Single-atom Au-modified CeO2 catalyst: Structure and its catalytic performance in 2,4-diaminotoluene methoxycarbonylation reaction

Ji, Lu; Li, Fang; Che, Conghui; Xue, Wei; Yang, Qiusheng; Ding, Xiaoshu; Zhang, Dongsheng; Zhao, Xinqiang; Wang, Yanji

doi:10.1016/j.apcata.2023.119459

Cited by 2 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oxidative carbonylation of amines necessitates the presence of oxidants, such as molecular oxygen, 25−27 nitro compounds, iodine, quinone, its derivatives, 28 or unsaturated organic substances. 29,30 Among these, molecular oxygen serves 42 Zn/SiO 2 6 80 2:1 68.5 --hexamethylenediamine 43 KATriz 10 30 3:1 ---∼100 aniline 44 [BuDBU]Ala IL 4 120 10:1 89.9 --aniline 45 ZrO 2 /SiO 2 7 170 20:1 ---80.1 aniline 46 ZIF-7 (Zn(BeIM) 2 ) 2 190 12:1 92.0 --aniline 47 Ce 0.98 Zr 0.02 O 2 7.5 140 30:1 88.0 --toluene diamine 48 Zr-MOF-808@MCM-41 3 160 12:1 95/0 --toluene diamine 49 CeO 2 7.5 140 30:1 90.0 --toluene diamine 50 Au as the primary oxidant. This reaction entails a mixture of CO and O 2 , which can be potentially explosive within a specific concentration range.…”

Section: Oxidative Carbonylation Of Amine Compoundsmentioning

confidence: 99%

How To Get Isocyanate?

Guo,

Ding,

Wang

2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

Isocyanate, a pivotal chemical intermediate to synthesize polyurethane with widespread applications in household appliances, automobiles, and construction, is predominantly produced via the phosgene process, which currently holds a paramount status in industrial isocyanate production. Nonetheless, concerns arise from the toxicity of phosgene and the corrosiveness of hydrogen chloride, posing safety hazards. The synthesis of isocyanate using nonphosgene methods represents a promising avenue for future development. This article primarily focuses on the nonphosgene approach, which involves the formation of carbamate through the reaction of nitro-amino compounds with carbon monoxide, dimethyl carbonate, and urea, among other reagents, subsequently leading to the thermal decomposition of carbamate to get isocyanate. This paper emphasizes the progress in catalyst development during the carbamate decomposition process. Single-component metal catalysts, particularly zinc, exhibit advantages such as high activity, cost-effectiveness, and compatibility with a wide range of substrates. Composite catalysts enhance isocyanate yield by introducing a second component to adjust the active metal composition. The central research direction aims to optimize catalyst adaptation to reaction conditions, including temperature, pressure, time, and solvent, to achieve high raw material conversion and product yield.

show abstract

Section: Oxidative Carbonylation Of Amine Compoundsmentioning

confidence: 99%

How To Get Isocyanate?

Guo,

Ding,

Wang

2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“…CeO 2 has been extensively studied in the field of catalytic organic synthesis due to its reversible Ce 3+ /Ce 4+ redox pair, abundant oxygen vacancies, and tunable surface acid–base properties. , Different morphologies of CeO 2 correspond to different exposed crystal surfaces and acid–base properties . The crystal surface is an important factor affecting the acid–base properties of CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Well-Defined CeO₂ as Efficient Catalysts for the Green Synthesis of Pentamethylene Dicarbamate via Carbonylation of 1,5-Pentanediamine with Methyl Carbamate

Wei,

Wang,

Zhang

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Bio-based pentamethylene dicarbamate (PDC) belongs to N-substituted carbamates, which are important fine chemicals and organic intermediates. In this work, well-defined CeO 2 rods, cubes, and octahedrons were successfully prepared to catalyze the synthesis of PDC by carbonylation of 1,5-pentanediamine (PDA) with methyl carbamate (MC). Among them, CeO 2 rods with higher amounts of acid−base sites and abundant oxygen vacancies showed superior intrinsic activity in the PDA carbonylation reaction. In situ FTIR results showed that intermediate polyureas were readily formed in the reaction, and then, CeO 2 rods promoted the alcoholysis of polyureas to PDC. In situ DRIFTS results indicated that the surface of CeO 2 rods is more favorable for the adsorption and activation of the reactants. CeO 2 rods can also be used for the efficient synthesis of a series of N-substituted carbamates. We believe that this work will contribute to the efficient, green, and sustainable production of N-substituted carbamates.

show abstract

Single-atom Au-modified CeO2 catalyst: Structure and its catalytic performance in 2,4-diaminotoluene methoxycarbonylation reaction

Cited by 2 publications

References 44 publications

How To Get Isocyanate?

How To Get Isocyanate?

Well-Defined CeO₂ as Efficient Catalysts for the Green Synthesis of Pentamethylene Dicarbamate via Carbonylation of 1,5-Pentanediamine with Methyl Carbamate

Contact Info

Product

Resources

About

Single-atom Au-modified CeO2 catalyst: Structure and its catalytic performance in 2,4-diaminotoluene methoxycarbonylation reaction

Cited by 2 publications

References 44 publications

How To Get Isocyanate?

How To Get Isocyanate?

Well-Defined CeO2 as Efficient Catalysts for the Green Synthesis of Pentamethylene Dicarbamate via Carbonylation of 1,5-Pentanediamine with Methyl Carbamate

Contact Info

Product

Resources

About

Well-Defined CeO₂ as Efficient Catalysts for the Green Synthesis of Pentamethylene Dicarbamate via Carbonylation of 1,5-Pentanediamine with Methyl Carbamate