Synthesis of Pd-M@HCS(M = Co, Ni, Cu) Bimetallic Catalysts and Their Catalytic Performance for Direct Synthesis of H2O2

Abstract

Hydrogen peroxide (H2O2), as a clean and green oxidant, is widely used in many fields. The direct synthesis of H2O2 (DSHP) from H2 and O2 has attracted most research interest because it relates to a facile, environmentally friendly, and economic process. Yolk–shell Pd-M@HCS (hollow carbon sphere) (M = Co, Ni, Cu) nanocatalysts, in which the bimetal nanoparticle is the core and porous carbon works as the shell layer, are reported in this work. It was found that catalytic activities were enhanced because of the introduced M metals. Additionally, the different mass ratios of Pd to Co (mPd/mCo) were further investigated to improve the catalytic performance for the DSHP. When mPd/mCo was 4.4, the prepared Pd-Co@HCS-(4.4) catalyst, with an average Pd nanoparticle size of 7.30 nm, provided the highest H2O2 selectivity of 87% and H2O2 productivity of 1996 mmolgPd−1·h−1, which were increased by 24% and 253%, respectively, compared to Pd@HCS.

Palladium/Stannic Oxide Interfacial Chemistry Promotes Hydrogen Oxidation Reactions in Alkaline Medium

“…[44] The little difference in the diffraction patterns of the MOFs is traced to the difference in the ligands' architectural structures. After decomposition of the frameworks by heating, diffraction patterns at 25 [45] Chemically etched Co/MOFDC removes almost all the diffraction patterns corresponding to Co and Co 3 O 4 nanoparticles, producing a more pronounced peak at 25.8°for C(002) in the MOFDC. Figure 2c shows the diffraction patterns of the electrocatalysts.…”

“…Modification of nanostructured Pd with the cocatalysts like Ag, Sn, Ni, Cu improves the electrocatalytic performance of the Pdbased electrocatalysts. [23][24][25][26] This research reports nanostructured Pd-based electrocatalysts: (i) nanostructured Pd/SnO 2 on MOFderived carbon (Pd/SnO 2 /MOFDC) and its monometallic component (Pd/MOFDC) using microwave-assisted synthesis methods and demonstrated for the alkaline HOR. The choice of tin (IV) oxide (SnO 2 ) is because it is naturally abundant as cassiterite ore, and can easily be synthesized in the laboratory.…”

Comparing Catalysts of the Direct Synthesis of Hydrogen Peroxide in Organic Solvent: is the Measure of the Product an Issue?

“…For this paper we have reviewed 79 papers dealing with the DS and published since 2000 to date [8–80] (Figure 1). Out of them three regrettably did not report how the amount of H 2 O 2 was measured [81–83] .…”

Oxidation of Benzyl Alcohol Using Cobalt Oxide Supported Inside and Outside Hollow Carbon Spheres

“…[9,[16][17][18][19][20] Fewer studies have been reported in which a metal catalyst has been placed inside the HCSs; these studies include reports on Pt, Pd, Cu, Co, Au and alloys as catalysts. [21][22][23][24][25][26][27][28] Comparative studies in which metals have been placed both inside and outside HCSs are rare. In this study we have supported Co oxide nanoparticles both inside and outside HCSs and wish to compare their different catalytic activities/selectivities.…”

“…Numerous studies that have been reported in which metals have been placed outside a HCS revealed that the carbon acts as a classical carbon support [9,16–20] . Fewer studies have been reported in which a metal catalyst has been placed inside the HCSs; these studies include reports on Pt, Pd, Cu, Co, Au and alloys as catalysts [21–28] . Comparative studies in which metals have been placed both inside and outside HCSs are rare.…”