基于PPS的锰基催化脱硝-除尘功能一体化滤料的制备及其低温SCR脱硝

Preparation of PPS filter loaded with MnO_x for dust elimination and de-NO by low-temperature SCR

采用原位生长法,将聚苯硫醚滤料（PPS）浸渍硝酸锰溶液,再逐滴加入高锰酸钾溶液,制备出基于PPS的锰基催化脱硝-除尘功能一体化滤料（Mnx/PPS催化剂）。该催化剂应用于除尘过滤器脱除烟气中NOx。以氨气为还原剂,测试了Mnx/PPS催化剂低温SCR脱硝活性,同时考察了催化温度和锰负载量对催化剂低温脱硝性能的影响,通过SEM、XRD和XPS表征对催化剂结构和性能进行分析。研究发现,在温度范围为160~220℃,Mnx/PPS催化剂具有稳定的脱硝活性（80%~90%）,而且除尘滤料广泛应用于此温度段。结果表明,基于PPS的锰基催化脱硝-除尘功能一体化滤料实现同时除尘脱硝是可行的。

PPS fibers were covered with manganese oxides by method of in-situ reaction of impregnated suppor- ted manganese nitrate and instilled potassium permanganate to obtain PPS filter loaded with MnOx for dust elimination and de-NO by low temperature SCR （Mnx/PPS catalyst） used for simultaneous catalytic removal of NOx in filter bed dust catcher from flue gases. The activity of the catalyst for SCR of NOx by NH3 was meas- ured. The influences of reaction temperature, MnOx loading were also estimated. The structures and properties of catalysts were characterized by scanning electron microscope（SEM）, X-ray diffraction（XRD） and X-ray pho toelectron spectroscopy（XPS）. Results show that the Mnx/PPS catalyst are quietly active for SCR of NO, by NH3 at temperature range of 160-220 ℃ with NO conversion achieving 80% 90%, in which dust filters are widely used. It suggests that the coupling of SCR of NOx and dust removal on a catalytic fabric dust filter （Mnx/PPS） is possible.