Microtubular CNT-made catalytic membrane contactor is proposed for heterogeneous three-phase (i.e. solid-liquid-gas) catalytic processes aimed at hydrogenation and oxygenation of aqueous pollutants. The contactor comprises a mesoporous CNT-made microtube with an internal diameter of ≈ 1.5 mm, wall thickness of ≈ 0.2 mm, pore diameter of ≈30 nm, loaded with a nano-scale metal catalyst. In this study the concept of CNT-made contactors was proved for hydrogenation of nitrate ions. The CNT-made microtubes were fabricated by infiltration of CNT suspension through the polypropylene microfiltration membrane. The CNT-made microtubes were loaded with Pd-Cu catalysts using the wet-impregnation method followed by reduction by H₂ gas or sodium borohydride. The catalytic contactors were investigated for nitrate reduction at varied pH (5–9) and H₂ pressure (0.5–2.5 bar) in pure KNO₃ solutions and groundwater. Lower pH and higher H₂ promoted higher nitrate reduction rates but lower selectivity towards the nitrogen gas. The highest catalytic activity of 2.6 mgN/min/gPd was obtained at pH5.0 and H₂ gauge pressure of 0.5 bar. The highest selectivity (79%) towards nitrogen gas was achieved at pH7.0 and H₂ pressure of 0.1 bar. Hydrogen utilization efficiency of 93.4% (±7.6%) was obtained. Operation in groundwater resulted in lower selectivity to nitrogen than in experiments conducted on KNO₃ solutions in deionized water.

提出了微管碳纳米管制造的催化膜接触器，该催化器用于非均相的三相（固液气）催化过程，旨在对含水污染物进行加氢和氧合。接触器包括内孔CNT制造的微管，其内径约为1.5毫米，壁厚约为0.2毫米，孔径约为30纳米，并装有纳米级金属催化剂。在这项研究中，CNT制造的接触器概念被证明可用于硝酸根离子的氢化。通过使CNT悬浮液通过聚丙烯微滤膜渗透来制造由CNT制成的微管。使用湿式浸渍法，在CNT制微管中加载Pd-Cu催化剂，然后用H ₂还原气体或硼氢化钠。在纯KNO ₃溶液和地下水中，研究了催化接触器在不同pH（5-9）和H ₂压力（0.5-2.5 bar）下硝酸盐还原的情况。较低的pH值和较高的H ₂促进较高的硝酸盐还原速率，但对氮气的选择性较低。在pH5.0和0.5 bar的H ₂表压下获得了2.6 mgN / min / gPd的最高催化活性。在pH7.0和0.1 bar的H ₂压力下，对氮气的最高选择性（79％）。氢气利用率为93.4％（±7.6％）。与在KNO _3上进行的实验相比，在地下水中进行操作导致对氮的选择性更低 去离子水中的溶液。