Corrosion tests of carbon steel at six typical positions in a CO 2 capture pilot plant using amine-based solvent were conducted with simulated flue gas (12 vol % CO 2 , 18 vol % O 2 and 214 ppm SO 2 ). A weight-loss method was used to determine the corrosion rates for about 400 h of experiment. Scanning electron microscopy and energy dispersive X-ray spectroscopy were used to analyze the morphology and compositions of the coupon surface and cross section. The corrosion products on the sample's surface and cross section were analyzed with X-ray diffraction and Raman spectroscopy, respectively. Experimental and theoretical analyses show that the higher corrosion rates among these positions were present at the bottom of the absorber and rich liquid outlet of the rich-lean heat exchanger. The double-layer structure of the corrosion products with different colors was obviously observed on the cross sectional surface of the coupons at the absorber bottom and the stripper inlet. The corrosion products in the inner layer are mainly composed of hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) with traces of goethite (α-FeOOH), while the outer layer mainly consists of siderite (FeCO 3 ). The inner corrosion products, including α-Fe 2 O 3 , Fe 3 O 4 , and α-FeOOH, may come from the decomposition of FeCO 3 in the amine-H 2 O−CO 2 −O 2 −SO 2 system. An addition of SO 2 yields large amounts of hydrogen ion and dissolved oxygen which may induce a higher corrosion rate.
The
structure–property relationship of luminescent liquid
crystalline polymers (LLCPs) with AIEgens has attracted much attention.
However, the effect of the AIEgen configuration on the properties
is still unclear because of the difficulty in designing LLCPs with
a single configuration. In addition, it is expected that this effect
can be amplified through constructing the AIEgen on the backbone of
LLCPs. Herein, for the first time, we have synthesized two kinds of
main-chain polyesters with a single configuration of an AIEgen, E-PM7
and Z-PM7, via melt polycondensation. Interestingly, E-PM7 shows two
coexisting phases of rectangular columnar and smectic liquid crystalline
phases, whereas Z-PM7 exhibits no liquid crystalline properties. Moreover,
E-PM7 with AIE behavior and liquid crystalline properties can be used
to prepare fluorescent patterns printed on flexible films and glass
substrates through the photocyclization of AIE units, which endows
this kind of material with promising applications ranging from anti-counterfeiting
to information storage.
Thermo-responsive chiral nanomaterials have garnered much attention owing to their prospective applications in drug delivery, smart surface, chiroptical switches, etc. However, as the system temperature is increased, the nanostructures tend...
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