysts from Figure 3. Only for 1% Pd-Fe 3 O 4 and 3% AgPd-Fe 3 O 4 samples did the semiquantitative phase analysis provide a minor coexistence with the cubic Fe 3 O 4 structure (ca.…”

“…On the other hand, an additional low-intensity peak at 2θ = 40.1° can be observed for the 3% Pd-Fe3O4 catalyst (Figure 3c), which corresponds to the (111) plane of metal Pd [41,42,44]. This lowintensity peak turns into a small broadband within the 2θ range from 38.7 to 41.6° for the bimetallic 3% AgPd-Fe3O4 sample.…”

“…XRD patterns of nanocomposite catalysts based on magnetite (from 85 • C synthesis using Fe 3+ /Fe 2+ molar ratio of 4) doped with Pd or Pd -Ag: 1% Pd-Fe 3 O 4 (a), 2% Pd-Fe 3 O 4 (b), 3% Pd-Fe 3 O 4 (c), 3% AgPd-Fe 3 O 4 (d). Symbols: (---) Fe 3 O 4 (ICSD: 01-075-1609); the highlighted strip defines the region where the highest intensity diffractions for pure Pd, pure Ag, and AgPd alloys are found[41][42][43][44].…”

Bimetallic Au–Pd alloy nanoparticles supported on MIL-101(Cr) as highly efficient catalysts for selective hydrogenation of 1,3-butadiene

“…16,17 Recently, bimetallic nanoparticle catalysts have attracted much attention in heterogeneous catalysis. 13,[18][19][20][21][22] Bimetallic catalysts generally show better catalytic performance than the corresponding monometallic catalysts because catalytic activity could be enhanced by synergistic effects between different components. 23 Hou et al reported that the bimetallic PdNi/g-Al 2 O 3 catalyst shows higher BD hydrogenation activity and 1butene selectivity than Pd/g-Al 2 O 3 and Ni/g-Al 2 O 3 catalysts.…”