Abstract

A set of CuO–V₂O₅/TiO₂–carbon nanotubes catalysts were prepared by sol–gel method and the structural characteristics of the prepared catalyst were examined by scanning electron microscope, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area measurements, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed desorption (TPD) analyses. It was observed from the results that vanadium particles were highly dispersed on the CNTs wall and the promotional effects of CuO over V₂O₅/TiO₂–CNTs catalyst were also investigated. The positivity of the catalytic activity was attributed to the diameter of the CNTs used. Among the catalysts, V–Cu₁/Ti–C₁₀ (1 wt% Cu & 10 wt% CNTs) with CNTs having an outer diameter of 10–15 nm attained a NO_x removal efficiency of 94% at 300 °C under a gas hourly space velocity of 30,000 h⁻¹. The existence of copper species in the form of small CuO clusters and Cu²⁺ ions in the catalyst enhanced the redox properties of the catalyst. The presence of CNTs improved catalytic activity and provides better resistance to SO₂ and H₂O at the low reaction temperatures.

中文翻译：

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Cu改性V 2 O 5 / TiO 2-碳纳米管催化剂上NH 3低温选择性催化还原NO x。

摘要

溶胶-凝胶法制备了一组CuO-V ₂ O ₅ / TiO _2-碳纳米管催化剂，并用扫描电子显微镜，傅里叶变换红外光谱，Brunauer-Emmett-Teller表面积对制备的催化剂的结构特征进行了研究。测量，X射线衍射，X射线光电子能谱和程序升温解吸（TPD）分析。结果表明，钒颗粒高度分散在碳纳米管壁上，并且研究了CuO在V ₂ O ₅ / TiO ₂ -CNTs催化剂上的促进作用。催化活性的阳性归因于所用CNT的直径。在催化剂中，钒铜₁ / Ti的-C ₁₀（1重量％的Cu和10％（重量）的CNT）与具有10-15纳米的外径的CNT达到一个NO _X的30000 h的气时空速下的94％的去除效率在300℃下^-1。催化剂中小的CuO团簇和Cu ²⁺离子形式的铜物种的存在增强了催化剂的氧化还原性能。碳纳米管的存在改善了催化活性，并在低反应温度下提供了更好的抗SO ₂和H ₂ O的能力。