A bifunctional MnOx@PTFE catalytic membrane for efficient low temperature NOx-SCR and dust removal

doi:10.1016/j.cjche.2019.11.014

Abstract

Abstract: Low-temperature selective catalytic reduction of NO_x combined with dust removal technique due to its energy conservation characteristic has been attracted much attention for fume purification. In this work, the MnO_x wrapped PTFE membrane with efficient dust removal and low-temperature NH₃-SCR has been prepared with a facile route. MnO_x with different crystal structures was uniformly grown around the PTFE fibrils through water bath. The flower-sphere-like MnO_x@PTFE(O-MnO_x@PTFE) and lamellar-interlaced ripple-like MnO_x@PTFE(W-MnO_x@PTFE) have large specific surface area which is favorable for enhancing catalytic performance. Also, the uniformly wrapped W-MnO_x around the PTFE fibrils optimized the pore structure for ultrafine dust capture. The membrane can almost 100% reject particles that are smaller than 1.0 μm with a low filtration resistance. Meanwhile, W-MnO_x@PTFE with more surface chemisorbed oxygen has the best NO conversion efficiency of 100% at a comparatively low and wide activity temperature window of 160-210℃, which is far to the thermal limitation of the PTFE. Therefore, this efficient and energy conserving membrane has a bright application prospects for tail gas treatment compared to the original treatment process.

Key words: MnO_x, PTFE, Catalytic membrane, Low-temperature, SCR

摘要： Low-temperature selective catalytic reduction of NO_x combined with dust removal technique due to its energy conservation characteristic has been attracted much attention for fume purification. In this work, the MnO_x wrapped PTFE membrane with efficient dust removal and low-temperature NH₃-SCR has been prepared with a facile route. MnO_x with different crystal structures was uniformly grown around the PTFE fibrils through water bath. The flower-sphere-like MnO_x@PTFE(O-MnO_x@PTFE) and lamellar-interlaced ripple-like MnO_x@PTFE(W-MnO_x@PTFE) have large specific surface area which is favorable for enhancing catalytic performance. Also, the uniformly wrapped W-MnO_x around the PTFE fibrils optimized the pore structure for ultrafine dust capture. The membrane can almost 100% reject particles that are smaller than 1.0 μm with a low filtration resistance. Meanwhile, W-MnO_x@PTFE with more surface chemisorbed oxygen has the best NO conversion efficiency of 100% at a comparatively low and wide activity temperature window of 160-210℃, which is far to the thermal limitation of the PTFE. Therefore, this efficient and energy conserving membrane has a bright application prospects for tail gas treatment compared to the original treatment process.

关键词: MnO_x, PTFE, Catalytic membrane, Low-temperature, SCR

Shasha Feng, Mengdi Zhou, Feng Han, Zhaoxiang Zhong, Weihong Xing. A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1260-1267.

Shasha Feng, Mengdi Zhou, Feng Han, Zhaoxiang Zhong, Weihong Xing. A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal[J]. 中国化学工程学报, 2020, 28(5): 1260-1267.

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A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal

A bifunctional MnO_x@PTFE catalytic membrane for efficient low temperature NO_x-SCR and dust removal

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