Assembling Co clusters via nanosized ZIF-67 sprouted from CoAl-LDH nanoflower for selective hydrogenation

The quantitative conversion of polyethylene terephthalate (PET) and Coca-Cola bottles to p-xylene over Co-based catalysts with tailored activities for deoxygenation and hydrogenation

“…Fig. 4b shows that the peaks centered at 778.4, 779.6, and 796.1 eV could be attributed to Co 0 , 29,30 and the peaks at 782.2, 797.5, and 803.1 eV were ascribed to Co 2+ 2p3/2 and Co 2+ 2p1/2, respectively, 30,31 indicating the presence of the CoO x species. The peaks at 780.4 and 797.0 eV belonged to Co 3+ 2p3/2 and Co 3+ 2p1/2, 32 which was due to the passivation treatment and partial reduction of the Co species (Table S1†).…”

“…attributed to Co 0 , 29,30 and the peaks at 782.2, 797.5, and 803.1 eV were ascribed to Co 2+ 2p3/2 and Co 2+ 2p1/2, respectively, 30,31 indicating the presence of the CoO x species. The peaks at 780.4 and 797.0 eV belonged to Co 3+ 2p3/2 and Co 3+ 2p1/2, 32 which was due to the passivation treatment and partial reduction of the Co species (Table S1 † Lower ratios of Co 0 (6.4%) and Co 2+ (30.7%), but a higher ratio of Co 3+ (62.8%), were obtained in Co-Fe-Al (Fig.…”

Nitrogen-Doped Graphene@Co/C Composite Aerogel Microspheres for Highly Efficient Electromagnetic Wave Absorption

“…The highresolution HRTEM image (Figure 3d3) reveals lattice stripes on the Co/C nanoparticles with a layer spacing of 0.34 nm, which is consistent with the (002) crystal plane of the carbon phase. 29,30 Additionally, lattice stripes with a layer spacing of 0.20 nm are observed on the Co/C nanoparticles, corresponding to the (111) crystal plane of metallic Co. 21 These findings suggest that ZIF-67 maintains its carbon skeleton during thermal decomposition while it reduces Co ions into metallic Co. In Figure S2, the single Co/C nanoparticles without graphene aerogel microspheres show a porous structure with a specific surface area of 271.0 m g −2 and a pore size of 0.2 nm.…”

Selective Hydrogenative Rearrangement of Furfural to Cyclopentanol over Alloyed Cu–Co Supported on Sulfur-Doped Coffee Biochar

“…The increasing depletion of fossil resources and their impact on the climate have brought challenges of energy crisis and environmental pollution to humanity. − To solve these issues, utilizing abundant renewable biomass and its derivatives as chemical feedstock for the production of high-value chemicals and fuels is a promising choice. − As an important biomass platform molecule and a representative α,β-unsaturated compound derived from lignocellulose, furfural (FAL) could be further transformed into various high-value downstream products such as furfuryl alcohol (FFA), − cyclopentanone (CPO), , cyclopentanol (CPL), , tetrahydrofurfuryl alcohol (THFA), 2-methylfuran (2-MF), tetrahydrofuran (THF), and diols − via several transformation routes, including hydrogenation, rearrangement, and hydrogenolysis, as shown in Scheme . Among the various value-added products, CPL serves as a key intermediate in the production of pharmaceuticals, rubber chemicals, fungicides, pesticides, etc …”