Role of surface oxygen in the reaction of NO with NH3 over chromia catalyst
作者:H NIIYAMA
DOI:10.1016/0021-9517(80)90055-x
日期:1980.5
The role of surface oxygen on chromia for the reaction of nitrogen oxide (NO) with ammonia (NH3) was investigated. The activity of preoxidized catalyst was initially very high but settled to a stationary value in a few minutes after the surface oxygen had been consumed. There are two kinds of surface oxygen, of high and low oxidizing power. The former is that of chromate and is responsible for the
The formation of isocyanic acid during the reaction of NH with NO and excess CO over silica-supported platinum, palladium, and rhodium
作者:N CANT、D CHAMBERS、I LIU
DOI:10.1016/j.jcat.2005.01.022
日期:2005.4.1
The reaction between NH3 and NO in excess CO over silica-supported platinum, palladium, and rhodium has been investigated for temperatures from 100 to 450 °C. As found previously for the corresponding reactions of H2/NO/COmixtures, isocyanicacid (HNCO) is produced with each catalyst. With Pd/SiO2, the peak yield when NH3 is used is 46% based on the total nitrogen converted and 55% based on the hydrogen
已经研究了在100至450°C的温度下,与二氧化硅负载的铂,钯和铑相比,过量CO中的NH 3和NO之间的反应。如之前对于H 2 / NO / CO混合物的相应反应所发现的,每种催化剂都会生成异氰酸(HNCO)。对于Pd / SiO 2,使用NH 3时的峰值产率为46%(基于转化的总氮)和55%(基于从NH 3吸收的氢),其余的氢转化为水。Pt / SiO 2上的反应需要更高的温度,效率更高,HNCO的最高产率(基于氮)为70%,基于氢为95%。几乎没有水作为产物与铂从H 2 O / NO / CO混合物生产HNCO的高活性有关,而铂的高活性又是由水煤气变换反应的活性驱动的。NH 3 / NO / CO混合物中的HNCO的峰值收率与Rh / SiO 2相比要低得多(基于氮为10%),并且与铂和钯催化剂的收率不同,该收率低于在H2CO处理过程中观察到的收率。 H 2 + NO + CO反应(30%)。在使用15
Homogeneous catalytic reduction of nitrous and nitric oxides to dinitrogen by carbon monoxide
作者:W. P. Fang、C. H. Cheng
DOI:10.1039/c39860000503
日期:——
Catalyticreductions of N2O and NO by CO to N2 can be achieved at 100 °C in solutions containing Rh2(CO)4Cl2 and a base: the highest rate for the N2O reduction of 25.2 turnovers per hour in dimethyl sulphoxide was obtained using KOH as the base.
Lewis Acid Activation of the Ferrous Heme–NO Fragment toward the N–N Coupling Reaction with NO To Generate N<sub>2</sub>O
作者:Erwin G. Abucayon、Rahul L. Khade、Douglas R. Powell、Yong Zhang、George B. Richter-Addo
DOI:10.1021/jacs.7b13681
日期:2018.3.28
(OEP)Fe(NO) activates it toward N-N bond formation with NO to generate N2O. 15N-isotopic labeling reveals a reversible nitrosyl exchange reaction and follow-up N-O bond cleavage in the N2O formation step. Other Lewis acids (B(C6F5)3 and K+) also promote the NO coupling reaction with (OEP)Fe(NO). These results, complemented by DFT calculations, provide experimental support for the cis: b3 pathway in bacNOR
细菌 NO 还原酶 (bacNOR) 酶利用血红素/非血红素活性位点将两个 NO 分子与 N2O 偶联。我们表明,BF3 与 (OEP)Fe(NO) 中亚硝酰基 O 原子的配位将其激活,使其与 NO 形成 NN 键以生成 N2O。15N 同位素标记揭示了在 N2O 形成步骤中可逆的亚硝酰基交换反应和后续的 NO 键断裂。其他路易斯酸(B(C6F5)3 和 K+)也促进 NO 与 (OEP)Fe(NO) 的偶联反应。这些结果与 DFT 计算相辅相成,为 bacNOR 中的 cis: b3 通路提供了实验支持。
Electrocatalytic Reductions of Nitrite, Nitric Oxide, and Nitrous Oxide by Thermophilic Cytochrome P450 CYP119 in Film-Modified Electrodes and an Analytical Comparison of Its Catalytic Activities with Myoglobin
作者:Chad E. Immoos、Ju Chou、Mekki Bayachou、Emek Blair、John Greaves、Patrick J. Farmer
DOI:10.1021/ja038925c
日期:2004.4.1
Previous investigations of nitrite and nitric oxide reduction by myoglobin in surfactantfilm modified electrodes characterized several distinct steps in the denitrification pathway, including isolation of a nitroxyl adduct similar to that proposed in the P450nor catalytic cycle. To investigate the effect of the axial ligand on these biomimetic reductions, we report here a comparison of the electrocatalytic