Selective catalytic reduction of NOx, by propene over copper-exchanged pillared clays

Kim, Bo-Soo; Lee, Sanghyuk; Park, Young-Tae; Ham, Sung-Won; Chae, Ho‐Jeong; Nam, In−Sik

doi:10.1007/bf02706390

Cited by 15 publications

(7 citation statements)

References 26 publications

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“…As shown in Table and Figure , the bulk phase chemical composition of the prepared catalysts was obtained from H 2 -TPR peak-fitting. Generally, peaks located at a broad temperature range of 170–340 °C belong to the reduction of Cu(II) species and peaks at higher temperatures are assigned to the reduction of Cu + to Cu 0 . ,− Cu(II) species include [Cu(OH)] + species, isolated Cu 2+ ions, and highly dispersed CuO. The peak around 250 °C can be attributed to the reduction peak of CuO to Cu 0 . , The peak lower than 250 °C is ascribed to [Cu(OH)] + species (230 °C) and the peak higher than 250 °C to isolated Cu 2+ species (320 °C) .…”

Section: Resultsmentioning

confidence: 99%

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures

et al. 2023

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Cu-ZSM-5 zeolites exhibit promising NH3-SCR activity in a wide temperature window. The current challenges in preparing Cu-ZSM-5 are reducing the cost and simplifying the preparation process. The one-pot method using the Cu-amine complex as the template is an excellent strategy for solving the above problems. However, the above method is still lacking in preparing Cu-ZSM-5. In this work, a one-pot method using the Cu-(EDA)2 complex as the template is developed to prepare the Cu-ZSM-5-O catalyst. According to the fundamental measurements, the high dispersion of copper(II) species, appropriate acidity, and Cu+ species are in favor of the NH3-SCR reaction. Among one-pot catalysts, Cu1.8-ZSM-5-O shows excellent NH3-SCR performance at low temperatures (NO conversion of about 87.5% at 150 °C and N2 selectivity above 95% over the entire temperature window). The boosting activity at low temperatures of one-pot catalysts is probably assigned to abundant [Cu(OH)]+ species and appropriate amounts of Cu+ species in Cu-ZSM-5-O. Moreover, the variable-temperature EPR and subsequent computer simulation are used first to quantify the content of [Cu(OH)]+ species in Cu-ZSM-5-O. The NH3-SCR mechanism at low temperatures (150 °C) on [Cu(OH)]+ species is also investigated by in situ DRIFT spectra and DFT calculations, which mainly follow the Eley–Rideal route. A complete catalytic cycle of the SCR reaction was proposed based on the [Cu(OH)]+ species by DFT calculations. Our results suggest that [Cu(OH)]+ species contribute to the adsorption and activation of NH3, thus boosting the catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures

et al. 2023

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“…Only a 10% NO conversion at 240 °C was achieved with the catalyst prepared at pH-9 and the specific surface area also decreased from 159.5 to 143.1 m 2 /g. It was reported in previous studies (Kim et al, 2001;Li et al, 2011) that isolated Cu II species can be reduced to Cu 0 with H2 in two steps: Cu II to Cu I , Cu I to CuO; while CuO is reduced to Cu 0 in one step, CuO to Cu 0 . This shows that the redox behavior of Cu species plays a direct role in the reaction mechanism of NO reduction over copper catalyst and further details will be discussed in Section 3.6 (reaction mechanism).…”

Section: Pilc-based Catalystsmentioning

confidence: 91%

A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Kashif

Heynderickx

et al. 2023

Applied Clay Science

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“…Karaktristik katalis juga dipengaruhi oleh metode proparasi dan kandungan logam aktifnya. Selain itu preparasi katalis Cu yang disangga dengan silika pada reaksi dehidrogenasi etanol menunjukan bahwa semakin tinggi suhu rekasi maka aktifitas katalis semakin meningkat (Kim et al, 2001). Penelitian ini bertujuan memodifikasi zeolit sebagai katalis dengan metode refluks, sehingga menghasilkan katalis Cu-Zeolit serta mengkarakterisasi katalis tersebut.…”

Section: Pendahuluanunclassified

Modifikasi Zeolit Dengan Tembaga (Cu) Dan Uji Sifat Katalitiknya Pada Reaksi Esterifikasi

Arjek

Fatimah

2017

IJCR

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Telah dilakukan penelitian modifikasi zeolite dengan pengembanan tembaga (Cu) serta aplikasinya sebagai katalis esterifikasi. Modifikasi material dilakukan dengan impregnasi Cu melalui proses refluks serbuk zeolite dengan larutan CuSO4.5H2O sehingga konsentrasi Cu teoretis adalah 5% dilanjutkan dengan oksidasi dan reduksi padatan. Karakterisasi material dilakukan dengan analisis x-ray diffraction (XRD), Fourier Transform Infra-Red (FTIR) dan pengujian keasaman dari katalis Cu/Zeolit. Hasil penelitian menunjukkan bahwa tingkat kristalinitas dari Cu-zeolit tidak mengalami perubahan yang signifikan bila dibandingkan dengan zeolit alam. Perubahan terjadi pada intensitas dari puncak yang dihasilkan, seperti pada puncak 2θ 27,826º yang merupakan fasa mordenit pada Cu/Zeolit memiliki intensitas puncak sebesar 1360, sedangkan pada zeolit dengan puncak 2θ 27,760º dengan fasa yang sama meliki intensitas yang lebih kecil yaitu 1048. Pengujian tingkat keasaman dari katalis dilakukan dengan mengadsorbsi piridin ke dalam katalis, kemudian dihitung kadar piridin yang teradsorbsi, pada sampel zeolit kadar piridin yang teradsorbsi sebesar 0,003 g/g sedangkan pada sampel Cu/Zeolit sebesar 1,0574 g/g. Hasil analisis dengan FTIR untuk menunjukkan tingkat keasaman dilihat pada rentang bilangan gelombang antara 1450-1495 cm -1 ,dari katalis zeolit dengan bilangan gelombang 1491,17 cm -1 intensitas puncaknya (%T) sebesar 6,53, sedangkan pada Cu-zeolit dengan bilangan gelombang 1468,05 cm -1 intensitas puncaknya (%T) sebesar 10,99. Pengujian sifat katalitik katalis Cu-zeolit pada reaksi esterifikasi dilakukan dengan meraksikan asam asetat dengan konsentrasi 0,05 mol dan metanol dengan konsentrasi 0,1 mol, kemudian ditambahkan 0,2 gram katalis, kemudian dilakukan proses refluks selama 1 jam. Hasil refluks berupa metil ester kemudian dianalisis menggunakan alat kromatografi gas untuk melihat waktu retensi dan luas area yang dihasilkan. Penggunaan katalis Cu-zeolit menghasilkan ester ditunjukkan dengan munculnya puncak ester.

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Selective catalytic reduction of NOx, by propene over copper-exchanged pillared clays

Cited by 15 publications

References 26 publications

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures

A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Modifikasi Zeolit Dengan Tembaga (Cu) Dan Uji Sifat Katalitiknya Pada Reaksi Esterifikasi

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Selective catalytic reduction of NOx, by propene over copper-exchanged pillared clays

Cited by 15 publications

References 26 publications

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NOx by NH3-SCR at Low Temperatures

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NOx by NH3-SCR at Low Temperatures

A review on pillared clay-based catalysts for low-temperature selective catalytic reduction of NO with hydrocarbons

Modifikasi Zeolit Dengan Tembaga (Cu) Dan Uji Sifat Katalitiknya Pada Reaksi Esterifikasi

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Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NO_x by NH₃-SCR at Low Temperatures