Transfer hydrogenation of carbon dioxide and bicarbonate from glycerol under aqueous conditions

Jin

ACS Appl. Mater. Interfaces

et al. 2020

Conversion of CO 2 into fuels and chemicals has been considered to be an important strategy to reduce greenhouse gas emissions and alleviate the energy crisis. Bicarbonate as a CO 2 source is convenient for experimental operation. Herein, based on the synergistic effect of Ni and ZnO benefitting from the electronic transfer, ultrasmall Ni−ZnO clusters (∼2 nm) stabilized by microporous silica nanoparticles were designed and prepared for catalyzing the hydrogenation of sodium bicarbonate to formic acid. The yield of formic acid reached up to 97.0% at 260 °C/3 MPa for 2 h, which is higher than those reported non-noble metal-based catalysts. The good performance of Ni−ZnO/SiO 2 can be attributed to the ultrasmall active component size and the synergy effect based on electron transfer between Ni and ZnO.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasmall Ni–ZnO/SiO₂ Synergistic Catalyst for Highly Efficient Hydrogenation of NaHCO₃ to Formic Acid

Jin

ACS Appl. Mater. Interfaces

et al. 2020

“…Along the direction of utilizing glycerol as hydrogen donors for the TH reactions, Voutchkova‐Kosta reported TH of CO 2 to formate under basic conditions catalyzed by a water‐soluble ruthenium‐NHC complex ( Ru‐16 , Figure 13). [205] The catalytic activity was found to be dependent on the pH as under low pH conditions the reverse reaction i. e. dehydrogenation of HCOOH to CO 2 was also operative. A higher pH was achieved by reducing CO 2 pressure as the solubility of KOH would increase on decreasing CO 2 concentration.…”

Section: Dehydrogenation Of Glycerolmentioning

confidence: 95%

Homogeneous (De)hydrogenative Catalysis for Circular Chemistry – Using Waste as a Resource

Kumar

Gao

2020

ChemCatChem

Increasing production and usage of several consumer products and energy sources have resulted in the accumulation of a substantial amount of waste products that are toxic and/or difficult to biodegrade, thus creating a severe threat to our planet. With the recently advocated concepts of circular chemistry, an attractive approach to tackle the challenge of chemical waste reduction is to utilize these waste products as feedstocks for the production of useful chemicals. Catalytic (de)hydrogenation is an atom‐economic, green and sustainable approach in organic synthesis, and several new environmentally benign transformations have been reported using this strategy in the past decade, especially using well‐defined transition metal complexes as catalysts. These discoveries have demonstrated the impact and untapped potential of homogeneous (de)hydrogenative catalysis for the purpose of converting chemical wastes into useful resources. Four types of chemical waste that have been (extensively) studied in recent years for their chemical transformations using homogeneous catalytic (de)hydrogenation are CO2, N2O, plastics, and glycerol. This review article highlights how these chemical wastes can be converted to useful feedstocks using (de)hydrogenative catalysis mediated by well‐defined transition metal complexes and summarizes various types of homogeneous catalysts discovered for this purpose in recent years. Moreover, with examples of hydrogenative depolymerization of plastic waste and the production of virgin plastic via dehydrogenative pathways, we emphasize the potential applications of (de)hydrogenation reactions to facilitate closed‐loop production cycles enabling a circular economy.

“…Later, Heltzel et al . described the transfer hydrogenation of CO 2 to potassium formate applying glycerol as hydrogen carrier and achieved a TON of 1065 . Using methanol as the hydrogen source, Beller and co‐workers achieved a TON up to 12308 for formates, using a Ru‐Macho catalyst .…”

Section: Methodsmentioning

confidence: 99%

Transfer Hydrogenation of Carbon Dioxide to Methanol Using a Molecular Ruthenium‐Phosphine Catalyst

Westhues

Klankermayer

2019

ChemCatChem