The
collaborative removal of dust-containing toxic gas caused by
emission of industrial fumes is an intractable problem, and catalytic
membranes that combine catalysis and separation are an effective way
to solve this problem. In this work, we exhibited the successful fabrication
of a Pt/SAPO-34@SiC catalytic membrane and its excellent catalytic
and filtration performance in the simultaneous removal of NO and particulate
matter (PM). Only 25% of the gas permeation of the SiC membrane was
sacrificed under the optimal synthesis condition, and monolayer growth
of the SAPO-34 zeolites was achieved. The simultaneous removal of
NO and PM tests showed that the highest NO oxidation rate and NO degradation
rate were 72.5 and 92.3%, respectively, while the PM rejection rate
was maintained at 99.99% during the whole test, corroborating the
simultaneous removal of NO and dust tests. The prepared Pt/SAPO-34@SiC
catalytic membrane exhibits great potential for exhaust purification.
Acid base salt solution erosion, carbonization test and freeze-thaw cycle test of cement foam concrete and phosphogypsum based foam concrete were carried out respectively. The results show that compared with cement based foam concrete, phosphogypsum based foam concrete has stronger performance of resisting acid and alkali salt attack. This is mainly due to the fact that its internal cement minerals and hydration products have less active components, and are not easy to react with acid-base salts, and have better ability to resist freeze-thaw cycles at the same time. However, the resistance to carbonation is not as good as that of cement based foam concrete. This is due to the high content of aluminum in the interior and the large volume of ettringite, which is easier to be carbonized.
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