نتایج جستجو برای: brönsted acid

تعداد نتایج: 747496  

Journal: :The Biochemical journal 1992
D G Hall

Brönsted-Bjerrum theory [Brönsted (1922) Z. Phys. Chem. 102, 169-207; (1925) Z. Phys. Chem. 115, 337-364; Bjerrum (1924) Z. Phys. Chem. 108, 82-100] as applied to reactions at interfaces is used to interpret published data on the lipolysis of dinonanoyl phosphatidylcholine monolayers by pancreatic phospholipase A2. Reasonable quantitative agreement between theoretical and experimental results o...

2012
Mi-Jin Jeon Seung-Soo Kim Jong-Ki Jeon Sung Hoon Park Ji Man Kim Jung Min Sohn See-Hoon Lee Young-Kwon Park

Catalytic fast pyrolysis of waste rice husk was carried out using pyrolysis-gas chromatography/mass spectrometry [Py-GC/MS]. Meso-MFI zeolite [Meso-MFI] was used as the catalyst. In addition, a 0.5-wt.% platinum [Pt] was ion-exchanged into Meso-MFI to examine the effect of Pt addition. Using a catalytic upgrading method, the activities of the catalysts were evaluated in terms of product composi...

Journal: :Physical chemistry chemical physics : PCCP 2013
Xufeng Lin Yuanyuan Qu Yanhong Lv Yanyan Xi David Lee Phillips Chenguang Liu

The dehydration mechanisms for glucose in β-pyranose (BP) and in open-chain (OC) forms, catalyzed by acids homogeneously and heterogeneously, were investigated using density functional and two-layer ONIOM calculations. The first dehydration reaction and competing reaction pathways are the main focus of the present study. The energetics of five dehydration and two isomerization pathways were exa...

Journal: :Molecules 2018
Tianlu Chen Chunrong Xiong Yousheng Tao

Mesoporous ZSM-5 prepared by alkaline treatment was demonstrated as an efficient catalyst for the cellulose hydrolysis in ionic liquid (IL), affording a high yield of reducing sugar. It was demonstrated that mesoporous ZSM-5 (SiO₂/Al₂O₃ = 38) had 76.2% cellulose conversion and 49.6% yield of total reducing sugar (TRS). In comparison, the conventional ZSM-5 had a mere 41.3% cellulose conversion ...

Journal: :Catalysis Today 2021

• The dual site consisting of Al or Zr the support and Cu species is active. DFT indicates synergy acid sites supports species. Copper dispersion a sensitivity descriptor for activity. Glycerol produced in large quantities as byproduct biodiesel, among others hydroxyacetone (acetol) an important commodity obtained from glycerol. Metallic has been identified active dehydration glycerol to metal ...

Journal: :Research on Chemical Intermediates 2021

A correction to this paper has been published: https://doi.org/10.1007/s11164-021-04495-7

Journal: :The Journal of organic chemistry 2009
Pedro Rodriguez-Dafonte François Terrier Sami Lakhdar Sergei Kurbatov Régis Goumont

Superelectrophilic 7-chloro-4,6-dinitrobenzofuroxan (DNBF-Cl) and 7-chloro-4,6-dinitrobenzofurazan (DNBZ-Cl) are shown to undergo facile carbon-carbon couplings with a series of weak carbon nucleophiles consisting of a number of differently substituted indoles, 1,2,5-trimethylpyrrole and azulene, in acetonitrile. Despite the fact that steric effects preclude a coplanarity of the donor and accep...

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