Hydrogen applications in selective catalytic reduction of NOx emissions from diesel engines

Reşi̇toğlu, İbrahim Aslan; Keskïn, Ali

doi:10.1016/j.ijhydene.2017.02.011

Cited by 56 publications

(22 citation statements)

References 60 publications

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“…The major imbalance, a product of the combustion of oil derivatives, occurs in the carbon dioxide cycle (CO 2 ), large quantities of which contribute to global warming (GIAKOUMIS et al, 2013). Nitrogen oxides (NO x ), sulfur (SO x ), and particulate matter (PM) emitted after combustion contribute to the formation of acid rain and the destruction of the ozone layer (KIM et al, 2017;RESITOGLU;KESKIN, 2017).…”

Section: Introductionmentioning

confidence: 99%

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Farias

Schlosser

Estrada

et al. 2019

SCA

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The growing global demand of energy, the decrease of petroleum reserves and the current of environmental contamination problems, make it imperative to study renewable energy sources for use in internal combustion engines, in order to decrease the dependence on fossil fuels and reduce emissions of pollutant gases. This study aimed to evaluate the emissions of a diesel-cycle engine of an agricultural tractor that uses diesel S500 (B5) mixed with 3, 6, 9, 12 and 15% of hydrous ethanol. It determined emissions of CO2 (ppm), NOx (ppm), and opacity (k value) of gases. A standard procedure was applied considering eight operating modes (M1, M2, M3, M4, M5, M6, M7, and M8) by breaking with an electric dynamometer in a laboratory. The experimental design was completely randomized, with 60 replicates and a 6 x 8 factorial design. Greater opacity and gas emissions were observed when the engine operated with 3% ethanol, while lower emissions occurred with 12 and 15%. With these fuels, the reduction of opacity, CO2, and NOx, in relation to diesel oil, was 24.49 and 26.53%, 4.96 and 5.15%, and 6.59 and 9.70%, respectively. In conclusion, the addition of 12 and 15% ethanol in diesel oil significantly reduces engine emissions.

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Section: Introductionmentioning

confidence: 99%

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Farias

Schlosser

Estrada

et al. 2019

SCA

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“…[1][2][3][4] In the transportation sector, diesel vehicles are one of the primary sources of NO x emissions. [5,6] Nowadays, various techniques have developed to reduce NO x emissions; these include NO x storage reduction (NSR), selective catalytic reduction (SCR), direct decomposition of NO x , and selective NO x recirculation (SNR). [7][8][9] Amongst all, NH 3 -SCR is a preferred technology for NO x reduction from medium and heavy-duty vehicles.…”

Section: Introductionmentioning

confidence: 99%

Supports materialization of Pd based catalysts for NO_x removal by hydrogen assisted selective catalytic reduction in the presence of oxygen

Patel

Sharma

2020

ChemCatChem

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The Pt and Pd based bimetallic catalyst are developed to address the NO x reduction activity. For this, a series of supports containing three different amounts of CeO 2 À MgO (9 : 1, 3 : 1, and 3 : 2) are prepared by the co-precipitation method, followed by impregnation of Pd metal precursors. The physicochemical properties of the catalytic system are investigated using various techniques such as Brunauer-Emmett-Teller (BET), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy, Transmission Electron Microscopy (TEM), Raman spectroscopy, and H 2-TPR. Among all, Pd/CeO 2 À MgO (3 : 1) gave the best NO x reduction activity. Furthermore, the effects of hydrogen concentration (0.2-0.8 vol %) on NO x reduction were tested. It was found that 0.8 vol % of H 2 shows the highest NO x conversion. Subsequently, the successive impregnation of Pt metal over Pd based catalyst enhanced the catalytic properties. The bimetallic PtÀ Pd/ CeO 2 À MgO (3 : 1) catalyst showed an 89 % NO x reduction with about 97 % N 2 selectivity in broad temperature windows (100-300°C).

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“…Consequently, it is important to find methods for NO x reduction that (i) reduce the CO 2 emissions, (ii) use green reducing agents, (iii) require lower energy costs, and (iv) involve low-cost, greener, active, selective and stable catalysts. In this regard, hydrogen has been considered to be a powerful alternative due to the fact that it is environmentally friendly and it forms H 2 O and N 2 as the major end-products [6][7][8][9]. Equation (1) represents the overall reaction for the selective formation of N 2 using H 2 as reductant.…”

Section: Introductionmentioning

confidence: 99%

“…Pd and Ir deposited on different substrates have also been proposed as active materials towards NO x H 2 -SCR with a strong dependence of the final outcome on the metallic active site-support interactions and the specific reaction conditions [12]. Other catalysts based on noble metals such as Pd and Pt have shown better results even at low operating temperatures (below 200 • C) [6]. Nevertheless, the search for affordable and inexpensive catalysts based on non-noble transition metals increased the number of studies exploring the use of copper-based alternatives for the selective reduction of NO [22].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of a Cu/SiO2 Catalyst for Efficient H2-SCR of NO

et al. 2019

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In this work, the synthesis of Cu/SiO2 catalysts starting from pre-formed copper nanoparticle (CuNP) colloidal suspensions was carried out. Two different protocols for the CuNP synthesis were tested: (i) a green approach using water as solvent and ascorbic acid as reducer and stabilizing agent, and (ii) a second solvothermal method involving the use of diethylene glycol as solvent, sodium hypophosphite (NaH2PO2) as reducer, and polyvinylpyrrolidone (PVP) and cetyltrimethylammonium bromide (CTAB) as stabilizing agents. In addition, and for the sake of comparison, a third catalyst was prepared by solid state conventional grinding of CuO with SiO2. The catalysts were tested in the environmentally relevant catalytic reduction of NOX with H2, in a temperature range from 300 to 500 °C. The catalysts were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR) cycles, Raman spectroscopy, and N2 adsorption for specific surface BET measurements. From these techniques CuO and Cu(0) species were detected depending on the synthesis protocol. CuNP size and size distribution in the colloid suspensions were determined by transmission electronic microscopy (TEM). The catalyst prepared from the aqueous suspension (CuAsc/SiO2) exhibited higher NO conversion (100%) and selectivity (85%) toward N2 at the lower reaction evaluated temperature (300 °C). The CuCTAB/SiO2 catalyst obtained by the solvothermal approach showed activity at high reaction temperature (400 °C) preferentially. The metal–support mechanical mixture exhibited a negligible response at low temperature and low conversion (68%) and selectivity (88%) at 500 °C. Nanoparticle size and distribution on the support, together with the metal–support interaction, were postulated as the most plausible parameters governing the catalytic performance of the different Cu/SiO2 materials.

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Hydrogen applications in selective catalytic reduction of NOx emissions from diesel engines

Cited by 56 publications

References 60 publications

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Supports materialization of Pd based catalysts for NO_x removal by hydrogen assisted selective catalytic reduction in the presence of oxygen

Green Synthesis of a Cu/SiO2 Catalyst for Efficient H2-SCR of NO

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Hydrogen applications in selective catalytic reduction of NOx emissions from diesel engines

Cited by 56 publications

References 60 publications

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Emissions of an agricultural engine using blends of diesel and hydrous ethanol

Supports materialization of Pd based catalysts for NOx removal by hydrogen assisted selective catalytic reduction in the presence of oxygen

Green Synthesis of a Cu/SiO2 Catalyst for Efficient H2-SCR of NO

Contact Info

Product

Resources

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Supports materialization of Pd based catalysts for NO_x removal by hydrogen assisted selective catalytic reduction in the presence of oxygen